NO20061086L - Kommunikasjons- og laseverktoy for apen stilling i styresystem og fremgangsmate for a lase en sikkerhetsventil, som kommuniserer med overflaten, i apen stilling - Google Patents

Kommunikasjons- og laseverktoy for apen stilling i styresystem og fremgangsmate for a lase en sikkerhetsventil, som kommuniserer med overflaten, i apen stilling

Info

Publication number
NO20061086L
NO20061086L NO20061086A NO20061086A NO20061086L NO 20061086 L NO20061086 L NO 20061086L NO 20061086 A NO20061086 A NO 20061086A NO 20061086 A NO20061086 A NO 20061086A NO 20061086 L NO20061086 L NO 20061086L
Authority
NO
Norway
Prior art keywords
valve
communication
open position
safety valve
cutter
Prior art date
Application number
NO20061086A
Other languages
English (en)
Inventor
Scott Clayton Strattan
Thomas S Myerley
Original Assignee
Baker Hughes 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 Baker Hughes Inc filed Critical Baker Hughes Inc
Publication of NO20061086L publication Critical patent/NO20061086L/no

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/02Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/08Cutting or deforming pipes to control fluid flow
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/10Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/10Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • E21B34/106Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid the retrievable element being a secondary control fluid actuated valve landed into the bore of a first inoperative control fluid actuated valve
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/10Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • E21B34/107Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid the retrievable element being an operating or controlling means retrievable separately from the closure member, e.g. pilot valve landed into a side pocket
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/12Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/14Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Joints With Sleeves (AREA)

Abstract

Det er her vist en kommunikasjons- og låse-åpen-anordning (30) som innbefatter et låse-åpen-parti omfattende en sperre som er utformet for inngrep med en omstillingsprofil (165) på et lukkeelement (16) i en sikringsventil (10). Videre inngår et kommunikasjonsparti som er utformet for rotasjonsmessig innretting av en kutter (100) med en ikke-ringformet hydraulisk kammer (20) i sikringsventilen (10) og aksial innskjæring i den hydrauliske kammer (20) ved hjelp av kutteren (100). Det er også vist en fremgangsmåte for erstatning av funksjonen til en sikringsventil (10) under anvendelse av en opprinnelig styreledning (22) innbefattende kjøring av et kommunikasjons- og låse-åpen-verktøy (30) i et borehull, plassering av verktøyet (30) i en rørmontert sikringsventil (10) og avskjæring av en gjenge (12) i ventilen (10) for å bevegeliggjøre et lukkeelement (16) i den rørmonterte sikringsventilen (10). Fremgangsmåten omfatter omstilling av lukkeelementet (16) for å låse elementet (16) i en åpen stilling, orientering av en kutter (100) og opprettelse av fluidkommunikasjon med en boring i ventilen (10).
NO20061086A 2003-10-27 2006-03-06 Kommunikasjons- og laseverktoy for apen stilling i styresystem og fremgangsmate for a lase en sikkerhetsventil, som kommuniserer med overflaten, i apen stilling NO20061086L (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51488303P 2003-10-27 2003-10-27
PCT/US2004/035623 WO2005045184A1 (en) 2003-10-27 2004-10-27 Control system communication and lock open tool and method for locking open a safety valve and communicating with surface

Publications (1)

Publication Number Publication Date
NO20061086L true NO20061086L (no) 2006-05-26

Family

ID=34572785

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20061086A NO20061086L (no) 2003-10-27 2006-03-06 Kommunikasjons- og laseverktoy for apen stilling i styresystem og fremgangsmate for a lase en sikkerhetsventil, som kommuniserer med overflaten, i apen stilling

Country Status (8)

