bowen series 150 overshot factory

There are several other overshots available, but the Series 150 Bowen Overshot is the most popular and used throughout the world. Bowen also manufactures several other overshots that are very similar to the Series 150. We will discuss these later.

The Series 150 Bowen Overshot features positive engagement, and is a releasable overshot. It never requires left-hand rotation during it operation. It sets and releases using right-hand rotation and is releasable at any time during operation, should the need arise.

The Series 150 Bowen Overshot is available in many sizes and five different strengths. The five different strengths are designated by the following letters:

The Series 150 Bowen Overshot is used to engage, pack off, and retrieve twisted off or lost tubing, drill pipe, casing, tool joint, coupling, or other similar fish.

The Series 150 Bowen Overshot is considered a simple tool. It is, as far as the construction is concerned. It is made of three parts: the top sub, the bowl, and the guide. There are a multitude of accessories that can change the whole complexion of the overshot for many different circumstances.

The large spiral threads inside the overshot bowl are to accommodate the spiral threads on the outside of the grapple. They enable you to insert the grapple in the overshot. They also create a cone-like wedge that draws the grapple down when the overshot is picked up. The more you pickup, the harder the grapple will grip the fish. This cone-like wedge is referred to as the draw and these threads should always be cleaned and well lubricated before putting a grapple in the overshot. This will reduce friction and enable the grapple to pull farther down into the draw. It works very much like slips in a rotary.

Grapples for all Bowen overshots have a minimum catch range above and below the designated catch size. Check Bowen manual #5/1150 for these catch ranges.

All grapples for a give size overshot have the same part number. For example: the spiral grapple and the basket grapple for a 5 ¾” O.D. overshot assembly #8975 is 6112. You should familiarize yourself with these numbers and use them when ordering grapples.

There are two types of grapples for the Series 150 overshot; a spiral grapple and a basket grapple. The spiral grapple catch size begins where the basket grapple catch size becomes too thin to have any strength. The spiral grapple’s maximum size is also the maximum catch size of the overshot. You cannot get spiral and basket grapples in the same catch size.

The Grapple is locked in place by a control, which goes in the overshot below the grapple. There are four kinds of controls: a spiral grapple control (all spiral grapple controls are the same size), a plain control (also all the same size), control packoff, and mill control packoffs. The latter two come in sizes to correspond with the grapple you run. Both have a rubber packoff in them. The mill control packoff has milling teeth on the bottom to help get over a burred fish.

There are five different packoffs for the Series 150 Bowen Overshot. They are as follows: Mill control packoff and plain control packoff, as mentioned above. The type “A” packoff is used with a spiral grapple. The type “A” packoff goes in the top of the overshot bowl above the grapple and packs off around the outside of the fish. They also come in sizes to correspond with the grapple size. The type “D” packoff goes in the top of the overshot bowl above the grapple. It packs off in the inside of the fish in a collar or integral joint box and is limited to the sizes you can get it. The packoffs mentioned above are not dependable. So do not ever assure the customer that they will hold a specific amount of pressure. The only one that is dependable is the High Pressure Packoff. It has four elements that fit in a high-pressure packoff bowl. The high pressure bowl screws onto the overshot at the bottom where the guide normally goes, and the guide screws onto the bottom of it. The high-pressure packoff is available in nominal pipe sizes only, such as 2 3/8”, 2 7/8”, 3 ½”, etc. However, if you need to, and have a machine shop available, it is very easy to convert control packoffs to high-pressure packoff elements.

There are several different types of basket grapples for the Series 150 Bowen Overshot. The threads inside the grapple are called Wickers. The wickers are spiraled like threads. This helps to screw off of a fish when releasing the overshot. You can get basket grapples with different size wickers. If you are catching a fish that is soft, then a deep, wide wicker is best. If the fish is of a very hard substance, then a fine wicker is best. There is a left-hand wicker used when extreme right-hand torque is put in the pipe below the overshot. There is an N.I.T or Nitroloy grapple that is very hard steel and should be used when catching a fish of very hard steel, like P-105 tubing. It is available in nominal sizes only. There are basket grapples with stops built in. They prevent the grapple from getting below a collar, an upset, integral joint or a shoulder of any kind. It is almost impossible to release the overshot if you get below an upset or collar or a shoulder of any kind. These grapples with stops cannot be used to go over a nipple that is above a collar or upset. The I.D. of the stop is not large enough to allow the grapple to close enough to catch the collar or upset. There is another type of stop available, called a steel stop. It is a donut shaped steel ring that fits in the top of the overshot bowl, where you put the type “A” and type “D” packoffs. It is available in most any I.D. needed if there is a machine shop available.

Other accessories for the Series 150 Bowen Overshot are Mill guides, Oversize guides, Bowl or Top extensions, Bottom extensions, and Crossover Bushings.

The Mill guide is used to mill over a fish that is distorted in some way (such as flat, flared, or split) and to bring it back to the original size before engaging it with a grapple. A bottom extension should be run between the overshot bowl and the mill guide to insure enough room to get over the fish without rotating the grapple over the fish. Another use for the bottom extension is to help line up a crooked fish with the overshot before it reaches the grapple.

The oversize guide is used when an overshot is not compatible with the hole size. For example: If you run a 5 ¾” overshot in 7” casing, the casing is approximately 6 ¼” I.D. Therefore, you would not have room to go by a fish or encounter trouble getting over the fish, but if you run a 5 ¾” overshot inside a 8 5/8” casing, (which is approximately 7 ½” I.D.), you would bypass a fish or have difficulty lining it up to go in the guide. So here you would run a 7” or 7 ¼” O.D. oversize guide. Another use for the oversize guide is where you are fishing for a small diameter fish in a large diameter hole, and cannot get a grapple with small enough catch for an overshot that is suitable for the hole size. You would run a smaller O.D. overshot that grapples were available for and an oversize guide that is compatible to the hole size.

The top extension should not be a larger I.D. than the maximum catch size of a basket grapple for the same size overshot. If it is, it has been modified and the yield strength is less than the book lists it. The crossover bushings are from the overshot threads to comparable sized washpipe on top of the overshot bowl as an extension when you need to cover a full joint of tubing and catch the collar. In a case like this, you would use a washpipe top bushing to eliminate one bushing. You would also use a steel stop in the overshot bowl. Another use for the crossover bushing is on the bottom of the overshot bowl to run a long extension, such as a long rotary shoe to line the fish up with the overshot before engaging the grapple.

Always check the I.D. of the top sub of the overshot to be sure it is not the same as the O.D. of the fish. If it is, you could get a friction bite when the fish goes in it and make it very difficult to release the overshot.

To release the overshot, you have to move the grapple up in the bowl so the grapple can open. You do this by jarring down on the work string. This is referred to as shucking the overshot. When you think you have done this, you pick up on the work string to a neutral weight and rotate the overshot to the right five or six rounds. Then pick up again and continue this way until the overshot is clear of the fish. If it will not rotate, then try again to shuck it. If you pick up too much weight after shucking it, it will not rotate.

When you have a fish in the rotary, it is sometimes hard to shuck the overshot. Here are some ways that work real well. If you still have your jar assembly on the overshot, close the bumper jars, then tie the cat line above the Mandrel. Pick up until the jars are opened, then drop them closed very rapidly. If you don’t have jars, latch a set of elevators around the same way. You should never have to force an overshot over a fish. In fact, most of the time, you will not get any indication that the grapple is over the fish.

It is not necessary to put the rotary tongs on an overshot guide to tighten it. A 36-inch pipe wrench booked on the lip and hit two or three times with a sledgehammer is sufficient. Some overshots are pinned at the top. Top extensions are also pinned to insure against backing off when left-hand torque is applied to the overshot.

The connections above the bowl should be tightened with rotary tongs, and then the pins tightened. Always use caution when tightening these connections. They are fine threads; therefore, easy to pull the threads or mash the overshot bowl.

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. — — 327 36611-1/2 12 159 Over 12-1/2" to 13" O.D. Wt. Lbs. — — 343 38312 12-1/2 175 Over 13" to 13-1/2" O.D. Wt. Lbs. — — 360 40212-1/2 13 183 Over 13-1/2" to 14" O.D. Wt. Lbs. — — 377 42113 13-1/2 190 Over 14" to 14-1/2" O.D. Wt. Lbs. — — 391 43613-1/2 14 197 Over 14-1/2" to 15" O.D. Wt. Lbs. — — 404 45114 14-1/2 205 Over 15" to 15-1/2" O.D. Wt. Lbs. — — 419 46714-1/2 15 223 Over 15-1/2" to 16" O.D. Wt. Lbs. — — 433 48315 15-1/2 242 Over 16" to 16-1/2" O.D. Wt. Lbs. — — 448 50015-1/2 16 250 Over 16-1/2" to 17" O.D. Wt. Lbs. — — 462