FISHING TOOLS - National Oilwell Varco

Rotary Die Collars
Bowen ® Rotary Die Collars
Die Collars are simple, rugged, dependable external catch fishing
tools.
Operation
Run the Die Collar in the hole to the top of the stuck fish. Apply less
than one point of weight and rotate the die collar until the tapered
threads have engaged the fish. Stop rotation and pull the fish from
the hole.
Die Collars are furnished in two types: Type “A” and Type “B.” Type
“A” Die Collars have a smooth end on the large diameter end, the
guide is integral with the die collar.
NOTE: Type “A” Die Collars also available with cut lip design.
Type “B” Die Collars have a threaded end on the large wicker
diameter end so that an optional guide can be used to better adapt
the die collar to changing hole conditions. Optional guides are
furnished with plain or cut lip designs. All Die Collars are furnished
with hardened wickers, designed to engage even the most difficult
fish. The standard wickers offered are a plain, watertight, non-fluted
design, if circulation is required below the stuck point. An optional
flutedtype wicker is also available, designed to flush out the cuttings
while engaging the fish.
NOTE: No additional charge for fluted wickers.
Left-hand wickers and tool joint furnished
on request.
Type B Die Collar
with Lipped Guide
Large Wicker I.D. = “B” Diameter — The large wicker I.D. should be at least ½” larger than your known fish outside diameter.
FISHING TOOLS
Type A Die Collar
Diameters A & B & Length C known:
12 x (B – A) = Taper per Foot (TPF)
C
Diameters A & B known:
12 x (B – A) = Length C
TPF
Diameter A & Length C known:
TPF x C + A = Diameter B
12
Diameter B & Length C known:
Oversize Guide
B – TPF x C = Diameter A
12
Small Wicker I.D. = “A” Diameter — The small wicker I.D. should be at least ½” smaller than your known fish outside diameter. The small wicker diameter should never be less than
1½” due to the boring and wickering operation during the manufacturing process.
Length of Wickers = “C” Length — The length of the wickers can be any length up to 24” long.
NOTE: Lengths longer than 24 inches require two-piece construction. Additional charges will be required for this type of construction.
Wall Thickness = “D” — Thickness at guide end of taper tap should never be less than ¼”.
Taper per Foot (TPF) = The standard taper per foot on all Die Collars, if not specified, will be ¾” TPF. Never exceed 1” taper per foot. Tapers exceeding 1” TPF reduce the number of
wickers which can engage the fish during a fishing operation.
NOTE: Tapers less than ¾” TPF are used when the diameters selected cause the die collar to be too short.
Watercourse = All Rotary Die Collars are furnished with a circulation hole drilled through the center, providing the ordered connection was designed with a watercourse.
Tong Space = “E” Length — Tong space should be at least 9” on die collars. Add 1½” of extra length per required recut of tool joint to the tong space area.
Bowen ® Die Collars
Nominal Size 3/4 1 1 1 1/4 2 3/8 2 3/8 2 3/8 2 3/8 2 7/8 2 7/8 2 7/8 2 7/8 3 1/2 3 1/2 3 1/2 3 1/2 3 1/2
Pipe Pipe Upset Pipe Pipe Upset API Reg API I.F. Pipe Upset API Reg API I.F. Pipe Upset API Reg API F.H. API I.F.
O.D. 1.660 11 3/16 1 29/32 2 5/16 3 7/16 3 11/16 4 3/16 4 7/16 4 4 3/8 4 7/8 5 1/4 4 3/4 5 1/16 5 1/2 5 7/8 6
Nominal Size 4 1/2 4 1/2 4 1/2 4 1/2 4 1/2 5 9/16 5 9/16 5 9/16 5 9/16 5 9/16 6 5/8 6 5/8 6 5/8 6 5/8 6 5/8 6 3/8 6 5/8
Pipe Upset API Reg API F.H. API I.F. Pipe Upset API Reg API F.H. API I.F. Pipe Upset API Reg API F.H. API I.F. API Reg API Reg
O.D. 5 7/8 6 3/8 6 7/8 7 1/8 7 1/2 7 1/16 7 9/16 8 1/4 8 1/2 8 7/8 8 1/8 8 5/8 9 1/4 91/2 10 10 3/4 13 5/8
15