Transcription
FISHING TOOLS
NOV Downhole is the largest independent downhole tool and equipment provider in theworld. We have the expertise to optimize BHA selection and performance, supporting over 150locations in more than 80 countries.Our complete range of solutions for the bottom hole assembly and related equipment includes: Drill BitsDrilling MotorsBorehole EnlargementDrilling Tools and ProductsCoring ServicesFishing ToolsIntervention and Completion ToolsService EquipmentAdvanced Drilling SolutionsWe take pride in delivering superior performance and reliability. Our objective is to exceed ourcustomers’ expectations, improve their economics and be an integral part of their strategies.2
FISHING TOOLSTable of ContentsIntervention, Retrieval and RecoveryIntervention, Retrieval and Recovery .Page 4Jar IntensifiersBowen Jar Intensifier Tools. Page 30Series 150 OvershotsBowen Series 150 Releasing and Circulating Overshots .Pages 5 - 10Super II Intensifier ToolsBowen Super II Intensifier Tools. Page 31Overshot AccessoriesBowen Itcoloy Mill Extensions . Page 11Bowen Itcoloy Mill Guides . Page 11Bowen Oversize Guides and Wall Hook Guides . Page 11Jar Placement ProgramJar Placement Program . Page 32Impression Blocks and Extension SubsBowen Impression Blocks . Page 12Bowen Extension Subs . Page 12Series 10 Sucker Rod OvershotsBowen Series 10 Sucker Rod Overshots . Page 13Series 20 OvershotsBowen Series 20 Short Catch Sucker Rod Overshots . Page 14Series 70 OvershotsBowen Series 70 Short Catch Releasing Overshots . Page 15Surface Bumper JarsBowen Surface Bumper Jars . Page 33Junk BasketsBowen-Itco Junk Baskets . Page 34Bowen Reverse Circulation Junk Baskets . Page 35Bowen Full-Flow Reverse Circulation Junk Baskets . Page 36Junk SubsBowen Junk Subs . Page 37Fishing MagnetsBowen Fishing Magnets . Page 38Rotary Die CollarsBowen Rotary Die Collars . Page 16Itcoloy Milling ToolsBowen Itcoloy Milling Tools . Page 39Bowen Pilot Mills . Page 39Rotary Taper TapsBowen Rotary Taper Taps . Page 17Rotary ShoesBowen Rotary Shoes Hard-Faced with Itcoloy . Page 40Itco-Type Releasing SpearsBowen Itco-Type Releasing Spears . Page 18ItcoloyBowen Itcoloy . Page 41Tinning Rod and Brazing Flux . Page 41Segment-Type Spear GrapplesType F Stop Subs . Page 19Bowen Segment-Type Spear Grapples . Page 19Full-Circle Releasing SpearsBowen Full-Circle Releasing Spears . Page 20Simplex Packer RetrieversBowen Simplex Packer Retrievers . Page 21Smooth Bore Packer RetrieversBowen Smooth Bore Packer Retrievers . Page 22Safety JointsBowen Coarse Thread Safety Joints . Page 23Fishing Bumper SubsBowen Fishing Bumper Subs . Page 24Lubricated Fishing Bumper SubsBowen Lubricated Fishing Bumper Subs . Page 25Balanced Bumper SubsBowen Balanced Bumper Subs . Page 26Type Z Oil JarsBowen Type Z Oil Jars . Page 27Super Fishing JarsBowen Super Fishing Jars . Page 28Super II Fishing JarsBowen Super II Fishing Jars . Page 29Ditch Magnets / Magnet ChargersBowen Ditch Magnets . Page 42Bowen Magnet Chargers . Page 42Hydraulic External CuttersBowen Hydraulic External Cutters . Page 43Internal CuttersBowen Internal Cutters . Page 44Bowen Collar Finders . Page 44Internal Pressure Pipe CuttersBowen Internal Pressure Pipe Cutters . Page 45External CuttersBowen External Tubing and Drill Pipe Cutters . Page 46Tubing and Casing PatchesBowen Packer-Type Tubing and Casing Patches . Page 47Bowen Lead Seal Tubing and Casing Patches . Page 47Casing PatchesBowen Lead Seal Cementing Casing Patches . Page 48Bowen Underwater Wellhead Casing Patches . Page 48Bowen High Pressure Casing Patches . Page 49Casing ScrapersBowen Casing Scrapers . Page 50Downhole SolutionsNOV Downhole Offerings . Page 513
