Documents

1150.pdf

Description
S e r i e s 1 5 0 R e l e a s i n g a n d C i r c u l a t i n g O v e r s h o t s SERIES 150 OVERSHOTS Instruction Manual 1150 O n e C o m p a n y U n l i m i t e d S o l u t i o n s O n e C o m p a n y U n l i m i t e d S o l u t i o n s 1150.pmd 11/21/2005, 9:19 PM 1 Series 150 Overshots General Description ................................................. 3 Use ...................................
Categories
Published
of 28
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
   S  er i   e s1  5  0 R el   e a si  n g an d  Ci  r  c ul   a t i  n g Ov er  sh  o t  s SERIES 150 OVERSHOTS Instruction Manual 1150 O n e C o m p a n y U n l i m i t e d S o l u t i o n s   O n e C o m p a n y U n l i m i t e d S o l u t i o n s  Series 150 Overshots General Description ................................................. 3Use............................................................................ 4Construction ............................................................. 4Gripping and Releasing Mechanism .................... 4Pack-off Mechanism.............................................. 5Operation.................................................................. 6Precautions............................................................... 6Undersize Parts ........................................................ 7Spiral Parts................................................................ 7Basket Parts.............................................................. 7Overshot Accessories .............................................. 7Subsea Sheared Pipe Retrieval Method.................. 9Specifications and Replacement Parts.......... 12 – 19Overshot Accessories Tables......................... 20 – 22Calculated Strength Tables ............................ 23 – 24Illustrations............... 3, 5, 7, 8, 9, 10, 17, 19, 20 – 22 The designs and specifications for the tools described in this instruction manual were in effect at the time this manual was approved for printing. National Oilwell Varco, whose policy is oneof continuous improvement, reserves the right to discontinue models at any time, or to change designs and specificationswithout notice or without incurring obligation.Twenty-ninth Printing, September 2005   I   N   D   E  X S e r i e s 1 5 0 O v e r s h o t s  3 Basket GrappleMill Control PackerSeries 150 Releasing and Circulating OvershotDressed with Spiral Grapple and Parts General Description The Bowen Series 150 Releasingand Circulating Overshot  provides thestrongest tool available to externallyengage, pack-off, and pull a fish. Thebasic simplicity and rugged constructionwith which it is designed have madeit the standard of all external catchfishing tools. Series 150 Releasing and Circulating OvershotDressed with Basket Grapple and Parts The Bowen Series 150 Releasing andCirculating Overshot  has gained world-wide acceptance for fishing by meansof external engagement of a fish. EachOvershot is a carefully engineered unit.In service, it takes a positive grip over alarge area of fish and is therefore capa-ble of withstanding extremely heavy pull-ing, torsional and jarring strains withoutdamage or distortion to either the toolor the fish.Bowen Overshots are continually devel-oped to new standards of strength andefficiency and are expertly constructedof the highest quality material.Each Bowen Series 150 Releasing andCirculating Overshot is a compact unitdesigned to engage, pack off and pull aspecific size of tubing, pipe, coupling,tool joint, drill collar or smooth O.D. tool.Through the installation of proper under-size parts, they may be adapted toengage and pack off any smaller size. Spiral Grapple ControlBasket Grapple ControlSpiral GrappleBasket GrappleType A Packer Top SubType APacker BowlSpiralGrappleGrappleControlGuideTop SubBowlBasketGrappleMillControlPacker Guide  4 Bowen course thread Overshots aredesigned for easier assembly andmaintenance. The Bowen “CT” Overshothas a course ACME thread on the upperend of the Bowl where the Top Sub isattached and at lower end where theGuide is attached. See SupplementalInstruction Manual 1150A for list.The course thread allows much easierfield assembly and will stand moreabuse than the fine series currentlyoffered. The internal parts are completelyinterchangeable with existing BowenOvershots.Cross over bushings can be providedfrom fine thread series to course threadseries, allowing full use of Bowls, TopSubs, and Guides currently in stock. All sizes of Bowen Series 150 Releasingand Circulating Overshot are available inFull Strength or Slim Hole Types. Despitethe extremely small outside diametersof Full Strength Type Overshots, theyare engineered to withstand the pulling,torsional and jarring strains, which mustbe exerted by modern machinery, torelease and retrieve a lost fish.The Slim Hole Type Overshots havereduced outside diameters, as com-pared to the Full Strength. They are usedto perform pulling jobs in tight holeswhere no other outside catch, releasingfishing tool can be run. Use  A Bowen Series 150 Releasing andCirculating Overshot is used to engage,pack off and retrieve twisted-off or losttubing, drill pipe, coupling, tool joint,casing or other similar fish. Construction The Bowen Series 150 Releasing andCirculating Overshot is composed ofthree outside parts: the Top Sub, Bowl,and Guide. The Basic Overshot may bedressed with either of two sets of internalparts, depending on whether the fish tobe caught is near maximum catch sizefor the particular overshot.If the fish diameter is near the maximumcatch of the Overshot, a Spiral Grapple,Spiral Grapple Control and Type “A”Packer are used. If the fish is a tubingcollar, a Type “D” Collar Packoff Assem-bly will replace the Type “A” Packer.If the fish diameter is considerably belowmaximum catch size (usually 1 ¦ 2 ), aBasket Grapple and a Mill Control Packeris used. Gripping andReleasing Mechanism The Bowl of the Overshot is designedwith helically tapered spiral section in itsinside diameter. The gripping member(Spiral Grapple or Basket Grapple), isfitted into this section. When an upwardpull is exerted against a fish, an expan-sion strain is spread evenly over a longsection of the fish. No damage or distor-tion results to either the fish or the Over-shot. This design permits a far strongertool with a smaller outside diameter thanis possible with an overshot that employsa single tapered section which supportsslips. A Spiral Grapple is formed as a left-handhelix with a tapered exterior to conformwith the helically tapered section in theBowl. Its interior is wickered for engage-ment with the fish. A Basket Grapple is an expansible cylin-der with a tapered exterior to conform tothe helically tapered section in the Bowl.Its interior is wickered for engagementwith the fish.Three types of Basket Grapples areavailable to meet the need for catchingvarious types of fish:The Plain Basket Grapple is standard,and will always be furnished unlessanother type is specified. It is wickeredfor its entire interior length. It is used tocatch any plain single diameter fish.The Basket Grapple with Long CatchStop has an internal shoulder located atthe upper end, to stop the fish in bestcatch position. It is designed to stop andcatch an upset, or box section of a tooljoint, with sufficient length left below theGrapple to allow the joint or upset to bepacked off with a Basket Mill ControlPacker.The Basket Grapple with Short CatchStop has a double set of wickers, of twodifferent internal diameters. It is used tostop and catch a coupling with aruptured piece of pipe engaged in itsupper end. The upper set of wickers willcatch the ruptured pipe, and act as astop against the coupling, while thelower set of wickers will catch the coup-ling. The coupling will be stopped in bestposition to be packed off by the MillControl Packer.Grapple Controls are of two types: SpiralGrapple Controls are used with SpiralGrapples; Mill Control Packers are usedwith Basket Grapples.Grapple Controls are used as a specialkey, to allow the Grapple to move up anddown during operation while simulta-neously transmitting full torque from theGrapple to the Bowl.Spiral Grapple Controls and BasketGrapple Controls are plain. Mill ControlPackers include a packoff. See Pack-offMechanism for a complete explanation.In operation, the Overshot functions inthe same manner, whether dressed withSpiral Grapple parts or Basket Grappleparts
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks