EP0418057A1 - Cloche de repêchage - Google Patents

Cloche de repêchage Download PDF

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Publication number
EP0418057A1
EP0418057A1 EP90309982A EP90309982A EP0418057A1 EP 0418057 A1 EP0418057 A1 EP 0418057A1 EP 90309982 A EP90309982 A EP 90309982A EP 90309982 A EP90309982 A EP 90309982A EP 0418057 A1 EP0418057 A1 EP 0418057A1
Authority
EP
European Patent Office
Prior art keywords
slip
thin
tool
tubing
grip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90309982A
Other languages
German (de)
English (en)
Inventor
Kenneth Alexander Murray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tri State Oil Tool UK Ltd
Tri State Oil Tools Inc
Original Assignee
Tri State Oil Tool UK Ltd
Tri State Oil Tools Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tri State Oil Tool UK Ltd, Tri State Oil Tools Inc filed Critical Tri State Oil Tool UK Ltd
Publication of EP0418057A1 publication Critical patent/EP0418057A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot

Definitions

  • This invention relates to overshot fishing tools and relates more particularly but not exclusively to overshots for fishing coil tubing that is trapped down oil or gas wells.
  • coil tubing is the ability to workover the well without the use of a drilling rig, thus saving time and workover costs.
  • coil tubing may be:- fluid cleanouts; N2 gas lifts; cement squeeze; acid and chemical spotting; descaling and cement drilling; fishing operations.
  • the purpose of the fishing operation is to locate, latch, and retrieve the stuck or severed piece of coil tubing which has been left in the wellbore.
  • coil tubing fishing tools have latching mechanisms which are designed to catch a nominal size tubing. Most are energised by upwards pull against tapered surfaces. However, such tools are designed for a nominal minimum catch size. Coil tubing, being very ductile and relatively thin walled, is quite easy to collapse. Therefore if by the time the minimum catch size has been reached on the grapple, the fish or coil tubing has not come free, the overshot or fishing tool may slip off prematurely.
  • the term "thin-wall tubing” refers to tubing which has a wall thickness significantly less than the wall thickness of strings, pipes, casings, and the like, which are sufficiently thick-walled as to substantially withstand radial collapsing loads applied thereto by the slip of a typical prior-art overshot fishing tool.
  • thin-wall tubing is liable to suffer a radial collapse when subjected to the radial gripping force applied thereto by the slip of a typical prior-art overshot fishing tool upon an overpull being applied in an attempt to free stuck thin-wall tubing.
  • the term "thin-wall tubing" particularly but not exclusively includes coil tubing as employed for through-tubing workover programmes on oil or gas wells.
  • an overshot fishing tool for use on thin-wall tubing extending longitudinally through said tool, said overshot fishing tool comprising at least one slip radially actuable by a longitudinal pull on said tool to apply a radially inwardly directed grip on thin-wall tubing in a longitudinally concentrated region thereof, said slip being such that said radially inwardly directed grip is maintained on said longitudinally concentrated region of the thin-wall tubing as said region circumferentially contracts by necking of the thin-wall tubing while said longitudinal pull exceeds the longitudinal yield level of said thin-wall tubing in said longitudinally concentrated region thereof, until said thin-wall tubing longitudinally parts at said region unless said longitudinal pull previously exceeds a longitudinal force longitudinally restraining longitudinal movement of the thin-wall tubing.
  • Said slip preferably comprises a circumferentially distributed array of radially inwardly moveable and radially inwardly directed jaws each shaped for line contact with the thin-wall tubing along a common circumference thereof.
  • Said slip is preferably formed by a cylindriform array of a plurality of fingers longitudinally extending from a common circumferentially extending annulus, said fingers being mutually divided by longitudinally extending slots and said jaws being formed adjacent the free ends of said fingers, one said slot preferably extending through said annulus.
  • the free ends of said fingers are preferably externally tapered away from said common annulus to form a generally conical external surface
  • said tool preferably also comprises a substantially matchingly conical internal surface such that relative longitudinal movement of said surfaces produces a wedging action that causes said slip to apply said radially inwardly directed grip.
  • Said conical internal surface is preferably formed on a slip bowl mounted inside said tool and operatively associated with said slip.
  • Said tool preferably comprises two such slips and slip bowls longitudinally spaced along the longitudinal axis of said tool with one said slip being the upper slip and having its jaws dimensioned to grip the thin-wall tubing in a primary grip prior to a secondary grip applied to the thin-wall tubing by the jaws of the other said slip, the slip bowl operatively associated with said upper slip being mounted inside said tool for limited longitudinal movement relative to said tool such that upon said primary grip being applied to the thin-wall tubing, said slip bowl undergoes longitudinal movement to engage the other said slip to drive the other said slip against the slip bowl operatively associated therewith to cause the other said slip to apply said secondary grip to the thin-wall tubing.