Intervention, Retrieval, and RecoveryNOV Downhole is the manufacturer of Bowen Fishing Tools, the world’s most respected and reliable fishing tool products in the oil and gasindustry for over 85 years. Fishing Tools are utilized in two types of operations.1. Well Intervention – the operation of servicing an under-performing well in order to increase its production2. Fishing – the operation of recovering an object that is stuck, damaged, or lost in the wellboreNOV Downhole provides a vast range of fishing tools that have become industry standards. The comprehensive list of products includescatch tools, fishing stroking tools such as jars, intensifiers, and bumper subs, junk retrieval tools, milling and cutting tools, as well as repairand remedial tools. We lead the industry in terms of the size and diversity of our fleet and our ability to provide and service tools at a globallevel.Each fishing tool is engineered to perform a specific operation. Since several fishing tools are utilized to make a fishing bottom holeassembly, each tool enhances the performance of the others to provide the most effective solution for all types of well intervention and fishingoperations.NOV Downhole’s Bowen Line of Fishing Tools: External catch fishing tools Internal catch fishing tools Junk retrieval fishing tools Milling and cutting tools Accessory tools Repair and remedial toolsNOV Downhole offers a computer-based Fishing Jar Placement Program that determines the optimum jar placement in the fishing string tomaximize the energy of the jarring impact and impulse. This successful, field-proven placement program compensates for the effects of holeangle, hole curvature, and frictional drag making it applicable for straight, directional, and horizontal hole analysis.Fishing ToolsExternal CatchMilling and CuttingRemedial and RepairFishing tools that engage the fish on itsouter diameter. These tools help you recoverequipment downhole by using a grapple or bythreading directly to its outside surface.Fishing tools used to mill or cut objectsdownhole for a specific reason. Whether youare milling up a fish that could not be retrievedto surface, cutting casing or tubing in anintervention operation, or performing a washingover procedure, NOV Downhole has the toolsfor the job.Scrapers are used to clean the casing’s insidewall, rollers restore the the inner diameterof casing and tubing to their normal insidediameter and roundness, and patches form apermanent sealed connection between twostrings of tubing or casing.Internal CatchFishing tools that engage the fish in its innerdiameter. Similar to External Catch Tools, this isachieved by a grapple or by threading directlyto the fish’s inside surface.Junk CatchFishing tools used to remove debris, also knownas “junk”, from the wellbore. Magnets and junkbaskets are ideal when retrieving a fish that isbroken into pieces or has an irregular shape.4Engineering ServicesAccessory ToolsNOV Downhole offers a variety of tools thatenhance the fishing operation. Bumpersubs provide you that extra movement in thedrillstring when finding the top of the fish,fishing jars create the impact and impulse forceto free the stuck fish, and our intensifiers are runin conjunction with the fishing jar to increasethe jarring impact.NOV Downhole provides customized solutionsto your specific application. When a special toolis required, our experienced engineering staffis available to evaluate your application andprovide a specific and reliable solution.
FISHING TOOLSSeries 150 OvershotsBowen Series 150 Releasing and Circulating OvershotsThe NOV Downhole Bowen Series 150 Releasing and Circulating Overshot is thestrongest tool available to externally engage, pack-off, and pull a fish. The basic simplicityand rugged construction with which it is designed have made it the standard of all externalcatch fishing tools.ConstructionThe Bowen Series 150 Releasing and Circulating Overshot is composed of three outsideparts: the Top Sub, Bowl, and Guide. The Basic Overshot may be dressed with either of twosets of internal parts, depending on whether the fish to be caught is near maximum size forthe particular overshot.If the fish diameter is near the maximum catch of the Overshot, a Spiral Grapple, SpiralGrapple Control, and Type “A” Packer are used. If the fish diameter is considerably belowmaximum catch size (usually ½”) a Basket Grapple and a Mill Control Packer are used.BowlBowlBasketGrappleInner SealMill ControlPackerOuter SealBasket GrappleBasket Grapple withLong Catch StopGuideBowen Series 150 Releasing and CirculatingOvershot with Basket GrappleInner SealGripping and Releasing MechanismThe Bowl of the Overshot is designed with helically tapered spiral section on its inside diameter. The grippingmember (Spiral Grapple or Basket Grapple), is fitted into this section. When an upward pull is exerted against afish, an expansion strain is spread evenly over a long section of the bowl and the compression strain is spreadevenly over a long section of the fish. No damage or distortion occurs to either the fish or the Overshot. Thisdesign permits a far stronger tool with a smaller outside diameter than is possible with an overshot that employsa single tapered section which supports slips.A Spiral Grapple is formed as a left-hand helix with a tapered exterior to conform with the helically taperedsection in the Bowl. Its interior is wickered for engagement with the fish.A Basket Grapple is an expandable cylinder with a tapered exterior to conform to the helically tapered section inthe Bowl. Its interior is wickered for engagement with the fish. Two types of Basket Grapple are available to meetthe need for catching various types of fish.Basket Grapple Mill ControlPackerThe Basket Grapple with Long Catch Stop has an internal shoulder located at the upper end, to stop the fish inthe best catch position. It is designed to stop and catch collars and tool joints, with sufficient length left below theGrapple to allow the joint to be packed-off with a Basket Control Packer. The Basket Grapple with Short CatchStop (not shown) has a double set of wickers of two different internal diameters. It is used to stop and catch acoupling with a ruptured piece of pipe engaged in its upper end. The upper set of wickers will catch the rupturedpipe and act as a stop against the coupling, while the lower set of wickers will catch the coupling.Grapple Controls are of two types: Spiral Grapple Controls are used with Spiral Grapples; Basket Controls areused with Basket Grapples. Grapple Controls are used as a special key to allow the Grapple to move up anddown during operation while simultaneously transmitting full torque from the Grapple to the Bowl.Outer SealSpiral Grapple Controls are always plain; Basket Grapple Controls may be either plain or include a Packoff.In addition to the Packoff, mill teeth are included. See Packoff Mechanism in this catalog for a completeexplanation.5
Series 150 OvershotsIn operation, the Overshot functions in the same manner, whetherdressed with Spiral Grapple parts or Basket Grapple parts.During the engaging operation, as the Overshot is rotated tothe right and lowered, the Grapple will expand when the fish isengaged, allowing the fish to enter the Grapple. Thereafter, withrotation stopped and upward pull exerted, the Grapple is contactedby the tapers in the Bowl and its deep wickers grip the fish firmly.During the releasing operation, a sharp downward bump places thelarger portion of the Bowl tapers opposite the Grapple, breakingthe hold. Thereafter, when the Overshot is rotated to the right andslowly elevated, the wickers will unscrew the Grapple off the fish.The fact that Bowen Releasing