bowen overshot series 150 manufacturer

DLT-T type Releasing and Reversing Overshot, a new type of fishing tool, has many advantages owned by various overshot, box tap and like. It distinguishing features are as follows: to unscrew and recover the stuck fish: to release the fish down hole if necessary: to circulate the washing fluid.

LT Overshot is one of the fishing tools which is fishing the pipes externally. It can catch drill collar, drill pipe, tubing, subs and other pipes. Because of the seals, the fluid can circulate with the high pump pressure after catching the fish. The top of the fish will be milled by under mill shoe. It can also work with jars to catch the stuck fishes. If the catched fish can"t be release from stucking, we should release the overshot and lifting the drill string.

I debated on where to go next, but at the end of the day the most widely used fishing tool has to be an overshot. Some will say why not a spear? Well if you must ask, always go with the strongest fishing tool you can run to catch the fish. And if you run a spear, never plug the I.D. of your fish by breaking it off. Done with that!

The info that follows has been taken from the manuals published on overshots. I realize that paper manuals are a thing of the past, yes, yes at one time fishing tool hands carried massive catalog brief cases full of reference material. Now you have the luxury of your laptop loaded with information. If you have never sat down and read an overshot manual, now might be a good time.

The overshot is highly versatile and efficient tool. There are several different types of overshots, however each overshot is designed to engage a specific size of tubing, pipe, coupling, tool joint, drill collar or smooth OD tool.

The original overshot was developed by Bowen Oil Tools, which is now part of NOV. One thing I will point out is that in the catalogs you will see more than one assembly number for a given OD of Overshot, this came about due to the two locations developing their own variations. I found this information on NOV’s website and thought it was interesting to share.

Bowen dates back more than 105 years, when S.R. Bowen founded his first company in Coalinga, California. Shortly after the United States entered World War I, S.R. sold the Coalinga shop. He formed a second company, the S.R. Bowen Company, in 1920 in Huntington Beach.

In the early 1930s, the consequences of the stock market crash prompted S.R. Bowen to consider starting a company in Houston, where oil exploration and drilling was accelerating. In the early spring of 1934, his son Walter and a friend formed Bowen Company of Texas.

Bowen™ became a leader in innovation with the creation of the first overshot, the Series 150, in 1935. This tool set the standard for fishing equipment, and the quick acceptance of the tool assured the company partners that their business would be successful. The company continued to create new products, building a reputation for their well tool design and construction.

Currently there are several manufacturers of overshots, NOV (Bowen), Rubicon (Logan) and Applied Oil Tools (Gotco). These overshots are designated by a series number as follows:Series 10 - Sucker Rod Overshot

Overshots may be identified by one of the following, known as “type”:Full Strength (FS) - engineered to withstand all pulling, jarring and torsional strain

The basic overshot (from top down) consists of a top sub, a bowl, grapple, control, and a guide. In addition to the basic components, some overshots (Series 10 and 150) can be dressed with either a:Spiral grapple used if the fish diameter is near the maximum catch of the overshot, or a

The Series 150 Overshot features the ability to packoff on the fish. When the circulating packoff is not used, the fluid circulates down the drillpipe, aroundthe top outside of the fish, through the slip or grapple assembly, around the guide shoe and up the annulus.

When the circulating packoff is used, the annular space between the top outside of the fish and the inside of the lower part of the overshot is packed off, diverting the fluid flow down into the fish, making it easier to release and recover the fish. Packoffs usually are not high pressure devices but will often withstand sufficient pressure to establish circulation through the fish. Third party high pressure packoffs are available from various sources.

The extension can be installed between the top sub and the bowl of the Series 10, 70, and 150 overshots. It is used to extend the overshot bowl to:Allow the grapple to catch farther down on a fish that may be necked down at the top by having been pulled in two, or latched by an overshot and released several times, or to

A stop ring must be used where a fish OD reduces immediately below the catch area to allow the grapple to bite on full-size pipe.Example - catching a Hydril upset or EUE collar. If the upset of collar should pass completely through the grapple, the overshot may not be releasable.

The Series 10 Sucker Rod Overshot is designed to engage and recover sucker rods, couplings, and similar items from inside tubing strings.Basket grapples are recommended for fishing for hardened and ground boxes (Sucker Rod Box).

The Series 20 Sucker Rod Overshot is a short catch tool which provides a means for engaging the exposed portion of a fish too short to be engaged with a Series 10 overshot.Uses basket grapples only

Is different from Series 10 in that the grapple control is at the top of the bowl above the basket grapple placing the basket grapple at lowest position in the bowl.

The Series 70 Short Catch Overshot is designed to engage the exposed portion of a fish too short to engage with Series 150 overshots.Uses basket grapple only

The Series 150 Releasing and Circulating Overshot is used to engage, packoff, and retrieve twisted-off lost tubing, drillpipecoupling, tool joint, casing or other similar fish.

A right hand wicker grapple converts a normal right release overshot to left hand release. This grapple is used where you expect to apply excessive right hand torque to release a packer, safety joint, etc. Note: Overshot will have to be released by left hand rotation.