  • a fishing arrangement for fishing thin-wall tubing comprising an overshot fishing tool according to the first aspect of the present invention, in combination with a hollow fishing string having a through bore with an internal diameter greater than the external diameter of thin-wall tubing to be fished by said arrangement, said through bore having an internal length at least equal to the length of thin-wall tubing to be swallowed thereby to the point at which the thin-wall tubing is to be gripped by said tool and potentially parted thereby.
  • the first embodiment of the present invention is an overshot twin-slip fishing tool 10 having an upper slip assembly 12 and a lower slip assembly 14.
  • the tool 10 is generally cylindrical, with a main hollow casing section 16 and an upper casing section 18 secured to the main casing section 16 by means of a screw-thread connection 20.
  • a screw-thread connection 22 at the lower end of the main casing section 16 and a screw-thread connection 24 at the upper end of the upper casing section 18 enable the tool 10 to be screw-threadedly coupled into a hollow fishing string during use of the tool 10.
  • the upper slip assembly 12 comprises a cylindriform slip 26 having six fingers 28 depending from a common circumferentially extending annulus 30.
  • the fingers 28 are defined by and mutually separated by longitudinally extending slots 32 one of which extends through the annulus 30 to give the slip 26 as a whole circumferential elasticity, while this and the other slots 32 cause the fingers 28 to act as radially deformable resilient cantilevers rooted in the annulus 30.
  • the free ends of the slip fingers 28 are formed with radially inwardly facing bi-conical jaws 34 with serrated upper surfaces 36. It is of particular significance, as will be detailed below, that the slip jaws 34 collectively form a single very narrow internal gripping circumference 38 in the slip 26.
  • the outer surfaces 40 of the free ends of the slip fingers 28 are conically tapered and are co-operatively associated with a matchingly tapered surface 42 formed on a slip bowl 44 forming the other major component of the upper slip assembly 12 besides the slip 26.
  • the slip bowl 44 is externally cylindrical and mounted within the base of the main casing section 16 to have a limited range of longitudinal movement therein, for a purpose detailed below.
  • the lower slip assembly 14 similarly comprises a slip 46 and a slip bowl 48, the lower slip 46 being substantially identical to the upper slip 26, and the lower slip bowl 48 being substantially identical to the upper slip bowl 44, save that the lower slip bowl 48 is mounted within the main casing section 16 to be static therein during use of the tool 10.
  • the slips 26 and 46 together with the slip bowls 44 and 48 are formed of nitride case-hardened alloy steel.
  • a diametral section of the upper and lower slip assemblies 12 and 14 is shown to an enlarged scale in Fig. 2, while details of the serrated upper jaw surfaces 36 are shown to an even larger scale in Fig. 3.
  • the upper slip 26 is shown moved downwards relative to its cooperatively associated slip bowl 44 such that the tapered surfaces 40 and 42 respectively on the slip 26 and on the slip bowl 44 have interacted to force each of the slip jaws 34 radially inwards all round the slip 26, by radially inward bending of the slip fingers 28, and to a certain extent, by closing-up of the one of the longitudinal slots 32 that extends completely through the slip annulus 30.
  • the lower slip assembly 16 as depicted in Fig. 2
  • the lower slip 46 is not moved towards its co-operatively associated slip bowl 48, and the lower slip 46 is fully uncontracted.
  • Fig. 3 the detail is a diametral sectional view of the tip of the slip jaw 34. Not directly visible in Fig. 3 (but see Fig. 1) is the formation of the serrations 36 as a left-hand wicker thread to facilitate rotational removal of fish after use of the tool 10. This structural feature is the same on both of the slips 26 and 46.
  • the function of the continuous coil tubing slip-type overshot fishing tool 10 of the present invention is to swallow the coil tubing continuously up through the bore of its casing sections 16 and 18.
  • a suitably sized workstring fishing string
  • fishing string will be run above the overshot fishing tool 10 to accommodate the coil tubing fish being swallowed. Once swallowed to a sufficient extent, an upward pull of the workstring will then engage the slips 26 and 46 on to the outside diameter of the coil tubing securing it firmly.
  • the slips 26 and 46 are manufactured with an internally tapered wicker thread, the point 36 of which initially concentrates a radial crushing load on the circumference of the coil tubing fish to cause necking (circumference reduction) of the coil tubing.
  • the wicker profile is case hardened to bite in to the coil tubing. Once necking has progressed to the point at which the coil tubing fish is parted, the coil tubing may then be pulled from the well.
