SuperFill™ Surge Reduction Equipment - Halliburton

11-1 Casing Attachments

Casing Attachments 

Casing attachments are items attached to the casing OD as 

the casing is run in the wellbore. These items are designed to 

contribute to a successful primary cementing job. Over time, 

numerous casing attachments have been developed for use in 

primary cementing operations. These attachments can help 

the operator successfully place the casing string in the well 

and enhance mud removal from the wellbore. The type of 

primary cementing equipment used depends on individual 

well requirements and can vary widely within geographical 

areas and from field to field. Secondary cementing has 

become very expensive and casing attachments can provide 

inexpensive insurance for a perfect bond. The primary 

cementing equipment should be closely monitored to achieve 

a good primary cement job and eliminate the need for a 

secondary cementing operation. Effective proper placement 

is as important as the correct product selection. The main 

objective for using this equipment is: 

• A need to get tubulars to target depth (TD) of a 

well design. 

• Help achieve optimum circulation and zonal isolation. 

• Help reduce chances of differential sticking. 

Halliburton has supplier agreements with several top rated 

casing attachment manufacturers. To offer customers a wide 

selection of centralizer options and designs, Halliburton is 

also a distributor and supplier of the following 

manufacturer's product lines: 

• Centek 

• Antelope 

• Casewell 

• Ray Oil Tool 

• Downhole Products 

Products offered through Halliburton from these 

manufacturers provide options for all types of well designs 

from shallow land wells to the deepest offshore extendedreach 

horizontal wells. Size combinations are available on 

request and custom built; special-order items can be quoted 

as needed. Contact a local Halliburton sales representative 

for additional information. 

Casing Attachments 

This section contains information about the following casing 

attachments: 

• Centralizers: 

– Provide uniform annular clearance and reduce drag 

when running casing. 

• Stop collars: 

– Secures placement and limits travel on attachments to 

casing string. 

• Scratchers and wipers: 

– Remove mudcake on the wellbore. 

• Cement baskets: 

– Helps support cement in the annulus. 

© 2013 Halliburton. All Rights Reserved. 

Casing Attachments 11-2

Halliburton Protech CRB ® and Protech DRB ® Composite Systems 

Halliburton Protech CRB® and Protech DRB® composite 

systems consisting of a ceramic composite compound and a 

unique bonding process, licensed to Halliburton from Eni 

S.p.A.*, is a new innovative technology that can help 

significantly enhance well design versatility while 

potentially decreasing associated risks and overall project 

cost. Halliburton Protech products are currently provided 

through three facilities located in Ravenna, Italy; Aberdeen, 

Scotland; and Houston, Texas. 

Halliburton Protech CRB (Casing Resin Blend) and 

Protech DRB (Drillpipe Resin Blend) materials can be used 

for many applications: 

• Casing centralization including slim hole and deviated 

wellbore applications. 

• Drillpipe wear protection 

• Stop collars 

• Wear bands 

• Deflection wedges 

• Cutting bed cleaners 

• Screen protection devices 

• General friction reduction applications 

Halliburton Protech CRB ® Centralizers 

The Halliburton 

Protech CRB 

centralizer is solidtype 

centralizer 

mechanically 

formed and 

chemically bonded 

directly to the 

customer’s tubular 

Protech CRB® Centralizer 

pipe surface. The 

proprietary bonding process uses a composite resin 

composite material. The customer has the option to choose 

any size, shape, or location of the composite blades or 

products to their casing or drillpipe. 

HAL24955 

*Eni S.p.A. (“Eni”) is the owner of Patent Applications and Patents 

regarding the technologies of the process of centralization of CTG 

utilizing composite ceramic centralizers. Halliburton is the exclusive 

licensee world wide regarding the technologies of the 

aforementioned process. 

Features 

• Non-API rated 

• Ceramic composite material molded onto 

customer's casing. 

• Designed to fit specific well applications. 

• Can be installed on any grade of pipe, including 

CRA alloys. 

• Unique bonding process helps ensure a strong mechanical 

bond. 

• Provides centralization option for close tolerance 

wellbores. 

• Provides smooth, uninterrupted flow during circulation 

attributed to the absence of any banded product placed 

around the casing. 

• Composite material exhibits extreme abrasion and impact 

resistance. 

• Ideal for deviated sections of borehole as material 

provides a low coefficient of friction. 

• Field proven technology. 

• Material is CO 2 and H 2 S resistant. 

• A high thermal degradation temperature and excellent 

impact resistance at -25°F. 

• Composite centralizers successfully used in both 

conventional and slim profile wells. 

• Helps enable homogeneous cement slurry distribution. 

• Product applications are usually performed in a pipe yard 

where customer's pipe is stored. Field location 

installations are available. 

Process 

Protech CRB and Protech DRB centralizers are 

recommended to be applied in one of Halliburton’s 

environmentally controlled mass installation facilities, but 

can also be installed in customer's pipe yard, or on location 

if prearranged. 


Step 1—to prepare the pipe, special high-tech sand-blasting 

techniques are performed to the blade area. 

Step 6—the blade material is prepared using a precision 

blending and mixing unit. 

Step 2—sandblasting is performed to achieve a near-white 

metal finish to ensure a rough profile to allow the carbon 

fiber ceramic blend to bond to the micro peaks and valleys in 

the pipe's surface. 

Step 7—the blade material is injected into molds using a 

controlled process for a solid fill of the blade mold cavity. 

Step 3—the roughness is checked with pressure applied 

roughness test strips. 

Step 8—after installation, the blades are allowed to cure and 

final inspection for material quality control is performed. 

Step 4—the test paper is then measured for proper pipe and/ 

or profile and is correct per specification. 

Step 9—final check of OD measurements are performed 

before being ready for shipment. 

Step 5—injection molds are produced according to the 

computer-designed centralizer profile and installed with 

special double-sided, pressure-sensitive tape during 

application. 

Step 10—the final process of protective packaging devices are 

installed to prepare pipe for delivery to customers. 


Centek Centralizers 

Centralizers are manufactured in the UK (England) and in 

the USA (Oklahoma) by Centek Ltd and Centek Inc., 

respectively. Halliburton, as a non-exclusive distributor by 

agreement, yet holds exclusivity in numerous regions, sells, 

and markets, as is required. This integral one-piece bow 

spring centralizer is a high-end centralization product. The 

centralizers are built to gauge to offer easier, RIH, 

maximize standoff, and maximize the cement job. The 

UROS range of centralizers are built mostly for passing 

through close tolerance situations and then opening back 

up into under reamed holed sections, or washed out 

sections, while still providing quality stand-off 

performance. Bow spring sections are based on a straight 

bladed principle, but are curved in both axial and 

tangential directions. This cross curvature conforms to the 

borehole wall, while the axial curvature changes 

proportionally as it encounters different loads. As the loads 

increase, the surface contact area also increases, reducing 

the load per square unit of area. This helps avoid 

compression and shear failure of the formation surface. 