and Circulating Overshots requireright-hand rotation only, both during engaging and releasingoperation, is extremely important. This feature eliminates thedangers that are present when it is necessary to rotate the string ina left-hand direction.Pack-Off MechanismThe type of Pack-off used depends on how the Overshot is dressedand the operators’ choice. When the Overshot is dressed with aSpiral Grapple, a Type “A” Packer is used. It seals at its O.D. againstthe inside of the Bowl. It has an internal lip that seals around thefish. Each Type “A” Packer is designed to packoff a specific size. AType “A” Packer should be ordered for each size Spiral Grapple.Control Packers are used when the Overshot is dressed with aBasket Grapple. Control Packers are standard with a Type “R”(Replaceable) Packer. The patented Double Lip Packer providesgreater sealing ability and reduces the chance of seal damageduring fish engagement. The outer seal is also replaceable; thisallows for field replacement of either seal. The Mill Control Packer isused when light dressing is required prior to fish engagement.NOTE: Only one control can be installed in the overshot assembly at a time.Control Packers are manufactured for a specific size. One should be orderedto match each basket grapple size that has been ordered.Plain Controls are used when no packoff is required. They areinstalled in the same location as the Control Packer.NOTE: The tables on the following pages list all available controls. Refer tothose tables for the proper part number.Top SubPackerType A PackerBowlReleasing From the FishDrop the weight of the fishing string heavily against the Overshot,then simultaneously rotate to the right and slowly elevate thefishing string until the Overshot is clear of the fish. To release from arecovered fish, follow the same procedure while holding fish belowthe Overshot.SpiralGrappleGrappleControlSpiral GrappleGuideBowen Series 150 Releasingand Circulating Overshotwith Spiral Grapple6Operation: Engaging and Pulling the FishConnect the Overshot to the fishing string and run it in the hole. Asthe top of the fish is reached, slowly rotate the fishing string to theright and gradually lower the Overshot over the fish. Allow the righthand torque to slack out of the fishing string, and pull on the fishby elevating the fishing string. If the fish does not come, start thecirculating pumps and maintain a heavy upward strain while fluid isforced through the fish.Overshot AccessoriesThe more commonly used accessories for Bowen Series 150Overshots are Extension Subs, Oversize Guides, Wall Hook Guides,Milling Shoes, and Lock Rings. These accessories are illustratedand listed beginning on page 10. Calculated strength data on allBowen Series 150 Overshots are available on request.Send for Bowen Technical Manual No. 1150 which includes complete descriptionsof construction, operation, maintenance, and parts listing for Bowen Series 150Releasing and Circulating Overshots.Spiral Grapple Control
FISHING TOOLSTools are listed in order of maximum catch size.The following table shows only a partial listing of available NOV Dowhole Bowen overshots.NOTE: Nitralloy Grapples are available upon request.Bowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 28” to 3w” InclusiveMaximum Catch Size (Spiral)282822222d3z38Maximum Catch Size (Basket)1w222222b2sOvershot F.S.Complete AssemblyPart No.C-101999305C-4623C-50809270C-51019105(Dressed Spiral Parts)Weight28424655516070Replacement PartsTop SubPart No.A-102009311A-5083A-50819276A-51029106BowlPart No.B-102019306B-5088B-50829271B-51039107PackerPart No.B-102029309B-5089B-33958550B-3594809Spiral GrapplePart No.B-102049307B-5091B-50859272B-35961741Spiral Grapple ControlPart No.A-102059308A-5092A-50869273B-35971747Standard GuidePart No.A-102069312A-5093A-50879275A-35981746Basket PartsBasket GrapplePart No.B-102049307B-5091B-50859272B-35961741Basket Grapple ControlPart No.A-102059308A-5092A-50869273B-35971747Mill Control PackerPart 9-RBowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 32” to 4” InclusiveMaximum Catch Size (Spiral)323D3D3w4Maximum Catch Size (Basket)2d”383.2203R32Overshot O.D.4a4b4n4s4dTypeS.H.S.H.S.F.S.S.H.S.H.Complete AssemblyPart