High Pressure Packoff Assemblies:The High Pressure Packoff Assembly is an accessory to the Series 150 Overshots. It is used when high pressure circulation to the fish is required. It consists of a packoff sub with packing and packing rings and is installed between the top sub and bowl of the overshot. By running the packoff sub above the bowl, this design prevents the application of high internal pressures to the overshot bowl. The design of the High Pressure Packoff Assembly allows pressures two to three times the standard overshot packoff to be applied to the fish.

This information comes directly from the NOV manual for the Wide Catch Overshot. This is probably the first and only change to this common tool I know of in my career.

The Wide Catch Overshot provides the strongest tool available to externally engage, pack-off, and pull a fish that has been significantly worn. This tool has similar rugged design features and construction as the industry standard, Bowen Series 150 overshot, with the ability to interchange the Bottom Guide with the full range of existing components used with the standard Bowen Series 150 overshot.

In service, the Wide Catch Overshot (WCOS) takes a positive grip over a large area of fish and is capable of withstanding heavy pulling, torsion, and jarring strains without damage to the tools or the fish.

The WCOS has been designed to significantly increase the catch range of the OD of the fish to be caught, compared to the standard overshot. This enables a greater opportunity for a successful fishing operation in a reduced number of trips, thus reducing overall intervention costs for the operator. In addition to the large catch range, the WCOS has the ability to seal across very large extrusion gaps at both standard and high pressure and provide full circulation through the fish, should it be required.

Connections between the Top Sub/Bowl and Extension Sub have been designed to create a seal. This will prevent the connection from washing out should the overshot be required to be flowed through for a long period of time. In order to lock the Top Sub/Extension Sub to the Bowl from backing off during operation, set screws have become standard and will gall the threads should the connection break free.

The operation of all overshots is identical. The exception being that the Series 150 carries a packoff which provides circulation through the fish. First, determine that the overshot is properly assembled and dressed with the proper size grapple. Make up the overshot on the fishing string (normally it is run connected to the bottom of the bumper sub) and run it into the well. As the top of the fish is reached make sure circulation has been established to clear overshot ID of any plugging. Lower the overshot onto the top of the fish with no rotation at first. A 5,000 pound set down weight will be sufficient to engage the grapple. While lowering the overshot over the top of the fish watch for pressure build up, shut off pumps if any pressure build up is noticed. Should any back pressure be noticed, release the back pressure to allow the grapple to engage the fish. By elevating the string it can be determined, if the grapple went over and engaged the fish. If unable to work overshot over top of fish without rotation, then slowly rotate the fishing string to the right and gradually lower the overshot over the fish. Combined rotation and lowering over top of the fish are important to keep the grapple in the release position. This provides the maximum clearance between the grapple and fish. While lowering the overshot over the top of the fish, watch for torque build up and an increase in pump pressure. A pump pressure build up indicates the overshot has gone over the top of the fish thereby reducing the flow area. Stop rotation (continued rotation could dull the wickers of the grapple) enabling the grapple to set. Allow the right hand torque to slack out of the string and then pull on the string by elevating the string to set the grapple.

To release from the fish, bump down, then simultaneously rotate to the right and slowly elevate the fishing string. It is best to have a clean fishing top before running the overshot.

Series 150 Overshots General Description ................................................. 3 Use ............................................................................ 4 Construction ............................................................. 4 Gripping and Releasing Mechanism .................... 4 Pack-off Mechanism .............................................. 5 Operation .................................................................. 6 Precautions ............................................................... 6 Undersize Parts ........................................................ 7 Spiral Parts ................................................................ 7 Basket Parts .............................................................. 7I N D E X

Overshot Accessories .............................................. 7 Subsea Sheared Pipe Retrieval Method .................. 9 Specifications and Replacement Parts .......... 12 – 19 Overshot Accessories Tables ......................... 20 – 22 Calculated Strength Tables ............................ 23 – 24 Illustrations ............... 3, 5, 7, 8, 9, 10, 17, 19, 20 – 22

Series 150 Releasing and Circulating Overshot Series 150 Releasing and Circulating Overshot Dressed with Spiral Grapple and Parts Dressed with Basket Grapple and Parts

General DescriptionThe Bowen Series 150 Releasing The Bowen Series 150 Releasing and Bowen Overshots are continually devel-and Circulating Overshot provides the Circulating Overshot has gained world- oped to new standards of strength andstrongest tool available to externally wide acceptance for fishing by means efficiency and are expertly constructedengage, pack-off, and pull a fish. The of external engagement of a fish. Each of the highest quality material.basic simplicity and rugged construction Overshot is a carefully engineered unit. Each Bowen Series 150 Releasing andwith which it is designed have made In service, it takes a positive grip over a Circulating Overshot is a compact unitit the standard of all external catch large area of fish and is therefore capa- designed to engage, pack off and pull afishing tools. ble of withstanding extremely heavy pull- specific size of tubing, pipe, coupling, ing, torsional and jarring strains without tool joint, drill collar or smooth O.D. tool. damage or distortion to either the tool Through the installation of proper under- or the fish. size parts, they may be adapted to engage and pack off any smaller size.