Centek S2 Slip-on Centralizer 

Features 

• Rating—API Specification 10D and NQA 9001-2008. 

• Design features 

– Smooth bow profile overall 

– Non-welded 

– Made to gauge 

– Integral bow design for increased strength and 

performance. 

– Zero weak points, such as hinges, welds, or 

mechanical interlocks. 

– Flexible to absorb both axial and radial loading. 

– Powder coated red finish 

• Performance 

– Zero start and running force with exceptional 

restoring force. 

– Improved flow by area and improved pipe rotation. 

– Low torque and low drag units. 

– Improved zonal isolation 

• Applications 

– Used in most well applications and geometries for 

vertical, horizontal ERD, close tolerance, or under 

reamed well conditions. 

– The UROS units are recommended where tight 

restrictions through previous set casing are 

encountered; also recommended when increased 

structural integrity is required. 

– Specialized in centralization for under reamed hole 

sections. 

• Recommended to be run between limit clamps 

• Sizes available—2 7/8 to 20 in.; custom sizes available. 

• Minimum hole size—2 7/8 in. (4 in.) hole. 

• Maximum hole size—20 in. (26 in.) hole. 

Centek Model S2 

Centralizer 

HAL24954 

Centek S2 Centralizers 

Installed between Two Centek 

Limit Clamps 


Centek UROS (Under Reamed Offset Bows) Centralizer 

The Centek UROS centralizer is designed for drag reduction 

on initial insertion and reduced accumulative loads on 

restarting and running forces during running in hole (RIH). 

The unit is designed primarily for under reamed wells. This 

design is also suitable for washed out sections where good 

centralization is still a critical requirement. The UROS 

centralizer shows significant reduction on initial insertion 

forces as well as reduced running forces through the previous 

set casing. Once through this compressed stage, the unit will 

revert to gauge, maximizing standoff with zero drag. 

• Casing sizes available—7 to 16 in. 

• Minimum hole size—9 1/2 to 20 in. 

Features 

• Rating—There is no current API standard for any under 

reamed application; however, testing of such units are to 

API Specification 10D and NQA 9001-2008. 

• Description—typical design is of a slip-on, semi-rigid, 6- 

bow centralizer, with two offset placements of three 

alternating opposite end offset bows, whereas only three 

larger nominal OD end bows enter the restriction at one 

time. Then, as the centralizer continues to enter into the 

restriction at midpoint, the other three opposing offset 

bows now enter the restriction. 

• Performance—smooth bow profile overall, non-weld 

integral bow design for increased strength and 

performance. A robust, ultra-high-strength, one-piece 

construction centralizer with no weak points, such as 

hinges or mechanical interlocks. Flexible to absorb both 

axial and radial loading. 

– Designed to easily pass through previously set casings. 

– Engineered for tight clearance/close tolerance 

applications. 

– Ideal for under reamed holes sections. 

– Offers lower starting forces when entering restrictions. 

– Gives adequate restoring force to support the casing. 

– Helps with well cleanout and circulation. 

– Reduces risk of differential sticking. 

Centek UROS Centralizer 


Centek Stop Collars 

A key element of the Centek stop collar is its high axial load 

capability. All Centek stop collars are heat treated to 

improve tensile strength, especially in the critical internal 

thread area. This is combined with high tensile set screws 

of a specific thread pitch to match the low profile 

characteristics of the product. Thus, when tightened to 35 

lb/ft, the Centek stop collars provide a vastly superior axial 

holding force when compared to other stop collars. With 

these properties and the correct make-up, the stripping of 

threads has been eliminated. 

Centek stop collar 

Applications 

• Used in all types of well designs. 

• Sizes available—2 7/8 to 20 in. (custom sizes available). 

Benefits 

• High axial load capability 

• Special use high-tensile holding force set screws. 

• Large contact surface area 

• Heat treated, eliminates internal thread stripping. 

Options 

• Available with stainless steel set screws. 

• Available in heavy-duty style with extended length and 

two rows of set screws. 

Centek heavy-duty stop collar 

(Top) Centek Stop Collar; (Bottom) Centek Heavy-duty Stop Collar 

Features 

• Rating—tested in accordance to API 

recommendations. 

• Design appearance—one-piece slip-on type with set 

screws. Non-welded design. Manufactured from highgrade, 

heat-treated steel. Centek stop collars have a 

high quality powder coated finish. 

• Performance—offers extremely high holding 

performance to Centek Centralizers. 


Antelope Oil Tools 

Antelope, with headquarters in Mineral Wells, Texas, 

currently manufactures more than 800 different material 

numbers, including products that are available to meet API 

Specification 10D. Antelope holds certification in ISO 

9001:2008 for quality management in the design and 

manufacture of casing centralizers and related accessories for 

the energy industry. Antelope is licensed by the American 

Petroleum Institute and has a “certificate of authority to use 

the official API monogram” on their API-certified products. 

Antelope Oil Tools Production Facility 

Antelope Oil Tools Production Center Aisle 

© 2013 Antelope. Photographs are the property of Antelope Oil Tools and 

used with permission by Halliburton. 

Bow Type Centralizer Classifications and 

Embodiments 

• API centralizers: 

– Meet or exceed API Specification 10D. 

– Are tested and monogrammed. 

– Meet starting-running-restoring force criteria as per 

API requirements. 

– Offer optimum performance. 

• Non-API centralizers: 

– Developed for customer preference and economics 

(less expensive). 

– Used when API specs are not required (not as rigid 

as API). 

– When hole conditions do not allow API specification 

centralizers to be run because of non-flexibility issues. 

– Wider range of size combinations. 

– Built to aid within tight restrictions of a casing string 

design. 

– Manufactured with the same structural materials and 

machinery as API centralizers. 

– Testing records are not required to be maintained. 

• Hinged centralizers: 

– Allow for easy installation around casing coupling or 

stop collar. 

– More adaptable to casing strings with upsets. 

– Have a rugged interlocking collar design. 

– Can take up less space on location or the rig floor. 

• Non-hinged centralizers (slip on): 

– Are stronger and have enhanced mechanical integrity. 

– Used in close tolerance applications. 

– Cannot be run over casing collars or pipe upsets—must 

use limit clamps or set screws. 

– Better suited for pipe rotation. 

– Shipping cost are higher because of nesting package 

limitations. 

• Set screws: 

– Used for securing and limiting travel of centralizers and 

attachments to casing. 

– Used when centralizers cannot be installed around a 

casing collar. 


