US3780809A - Method and apparatus for controlling wells - Google Patents

Method and apparatus for controlling wells Download PDF

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Publication number
US3780809A
US3780809A US3780809DA US3780809A US 3780809 A US3780809 A US 3780809A US 3780809D A US3780809D A US 3780809DA US 3780809 A US3780809 A US 3780809A
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United States
Prior art keywords
valve
flow
conduit
flow period
fluid
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Expired - Lifetime
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English (en)
Inventor
R Ayers
J Lloyd
W Loth
J Bayless
J Graham
R Williams
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ExxonMobil Upstream Research Co
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Exxon Production Research Co
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    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/16—Control means therefor being outside the borehole
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/108—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole with time delay systems, e.g. hydraulic impedance mechanisms
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/04—Ball valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer

Definitions

  • the apparatus includes a subsurface valve situated on the conduit and provided with means for actuating the valve between an open and closed position to control the flow of fluid through the conduit.
  • the valve automatically closes at the end of a preset flow period unless reset in response to an external signal to reinitiate the predetermined period to closure.
  • a surface generated signal as for example a pressure pulse, is periodically directed to the actuating means to reinitiate the flow period.
  • the frequency of the pulses is adjusted as required to assure that the actuating means will receive a pulse prior to the end of the flow period so flow will not be interrupted. If the pulses are interrupted, as for example by a rupture in the well conduit, the valve will close automatically at the end of the flow period.
  • valves together with a hydraulic actuator is installed downhole in the well conduit.
  • a hydraulic control conduit extends from the valve actuator to the surface along the exterior of the well conduit so that it will not impair movement of tools through the inner bore.
  • These valves are generally maintained open hydraulically and close in response to a drop in hydraulic pressure in a control line or similar conduit.
  • This type system has the advantage that the valve can be positively controlled from the surface, may be tested safely, and requires no reserve producing capacity. Because of the external hydraulic fluid line, however, it has the disadvantage of requiring more space than a velocity-actuated valve.
  • the present invention provides a subsurface safety valve which requires no mechanical connection to the surface and alleviates the problems outlined above.
  • the improved subsurface safety valve of the invention is useful primarily in controlling the flow of fluid through a conduit within a well for the production of crude oil or natural gas.
  • the improvement comprises a means for actuating the valve which maintains the valve open throughout the duration of a preset flow period and automatically closes the valve at the end thereof unless the actuating means is set by an intervening external signal to reinitiate the preset flow period prior to closure.
  • the span of the predetermined flow period may, for example, be defined by a specific time interval or by a particular volume of fluid.
  • the external signal used to reset the device is preferably a surface generated pressure pulse which is transmitted through a well fluid.
  • the present method involves producing a well through a conduit including a safety valve constructed .in accordance with the invention and periodically generating a signal at the earths surface which is detectable at the valve and serves to reinitiate the flow period of the valve acutator.
  • the frequency of the pulses is adjusted as required to pulse the valve prior to termination of the flow interval, and thereby prevent the valve from closing.
  • the periodic signals are interrupted so that the valve closes at the end of the flow period.
  • the valve is reopened by increasing the pressure within the conduit above the valve to a level in excess of that below it.
  • the method and apparatus of the invention require no mechanical linkage between the valve and the surface, can be run and removed with wireline tools, can be tested on a rountine basis, and can automatically shut in wells in the absence of intennittent signals from the surface. It will therefore be apparent that the present invention offers significant advantages over systems available heretofore.
  • FIG. 1 is a schematic of the subsurface safety valve system of the invention.
  • FIG. 2 is a cross-sectional elevation view of a valve assembly constructed in accordance with the present invention in its open position.
  • FIG. 3 shows the apparatus of FIG. 2 with the valve in its closed position.
  • FIG. 4 is a schematic of electric componentry which can be used with the valve assembly shown in FIGS. 2 and 3.
  • FIG. 5 is a schematic of another embodiment of a safety valve constructed in accordance with the present invention in its open position.
  • FIG. 6 is a schematic of the system of FIG. 5 showing the flow interval timer being reset to its initial position.
  • FIG. 7 schematically depicts the system of FIG. 5 with the valve in the closed position.
  • FIG. 1 is a schematic elevation of the subsurface safety valve system of the present invention.
  • the system shown includes a well conduit 11 extending from the top of offshore platform 12 into a borehole in the floor 13 of the body of water 14.
  • the lower end of the conduit is in communication with a producing formation.
  • Surface equipment for controlling flow of produced fluid includes a manually controlled master valve and a flow control device 16, as for example a pressure actuated motor valve, situated on the well conduit.
  • a controller 17 for regulating the position of the flow control device is also shown. This may comprise a source of high pressure gas together with a timing device.
  • Downhole equipment includes safety valve 18 coupled with an actuator 19.
  • valve actuator and valve are normally enclosed within an l7 can be 'set to periodically actuate a valve or other flow control device to restrict flow and thus create a pressure pulse in the well conduit.
  • a pressure responsive means situated downhole on the valve actuator will respond to this pulse by resetting the flow interval to zero and restarting the-flow period to closure so that flow continues uninterrupted.
  • the controller at the surface is adjusted to omit the periodic pressure pulse. This results in the downhole actuator receiving no signal and closing the valve after the duration of the predetermined flow interval. Similarly, in the event the well casing is severed or severely damaged, the actuator will receive no reset signal and the valvewill automatically close, shutting in the well.
  • the safety valve is preferably a normally closed device.
  • a full opening ball valve is preferred, but numerous other closure devices would be satisfactory for use with the system. It will generally be most convenient to employ surface generated pressure fluctuations in the flow stream to signal the downhole actuator; however, other systems, as for example, acousitc, electrical or radio signal could be used.
  • the longevity of the flow period prior to closure is variable within wide limits consistent with the present invention. It is preferred, however, that a relatively short flow interval be employed. When the flow period is defined in terms of time or fluid volume, this has the advantage of reducing substantially the volume of flow through the conduit between loss of well control due to damage and subsequent closure of the valve. A number of devices for controlling the duration of the flow interval will be readily apparent. The preferred systems are, however, responsive to either elapsed time or to the cumulative volume of fluid flowing through the safety valve.
  • FIG. 2 and 3 are cross-sectional elevation views of one configuration of safety valve exemplary of the apparatus of the present invention.
  • the apparatus shown includes an outer housing 21 having seals 10 and expansible dogs situated on the upper exterior to permit it to be anchored within the well conduit against vertical movement and sealed against circumferential flow.
  • a slidable cylindrical mandrel 22 is disposed within the outer housing.
  • a ball 23 having an aperture 23A therethrough is rotatably mounted within the lower interior of the mandrel. The ball engages the outer housing by means not shown so that as the mandrel slides from the lower position, FIG. 2, to the upper, FIG. 3, the ball rotates from the open to the closed position.
  • the mandrel is biased toward the upper position by compressed spring 24 situated between the outer flange 25 of the mandrel and the inner shoulder 26 of the outer housing.
  • Spring-biased latch 27 extends inwardly whenever its compressed spring is permitted to expand, FIG. 2, and is locked in place above the mandrel by solenoid actuated locking member 29 to block it against movement so that the valve remains open.
  • the spring-loaded mandrel slides upwardly forcing the latch into its receptacle within the outer housing and closing the valve, as shown in FIG. 3.
  • Valve closure is assisted by differential pressure exerted by the flowing well stream.
  • Spring-biased ball detent 28 engages a recess 28A in the outer housing when the mandrel is fully extended.
  • the actuator is adpated to close the valve at the end of a preset flow period unless an intervening external signal is received which resets the actuator and causes it to reinitiate the flow period, thereby deferring closure for the span of an additional flow interval.
  • the actuator closes the subsurface valve by unlocking latch 27 which when extended and locked into place restrains springbiased mandrel 22 in its lower position to keep the valve open.
  • Position of the lock on latch 27 may for example be controlled by a solenoid designed to fail safe. Solenoid 20 when energized, forces locking member 29 downward, overcoming spring 298 to hold latch 27 in place. Whenever the solenoid is deenergized, spring 298 forces the locking memberupward, causing the valve to close.
  • Electrical or electronic componentry associated with the valve may be mounted within the wall of outer housing 21, as for example within the circumferential housing designated by numeral 30 in the drawings.
  • This will normally include a source of electric power, as for example, a battery or turbine generator, to provide energy for the solenoid and associated control circuitry.
  • the latter includes a pressure sensitive device in communication with the inner bore of the valve housing.
  • This device which may for example be a pressure transducer or pressure switch, is actuated in response to a pressure condition within the section of the well conduit above the valve, as might be created by restricting flow or by shutting the well in at the surface for a brief interval.
  • the pressure-sensitive device acts in combination with a timer or similar device for indicating the termination of the predetermined flow period.
  • the signal from the pressure sensitive device serves to reset the timer and reinitiate the timed interval, permitting deferral of termination of the flow period and thereby maintaining the valve open for an additional flow period.
  • FIG. 4 is a schematic diagram of componentry which can be used for this purpose. Shown is a battery 31 -which provides a source of power for a circuit including resistor 32, solenoid 29A, and capacitor 42. As capacitor 42 charges, the voltage across resistor 32 and solenoid 29A decreases until a point is eventually reached at which the voltage drop across the solenoid is insufficient to hold locking pin 29 against spring 298. This permits the spring to lift the locking pin which in turn results in closure of the valve. The flow period to closure is governed by the time period required to charge the capacitor to the critical level and can be varied by changing the resistance of resistor 32. A normallyopen pressure switch 43, which closes in response to a pressure increase, is situated in a second circuit which also includes capacitor 42.
  • the valve is normally reopened by increasing pressure within the well conduit to a level above that which exists within the portion of the conduit situated beneath the valve. This increase actuates the pressure sensor which closes the pressure switch discharging the capacitor and reinitiating the timed flow cycle. Discharging the capaci tor permits sufficient current to again flow through the solenoid to cause it to force locking-pin 29 downward.
  • the locking member will, however, be temporarily restrained from movement by spring-biased latch 27, which is temporarily blocked against movement'by the exterior of the mandrel until such time as the differential pressure across the valve depresses the mandrel to its open position. With the mandrel depressed the latch extends inwardly and is locked in place to hold the valve open.
  • FIGS. 5, 6 and 7 depict schematically another embodiment of the apparatus of the present invention. It will be understood that the arrangement of the structural elements shown in the drawing is for convenience of illustration only and that the entire system shown would normally be arranged such that it could be conveniently enclosed within a wireline retrievable outer housing.
  • the apparatus includes a valve body 33 having an inner extending cylindrical bore 34.
  • a conduit 35 with an external circumferential shoulder 36 is slidably disposed within the bore of the valve body, dividing it into an upper chamber 37 and lower chamber 38 separated by the slidable piston formed by shoulder 36.
  • the lower end of the conduit is closed, as by means of a cap 39, but the conduit has two lateral ports designated by numeral 40 for admitting fluid.
  • the upper end of the conduit is open, completing the flow path through the valve body.
  • the position occupied by the piston, and thus the operating position of the valve, is controlled by the pressure differential between the upper and lower chambers positioned above and below the piston, respectively. It will normally be desired to include a biasing means, for example compressed spring 36A on the underside of the piston, to assure that the valve will close in the event of failure of hydraulic circuitry.
  • Well pressures routed by a pilot valve designated generally by numeral 50 provide the pressure differentials required to operate the valve.
  • the pilot valve typically includes a cylindrical housing 51 within which a pilot piston 52 is slidably disposed.
  • the pilot piston has two pairs of unconnected flow paths extending therethrough.
  • the lower pair, numbered 53 and 54, are arranged horizontally for straight-through flow.
  • Theupper pair, numbered 55 and 56, have crossed paths of flow which are independent of one another.
  • the cylindrical housing enclosing the pilot valve includes two corresponding pairs of ports extending therethrough. One pair issituated on each side and they are arranged for alignment with the ends of either the crossed or the horizontal pair of flow paths, depending on the position of the pilot piston within the cylinder.
  • a high pressure fluid conduit, designated by numeral 57, leads form a well conduit port situated below the valve to high pressure source port 58 of the pilot valve cylinder.
  • Low pressure conduit 59 extends from a well conduit port positioned above the valve to low pressure source port 60 on the pilot cylinder.
  • Upper chamber conduit 61 and lower chamber conduit 62 connect the chambers above and below the valve piston to upper and lower chamber ports on the pilot cylinder designated by numerals 63 and 64 respectively.
  • a spring 65 or other biasing means acts to bias the pilot piston downwardly so that it tends to stay in the crossed configuration.
