FISHING TOOLS - National Oilwell Varco

16
Rotary Taper Taps
Bowen ® Rotary Taper Taps
NOV Downhole Bowen ® Rotary Taper Taps are simple, rugged,
dependable internal catch fishing tools.
Operation
Run the taper tap in the hole to the top of the stuck fish, Apply less than one
point of weight, rotate the tap until the tapered threads have engaged the
fish. Stop rotation and pull the fish from the hole.
Rotary Taper Taps are furnished in two types: Plain or Skirt type. Plain Taper
Taps do not have a skirt thread provided on the shoulder. Skirt Type Taper
Taps are threaded for a skirt. A skirt is used when the hole size is drastically
different from the fish size. The taper tap can be dressed with a skirt or a
skirt and oversize guide. This will allow for the taper tap to be guided into
the fish more easily during the fishing operation.
NOTE: All skirt type taper taps are furnished with a thread protector. This will
insure that the threads are not damaged if the taper tap is run in a fishing
operation that does not require a skirt.
All NOV Dowhole Bowen ® Rotary Taper Taps are furnished with hardened
wickers, designed to engage even the most difficult fish. The wickers are
offered in a plain, water-tight, nonfluted design, if circulation is required
below the stuck point, or a fluted type, designed to flush out the cuttings
while engaging the fish.
NOTE: Nonfluted watertight wickers are furnished standard. Fluted-type
wickers must be specified when ordered if required. Left hand wickers and
tool joint furnished on request.
Bowen ® Rotary
Taper Taps
Thread Protector
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:
B – TPF x C = Diameter A
12
Diameters A & B & Length C known:
12 x (B – A) = Taper per Foot (TPF)
C
Large Wicker O.D. = “B” Diameter — The large wicker O.D. should be at least ½” larger than your known fish inside diameter.
Small Wicker O.D. = “A” Diameter — The small wicker O.D. should be at least 1/8” smaller than your known fish inside diameter. The small wicker diameter should never be less than
a” due to depth of wickers required on the taper tap.
Length of Wickers = “C” Length — The length of the wickers can be any length up to 48” long.
NOTE: Lengths longer than 48 inches require twopiece construction. Additional charges will be required for this type of construction.
Taper per Foot = The standard taper per foot onall Bowen Taper Taps, if not specified, will be ¾” taper per foot (TPF). Never exceed 1” TPF. Tapers exceeding 1” TPF reduce the number
of wickers which can engage the fish during a fishing operation. This could cause the taper tap to fail during an attempted fishing operation.
NOTE: Tapers less than ¾” TPF are used when the diameters selected cause the taper tap to be too short.
Watercourse = All Rotary Taper Taps are furnished with a circulation hole drilled through the center, providing the small diameter is large enough to accommodate it. Taper taps that
have a small diameter less than 1” cannot have a standard circulation hole. These taper taps must be furnished with a cross-drilled circulation port above the skirt thread or above the
largest wicker diameter if not threaded for skirt.
Tong Space = “E” Length — Tong space should be at least 9” on taps that are not threaded for a skirt and 11” for a tap that will be threaded. Add 1½” of extra length per required recut
of tool joint to the tong space area.
Send for Bowen ® Technical Manual No. 2800 which includes complete descriptions of construction, operation, and parts listing for Bowen Rotary Taper Taps.
For Taper Tap skirt information send for Bowen ® Technical Manual No. 2100 on Bowen Full Circle Releasing Spears. (Skirts are interchangeable.)
Bowen ® Rotary Taper Taps
Nominal Size 5/8 3/4 1 13/16 1 7/8 1 1/4 2 3/8 2 3/8 2 3/8 2 7/8 2 7/8 3 1/2
S.R. S.R. F.J. EUE S.R. EUE EUE Reg I.F. Reg I.F. Reg
O.D. 1 1/2 1 3/4 1 13/16 1.9 2 5/16 2 3/8 3 1/16 3 1/8 3 3/8 3 3/4 4 1/8 4 1/4
Part No. 25939 14458 15247 25880 14448 25881 25882 15233 15234 19487 19488 19489
Nominal Size 3 1/2 3 1/2 3 1/2 4 4 1/2 4 1/2 4 1/2 4 1/2 5 1/2 5 1/2 5 1/2 6 3/8 6 3/8
F.H. I.F. I.F. F.H. Reg F.H. X.H. I.F. Reg F.H. I.F. Reg F.H.
O.D. 4 3/8 4 3/4 5 5 1/4 5 1/2 5 3/4 6 6 1/8 6 3/4 7 7 3/8 7 3/4 8
Part No. 19490 19491 25883 25884 19492 19493 25885 19494 15240 15241 15242 15243 15244