– Used when casing is flush joint or non-collared. 

– Can be installed on most centralizers as an option. 

– Should only be installed on leading collar (bottom) of 

centralizer. 

– Centralizers with set screws limit the ability of the 

centralizer to be “pulled” in both directions. 

– Eliminate the use of limit clamps. 

• Turbo fins: 

– Help create added turbulence in an annulus section. 

– Can be added to most bow type centralizers. 

– Aid cement distribution around the casing. 

– Can help achieve an annular cement seal around the 

centralizer point of installation. 

Canvass Basket Assembly 

Bow Spring Centralizers 

Bow spring centralizers help center the casing in the 

wellbore during cementing operations, allowing the cement 

to be evenly distributed around the casing string. The 

degree to which the casing is centered (standoff) depends 

on the performance of the centralizer and the spacing 

between the centralizers installed on the casing OD. 

Hinged Welded Standard Bow Spring 

Centralizers 

AOT Series 500 

AOT Series 507 (with Turbo Fins) 

Features 

• Rating—non-API 

• Design appearance—hinged design with smooth 

continuous bow profile. 

• Performance—usually less restoring force than API 

and minimum starting force. 

• Applications—used in most types of well designs and 

wells with less stringent well design requirements. 

• Sizes available—2 3/8 to 30 in. 

• Minimum hole size—6 1/4 in. 

• Maximum hole size—36 in. 

Bow Type Centralizers 

© 2013 Antelope. Photographs are the property of Antelope Oil Tools 

and used with permission by Halliburton. 


Slip-On Welded Standard Bow Spring 

Centralizers 


AOT Series 511 (with set screws) 

Features 


• Design appearance—smooth continuous bow profile and 

lack of hinged collar. 

• Performance—usually less restoring force than API and 

minimum starting force. 


– Used in most types of well designs and wells with less 

stringent well design requirements. 

– When increased structural integrity is required. 

– Used in close tolerance well designs. 




Series 500 

Series 507 

Series 510 


Hinged Gravel Pack and Drillpipe Welded 


AOT Series 530—has smaller OD capability and is shorter in 

overall length. 

AOT Series 540—has larger OD capability and is longer in 

overall length. 

Features 


• Design appearance —hinged design with excessive 

pronounced bow profile. 

• Performance—usually less restoring force than API 

rated series and minimum starting force. Longer bow 

profile allows centralizers to be pulled into restrictions 

and into larger under reamed openhole. 


– Used in most types of well designs. 

– Centralizing drillpipe on stab-in type cement jobs. 

– Used in under reamed holes 

– Gravel packing operations 

• Sizes available—2 3/8 in. to 18 5/8 in. 

• Minimum hole size—8 in. 


Series 530 

Hinged Welded Standard Spiral Bow Spring 

Centralizers 

AOT Series 56X (X denotes L = LH or R = RH) 

Features 

• Rating—non-API. Some sizes meet or exceed API 

Specification 10D. 

• Design appearance—hinged design with smooth spiral 

bow profile with LH or RH deflection. 

• Performance—acceptable restoring force achieved and 



– Used in most types of well designs and wells with less 

stringent well design requirements. 

– Smooth running capabilities 

– Less susceptible to tracking key seats. 

– Recommended for minor restrictions 

• Sizes available—1/2 to 13 5/8 in. 



Series 56L 

Series 540 

Series 56R 


Slip-On Close Tolerance Welded Bow 

Spring Centralizers 


Features 


• Design appearance—smooth continuous bow profile and 

lack of hinged collar; has set screws in one end; bows are 

inset into collar to allow minimum positive OD. 

• Performance—usually less restoring force than APIrated 

series and a minimum starting force. 


– Used in close tolerance well applications. 

– Recommended where tight restrictions occur. 

– Attaches to casing with use of set screws. 

– Set screws must be installed on lower collar to allow 

centralizer to be pulled into hole. 



• Maximum hole size—17 1/2 in. 

Hinged Welded Imperial Bow Spring 

Centralizers 


AOT Series 707 (with Turbo Fins) 

AOT Series 709 (with Turbo Fins and Set Screws) 

Features 

• Rating—API spec 

• Design appearance—more aggressive bow profile on 

each end and has hinged collar. 

• Performance—usually high restoring force and a 


Series 611 Series 700 





– Recommended for deviated and directional well 

designs. 




Slip-On Welded Imperial Bow Spring 

Centralizers 


Features 



each end and lack of hinge present. 

• Performance—usually high restoring force and a 




– Recommended for deviated and directional well 

designs. 







Hinged Non-Welded Imperial Bow Spring 

Centralizers 


Features 



each end with mechanically fastened bows. 

• Performance—usually high restoring forces and 


• Applications—used in most types of well designs. 




Hinged Welded Dual Contact Bow Spring 

Centralizers 

AOT Series 780, AOT Series 780C 

(Designed and tested to run over a casing collar) 

Series 780 

Features 


• Design appearance—hinged design with a dual 

contour bow profile. 

• Performance—achieves the highest restoring forces 

and usually zero to minimum starting force. 



– Most suited for horizontal and directional well 

designs. 

Series 800 


Hinged Spiral Welded Bow Spring Tubing 

Centralizers 

AOT Series 96X (X denotes L = LH or R = RH) 

Features 


• Design appearance—apparent 

smaller pipe size with spiral bow 

with hinges not on the same hinge 

opening plane 

• Performance—acceptable 

restoring force achieved and 



– Used in most types of well 

designs, completions and, recompletions 

– Recommended for multiple pipe 

strings—use RH and LH to run 

dual strings and run RH, LH, and 

alternate third string LH-RH for 

triple string applications. 

• Sizes available—2 3/8 to 5 1/2 in. 


• Maximum hole size—8 1/2 in. for single string; custom 

combination sizes available for multi-string 

combinations 

HAL24970 

Series 96R 

Inter-Casing Centralizer 

Sub (ICCS) 

Halliburton has developed an inter-casing centralizer sub 

(ICCS) that can be run as an integral part of almost any casing 

string. Bow spring and rigid versions can be supplied in almost 

any casing size, grade, or thread and for use in the most 

challenging wellbore configurations. The three slim wedge lock 

limit clamps enable this assembly to be run into wellbores with 

small annular space. The slim wedge lock and retaining slot 

were designed using FEA. The ICCS maintains the centralizer 

performance in the openhole section required by API 

Specification 10D for bow spring centralization. The bow 

spring centralizer sub can pass through annular spaces below 

3/8 in. per side without compromising centralizer performance 

in under reamed hole sections. 

Features 

• Rating—API spec on bow type 

designs. 