Country Link
US (1) US7409996B2 (no)
CN (2) CN101493002B (no)
AU (2) AU2004288169B2 (no)
CA (3) CA2636887C (no)
GB (3) GB2436230B (no)
NO (1) NO20061086L (no)
RU (1) RU2370634C2 (no)
WO (1) WO2005045184A1 (no)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7703538B2 (en) 2006-06-23 2010-04-27 Baker Hughes Incorporated Access apparatus from a tubular into a downhole hydraulic control circuit and associated method
US7699108B2 (en) * 2006-11-13 2010-04-20 Baker Hughes Incorporated Distortion compensation for rod piston bore in subsurface safety valves
BRPI0807531B1 (pt) 2007-02-13 2018-06-12 Bj Services Company Ferramenta de comunicação para estabelecer comunicação de fluido entre uma linha de controle e um dispositivo de fundo de poço e método para estabelecer comunicação de fluido com um dispositivo de fundo de poço
BRPI0807470B1 (pt) 2007-02-13 2018-11-06 Bj Services Co ferramenta de comunicação e método para válvula de segurança subsuperficial com componente de comunicação
US7637324B2 (en) * 2007-07-03 2009-12-29 Baker Hughes Incorporated Isolation valve for subsurface safety valve line
US7717185B2 (en) * 2008-07-14 2010-05-18 Baker Hughes Incorporatd Lock open and control system access apparatus for a downhole safety valve
US8205637B2 (en) 2009-04-30 2012-06-26 Baker Hughes Incorporated Flow-actuated actuator and method
US8047293B2 (en) 2009-05-20 2011-11-01 Baker Hughes Incorporated Flow-actuated actuator and method
US7967076B2 (en) 2009-05-20 2011-06-28 Baker Hughes Incorporated Flow-actuated actuator and method
US8522877B2 (en) * 2009-08-21 2013-09-03 Baker Hughes Incorporated Sliding sleeve locking mechanisms
NO337055B1 (no) * 2010-02-17 2016-01-11 Petroleum Technology Co As En ventilanordning for bruk i en petroleumsbrønn
US8857785B2 (en) 2011-02-23 2014-10-14 Baker Hughes Incorporated Thermo-hydraulically actuated process control valve
CN102409999B (zh) * 2011-12-05 2015-02-25 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 一种井下安全阀强开工具的设计方法
CN102587860B (zh) * 2012-03-27 2014-04-16 迟恒春 可取出式防堵安全阀及其专用打捞工具
EP2875205B1 (en) * 2012-07-18 2017-02-01 Halliburton Energy Services, Inc. A pressure-operated dimple lockout tool
US9903181B2 (en) 2014-07-10 2018-02-27 Baker Hughes, A Ge Company, Llc Communication and lock open safety valve system and method
CN107466336A (zh) * 2015-04-15 2017-12-12 哈利伯顿能源服务公司 井下工具的远程液压控制
CN108222874B (zh) * 2017-12-08 2020-03-27 宝鸡石油机械有限责任公司 一种井下开孔工具
US10808478B2 (en) * 2018-02-14 2020-10-20 Weatherford Technology Holdings, Llc Assembly and method for performing aligned operation with tool oriented in downhole tubular
US10920529B2 (en) 2018-12-13 2021-02-16 Tejas Research & Engineering, Llc Surface controlled wireline retrievable safety valve
US11359442B2 (en) 2020-06-05 2022-06-14 Baker Hughes Oilfield Operations Llc Tubular for downhole use, a downhole tubular system and method of forming a fluid passageway at a tubular for downhole use
CN111927391B (zh) * 2020-08-17 2021-10-15 川南航天能源科技有限公司 用于油管内的安全阀及其工作方法
US11661826B2 (en) 2021-04-28 2023-05-30 Halliburton Energy Services, Inc. Well flow control using delayed secondary safety valve
CN113266289B (zh) * 2021-07-06 2023-09-01 中海石油(中国)有限公司 海上油气井隔水管反顶回收方法