3Bowen course thread Overshots are Construction Three types of Basket Grapples aredesigned for easier assembly and The Bowen Series 150 Releasing and available to meet the need for catchingmaintenance. The Bowen “CT” Overshot Circulating Overshot is composed of various types of fish:has a course ACME thread on the upper three outside parts: the Top Sub, Bowl, and Guide. The Basic Overshot may be The Plain Basket Grapple is standard,end of the Bowl where the Top Sub is dressed with either of two sets of internal and will always be furnished unlessattached and at lower end where the parts, depending on whether the fish to another type is specified. It is wickeredGuide is attached. See Supplemental be caught is near maximum catch size for its entire interior length. It is used toInstruction Manual 1150A for list. for the particular overshot. catch any plain single diameter fish.The course thread allows much easier If the fish diameter is near the maximum The Basket Grapple with Long Catchfield assembly and will stand more catch of the Overshot, a Spiral Grapple, Stop has an internal shoulder located atabuse than the fine series currently Spiral Grapple Control and Type “A” the upper end, to stop the fish in bestoffered. The internal parts are completely Packer are used. If the fish is a tubing catch position. It is designed to stop andinterchangeable with existing Bowen collar, a Type “D” Collar Packoff Assem- catch an upset, or box section of a toolOvershots. bly will replace the Type “A” Packer. joint, with sufficient length left below theCross over bushings can be provided Grapple to allow the joint or upset to befrom fine thread series to course thread If the fish diameter is considerably below packed off with a Basket Mill Controlseries, allowing full use of Bowls, Top maximum catch size (usually 1¦2"), a Packer.Subs, and Guides currently in stock. Basket Grapple and a Mill Control Packer is used. The Basket Grapple with Short CatchAll sizes of Bowen Series 150 Releasing Stop has a double set of wickers, of twoand Circulating Overshot are available in Gripping and different internal diameters. It is used toFull Strength or Slim Hole Types. Despite Releasing Mechanism stop and catch a coupling with athe extremely small outside diameters The Bowl of the Overshot is designed ruptured piece of pipe engaged in itsof Full Strength Type Overshots, they with helically tapered spiral section in its upper end. The upper set of wickers willare engineered to withstand the pulling, inside diameter. The gripping member catch the ruptured pipe, and act as atorsional and jarring strains, which must (Spiral Grapple or Basket Grapple), is stop against the coupling, while thebe exerted by modern machinery, to fitted into this section. When an upward lower set of wickers will catch the coup-release and retrieve a lost fish. pull is exerted against a fish, an expan- ling. The coupling will be stopped in best sion strain is spread evenly over a long position to be packed off by the MillThe Slim Hole Type Overshots have section of the fish. No damage or distor- Control Packer.reduced outside diameters, as com- tion results to either the fish or the Over-pared to the Full Strength. They are used shot. This design permits a far stronger Grapple Controls are of two types: Spiralto perform pulling jobs in tight holes tool with a smaller outside diameter than Grapple Controls are used with Spiralwhere no other outside catch, releasing is possible with an overshot that employs Grapples; Mill Control Packers are usedfishing tool can be run. a single tapered section which supports with Basket Grapples. slips. Grapple Controls are used as a specialUseA Bowen Series 150 Releasing and A Spiral Grapple is formed as a left-hand key, to allow the Grapple to move up andCirculating Overshot is used to engage, helix with a tapered exterior to conform down during operation while simulta-pack off and retrieve twisted-off or lost with the helically tapered section in the neously transmitting full torque from thetubing, drill pipe, coupling, tool joint, Bowl. Its interior is wickered for engage- Grapple to the Bowl.casing or other similar fish. ment with the fish. Spiral Grapple Controls and Basket A Basket Grapple is an expansible cylin- Grapple Controls are plain. Mill Control der with a tapered exterior to conform to Packers include a packoff. See Pack-off the helically tapered section in the Bowl. Mechanism for a complete explanation. Its interior is wickered for engagement with the fish. In operation, the Overshot functions in the same manner, whether dressed with Spiral Grapple parts or Basket Grapple parts