• Design appearance—integral 

sub that is a part of the casing 

string; Centralizer floats 

between three slim wedge lock 

limit rings. Available with the 

following centralizer designs: 

– Straight bow 

– Spiral bow 

– Solid vane 

• Performance—provides positive 

casing standoff in open hole 

when having to pass through 

tight restrictions in previous set 

pipes. 


– Used in most types of well 

designs. 

– Suited for horizontal, 

directional, and tight 

restriction well designs. 

– Designed for use in under 

reamed hole sections. 

• Sizes available—after an engineering review, all tools are 

custom built to fit any size combination of casing thread, 

grade, and weight range. 



HAL24978 

ICCS with Spiral 

Bow Centralizer 


Isolizer Centralizer 

An AOT Custom “Built-for-Purpose” Series Centralizer with 

Protech CRB® (composite resin blend) Limit Bands 

The Isolizer centralizer is an alternative solution to 

centralizer subs for tight-tolerance applications. Unlike 

conventional centralizer subs that can only be placed 

between joints, the Isolizer centralizer provides the 

flexibility of placement at any point on the casing string. 

This design helps increase both safety and efficiency by 

eliminating the need for additional connections made on 

the rig floor. 

Features 



• Description—the Isolizer centralizer is a slip-on, tighttolerance, 

carbon-steel bow spring centralizer 

integrated with composite-resin-blend stop collars. It 

has an industry-unique design with windowed end 

rings through which composite-resin-blend blades are 

adhered to the casing with allowance for the 

compression of the bow springs. The stop collar can be 

inside the end rings to allow the Isolizer centralizer to 

rotate while being pulled in through the lead inner 

ring, reducing starting and running forces. 

• Performance—a custom built centralizer with 

outstanding holding force limiting devices. The stop 

collars are chemically bonded directly to an abraded 

surface of the casing joint with field-proven adhesionbond 

values so high that the stop collar is essentially 

integral to the casing. This design helps reduce the 

running forces by pulling the centralizer through tight 

tolerance sections, rather than pushing it through with 

the upper end ring. 

Applications 

• Designed for lean-profile drilling applications where 

centralizers are required to pass through close-/tighttolerance 

sections with powerful restoring force to 

centralize casing in under reamed hole sections. 

• Meets most deep water well construction designs and 

requirements. 

• Offers placement flexibility anywhere on the casing 

string and is not limited to placement between joints as 

with conventional centralizer subs. 

• Three models are available: 

– Rotating model—stop collars can be placed inside or 

outside the end rings. 

– Pull-in model. 

– Pull through versions. 

• Can be used in high-temperature environments greater 

than 350°F (177°C). 

Sizes available—Isolizer 

centralizers can be custom 

designed to meet unique 

well parameters. The 

Isolizer centralizer in 

combination with casingbonded 

stop collars can be 

mated to customer supplied 

casing and installed on 

casing in a pipe yard, a 

Halliburton facility, or 

certain field locations. This 

design accommodates 

casing to be run and 

wellbore OH/CH size 

Isolizer Centralizer 

parameters while reducing 

any wait time for grade or 

thread specific casing matches. 


Isolizer Centralizer Pull-in Model with 

Composite-Resin-Blend Blades Adhered 

Directly to the Casing through the Windows 

(Shown Uncompressed) 

(Shown Compressed) 

Isolizer Centralizer Pull-Through Model 

with Composite-Resin-Blend Blades 

Adhered Directly to the Casing through the 

Windows 



Isolizer Centralizer Rotating 

Model with Stop Collars Placed 

Inside the End Rings 




Proper Installation and Placement 

With proper installation and placement of casing 

attachments, minimal or no damage can be incurred upon 

them during the running pipe to bottom stages of well 

development. 


Bow spring centralizers must be placed around a limiting 

device of either a proper style stop collar or a casing collar. 

This will allow the centralizer to be pulled in either 

direction, which allows the centralizer to pass through tight 

spots and doglegs of wells without having to be pushed. 

A centralizer being pulled can reduce in OD size without 

destroying its integrity and be able to pass through a 

restriction. Pushing a bow spring type centralizer into a 

wellbore can increase its OD size if the centralizer should 

meet with restrictions or well conditions that increase the 

amount of force required to push it into the well. 

Installing Bow Spring Centralizers 

Preferred Installation 

Note how the centralizer can be pulled in either direction. This allows 

the centralizer to get smaller in OD to pass through tight spots or restrictions 

Done only when required by design 

Can increase starting and running force! 

Note how the centralizer has to be pushed in either direction. This can cause the 

centralizer to enlarge in OD and be harder to pass through tight spots or restrictions 


Proper Selection 

Proper selection is the key to successful running of casing to 

bottom during well development. 

• Need to know: 

– Any restriction conditions existing. 

– OD and ID of all pipes that will be in effect. 

– Openhole sizes that have been drilled. 

A spacing program can be run to help ensure efficient 

standoff is achieved and to help ensure proper placement of 

attachments can be obtained. 

• Spacing programs currently available: 

–Halliburton iCem® service and 

OptiCem software system. 

–Landmark WELLPLAN software. 

Casing centralization is more dependent on proper 

centralizer spacing than on the strength of individual 

centralizers. 

Centralizers in Horizontal Hole 

Casing Centralizers Hole 

HAL24977 

Minimum Standoff 

“Sag Point” 

Centralizer Spacing 

Antelope Oil Tools—Forming Operation 

Antelope Oil Tools—Stamping Operation 

© 2013 Antelope. Photographs are the property of Antelope Oil Tools and used with permission by Halliburton. 


Proper Installation of Centralizer Hinge 

Pins 

Hinged centralizers must be installed with the correct 

supplied hinge pins. The pins should be bent to a state so 

that the pin cannot be accidentally removed during 

running in the hole operations. 

• A minimal 90° is recommended. 

• 180° is more desirable for safety considerations. 

• The pin, once bent, should be pushed flush with the 

casing and hit with a hammer to help ensure the pin 

does not swivel away from the centralizer collar or 

protrude outward. 

Antelope Oil Tools—Horn Press Operation 

HAL24976 

SAP 

Part No. 

Antelope Oil Tools—Drilling/Tapping Operation 

AOT 

Part No. 

Hinge Pin Nail Selection 

Size Length, in. Series Collars and Centralizers 

424088 8310-020-0000 20 D Common 4 800 For use on non-weld centralizers 

101278927 8305-176-0600 7 ga 6 400, 500 and 700 For use on centralizers with 4-in. long end collars 

96161 8310-030-0000 30 D Common 4 1/2 400, 500 and 700 For use on centralizers with 3-in. long end collars 



Rigid Centralizers 

Rigid centralizers help positively center the casing in the 

wellbore during cementing operations, allowing the cement 

to be evenly distributed around the casing string. These 

centralizers are well-suited for horizontal and highly deviated 

wellbore designs. They work well for helping center casing in 

previous cemented casings and can be used to help align 

casings through wellheads near surface. Rigid centralizers are 

not governed by API specifications. 