Family Cites Families (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111989A (en) * 1960-02-15 1963-11-26 Otis Eng Co Perforator for well flow conductors
US3301337A (en) * 1964-05-05 1967-01-31 Alpha Trace Inc Apparatus for completing a well
US3696868A (en) * 1970-12-18 1972-10-10 Otis Eng Corp Well flow control valves and well systems utilizing the same
US3799258A (en) * 1971-11-19 1974-03-26 Camco Inc Subsurface well safety valve
US3763932A (en) * 1971-12-27 1973-10-09 Brown Oil Tools Surface operated, subsurface safety valve assembly
US3786866A (en) * 1973-03-06 1974-01-22 Camco Inc Lockout for well safety valve
US3786865A (en) * 1973-03-06 1974-01-22 Camco Inc Lockout for well safety valve
US3981358A (en) * 1975-11-14 1976-09-21 Camco, Incorporated Well safety valve
US4077473A (en) * 1977-04-18 1978-03-07 Camco, Incorporated Well safety valve
US4165784A (en) * 1977-09-26 1979-08-28 Gardner Benjamin R Casing perforator
US4161960A (en) * 1978-02-23 1979-07-24 Camco, Incorporated High and low tubing pressure actuated well safety valve
US4201363A (en) * 1978-07-17 1980-05-06 Otis Engineering Corporation Tubing retrievable surface controlled subsurface safety valve
US4260021A (en) * 1979-01-09 1981-04-07 Hydril Company Plug catcher tool
US4215748A (en) * 1979-01-11 1980-08-05 Camco, Incorporated Lockout for a well injection valve
US4273194A (en) * 1980-02-11 1981-06-16 Camco, Incorporated Annular flow control safety valve
US4344602A (en) * 1980-10-16 1982-08-17 Otis Engineering Corporation Lock open mechanism for subsurface safety valve
US4420041A (en) * 1981-02-09 1983-12-13 Otis Engineering Corporation Method of using a valve in gravel packing
US4411316A (en) * 1981-02-09 1983-10-25 Baker International Corporation Subterranean well valve with lock open mechanism
US4356867A (en) * 1981-02-09 1982-11-02 Baker International Corporation Temporary lock-open tool for subterranean well valve
US4542792A (en) * 1981-05-01 1985-09-24 Baker Oil Tools, Inc. Method and removable auxiliary apparatus for permanently locking open a well flow control device
US4475599A (en) * 1981-05-01 1984-10-09 Baker International Corporation Valve for subterranean wells
US4406325A (en) * 1981-10-02 1983-09-27 Baker International Corporation Selective no-go apparatus
US4449587A (en) * 1983-01-06 1984-05-22 Otis Engineering Corporation Surface controlled subsurface safety valves
US4606410A (en) * 1983-04-06 1986-08-19 Bst Lift Systems, Inc. Subsurface safety system
US4577694A (en) * 1983-12-27 1986-03-25 Baker Oil Tools, Inc. Permanent lock open tool
US4603740A (en) * 1984-08-29 1986-08-05 Hydril Company Subsurface safety valve
US4607710A (en) * 1984-08-31 1986-08-26 Norton Christensen, Inc. Cammed and shrouded core catcher
US4624315A (en) * 1984-10-05 1986-11-25 Otis Engineering Corporation Subsurface safety valve with lock-open system
US4574889A (en) * 1985-03-11 1986-03-11 Camco, Incorporated Method and apparatus for locking a subsurface safety valve in the open position
US4605070A (en) * 1985-04-01 1986-08-12 Camco, Incorporated Redundant safety valve system and method
US4676308A (en) * 1985-11-22 1987-06-30 Chevron Research Company Down-hole gas anchor device
US4723606A (en) * 1986-02-10 1988-02-09 Otis Engineering Corporation Surface controlled subsurface safety valve
US4796705A (en) 1987-08-26 1989-01-10 Baker Oil Tools, Inc. Subsurface well safety valve
EP0358086B1 (de) * 1988-09-03 1992-02-05 Akzo Faser Aktiengesellschaft Verfahren zur Erhöhung des Mesophasenanteils in Pech
US4951753A (en) * 1989-10-12 1990-08-28 Baker Hughes Incorporated Subsurface well safety valve
US4981177A (en) * 1989-10-17 1991-01-01 Baker Hughes Incorporated Method and apparatus for establishing communication with a downhole portion of a control fluid pipe
US4944351A (en) * 1989-10-26 1990-07-31 Baker Hughes Incorporated Downhole safety valve for subterranean well and method
US4967845A (en) * 1989-11-28 1990-11-06 Baker Hughes Incorporated Lock open mechanism for downhole safety valve
US5165284A (en) * 1990-04-05 1992-11-24 Matsushita Electric Industrial Co., Ltd. Pressure sensor utilizing a magnetostriction effect
US5442599A (en) * 1990-09-27 1995-08-15 National Time & Signal Corporation Impulse clock system
US5127476A (en) * 1991-05-10 1992-07-07 Jerry L. Wilson Lockout housing and sleeve for safety valve
US5293943A (en) * 1991-07-05 1994-03-15 Halliburton Company Safety valve, sealing ring and seal assembly
US5167284A (en) 1991-07-18 1992-12-01 Camco International Inc. Selective hydraulic lock-out well safety valve and method
US5165480A (en) 1991-08-01 1992-11-24 Camco International Inc. Method and apparatus of locking closed a subsurface safety system
US5249630A (en) * 1992-01-21 1993-10-05 Otis Engineering Corporation Perforating type lockout tool
US5314026A (en) * 1992-03-04 1994-05-24 Otis Engineering Corporation Landing nipple
US5226483A (en) * 1992-03-04 1993-07-13 Otis Engineering Corporation Safety valve landing nipple and method
US5343955A (en) 1992-04-28 1994-09-06 Baker Hughes Incorporated Tandem wellbore safety valve apparatus and method of valving in a wellbore
US5263847A (en) * 1992-05-01 1993-11-23 Ava International Corporation Subsurface tubing safety valve
US5353876A (en) * 1992-08-07 1994-10-11 Baker Hughes Incorporated Method and apparatus for sealing the juncture between a verticle well and one or more horizontal wells using mandrel means
US5313955A (en) * 1992-10-30 1994-05-24 Rodder Jerome A Pulmonary flow head
US5496044A (en) * 1993-03-24 1996-03-05 Baker Hughes Incorporated Annular chamber seal
US5598864A (en) * 1994-10-19 1997-02-04 Camco International Inc. Subsurface safety valve
US5564675A (en) * 1994-10-19 1996-10-15 Camco International Inc. Subsurface safety valve of minimized length
US5575331A (en) * 1995-06-07 1996-11-19 Halliburton Company Chemical cutter
US5810087A (en) * 1996-01-24 1998-09-22 Schlumberger Technology Corporation Formation isolation valve adapted for building a tool string of any desired length prior to lowering the tool string downhole for performing a wellbore operation
WO1998034005A1 (en) * 1997-02-03 1998-08-06 Bj Services Company, U.S.A. Deployment system and apparatus for running bottomhole assemblies in wells, particularly applicable to coiled tubing operations
US6059041A (en) * 1997-07-17 2000-05-09 Halliburton Energy Services, Inc. Apparatus and methods for achieving lock-out of a downhole tool
JP3988805B2 (ja) * 1997-10-02 2007-10-10 大日本スクリーン製造株式会社 基板搬送方法及びその装置
CN2310155Y (zh) * 1997-12-17 1999-03-10 李亚洲 水力式锚泄器
US6273187B1 (en) * 1998-09-10 2001-08-14 Schlumberger Technology Corporation Method and apparatus for downhole safety valve remediation
US6173785B1 (en) * 1998-10-15 2001-01-16 Baker Hughes Incorporated Pressure-balanced rod piston control system for a subsurface safety valve
US6433991B1 (en) * 2000-02-02 2002-08-13 Schlumberger Technology Corp. Controlling activation of devices
US6352118B1 (en) * 2000-03-30 2002-03-05 Halliburton Energy Services, Inc. System and method for communication hydraulic control to a wireline retrievable downhole device
US6619388B2 (en) * 2001-02-15 2003-09-16 Halliburton Energy Services, Inc. Fail safe surface controlled subsurface safety valve for use in a well
US6523614B2 (en) * 2001-04-19 2003-02-25 Halliburton Energy Services, Inc. Subsurface safety valve lock out and communication tool and method for use of the same
US20030173089A1 (en) * 2002-03-18 2003-09-18 Westgard David J. Full bore selective location and orientation system and method of locating and orientating a downhole tool
US6902006B2 (en) * 2002-10-03 2005-06-07 Baker Hughes Incorporated Lock open and control system access apparatus and method for a downhole safety valve