4 be ordered to match each size BasketDuring the engaging operation, as the Grapple. Mill Control Packers whenOvershot is rotated to the right and used, replace a Plain Basket Control.lowered, the Grapple will expand when The Plain Basket Control is used withthe fish is engaged, allowing the fish to Type A Packer a Basket Grapple when no pack-off ofenter the Grapple. Thereafter with rota- the fish is required.tion ceased and upward pull exerted,the Grapple is contracted by the tapers Type “D” Packer assemblies are avail-in the Bowl and its deep wickers grip the Inner Seal able to pack off tubing collars in tubingfish firmly. size Series 150 Overshots. The Type “D” Packer assembly consists of a Packer,During the releasing operation, a sharp a Spring and an O-Ring. It is assembleddownward bump places the larger por- in the Bowl above the Grapple. Its uppertion of the Bowl tapers opposite the Mill Control end is sealed in a counter-bore in theGrapple smaller tapered portion, break- Packer Top Sub, by the O-Ring. In operation,ing the hold. Thereafter, when the Over- its lower end stops the collar in propershot is rotated to the right, and slowly catch position, while the integral moldedelevated, the wickers will screw the Outer Seal seal enters and packs off the collarGrapple off the fish, effecting release. threads at the top of the collar. TheseThe fact that Bowen Releasing and Cir- Type R Mill Control Packer Packers are listed on page 16.culating Overshots require right hand The Type “D” Collar Packer is designedrotation only, both during engaging and Type “A” Packer should be ordered for to be used with a Spiral Grapple, in placereleasing operation, is extremely impor- each catch size Spiral Grapple. of a Type “A” Packer, where the collartant. This feature eliminates the dangers being fished is too short to allow effectivethat are present when it is necessary to A Mill Control Packer is used when the catch and pack off length.rotate the string to the left. Overshot is dressed with a Basket Grap- ple. The Type “R” Mill Control Packer is used when a packoff is required. The unique double lip seal of the Mill Control Packer provides a positive seal of the fish. The Packer is self energized and is retained within the Mill Control by a lower second sealing lip and requires no ad- hesive for retaining the Packer. The Type Basket Grapple Basket Grapple “R” is most commonly used. It has a with Short Catch Stop with Long Catch Stop replaceable inner seal and a replaceable outer seal. The inner seal and the outerPack-off Mechanism seal may both be replaced in the fieldThe type of Pack-off used depends on when required. The Type “R” Mill Controlhow the Overshot is dressed, and the (with mill teeth) is available. Mill Controloperator’s choice. Packers are designed to remove small burrs and rough breaks only. Replace-When the Overshot is dressed with a ment inner and outer seals are listedSpiral Grapple, a Type “A” Packer is used. on page 20. Also see the special HighThe Type “A” Packer is a sleeve type. It Pressure Pack-off accessories on pageseats at its O.D. against the inside of the 19. Series 150 Overshot Type DBowl. It has an internal lip which seals with Type D Packer Packer Assemblyaround the fish. Each type “A” Packer is All Mill Control Packers are manufactured in Packed Off Positiondesigned to pack off a specific size. A to pack off a specific size. One should

5Operation To Release from the Fish 5. Likewise, once the fish is in thisFirst determine that the Overshot is Bump down; then simultaneously rotate position, the circulation will sealproperly assembled, is dressed with the to the right and slowly elevate the fishing the Packoff Rubber around the fishproper size Grapple and that all its parts string until the Overshot is clear of the and prevent fluid passage downare in good working condition. Refer to fish; combined rotating and elevating is the outside. Thus, by building upSpecifications beginning on page 11. important. pressure with the pumps, the fluid To release from a recovered fish, follow can be forced down through the fish.Obviously, if the fish is smaller than themaximum outside diameter that the the same procedure while holding the Function of the OvershotOvershot was designed to engage, fish below the Overshot. when Releasinginstall undersize parts. The sharp downward bump places the Precautions largest portion of the Bowl tapers oppo-If the hole size is so much greater than Unless an upward strain is maintained, site the Grapple and breaks the hold.the fish size that it is possible for the never rotate the fishing string to the left Right-hand rotation expands the GrappleOvershot to pass alongside the fish, while the Overshot is engaged with the and by maintaining right-hand rotation,install either a Wallhook Guide or an fish. the Overshot may be withdrawn from theOversize Guide in place of the Standard Always bump the full weight of the fishing fish.Guide. (see page 18) string before starting releasing opera-If the top of the fish is a heavily burred Function of the Grapple tions.tool joint, replace the Standard Guide The mechanical conditions which causedwith the proper Milling Guide, Type A or Always shut off the circulating pumps the Grapple to expand and contract are:C. (see page 19) before lowering the Overshot over the 1. The Grapple is a left-hand helix. fish.If the fish has an unengageable upper 2. The lower end of the Grapple isend, install an Extension between the Function of the Overshot anchored in the Overshot Bowl.Top Sub and the Bowl (see illustration on in Engaging the Fish

page 7). After the Overshot has reached the top 3. The inside diameter of the Grapple of the fish, combined rotation and is smaller than the outside diameterUsing the Top Sub, connect the Overshot lowering results in the following: of the fish.to the fishing string and run it in the hole. 1. The guide will direct the fish into the As the Overshot is rotated to the rightTo Engage and Pull the Fish Overshot. and lowered over the fish, the drag ofAs the top of the fish is reached, slowly the fish against the grapple causes the 2. The Grapple will expand and the fishrotate the fishing string to the right and Grapple to unwind and expand suffi- will pass through it.gradually lower the Overshot over the ciently to allow the fish to enter.fish; combined rotating and lowering is 3. The fish will pass through the Pack- As the Overshot is rotated to the rightimportant. off Rubber and will be halted when it and withdrawn from the fish, the drag contacts the pin end of the Top Sub.Allow the right-hand twist to slack out of of the fish against the Grapple causes In the case where an external upsetthe fishing string and then pull on the fish the Grapple to unwind and expand section is being engaged by a Bas-by elevating the fishing string. sufficiently to allow the Overshot to be ket Grapple, the fish will be halted withdrawn.If the fish does not come, turn on the by the solid steel stop in the uppercirculating pumps and maintain an end of the Basket Grapple.upward strain while circulation is forced 4. The fish is now properly located inthrough the fish. the Overshot and thereafter when upward pull is exerted, the Grapple is contracted by the tapers in the Bowl and the hold will be secure.

6Undersize Parts weakening and hazardous practice ofUndersize parts are used when the fish to welding a steel strap across the Bowl andbe caught is smaller than the maximum Sub joint to hold them in place. Usingcatch size of the Overshot. excessive torque when making-up these joints is also no longer necessarySpiral Parts if the rings are used.Undersize Spiral parts: Spiral Grapple andType “A” Packer are used to catch sizes Bowen Lock Rings provide a positive andfrom “Maximum Catch Spiral Grapple”, releasable means for locking straight-down to “Maximum Catch-Basket threaded shouldered joints so they will notGrapple,” as specified in the specifications back off.tables on pages 11 thru Type SS Top Sub Type LS Top Sub Extension Subs15 inclusive. (Short with Shoulder) (Elevator Type If a twist-off has left a fish whose upperThese Spiral Grapples and Type “A” Packer with Shoulder) end is unen-gageable, anshould be changed for each different size Extension Sub should be Top Subsfish. They will effectively catch and pack off installed between the Topworn fish as much as 3¦32" maximum Top Subs are available for Bowen Sub and the Bowl of the Overshots in two types: SS, Short Subundersize. The over-range of each grapple Overshot. This will permit with shoulder; and LS, Elevator Sub withis approximately 1¦32". lowering of the Overshot shoulder. Type SS Top Subs are furnished over the fish far enough toThere are exceptions, particularly in the as part of the assembly, unless otherwise insure en-gagement and aSlim Hole type Overshots. Some of these specified. perfect pack off in thewill effectively catch undersize or oversize Lock Rings fishing operation. Exten-fish by no more than 1¦16" maximum. Bowen Lock Rings are available as sion Subs are listed onBasket Parts optional equipment to prevent the Top Sub page 21.Undersize Basket parts are used to catch and Bowl of Bowen Series 150 Releasingsizes from “Maximum Catch-Basket and Circulating Overshots fromGrapple” as specified in the specification unthreading during backing-off opera- Extension Subtables of pages 11 thru 15 inclusive, down tions. Use of Bowen Lock Rings eliminatesto any smaller size. the weakening practice of drilling and tapping the Bowl to installBasket Grapples should be changed for a set screw for securing the Bowl to theeach size fish to be caught. Top Sub. The Rings also eliminate theMill Control Packers should be changedfor each size fish.

There are exceptions, particularly in theSlim Hole type Overshots. Some of thesewill effectively catch undersize fish by Knurlsmore than 1¦32" maximum.Overshot Accessories Lock Rings

7Construction The Breakout Clamp consists of two screw handle is then tightened whichBowen Lock Rings are used in pairs keys that fit into the Lock Ring grooves, a forces the slightly tapered keys into theconsisting of two identical rings. The lower key seat, and an extended pin flat Lock ring breakout grooves, holds therings have cam-teeth on one face, knurls link chain attached at one end to a cam-teeth together, and permits theon the other, and two breakout grooves bracket which has a guide for another shoulders to back away from the knurledon the edges. They are precision made (movable) key seat attached to a screw faces when the joint is broken. Lockfrom alloy steel, stress relieved, and heat handle. Rings are listed of page 21.treated. To position the Breakout Clamp, theAssembly screw handle is backed-up as far as itOne Lock Ring is inverted and placed on will to, the other end of the chain is putthe other so the cam-teeth intermesh through a hole in the lower key seat, andand the breakout grooves are aligned, the keys are placed in the ring groovesand then they are placed on the Top Sub. opposite each other. The chain is thenThe Bowl is threaded on, and as the joint pulled around the rings so that all slackis made-up, the knurled faces opposite is removed and the nearest pin is slippedto the cam-teeth dig in and grip the into the pin slot on the bracket. Theshoulders. The pitch on the cam-teeth isgreater than the thread pitch, so ifreverse rotation is applied, the cam-teethbegin to ride up on each other. Thisproduces a wedging action which Itcoloy Mill Extensioneffectively locks the Top Sub to the Bowl. Screw Handle BracketThe joints are properly made up when Itcoloy Mill Extension with Guidereverse torque has been applied and a Itcoloy Mill Extensions are used to millslight separation in the cam-teeth Movable Key Seat away flared or jagged metal from the topshoulders is observed. Heavy make-up of the fish so that the fish will pass easily Pintorque is not required. Slot into the Overshot Bowl. For ordinaryWhen the Overshot is dressed with a work, they are installed between the Bowlspiral grapple and type “A” Packer, a and the standard, oversize or wall hookSpacer is required between the Packer guides.and Top Sub. Please refer to Lock RingTable on page 21. The purpose of the The Itcoloy Mill Extension is also usedSpacer is to fill the space produced by in the Bowen Subsea Sheared Pipethe extra standoff of the Top Sub when Retrieval Method (see page 9). In this Keysused with the Lock Rings. No Spacer is case it is installed between the Overshotrequired when “A” Packer is not used. Bowl and the special guides. They may be ordered by giving the OvershotDisassembly number and specifying “Itcoloy MillWhen unthreading is desired, a special Extension Type” and fish size. PricesBowen Lock Ring Breakout Clamp is available on request.required. Slight right-hand torque mayhave to be applied for lining-up the Ringbreakout grooves to receive the Clamp. Lower Key Seat Chain

8 Itcoloy Mill Guide The BOP being used must have at least Itcoloy Mill Guides are used to mill two sets of rams: lower pipe rams and away jagged metal form the top of the shear rams above them. Before shear- fish so that the fish will pass easily into ing, it is necessary to land the nearest the Overshot Bowl. tool joint on the pipe rams and close them to suspend and pack off the string. They may be ordered, using the stan- The shearing then produces flattened dard Guide number, and specifying, flare-ends with protruding ears. “Itcoloy Mill Guide Type C” and fish size. When the rig returns, the string must be Subsea Sheared retrieved, the end brought to the surface Pipe Retrieval and the sheared piece removed. In the During operations from a floating rig, past, sheared pipe retrieval has been dif- there is often many hundred feet of drill- ficult, costly and time-consuming. Often ing sting string extending from the rig to large parts of the BOP stack must be the sea floor, through the wellhead blow- brought to the surface to effect retrieval. out preventer (BOP) stack, and down into the well. If occurrences like a blow- The Bowen method of sheared pipe out, a loss of anchor and the rig drifts, retrieval can be achieved in a simple, a dangerous storm is approaching, etc., time-saving and economical manner. it is sometimes necessary for the rig to It requires only two easy steps using hurriedly move from the well-site. This the Series 150 Circulating and Releasing is done by temporarily severing the drill Overshot equipped with a few special sting inside the BOP and only tripping- accessories Oversize Guide Wallhook Guide out the upper end.GuidesIf the hole size is so much greater than Blowout Preventer Stackthe fish size that it is possible for theOvershot to pass alongside the fish, anOversize Guide or a Wallhook Guidemust be installed in place of the Stan-dard Guide to insure alignment of thefish with the Overshot. These are listed Type A Mill Guideon page 18.

Twist-offs in tool joints are not alwaysimmediately revealed at the surface andas a result drilling is not halted at once.In such cases the top of the fish is usu-ally a badly burred tool joint, or drill pipe, Shear Ramsand a Type A Mill Guide must be installedon the Overshot to trim the burr off thefish so that it can enter the Overshot.Itcoloy Mill Guides perform the sameservice on undersize tool joints and arealso used when the top of the fish is an Pipe Ramsunusually jagged section of pipe. Moreinformation on these is shown on page19. Itcoloy Mill Guide

Step 1: Flare Mill-Down Step 2: Engage and Pull Bowen sheared Pipe Retrieval OvershotThe standard guide, grapple and packer After the milling step is completed, the assemblies are available for all sizes ofhave been removed from a Bowen Bowen Overshot is brought back to the drill pipe and BOPs. Prices will beOvershot and it is then dressed with a surface, dressed with a special flat- quoted on request.Mill Extension and special flat-bottom bottom Short Guide, Extension Sub andLong Guide, and installed on the drill a Basket Grapple and Mill Control Packer How to Orderstring. The Mill Extension has tapered sized to engage the joint. (The Short Specify:milling ribs of Bowen Itcoloy (sintered Guide also has a soft metal end to (1) Make and working bore sizetungsten carbide) facing on its I.D. The prevent ram damage.) The Overshot is of BOPOvershot is lowered into the BOP and lowered again and as it enters the BOP, (2) The distance between the counterover the end of the drill pipe, and then the milled-down flare-end passes lines of the BOP pipe rams androtation takes place to mill down the through the Grapple and Mill Control shear ramsflared ears of the sheared pipe. The end Packer, and is housed in the Extension (3) Drill pipe body O.D. and tool jointof the Long Guide is faced with soft Sub while the Grapple engages and O.D. and lengthmetal so that if inadvertently it contacts packs off the tool joint. A pull is exertedthe BOP pipe rams, it does not damage on the Overshot to make certain ofthem. The Guide is also of a length engagement and then the BOP pipewhich prevents the Mill Extension from rams are retracted, and the string iscontacting and damaging the tool joint in raised to the rig floor where the severedthe BOP. This is important because this joint is removed and replaced, allowingjoint O.D. is where engagement of the normal operations to resume.string will take place.

10Assembly ListsThe lists of assemblies and accessoriesin this Instruction manual have beenreduced to the most popular Overshotsand parts worldwide. This has been doneto make it easier for the customer toquickly find the information they requireand also for the ease of transmitting theelectronic version of the file.

The Bowen Series 150 Overshot productline consists of many different sizes andtypes of assemblies and items. A listof over 225 of these is in SupplementalInstruction Manual 1150A. If a locallypopular assembly is not listed in Manual1150 it will most probably be listed inManual 1150A. However, this is still nota complete list. There are additionalassemblies not listed.