Standard OD is 1/4 in. below hole size, through 17 1/2 in. 

hole. Then, 1/2 to 1 in. above 17 1/2-in. hole. 

Spiral vs. Straight Bar 

• Spiral bars have better stand off capabilities. 

• Spiral bars can enhance annular turbulence. 

• Straight bars are more prone to dig in soft formations. 

• Spiral bars are less economical. 

• Spiral direction preference. 

– If attached to casing with set screws, right-hand design 

might have tendency to embed itself into the wellbore 

with pipe rotation. 

– Left-hand spirals are more widely used. 

– Left-hand spiral helps increase turbulence when 

running in the hole if casing is rotated during lowering. 

Is it a left or right hand spiral? 

Is it a Left Hand or Right Hand Spiral? 

• Looking straight on at a centralizer, standing upright, in its running position: 

• Looking straight on at a centralizer, standing upright, in its 

• Focus running on the position bottom of the blade or bow. 

• Follow Focus it to on the the top of the blade of or the bow. blade or bow 

• Follow it to the top of the blade or bow 

• centralizer. If the top of the blade or bow shift to the right at the top of the 

blade or bow, this is a RH spiral centralizer 

• 

centralizer. 

If the top of the blade or bow shift to the left at the top of the 

blade or bow, this is a LH spiral centralizer 

• If the top of the blade or bow shift to the right at the top of the blade or bow, this is a RH spiral 

• If the top of the blade or bow shift to the left at the top of the blade or bow, this is a LH spiral 

LH 

RH 

Note: Turning Turning a spiral a spiral centralizer centralizer upside upside down does down not does change not its 

change its spiral orientation spiral orientation. 

LH 

RH 


Hinged Positive Bar Centralizers 

Hinged Positive Bar Welded 

Centralizers 


AOT Series 401 (with Set Screws) 

Features 

• Rating—not governed by API. 

• Design appearance—hinged design with positive steel 

bars welded to hinged end collars. 

• Performance—provides positive casing standoff. 




designs; favorable in cased hole situations. 

– NOT to be run around a coupling or stop collar. 

– Recommended to run between two 212-series stop 

collars or one stop collar and casing coupling. 

– On some special designs, it is possible to use a special 

limit clamp underneath this type of centralizer. 




Hinged Positive Bar Non Welded Centralizers 


Features 


• Design appearance—hinged design with positive steel 

bars mechanically attached to hinged end collars. 






– NOT to be run around a coupling or stop collar. 



– On some special designs, it is possible to use a special 

limit clamp underneath this type of centralizer. 






Slip-on Liner Band Centralizers 

Slip-on LH Spiral Band Centralizers 



• Design appearance—one solid piece design. Features 

pressed embossed flutes on a solid 5-in. tall body. 



– Used on liner jobs 

– Reduces friction when running casing attributed to 

smooth profile of flutes. 

– Most suited for horizontal and directional well designs. 

– Favorable in cased hole situations. 

– Recommended to be run between 212 stop collar(s) or 

coupling. 

– Recommend running all rigids between stop collars to 

allow centralizer to function as a bearing and to reduce 

torque. 

• Sizes available—4 1/2 to 10 3/4 in. 



• Maximum flute height—1/2 in. 

Slip-on Welded Blade Centralizers 

Slip-on Spiral Blade Centralizers 

AOT Series 46X and 47X 

46X is without Set Screws 

47X is with Set Screws 

X = L for Left Hand or R for Right Hand Spiral 

Features 

• Rating—not governed by API 

• Design appearance—one solid piece design; features 

spiral steel bars welded to solid 5-in. tall body. 

• Performance—provides positive casing standoff 



– Most suited for horizontal and directional well designs; 

favorable in cased hole situations. 





torque. 




Series 490 

HAL24948 

Series 47L 


Slip-on Straight Blade Centralizers 

AOT Series 413 and 414 

413 is without Set Screws 

414 is with Set Screws 

Features 



straight steel bars welded to solid 5-in. tall body. 









allow centralizer to function as a bearing and to 

reduce torque. 




Series 413 


Rigid Slip-on Rotating Liner Centralizers 

AOT Series 420, 422, 422C 

420 is straight blade 

422 is spiral design 

422C is spiral design with 212 limit clamp built in between end 

rings 

Features 



straight or spiral steel bars welded to solid 10-in. slip-on 

end collars. 

• Performance—provides positive casing stand off. 



– Most suited for horizontal and directional well designs; 

favorable in cased hole situations. 

– Most suited for liner band applications. 





torque. 

• Sizes available 

– 420-series—4 1/2 to 20 in. 

– 422-series—2 7/8 to 16 in. 

• Minimum/maximum hole size 

– 420-series—5 3/4 to 26 in. 

– 422-series—4 3/4 to 22 in. 

Series 420 

Series 422 

Series 422C 

Antelope Oil Tools—788 Robotic Cell 

Antelope Oil Tools—Manual Welding Process 



Limit Clamps/Stop Collars 

Stop collars and limit clamps keep centralizers and other 

casing attachments in place on the casing string and are 

available in hinged and slip-on styles for 2 3/8- through 30- 

in. casing sizes. 

In Specification 10D, Appendix B, API makes reference to 

only recommended testing procedures on stop collars. API 

does not make recommendation with regards to a 

minimum holding force value per pipe size or to the stop 

collar type. A valued point is that the stop collar should 

always have a stronger holding force than starting force. 

Consideration should be given on selection of stop collars 

regarding the type of holding device it has and the grade 

hardness of steel casing. 

Friction Style Stop Collar Clamp 


Features 



• Design appearance—hinged design that attaches to 

casing by tightening a draw bolt with Allen head 

design. 

• Performance—easy installation; provides suitable 

holding force for most applications. 



– Must have adequate annular clearance because of 

positive OD. 

– Can be used in cased and openhole environments. 

– Can be used with most hinged bow centralizers. 

– Not recommended for cement baskets and close 

tolerance applications. 


• Minimum hole size—recommended minimum 

clearance between casing and annular clearance is 

1 1/2 in. 

Hinged Set Screw Stop Collar 


Features 



• Design appearance—hinged design that attaches to 

casing by tightening set screws around the collar 

circumference. 

• Performance—easy installation; provides suitable 





positive OD. 






• Minimum hole size—recommended minimum 

clearance between casing and annular clearance is 1 1/4 

in. 

Series 200 

Series 202 


Fasgrip Stop Collar with Dogs 


Features 

• Rating—tested in accordance to API recommendations. 

• Design appearance—hinged design with case hardened 

inserts embedded in collar ID to provide maximum 

holding resistance; attaches to casing by tightening a 

draw bolt with Allen head design. 

• Performance—easy installation; provides maximum 





positive OD. 






• Minimum hole size—recommended minimum clearance 

between casing and annular clearance is 1 1/2 in. 

• Minimum hole size 

– Recommended minimum clearance between casing and 

annular clearance is 1 1/8 in. 

– Custom applications can be available to fit tighter 

clearance restrictions. 

– Available with one side beveled for passing tight 

restrictions. 

Series 204 

Slip-on Stop Collar with Set Screws 


AOT Series 222 = one side beveled 

Series 212 

Features 


• Design appearance—slip-on design that attaches to 

casing by tightening set screws around collar 

circumference. 

• Performance—easy installation with Allen wrench; 

provides suitable holding force for most applications. 


– Primarily used in close tolerance applications. 



– Can be used with most bow centralizers. 

– Can be used with most slip-on positive bar centralizers. 

– Recommended for cement baskets and close tolerance 

applications. 



Close Tolerance Press Fit Stop Collar 

(PFSC) 

AOT Series SP-21PF 

The Close Tolerance Press Fit Stop Collar (PFSC) is a new 

stop collar that addresses the need for tight clearance and 

close tolerance applications when passing casing 

attachments through severe restrictions. This new 

technology offers a unique design consisting of three slipon 

components, which, after assembly, provide outstanding 

holding force compared to conventional stop collars. 

Features 



• Description—comprises three components: (1) collet 

base with fingers (curved plates) that is axially split to 

conform to the curvature of the tubular and (2) sleeves. 

A hydraulic installation tool is required to assemble the 

components whereby the sleeves are pressed/forced on 

top of the fingers. The interference fit between the 

collet base fingers and the sleeves is engineered to 

provide optimum holding force. 

• Performance—outstanding holding force. Used when 

maximum holding forces are required. Stays in one 

piece, even when maximum holding force is exceeded. 

Applications 

• Engineered for tight clearance/close tolerance 

applications. 

• Ideal for under reamed holes sections. 

• Slim design allows for installation under SP-516 Series 

Close Tolerance Slip-on centralizer to allow for 

centralizer to be pulled in either direction. 

• Suitable for well environments up to 350°F+ 

performance. 

• Compatible with all casing grades. Ideal for CRA 

tubulars. 

• Non-marking and non-scarring. 

• Can be located anywhere on flush casing joints. 

• Allows for rotation and reciprocation. 

• Casing running operations remain conventional with 

no interruptions. 

• Minimal pipe preparation 

Collet Base 

Fingers 

Sleeve 

PFSC Series SP21PF 

PFSC Series SP21PF and 

Recommended SP-516 Close Tolerance Centralizer 


Wall Scratchers and Wipers 

Scratchers and wipers help remove excess filter cake and 

gelled mud from the wellbore whenever the pipe moves. This 

action can provide better bonding surfaces for the cement 

and helps isolate one zone from another in the cemented 

area. Scratchers and the cable loops also act as steel 

reinforcement in the cement column. Scratchers also add 

localized turbulence during cementing operations. For best 

results, install reciprocating scratchers 2 to 3 ft apart between 

stop collars. Install reciprocating cable wipers 2 to 3 ft apart 

across the cementing interval. The looped cable design on 

the wiper helps remove excess filter cake, gelled mud, and bit 

cuttings from the wellbore wall for circulation out of the hole. 

Install the wiper by latching it around the casing, and then 

torque the Allen head bolt to approximately 25 to 

35 ft-lb. The looped cable wiper will serve as reinforcement 

steel in cement columns and will help clean the wellbore. 

During mud circulation and cementing, reciprocate the 

casing enough to scratch and wipe the entire zone. 

Hinged Wire Scratcher 


Hinged Cable Type Reciprocating Wall 

Cleaner 


Features 


• Design appearance—has a hinged collar design that 

features a looped cable design. 


– Helps provide additional insurance for removal of 

excess filter cake, gelled mud, and bit cuttings from 

wellbore to be circulated from the hole. 

– Helps add more reinforcement and bonding to cement 

column. 

– Helps assist and prepare wellbore for cement job. 

• Applications—used in most types of well designs; for 

optimum results, casing string must be reciprocated. 



between casing and hole size is 1 1/2 to 5 1/2 in. 

Features 


• Design appearance—has a hinged collar design that 

features upwardly inclined woven wire cable finger 

designs. 


– Helps provide additional insurance for removal of 

excess filter cake, gelled mud, and bit cuttings from 

wellbore to be circulated from the hole. 

– Helps add more reinforcement and bonding to cement 

column. 



optimum results. casing string must be reciprocated. 



between casing and hole size is 1 1/2 to 5 1/2 in. 

HAL24972 

HAL24960 



Rotating Wipers 

Rotating wipers are available as a cable type design. Wipers 

are attached to the well casing to help remove filter cake 

and gelled mud from the wellbore whenever casing is 

rotated during cementing operations. Using today’s 

cementing software simulators, modeling results are 

showing rotation provides a better bonding environment 

for the cement and helps isolate one zone from another 

through the cemented interval. The wiper channel hugs the 

casing snugly and can be installed by welding to the casing 

or with Series 200 stop collars. 

Rotating Cable Wall Wipers 


Features 


• Design appearance—5-in. long looped cable wiper 

strip. 

• Performance—helps provide additional insurance for 

removal of excess filter cake, gelled mud, and bit 

cuttings from wellbore to be circulated from the hole. 

– Helps add more reenforcement and bonding to 

cement column. 


– Large flow areas through and between the loops 

permit filter cake to pass. 


optimum results, casing string must be rotated. 

• Sizes available—one size applicable to all well designs. 

• Minimum recommended hole size—at least 2 in. over 

pipe size. 

• Maximum effective diameter—5 1/2 in. over pipe size. 

Series 333 Rotating Cable Wiper 

Series 200 Stop Collar 


Cement Baskets 

Cement baskets are run on casing or liners above porous or 

weak formations that require protection from the hydrostatic 

pressure generated by the cement column. They can also be 

used to help support a cement column near the well surface 

while the cement sets. In stage-cementing operations, one 

basket is run on the joint just below the stage tool and 

another is run on the string above the tool. Some operators 

pump their first stage of cement above the lower basket and 

allow the cement to set while they circulate mud for the next 

stage. The bridge that is formed helps support the upper 

cement column. 

Metal Petal Cement Basket 


Features 

• Rating—not governed by API 

• Design appearance—slip-on style made of high strength, 

flexible steel bows mounted on steel slip-on end collars 

with metal petals spot welded to one end of the collar. 