Also Published As

Publication number Publication date
GB0709884D0 (en) 2007-07-04
CN101493002B (zh) 2012-12-12
CA2636887A1 (en) 2004-05-27
US7409996B2 (en) 2008-08-12
CN101493002A (zh) 2009-07-29
AU2004288169A1 (en) 2005-05-19
WO2005045184A9 (en) 2005-07-21
GB2436230A (en) 2007-09-19
GB2436229B (en) 2008-05-28
AU2010246570A1 (en) 2010-12-23
CN1910337A (zh) 2007-02-07
GB0607289D0 (en) 2006-05-24
US20050098325A1 (en) 2005-05-12
GB2424912B (en) 2007-12-19
CA2636681A1 (en) 2005-05-19
CN1910337B (zh) 2011-10-05
CA2636887C (en) 2012-03-13
GB2436229A (en) 2007-09-19
AU2004288169B2 (en) 2011-01-20
GB2424912A (en) 2006-10-11
GB2436230B (en) 2008-02-27
CA2536900C (en) 2011-03-29
RU2370634C2 (ru) 2009-10-20
RU2006118155A (ru) 2007-12-20
AU2010246570B2 (en) 2011-10-06
GB0709883D0 (en) 2007-07-04
WO2005045184A1 (en) 2005-05-19
CA2536900A1 (en) 2005-05-19

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