  • the slips have shown in practice to be capable of carrying up to 80% of the yield strength of the coil tubing as necking has been apparent on tests conducted. Once yielding has occurred then an overpull applied through the fishing string will result in a tensile failure of the coil tubing directly underneath the lower slip teeth. This controlled overpull allows the operator to govern his overpull at his own discretion during the fishing and retrieval operation.
  • slip-type coil tubing overshot as a latch and retrieve overshot in instances where the coil tubing is not stuck.
  • the slip-type overshot fishing tool 10 because of its design, may be run on a stronger and suitably sized coil tubing fishing string. This gives the capacity to pull and retrieve the coil tubing, if free, or the capacity to latch and break, if the coil tubing is permanently stuck.
  • a packoff sub may be run in conjunction with the overshot fishing tool 10 to enable latch and circulation through the complete workstring.
  • the overshot fishing tool 10 leaves the top of the coil tubing in good round clean condition for relatching, if necessary.
  • the slips 26 and 46 in the coil tubing slip-type overshot fishing tool 10 can accommodate up to plus 20% out-of-round fish or flattened fish during initial engagement.
  • the dual slip design shown in Fig. 1 allows either slip 26 or 46 to carry the ultimate breaking load of the coil tubing on the grapple legs 28, in the unlikely event that radial collapse of the coil tubing is evident beyond the designed allowable travel on the tapered slip bowls 44 and 48. Once this point is reached the external shoulder (40) on the respective slip 26 or 46 locates on the upper shoulder (42) of the slip bowl 44 or 48 and the grapple legs 28 are subjected to the overpull load.
  • the dual slip design allows partial distribution of the load across both slips 26 and 46.
  • the slips 26 and 46 have mutually different catch (jaw point) diameters to induce latching in a controlled manner.
  • the upper slip 26 having a smaller natural (uncontracted) jaw point (36) diameter in the free state it is designed to bite first on the coil tubing, transferring the applied axial pull down through the upper slip bowl 44 to the shoulder (annulus) of the lower slip 46 causing it to collapse down the tapered lower slip bowl 48 and bite the coil tubing for a second time.
  • This controlled loading mechanism allows both slips 26 and 46 to carry longitudinal fishing load. However, it is recognised that the coil tubing immediately below the lower slips 46 is subjected to the higher tensile load, therefore inducing the break in the coil tubing directly below the teeth on the lower slip 46.
  • the overshot fishing tool 10 of the present invention is suitable for coil tubing or other thin-wall tubing fish because the tool 10 concentrates a high radial load on a longitudinally highly localised region of the thin-wall tubing (effectively on a single circumferential line) at the point 36 where the slip jaws 34 grapple the thin-wall tubing, which ensures continued engagement even as the thin-wall tubing collapses radially inwards.
  • the slips 26 and 46 also have an allowable radially inward jaw contraction far exceeding the equivalent maximum contraction on conventional overshots. This ensures continued slip grip until necking has progressed to the point of parting the thin-wall tubing.
  • Prior art slips distribute their circumferential grip over a much greater axial length of the fish, as they are designed to do to avoid excessive radial load concentration.
  • the prior art slips are also designed to have a much greater minimum diameter at which radial grip is maintained, such that when used on thin-wall tubing, such tubing will collapse to the point at which grip is lost, before necking progresses to the extent that the thin-wall tubing is parted.
  • Prior art fishing tools which maintain grip on tubing without load concentration may be able to pull the tubing free by breaking it by means of an overpull, but the position of the break will not be controlled and could occur anywhere, being determined only by the overpull and not by necking at a predetermined position on the tubing.
  • the overshot fishing tool 10 of the present invention is ideal for fishing coil tubing and other thin-wall tubing, as it is designed to concentrate loading in a manner parting the tubing, and to maintain such grip despite the relatively large diameter reduction involved. If the tubing fish pulls free before being parted by necking, the result is equally satisfactory in terms of removing the fish from the borehole.
  • Fig. 4 depicts, in a highly schematic manner, a second embodiment 100 of overshot fishing tool in accordance with the invention, and its effect on a coil tubing fish 102.
  • the second embodiment differs from the first embodiment (shown in Fig. 1 and detailed in Figs. 2 and 3) in that the second embodiment employs a single slip 104 (schematically depicted in Fig. 4 by a single diametral longitudinal cross-section).
  • the slip 104 is formed to the same design as the slip 26 detailed in Fig. 2, and is co-operatively associated with an internally tapered slip bowl (omitted from Fig. 4) of the same design as the slip bowl 44 detailed in Fig. 2.
  • Fig. 4 schematically depicts the slip 104 having applied a radially inwardly directed and highly concentrated line load on the tubing 102 to an extent that the tubing 102 has necked and ultimately parted, so enabling fishing of coil tubing (or other thin-wall tubing) by controlled parting of the tubing at a predetermined location (the point of application of the single-slip overshot fishing tool 100).

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP90309982A 1989-09-12 1990-09-12 Cloche de repêchage Withdrawn EP0418057A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8920606 1989-09-12
GB898920606A GB8920606D0 (en) 1989-09-12 1989-09-12 Slip type coil tubing overshot

Publications (1)

Publication Number Publication Date
EP0418057A1 true EP0418057A1 (fr) 1991-03-20

Family

ID=10662941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90309982A Withdrawn EP0418057A1 (fr) 1989-09-12 1990-09-12 Cloche de repêchage

Country Status (3)

Country Link
EP (1) EP0418057A1 (fr)
GB (1) GB8920606D0 (fr)
NO (1) NO903983L (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012007724A3 (fr) * 2010-07-16 2013-03-28 Helix Energy Solutions (Uk) Limited Appareil à tube et procédés associés
CN105649565A (zh) * 2016-03-30 2016-06-08 中煤特殊凿井有限责任公司 钻具打捞装置
CN106639947A (zh) * 2016-12-06 2017-05-10 贵州高峰石油机械股份有限公司 一种大范围打捞筒
CN108035689A (zh) * 2018-01-29 2018-05-15 上海广大基础工程有限公司 一种钢管打捞装置
CN108533204A (zh) * 2018-07-06 2018-09-14 西安荣达石油工程有限公司 一种打捞筒
US10408013B2 (en) 2017-06-15 2019-09-10 Saudi Arabian Oil Company Wellbore parted casing access tool
CN111021979A (zh) * 2019-12-30 2020-04-17 中国石油集团川庆钻探工程有限公司 一种油气井用可退式井下打捞工具
CN111648737A (zh) * 2020-07-01 2020-09-11 中煤科工集团重庆研究院有限公司 煤矿井下用夹持式造扣打捞钻头
CN112112594A (zh) * 2020-09-22 2020-12-22 朱鸿磊 一种石油仪器打捞装置
CN112302576A (zh) * 2019-07-29 2021-02-02 中国石油化工股份有限公司 井下小油管装置和管柱
US11549324B2 (en) 2020-08-21 2023-01-10 Saudi Arabian Oil Company Pumping stinger overshot
US11686177B2 (en) 2021-10-08 2023-06-27 Saudi Arabian Oil Company Subsurface safety valve system and method
CN116752923A (zh) * 2023-08-16 2023-09-15 牡丹江市林海石油打捞工具有限公司 螺杆泵液压打捞筒
US11773677B2 (en) 2021-12-06 2023-10-03 Saudi Arabian Oil Company Acid-integrated drill pipe bars to release stuck pipe
US11867016B2 (en) 2021-12-15 2024-01-09 Saudi Arabian Oil Company Robotic fishing tool

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109577868B (zh) * 2017-09-29 2023-09-26 中国石油天然气股份有限公司 一种修井装置
CN108590559B (zh) * 2018-07-12 2024-03-22 长江大学 一种井下打捞装置
CN116181269B (zh) * 2023-04-25 2023-08-18 东营市鑫吉石油技术有限公司 一种双抓钩变径电动打捞器及其使用方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174548A (en) * 1963-09-06 1965-03-23 Houston Engineers Inc Combination washover tool, pipe cutter and retriever
US3727967A (en) * 1971-06-17 1973-04-17 Inst Proiectari Si Cercetari P Universal overshot
US4185865A (en) * 1975-06-04 1980-01-29 Taylor William T Releasable wireline overshot

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174548A (en) * 1963-09-06 1965-03-23 Houston Engineers Inc Combination washover tool, pipe cutter and retriever
US3727967A (en) * 1971-06-17 1973-04-17 Inst Proiectari Si Cercetari P Universal overshot
US4185865A (en) * 1975-06-04 1980-01-29 Taylor William T Releasable wireline overshot

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2496536A (en) * 2010-07-16 2013-05-15 Helix Energy Solutions U K Ltd Tubing apparatus and associated methods
US9297220B2 (en) 2010-07-16 2016-03-29 Helix Energy Solutions (U.K.) Limited Tubing apparatus and associated methods
WO2012007724A3 (fr) * 2010-07-16 2013-03-28 Helix Energy Solutions (Uk) Limited Appareil à tube et procédés associés
GB2496536B (en) * 2010-07-16 2019-01-02 Helix Energy Solutions U K Ltd Tubing apparatus
CN105649565A (zh) * 2016-03-30 2016-06-08 中煤特殊凿井有限责任公司 钻具打捞装置
CN106639947A (zh) * 2016-12-06 2017-05-10 贵州高峰石油机械股份有限公司 一种大范围打捞筒
US10648278B2 (en) 2017-06-15 2020-05-12 Saudi Arabian Oil Company Wellbore parted casing access tool
US10815751B2 (en) 2017-06-15 2020-10-27 Saudi Arabian Oil Company Wellbore parted casing access tool
US10408013B2 (en) 2017-06-15 2019-09-10 Saudi Arabian Oil Company Wellbore parted casing access tool
CN108035689A (zh) * 2018-01-29 2018-05-15 上海广大基础工程有限公司 一种钢管打捞装置
CN108533204A (zh) * 2018-07-06 2018-09-14 西安荣达石油工程有限公司 一种打捞筒
CN112302576A (zh) * 2019-07-29 2021-02-02 中国石油化工股份有限公司 井下小油管装置和管柱
CN111021979A (zh) * 2019-12-30 2020-04-17 中国石油集团川庆钻探工程有限公司 一种油气井用可退式井下打捞工具
CN111648737A (zh) * 2020-07-01 2020-09-11 中煤科工集团重庆研究院有限公司 煤矿井下用夹持式造扣打捞钻头
US11549324B2 (en) 2020-08-21 2023-01-10 Saudi Arabian Oil Company Pumping stinger overshot
CN112112594A (zh) * 2020-09-22 2020-12-22 朱鸿磊 一种石油仪器打捞装置
CN112112594B (zh) * 2020-09-22 2024-01-30 杨晓峰 一种石油仪器打捞装置
US11686177B2 (en) 2021-10-08 2023-06-27 Saudi Arabian Oil Company Subsurface safety valve system and method
US11773677B2 (en) 2021-12-06 2023-10-03 Saudi Arabian Oil Company Acid-integrated drill pipe bars to release stuck pipe
US11867016B2 (en) 2021-12-15 2024-01-09 Saudi Arabian Oil Company Robotic fishing tool
CN116752923A (zh) * 2023-08-16 2023-09-15 牡丹江市林海石油打捞工具有限公司 螺杆泵液压打捞筒
CN116752923B (zh) * 2023-08-16 2023-11-07 牡丹江市林海石油打捞工具有限公司 螺杆泵液压打捞筒

Also Published As

Publication number Publication date
GB8920606D0 (en) 1989-10-25
NO903983D0 (no) 1990-09-12
NO903983L (no) 1991-03-13

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