– Aids in premature cement hydration to help reduce 

hydrostatic fluid column above a loss zone or weak 

formation 

– Works similar in cementing applications like a coffee 

filter does in catching particles to form a bridge in the 

annulus to prevent cement from falling back 


– Used in most types of well designs 

– May be used in cased hole and openhole applications 

– The metal petals are convex shape for added strength 

and durability and afford great adaptability to expansion 

and contraction. This type of construction allows for 

the cement basket to be rotated and reciprocated if 

necessary. Baskets are typically installed using a 212 

stop collar inside the basket. For optimum results casing 

string must be reciprocated. 

• Sizes available—2 3/8 in. to 30 in. 

• Minimum hole size—recommended maximum 

clearance between casing and hole size is 1 1/2 in. to 

2 7/8 in.; custom applications available. 

Standard Canvas Cement Basket 


Features 


• Design appearance—slip-on style made of high strength, 

flexible steel staves, mounted on a steel slip-on ring with 

heavy duty canvas liners riveted to staves fabricated of 

high strength, flexible steel bows mounted on steel slipon 

end collars with metal petals spot welded to one end 

of the collar. 


– Aids premature cement hydration to help reduce 

hydrostatic fluid column above a loss zone or weak 

formation. 

– Works similar in cementing applications like a coffee 

filter does, catching particles to form a bridge in the 

annulus to prevent cement from falling back. 



– Can be used in cased hole and openhole applications. 

– Basket should be allowed to travel on the joint of casing. 

Working casing past casing joint length will destroy the 

basket. 


• Minimum hole size—recommended maximum 

clearance between casing and hole size is 1 1/2 to 

2 7/8 in.; custom applications available. 

HAL24968 

HAL24969 



Casewell Drilling and Cementing Products 

Halliburton has used Casewell on selected projects and 

awarded tenders in the Eastern hemisphere. Casewell 

products are designed, assembled, tested, and inspected by 

its facility in India, which is equipped with modern 

machines and testing equipment, including heat treatment, 

state of art press shop, machine shop, paint shop, and are 

manufactured with rigid quality control. Quality 

management systems are fully practiced and adhered to as 

per API Specification Q1 and ISO 9001-2000. 

Casewell calculates the total load on centralizer at each 

deflection and prepares a load deflection curve using 

arithmetic average of force readings. This determines the 

restoring force specified in the API Specification10D. In 

addition to API testing, Casewell also performs the 

following test considering extreme conditions these 

products can encounter. Tensile stress testing on these 

centralizers is performed to help ensure that even a severely 

damaged centralizer will remain intact, rather than 

damaging the completion process. The compression tests 

are conducted to help ensure that even badly distorted 

centralizer bows will not fracture and leave metal 

fragments in the well. 

Offerings 

Non-welded Bow Spring Centralizer 

• Hinged non-weld bow spring centralizers. 

• Semi rigid non-weld bow spring centralizers. 

Welded Bow Spring Centralizer 

• Hinged welded bow spring centralizer. 

• Slip-on welded bow spring centralizer. 

• Rotating welded bow spring centralizer. 

The Casewell philosophy is to provide the best possible 

solution to any centralizing problem. 

Features 

• API certified products 

• Efficient management system 

• World-class infrastructure 

• High quality in production 

• Fully traceable QA/QC 

• ISO 9001, 14001, 18001 certified 

• Their strong and committed marketing, R&D, and 

operations teams continuously strive to make ever 

delivery on time. 

Slip-on, Hinged, Welded, and Non-welded Bow Spring Centralizers 


Rigid Positive Bow Centralizers 

• Hinged non-weld positive centralizer. 

• Slip-on positive welded spiralizer. 

• Heavy-duty slip-on welded spiralizer. 

Turbolizer Bow Spring Centralizers 

• Non-welded turbolizer 

• Welded turbolizer 

Solid Rigid Centralizers 

• Straight solid rigid centralizer 

• Spiral solid rigid centralizer 

Stop Collars 

• Hinged bolted stop collars. 

• Hinged spiral nail stop collars. 

• Hinged set screw stop collars. 

• Heavy-duty set screw stop collars. 

• Slip-on aluminum set screw stop collars. 

Rigid Positive Bow Centralizers 

Turbolizer and Semi Rigid Bow Spring Centralizers 

Solid Rigid Centralizers 

Stop Collars 


Ray Oil Tool Co. Cast Alloy Centralizers 

Ray Oil Tool centralizers are manufactured in Louisiana 

and Scotland by Ray Oil Tool Company Inc. in Broussard, 

Louisiana. Halliburton sells and is a provider of Ray Oil 

Tool Products. These solid blade centralizers are cast of a 

high-strength aluminum alloy, which provides high impact 

and shock resistance combined with high tensile and yield 

strength. These centralizers are also corrosion resistant. 

The solid centralizers are designed to slip easily over the 

pipe OD from the casing pin end. The centralizers should 

be installed between two stop rings or between a casing 

collar and stop ring. This method of installation allows the 

centralizer to move freely during running casing into the 

wellbore and during rotation or reciprocation of the casing 

during cementing operations. 

Solid Straight Blade Cast Alloy Centralizers 

Solid vane straight blade centralizers are designed to 

provide a fixed casing standoff, regardless of lateral load. 

This positive standoff helps ensure even distribution of 

cement around the well casing. 

HAL24992 

Solid centralizers can also be secured to the casing with set 

screws where it is not desirable to rotate or reciprocate the 

casing during cement operations. 

Features 

Straight Blade 

HAL31507 

Brand New, State-of-the-Art Drilling Rig on Construction Site in 

Oklahoma Ready for the Customer’s First Location 


• Design appearance 

– Straight, smooth cast alloy ribs cast into solid bodies 

(one-piece castings). 

– Available with and without set screws. 

– Straight ribs offer 360° evenly spaced openhole 

coverage. 


– Provide positive casing standoff 

– Limited corrosion effects with a cast alloy product. 

– Reduced electrolysis due to non-similar metals. 

– Lighter in weight than steel versions. 



– Most suited for horizontal and high directional well 


• Sizes available—4 1/2 to 20 in.; custom sizes available. 

• Actual OD—1/8 to 1 in. below stated hole size, 

depending on casing and hole size. 



• Length—8 to 30 in. 


Ray Oil Spiral Solid STAND-OFF 

Cast Alloy Centralizers 

The spiral STAND-OFF centralizer by Ray Oil is designed 

with a 360° overlapping solid vane to provide maximum 

wellbore contact and maximum wellbore fluid swirl. The 

spiral STAND-OFF centralizer is recommended to be used 

on shoe joints, through production zones, liner overlaps, and 

other areas where a good cement bond is essential. The 

recommended spacing through productive zones is every 

20 ft, using the left- and right-hand spiral design in every 

other sequence. 