The standard Series 150 Overshot is aright-hand operation tool with right-handthreads. But there are many specialsoffered. Some of the other tools madeare right-hand tools with left-handthreads, left-hand tools with left-handthreads, left-hand tools with right-handthreads, tools for H2S service, toolsfor CO2 service, tools for H2S and CO2service, very high strength tools, verythin wall tools, and with sizes rangingfrom 25/16" OD to above 32" OD.

11SpecificationsMaximum Catch Size (Spiral) 2 2-1/8 2-3/8 2-1/2 2-1/2 2-7/8 3-1/16 3-1/16 3-1/8Maximum Catch Size (Basket) 1-13/16* 1-3/4 2 2 2 2-19/32 2-11/16 2-19/32 2-5/8Overshot O.D. 2-5/16 2-21/32 3-1/8 3/3/8 3-5/8 3-5/8 3-3/4 3-15/16 3-7/8Standard Box Connection Per Customer OrderType SH SH XSH SH FS XSH SH SH SHComplete Assembly Part No. B-8919 C-10199 9305 C-4623 C-5080 9270 37585 C-5101 C-1835(Dressed with Spiral Parts) Weight 13 28 42 46 55 51 50 60 56

12SpecificationsMaximum Catch Size (Spiral) 3-1/8 3-3/8 3-1/2 3-21/32 3-21/32 3-3/4 3-3/4 4 4-1/4 4-5/8 4-5/8Maximum Catch Size (Basket) 2-5/8 2-7/8 2-7/8 3-1/8 3.220 3-7/32 3-1/4 3-1/2 3-11/16 4-1/8 4-1/8Overshot O.D. 4-1/8 3-7/8 4-3/8 4-9/16 4-11/16 4-5/8 4-11/16 4-7/8 5-9/16 5-1/2 5-5/8Standard Box Connection Per Customer OrderType FS XSH SH SH FS SH SFS SH FS SH FSComplete Assembly Part No. 9105 21300 C-4619 C-5151 9109 C-5129 9120 C-5154 5896 C-4969 5698(Dressed with Spiral Parts) Weight 70 70 72 77 83 82 83 95 130 120 130

13SpecificationsMaximum Catch Size (Spiral) 4-3/4 4-3/4 5 5 5-1/8 5-1/4 5-3/8 5-1/2 6-1/4 6-1/4 6-1/4Maximum Catch Size (Basket) 4-1/4 4-1/4 4-1/2 4-3/8 4-5/8 4-5/8 4-3/4 4-7/8 5-5/8 5-9/16 5-1/2Overshot O.D. 5-5/8 5-3/4 5-29/32 6-1/8 5-3/4 6-3/8 6-1/2 6-5/8 7-3/8 7-5/8 7-7/8Standard Box Connection Per Customer OrderType SH FS SH SFS SH SH SH SH SH SFS FSComplete Assembly Part No. C-5168 8975 C-5171 7787 C-11823 6655 4773 8625 9692 8741 C-2108(Dressed with Spiral Parts) Weight 133 138 140 157 160 176 182 185 216 241 261

14SpecificationsMaximum Catch Size (Spiral) 6-1/2 6-1/2 6-5/8 6-5/8 6-3/4 7 7-1/4 8 8-3/8 8-1/2 9Maximum Catch Size (Basket) 5-7/8 5-3/4 6 5-7/8 6-1/8 6-3/8 6-5/8 7-1/4 7-3/4 7-3/4 8-1/4Overshot O.D. 7-5/8 8-1/8 7-3/4 8-1/4 8-1/8 8-1/8 8-3/8 9-5/8 9-1/2 10-1/8 10-5/8Standard Box Connection Per Customer OrderType SH FS SH FS SH SH SH FS SH FS FSComplete Assembly Part No. 9860 C-5342 4785 C-3032 C-5222 9217 C-5354 264 4834 8960 C-5321(Dressed with Spiral Parts) Weight 220 274 235 280 243 251 260 337 314 358 401

15SpecificationsMaximum Catch Size (Spiral) 9-5/8 10-1/8 11-1/4 12 14 14-3/4Maximum Catch Size (Basket) 8-7/8 9-3/8 10-1/2 11-1/4 13-1/4 14Overshot O.D. 11-1/4 11-3/4 12-3/4 13-3/4 16 16-3/4Standard Box Connection Per Customer OrderType FS FS — — — —Complete Assembly Part No. C-12822 5329 15800 33006 68028 64553(Dressed with Spiral Parts) Weight 520 642 948 975 — —

16Bowen Type D Collar Packer Assemblies for Tubing OvershotsUse with Overshot No. 9305 C-4623 C-5080 9270 C-51010vershot Maximum Catch 2-3/8 2-1/2 2-1/2 2-7/8 3-1/16Maximum Size to Pack-off: 1.660 1.990 1.990 2-3/8 OD 2-3/8 ODTubing Collar O.D. EUE EUE EUE UPSET UPSETComplete Assembly Part No. 39380 39382 39383 39384 24046 Weight 2-5/8 2-7/8 2-7/8 3-3/16 3-5/8