No.C-4619C-51519109C-5129C-5154(Dressed Spiral Parts)Weight7277838295Replacement PartsTop SubPart No.A-4620A-51529110A-5130A-5155BowlPart No.B-4621B-51539111B-5131B-5156PackerPart No.L-7065L-66656665B-5538B-5157Spiral GrapplePart No.B-3607B-43396662B-5133B-5159Spiral Grapple ControlPart No.B-3608B-43406674A-5134B-5160Standard GuidePart No.A-4622A-43416667A-5135A-5161Basket PartsBasket GrapplePart No.Basket Grapple ControlPart No.Mill Control PackerPart 06674A-5134B-5160L-6665-R6665-RB-5538-RB-5157-RFS (Full Strength) . . . . . . . . . Engineered to withstand all pulling, torsional and jarring strain.XFS (Extra Full Strength) . . . Engineered for extreme abuse.SFS (Semi Full Strength) . . . Engineered for special hole conditions and maximum strength.SH (Slim Hole) . . . . . . . . . . . Engineered to withstand heavy pulling strains only.XSH (Extra Slim Hole). . . . . . Engineered for pick up jobs only.7
Series 150 OvershotsTools are listed in order of maximum catch size.The following table shows only a partial listing of available NOV Dowhole Bowen overshots.NOTE: Nitralloy Grapples are available upon request.Bowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 44” to 52” InclusiveMaximum Catch Size (Spiral)444s4w4w55Maximum Catch Size (Basket)3n48444444444dOvershot S.H.Complete AssemblyPart No.58965698C-51688975C-5171C-48258625(Dressed Spiral Parts)Weight130130133138140192185Replacement PartsTop SubPart No.58975699A-51698976A-5172B-48268626BowlPart t No.1691140B-21996114L-5950L-4505Spiral GrapplePart No.1651135B-22016112B-4369M-10718619Spiral Grapple ControlPart No.1861137B-22026113B-4370M-10728620Standard GuidePart No.1871143B-22036121B-4371L-10748621Basket PartsBasket GrapplePart No.1651135B-22016112B-4369M-10718619Basket Grapple ControlPart No.1861137B-22026113B-4370M-10728620Mill Control PackerPart 6sBowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 64” to 6s” InclusiveMaximum Catch Size (Spiral)6464646262Maximum Catch Size (Basket)5s5b525d5w6Overshot O.D.7a7s7d7s887wS.H.S.F.S.F.S.S.H.F.S.S.H.Complete AssemblyTypePart No.96928741C-21089860C-53424785(Dressed Spiral Parts)Weight216241261220274235Replacement PartsTop SubPart No.96938742B-21069861A-53439133BowlPart No.96941641B-21099862B-37119134PackerPart No.96891642L-1680986523729136Spiral GrapplePart No.96871644B-20739863B-23749137Spiral Grapple ControlPart No.96881645A-20749864B-23759138Standard GuidePart No.96915525A-20759867A-237691399137Basket Parts8Basket GrapplePart No.96871644B-20739863B-2374Basket Grapple ControlPart No.96881645A-20749864B-23759138Mill Control PackerPart No.9689-R1642-RL-1680-R9865-RL-6635-R9136-R
FISHING TOOLSTools are listed in order of maximum catch size.The following table shows only a partial listing of available NOV Dowhole Bowen overshots.NOTE: Nitralloy Grapples are available upon request.Bowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 6s” to 74” InclusiveMaximum Catch Size (Spiral)6s64774Maximum Catch Size (Basket)5d686a6sOvershot O.D.847d888aTypeF.S.S.H.S.H.S.H.Complete AssemblyPart No.C-3032C-52229217C-5354(Dressed Spiral Parts)Weight280243251260Replacement PartsTop SubPart No.A-3033A-52239218A-5355BowlPart No.B-3034B-52249219B-5356PackerPart No.A-1814B-52259224B-5357Spiral GrapplePart No.N-84B-52279222B-5359Spiral Grapple ControlPart No.M-89A-52289223B-5360Standard GuidePart No.A-1818A-52299226A-5361B-5359Basket PartsBasket GrapplePart No.N-84B-52279222Basket Grapple ControlPart No.M-89A-52289223B-5360Mill Control PackerPart No.A-1814-RB-5225-R9224-RB-5357-RBowen Series 150 Releasing and Circulation OvershotsMaximum Catch Size 8” to 14w” InclusiveMaximum Catch Size (Spiral)88a8299s10811¼1214Maximum Catch Size (Basket)747w7w848d9a10211413414Overshot O.D. .F.S.F.S.F.S.F.S.F.S.---Complete AssemblyPart (Dressed Spiral Parts)Weight3373143584014804294897511001200Top SubPart 4BowlPart 5PackerPart 6Spiral GrapplePart 8Spiral Grapple ControlPart 9Standard GuidePart 0Basket GrapplePart 8Basket Grapple ControlPart 9Mill Control PackerPart 330116803164556Replacement PartsBasket PartsRECOMMENDED SPARE PARTS:(1) Spiral — 3 packers, 2 grapples, for each size and 1 control(2) Basket — 2 grapples, 2 controls or mill control packers for each size(3) Mill Control Packer — 3 inner and 3 outer seals9
Series 150 OvershotsInner SealBowen Inner SealsFish SizeInner SealFish SizeInner SealFish SizeInner SealFish SizeInner SealFish SizeInner SealFish SizeInner SealFish SizeInner SealFish SizeInner SealPart No.WeightPart No.WeightPart No.WeightPart No.WeightPart No.WeightPart No.WeightPart No.WeightPart zz4wA-10827zBowen Inner Seals to Pass Upset and Pack-Off PipePack-Off Pipe SizePass Upset SizeInner SealPart No.Pack-Off Pipe SizePass Upset SizeInner SealPart 42z2.330A-13285425A-11695RECOMMENDED SPARE PARTS: (1) 3 Inner SealsOuter SealBowen Type R Replaceable Outer Seals for Control PackersPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPacker No.Outer SealPart No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part No.Part 0O-ring seals are normally furnished in sealed plastic bags of 10, 25, or 100 pieces each to prevent deterioration.Other quantities will be furnished in unsealed packages. Packing sets will always be furnished in sealed plastic 202R30-51742330-17-
FISHING TOOLSOvershot AccessoriesBowen Itcoloy Mill ExtensionsOvershot Mill Extension interiors are faced with ltcoloy to a size that will mill away a flared or jagged fish to enable it to pass up into and beengaged by the Grapple in the Bowl. Mill Extensions are installed between the Bowl and the standard, oversize or wallhook guides.Bowen Itcoloy Mill GuidesOvershot Itcoloy Mill Guide interiors are faced with ltcoloy to a size that will mill away a flared or jagged fish to enable it to pass up into andbe engaged by the Grapple in the Bowl. The Itcoloy Mill Guide is used in place of a standard or oversized Guide. They may be ordered usingthe Standard Guide number. Specify O.D. to be milled over and state, “Itcoloy Mill Guide.”Bowen Oversize Guides and Wall Hook 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.Itcoloy Mill ExtensionsItcoloy Mill GuidesBowen Oversize GuidesBowen Wall Hook GuidesGuide O.D.Bowen Wall Hook Guides5” to 5½” O.D. . Wt. Lbs.Over 5½” to 6” O.D. . Wt. Lbs.Over 6” to 6½” O.D. . Wt. Lbs.Over 6½” to 7” O.D. . Wt. Lbs.Over 7” to 7½” O.D. . Wt. Lbs.Over 7½” to 8” O.D. . Wt. Lbs.Over 8” to 8½” O.D. . Wt. Lbs.Over 8½” to 9” O.D. . Wt. Lbs.Over 9” to 9½” O.D. . Wt. Lbs.Over 9½” to 10” O.D. . Wt. Lbs.Over 10” to 10½” O.D. . Wt. Lbs.Over 10½” to 11” O.D. . Wt. Lbs.Over 11” to 11½” O.D. . Wt. Lbs.Over 11½” to 12” O.D. . Wt. Lbs.Over 12” to 12½” O.D. . Wt. Lbs.Over 12½” to 13” O.D. . Wt. Lbs.Over 13” to 13½” O.D. . Wt. Lbs.Over 13½” to 14” O.D. . Wt. Lbs.Over 14” to 14½” O.D. . Wt. Lbs.Over 14½” to 15” O.D. . Wt. Lbs.Over 15” to 15½” O.D. . Wt. Lbs.Over 15½” to 16” O.D. . Wt. Lbs.Over 16” to 16½” O.D. . Wt. Lbs.Over 16½” to 17” O.D. . Wt. Lbs.Over 17” to 17½” O.D. . Wt. Lbs.Over 17½” to 18” O.D. . Wt. Lbs.Length of 1
Impression Blocks and Extension SubsBowen Impression BlocksNOV Downhole Bowen Impression Blocks, which consist of a softlead insert in the lower end of a steel housing, are used in fishingoperations. They are designed to enable the operator to determinethe configuration of the top of the fish and to locate its position inthe well bore. Its use enables the operator to more precisely assessthe fishing conditions and select the proper tool or tools needed tosuccessfully complete the fishing operation.OperationTo use an NOV Downhole Bowen Impression Block: Lower the toolinto the well on the lower end of a fishing string of pipe. After theBlock contacts the upper end of the fish, the weight of the string isfurther lowered straight down (never rotate) against the fish whichindents into the soft lead lower end of the Block. When the fishingstring is withdrawn from the well, the impression in the lead willreveal the condition of the fish.Bowen Extension SubsIf a twist-off has left a fish whose upper end is un-engageable, anExtension Sub is installed between Top Sub and the Bowl of theOvershot. This will permit lowering of the Overshot over the fishfar enough to insure a sec
4 Intervention, Retrieval, and Recovery NOV Downhole is the manufacturer of Bowen Fishing Tools, the world’s most respected and reliable fishing tool products in the oil and gas industry for over 85 years. Fishin