Features 



– Spiral smooth cast alloy ribs cast into solid bodies 

(one-piece castings). 

– Available with and without set screws. 

– Spiral ribs offer 360° evenly spaced openhole coverage. 


– Provide positive casing standoff 

– Limited corrosion effects with a cast alloy product. 

– Reduced electrolysis because of non-similar metals. 

– Lighter in weight than steel versions. 



– Most suited for horizontal and high directional well 


• Sizes available—2 7/8 to 13 3/8 in.; custom 

sizes available. 

• Actual OD—1/8 to 1 in. below stated hole size, 

depending on casing and hole size, 



• Length—6 to 15 in. 

HAL24991 

Spiral Blade 

Ray Oil Tool Recommendations 

Aluminum straight blade vs. spiral blade 

• Straight blade advantages 

– Are the most wellbore friendly 

– Allow for self cleaning blades 

– Reduce drag while running casing 

• Spiral blade disadvantages 

– Acts as a plow scraping the wellbore. 

– Increases drag 

– Blades may clog 

– Same standoff as straight blade 

– Fluid agitation, turbulation, or swirling is recorded to 

be very short lived because pipe is never concentric 

to the wellbore. 

Ray Oil Tool Stop Rings 

The Ray Oil Tool Stop Ring design is a one-piece type that 

slips over the pin end of the pipe and secures in place with set 

screws. These stop rings have a superior holding force and 

are especially applicable in close tolerance situations. 

Features 

Stop Rings 



– One piece slip on with set screws. 

– Manufactured from high-grade tubular steel. 

• Performance—offer high performance to Ray Oil Tool 

aluminum centralizers. 


– Used in all types of well designs. 

– Sizes available—2 7/8 to 20 in. (custom sizes available). 

• Benefits 

– Flat end ring surface allows for smooth bearing surface 

to mated aluminum centralizers, allowing high 

performance during pipe rotation. 


• Options 

– Available with stainless steel set screws. 

– Available with one side beveled. 

– Available in aluminum and steel designs. 

• Aluminum vs. steel 

– Aluminum has a lower friction factor than steel. 

– Electrolysis occurs with dissimilar metals. Steel 

centralizers can cause casing electrolysis erosion. 

Aluminum is more the sacrificial metal. 

– Across production zones, aluminum has less 

perforation distortion. 

– Aluminum centralizers weigh 50% less than steel 

centralizers, which can be a transportation advantage. 

– Aluminum centralizers are manufactured by casting 

or extrusions, decreasing manufacturing time with 

constant quality assurance. 

Customer’s Mud Handling System on 

Newly Constructed Rig 


Downhole Products 

(a Varel International Energy Services Company) 

Downhole Products are specialist oilfield designers and 

manufacturers of the ultimate drag and torque reduction 

solid body zinc alloy centralizers, as widely used in the 

world’s demanding horizontal and extended-reach wells. 

Downhole Products is a British based company with 

headquarters in Aberdeen, Scotland, UK, and offices in the 

USA, Asia, and the Middle East. Downhole Products designs, 

manufactures, and supplies a wide range of casing accessories 

and completion tools. Its technologies are reinforced by 

dedicated engineering and manufacturing teams responsible 

for designing its selected range of products that Halliburton 

offers, to include the Spir-O-Lizer centralizers, Spir-O-Lizer 

Blade Runner centralizers, and their matching series of limit 

clamps. 

Downhole Products’ commitment to quality and its 

customers is to deliver the best value to customers and 

markets by finding the optimum balance of performance, 

quality, and price, which, in turn, can result in the most 

effective solution to their completion requirements. 

Features 

• Complies with pertinent ISO and OHSAS requirements. 

• BS EN ISO 9001:2000 registered company. 

• Comply with the requirements of ISO 9001:2000 in 

addition to appropriate statutory and regulatory 

requirements. 

• Ongoing in-house research and development. 

• UK facility also accommodates Downhole Products 

engineering, with the provision of a purpose-built 

precision machine shop, with availability 24/7. 

• Downhole Products uses the latest CNC machines and 

other ancillary equipment. 

Offerings 

SPIR-O-LIZER Centralizers 

Spir-o-lizer centralizers are positive stand-off wellbore 

centralizers, specifically designed for casing, liners and sand 

control screens, to eliminate costly recurring problems, 

common in today’s demanding wells. Zinc-alloy centralizer 

affording proven torque and drag reduction, designed with 

maximum flow-by, helps ensure problem-free running with 

the lowest pressure drop of any centralizer available. 

Features 

• Maximum torque and drag reduction. 

• Spiral blade design assists hole cleaning and cement 

placement. 

• Maximum flow-by with self-cleaning blade design. 

• Unique non-sparking alloy 

• Exceptional wear resistance 

• Extends casing life 

• Designed to reduce operating costs. 

SPIR-O-LIZER 


The BLADERUNNER Centralizer 

Ultimate friction reduction, Spir-o-lizer centralizer 

performs equally in open or cased holes. Maximize drag 

reduction, minimize start up torque. Cost-effective 

alternative to roller type centralizers. Based on already 

proven design used in some of the world's most demanding 

wells completed in the past. 

The ultimate friction reduction Spir-o-lizer unit reduces 

both torque and drag with patented Ultra-Low Friction 

buttons and sleeves. It performs equally in open or cased 

hole situations and is a cost-effective alternative to roller 

type centralizers. 

The BLADERUNNER Centralizer 

BLADERUNNER LD Centralizer 

Maximum drag reduction can be achieved in cased/open 

holes using the BLADERUNNER LD (low drag) zinc alloy 

Spir-o-lizer centralizer enhanced with Ultra-Low Friction 

buttons. It eliminates moving parts and break down caused 

by ingress of cuttings. 

BLADERUNNER LD Centralizer 

BLADERUNNER LT Centralizer 

The BLADERUNNER LT (low torque) zinc alloy 

Spir-o-lizer centralizer incorporating the ultra-low friction 

sleeve minimizes startup torque and offers proven low 

friction zinc alloy construction with Spir-o-lizer features 

for rotating liners and casings. 

BLADERUNNER LT Centralizer 

Features 

• Works equally well in both cased hole and open hole, 

regardless of deviation. 

• Lower drag when running through cased hole sections 

and out into open hole through milled sections. 

• Provides enhanced clean up and cement placement 

properties. 

• Lowest friction coefficient of any centralizer available 

today. 

• The Blade Runner's patented Ultra-Low Friction 

buttons perform through even the longest casing runs.

SuperFill™ Surge Reduction Equipment - Halliburton

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