Bowen Type D Collar Packer Assemblies for Tubing OvershotsUse with Overshot No. 9105 C-4619 9109 C-5151Overshot Maximum Catch 3-1/8 3-1/2 3-21/32 3-21/32Maximum Size to Pack-off 2-3/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 ODTubing Collar EUE NON EUE EUE UPSETComplete Assembly Part No. 9095 39393 6653 6653 Type D Collar Packer Assembly Weight 4-5/8 5-3/4 4-5/8 4-5/8

17Bowen Type D Collar Packer Assemblies for Tubing OvershotsUse with Overshot No. 5148 C-5129 C-4686 C-5139 C-5154 C-5142 C-5428 C-5425 9515 58960vershot Maximum Catch 3-21/32 3-3/4 3-3/4 3-7/8 4 4 4-1/8 4-1/8 4-1/4 4-1/4Maximum Size to Pack-off 2-7/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 OD 2-7/8 OD 3-1/2 OD 3-1/2 OD Tubing Collar EUE EUE EUE EUE EUE EUE EUE EUE NON NON UPSET UPSETComplete Assembly Part No. 39225 39397 39398 39399 39401 39402 39403 39404 9538 5895 Weight 4-5/8 4-3/4 7-1/4 8-1/8 8-3/8 8-3/8 7-3/8 7-3/8 5-7/8 8-1/2

Replacement PartsPacker Insert Part No. 3219-D 5538-D A-811-D A-1707-D B-5157-D B-1506-D B-4895-D 1867-D 856-D 189-D Weight 4-3/8 4-1/2 7 7-3/4 8 8 7 7 5-1/2 8Spring Part No. 6654 6654 6654 914 914 914 914 914 914 6129 Weight 1/4 1/4 1/4 3/8 3/8 3/8 3/8 3/8 3/8 1/2O-Ring Part No. 30-10 30-10 30-10 30-14 30-14 30-14 30-14 30-14 30-14 30-16 Weight 1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32

Bowen Type D Collar Packer Assemblies for Tubing OvershotsUse with Overshot No. 5162 8975 C-5165 C-4814 5737 5698 C-5168 C-4829 C-7096 C-7093 4825Overshot Maximum Catch 4-1/4 4-1/2 4-1/2 4-1/2 4-5/8 4-5/8 4-3/4 4-3/4 4-7/8 4-7/8 5Maximum Size to Pack-off 3-1/2 OD 3-1/2 OD 3-1/2 OD 3-1/2 OD 3-1/2 OD 3-1/2 OD 4 OD 4 OD 4 OD 4 OD 4 OD Tubing Collar NON EUE EUE EUE EUE EUE NON NON NON NON EUE UPSET UPSET UPSET UPSET UPSETComplete Assembly Part No. 35696 6104 B-13548 39405 39406 18661 39407 39408 39409 39410 39226 Weight 8-3/8 7-1/2 9 8 8 9 8-1/2 8-1/2 5-1/2 12-1/2 10-1/2

18Overshot Guides and Wallhook GuidesIf the hole size is so much greater than the fish size that it is possible for the Overshot to pass alongside the fish,an Oversize Guide or a Wallhook Guide must be installed to insure alignment of the fish with the Overshot.

Oversize Guides Wallhook GuidesFor Overshot Guides with Outside DiameterOver To Weight (Lbs.) Length of Guide 30" 36" 42" 48"— 4-1/2 — Over 5" to 5-1/2" O.D. Wt. Lbs. 81 94 110 —4-1/2 5 23 Over 5-1/2" to 6" O.D. Wt. Lbs. 87 102 117 —5 5-1/2 27 Over 6" to 6-1/2" O.D. Wt. Lbs. 93 110 126 —5-1/2 6 30 Over 6-1/2" to 7" O.D. Wt. Lbs. 100 117 134 — Oversize Guide6 6-1/2 34 Over 7" to 7-1/2" O.D. Wt. Lbs. 108 126 144 —6-1/2 7 49 Over 7-1/2" to 8" O.D. Wt. Lbs. 115 135 155 —7 7-1/2 65 Over 8" to 8-1/2" O.D. Wt. Lbs. 123 145 166 1887-1/2 8 75 Over 8-1/2" to 9" O.D. Wt. Lbs. 132 155 177 1988 8-1/2 85 Over 9" to 9-1/2" O.D. Wt. Lbs. — — 191 2138-1/2 9 87 Over 9-1/2" to 10" O.D. Wt. Lbs. — — 204 2289 9-1/2 90 Over 10" to 10-1/2" O.D. Wt. Lbs. — — 244 2739-1/2 10 110 Over 10-1/2" to 11" O.D. Wt. Lbs. — — 285 31810 10-1/2 131 Over 11" to 11-1/2" O.D. Wt. Lbs. — — 299 33310-1/2 11 137 Over 11-1/2" to 12" O.D. Wt. Lbs. — — 312 34811 11-1/2 143 Over 12" to 12-1/2" O.D. Wt. Lbs. —