GB201204286D0 - A downhole back off sub - Google Patents

A downhole back off sub

Info

Publication number
GB201204286D0
GB201204286D0 GB201204286A GB201204286A GB201204286D0 GB 201204286 D0 GB201204286 D0 GB 201204286D0 GB 201204286 A GB201204286 A GB 201204286A GB 201204286 A GB201204286 A GB 201204286A GB 201204286 D0 GB201204286 D0 GB 201204286D0
Authority
GB
United Kingdom
Prior art keywords
housing
housing parts
drive shaft
pair
relative
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Withdrawn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
GB201204286A
Other versions
GB2500185A (en
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.)
Tercel IP Ltd
Original Assignee
Tercel IP Ltd
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 Tercel IP Ltd filed Critical Tercel IP Ltd
Priority to GB201204286A priority Critical patent/GB2500185A/en
Publication of GB201204286D0 publication Critical patent/GB201204286D0/en
Publication of GB2500185A publication Critical patent/GB2500185A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/021—Devices for subsurface connecting or disconnecting by rotation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/18—Connecting or disconnecting drill bit and drilling pipe

Abstract

A downhole back off sub10 comprises a housing 2 couplable with a drive shaft 3, the housing 2 comprising a pair of housing parts 21, 22 rotatable relative to each other about a common rotation axis 23 and engaged together via a kinematic pair, which may be provided by cooperating threads 24 arranged to translate the relative rotation of the housing parts 21, 22 into longitudinal displacement. A transmission mechanism 5, which may be provided by a harmonic drive 51, isarranged to selectively transmit the rotation of the drive shaft 3 to at least one of the pair of the housing parts 21, 22 to induce the relative rotation and the resulting relative longitudinal of the housing parts 21, 22. Rapid reconnection/disconnection can be achieved by interrupting the transmission mechanism 7 and locking one housing part directly to the drive shaft 3.
GB201204286A 2012-03-12 2012-03-12 A Downhole Back Off Sub Withdrawn GB2500185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201204286A GB2500185A (en) 2012-03-12 2012-03-12 A Downhole Back Off Sub

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201204286A GB2500185A (en) 2012-03-12 2012-03-12 A Downhole Back Off Sub

Publications (2)

Publication Number Publication Date
GB201204286D0 true GB201204286D0 (en) 2012-04-25
GB2500185A GB2500185A (en) 2013-09-18

Family

ID=46026359

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201204286A Withdrawn GB2500185A (en) 2012-03-12 2012-03-12 A Downhole Back Off Sub

Country Status (1)

Country Link
GB (1) GB2500185A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014140658A1 (en) * 2013-03-15 2014-09-18 Tercel Ip Limited Tool for selectively connecting or disconnecting components of a downhole workstring
US9493230B2 (en) * 2013-11-21 2016-11-15 Hamilton Sundstrand Corporation Drive assembly with selective disconnect
US9353804B2 (en) * 2014-07-08 2016-05-31 Hamilton Sundstrand Corporation Harmonic drive assembly with selective disconnect and method
EP4296542A1 (en) * 2022-06-20 2023-12-27 Goodrich Actuation Systems SAS Strain wave gearing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6186249B1 (en) * 1998-01-14 2001-02-13 Thor Bjornstad Release equipment for a drill string
US8297365B2 (en) * 2006-06-27 2012-10-30 Vortexx Research, Ltd Drilling string back off sub apparatus and method for making and using same
GB2468271B (en) * 2008-11-28 2013-06-19 Intelligent Drilling Tools Ltd Disconnect device for downhole assembly

Also Published As

Publication number Publication date
GB2500185A (en) 2013-09-18

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)