  • the position of the pilot piston (and the valve) is governed by displacement of a spring-biased actuator piston.
  • This pilot actuating piston is designated by numeral in the drawing and is shown slidably disposed within a cylinder 71.
  • a spring 72 is disposed within the actuator cylinder above the piston and compresses to bias it against upward movement.
  • the actuator piston is otherwise free to travel up or down within its cylinder, depending on the differential pressure acting across it.
  • a rod 73 attached to the lower end of pilot piston 52 extends from thee pilot cylinder through openings provided with suitable seals into the upper end of the actuator cylinder.
  • control fluid which may for example, be a hydraulic fluid
  • This control fluid is disposed within the chamber situated aboveand below the actuator piston.
  • the chamvber beneath the piston is in communication with a lower chamber having a distensible member 75 therein, separating the control fluid from the fluid contained within high pressure fluid conduit 61.
  • the chamber above the. actuator piston is in communication with a similar upper chamber also having a distensible member therein, designated by numeral 76, but separating the control fluid therein from the fluid within the low pressure fluid conduit 62.
  • a directional flow restriction 77 is included in the flow path between the two distensible members and is arranged to severely restrict flow from the chamber in pressure communication with the high pressure conduit to the chamber in pressure communication with the low pressure conduit.
  • the valve is open (FIGS. and 5) and pressure below it exceeds that above it, the flow of control fluid is impeded, retarding substantially the rate of ascent of the actuator piston.
  • the directional flow restriction permits unimpeded flow in the opposite direction.
  • this flow interval timer is responsive to the product of pressure differential and elapsed time which is in turn proportional to cumulative fluid flow through the valve.
  • the closed valve may subsequently be reopened by increasing the pressure within the well conduit above the valve. Once the pressure above approaches that below the valve, the springs biasing the actuator piston and the pilot piston will force them downward, depressing the pilot piston to the crossed flow path configuration. Thereafter, reduction of the pressure above the valve to a level below that existing under the valve will then cause the differential pressure across the valve piston to open the valve.
  • a subsurface valve for controlling the flow of fluid through a well conduit, the improvement comprising means for actuating the valve between open and closed positions at the end of a preset flow period and means responsive to an external signal received prior to the end of said flow period for resetting said actuating means to reinitiate said preset flow period prior to actuation.
  • said actuating means includes a timer for determining the span of said flow period.
  • said actuating means includes a differential pressure actuated means for determining the span of said flow period prior to actuation.
  • said actuating means includes a means responsive to pressure within said well conduit for resetting same.
  • a safety device for controlling flow of a well fluid through a vertical conduit within a well extending beneath the surface of the earth which comprises a subsurface valve adapted to bedisposed within said conduit and provided with means for urging the valve towards a closed position, means for holding said valve open until the end of a preselected flow period, and means responsive to an external signal received prior to the end of said flow period for reinitiating said preset flow period prior to valve closure.
  • the apparatus of claim 6 including a timer for determining the span of said flow period.
  • the apparatus of claim 6 including a differential pressure-actuated means for determining the span of said flow period.
  • a safety device for controlling flow of a well fluid being produced through a conduit within a well extending beneath the surface of the earth which comprises:
  • a subsurface valve configured to be disposed within said conduit and adapted in a closed position to stop said flow of well fluid
  • d. means responsive to an external signal received prior to the end of said flow period for reinitiating said preset flow period prior to valve closure.
  • said actuator means includes a timer for determining the span of said flow period prior to actuation.
  • said actuator means includes a differential pressure actuated means for determining the span of said flow period prior to actuation.
  • a safety device for controlling flow of a well fluid being produced through a conduit within a well extending beneath the surface of the earth which comprises:
  • a method for regulating the flow of fluid within a well conduit extending beneath the earths surface comprising:

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  • 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)
  • Control Of Fluid Pressure (AREA)
  • Flow Control (AREA)
  • Fluid-Driven Valves (AREA)
US3780809D 1972-04-12 1972-04-12 Method and apparatus for controlling wells Expired - Lifetime US3780809A (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850238A (en) * 1972-10-02 1974-11-26 Exxon Production Research Co Method of operating a surface controlled subsurface safety valve
US3901315A (en) * 1974-04-11 1975-08-26 Del Norte Technology Downhole valve
US3967680A (en) * 1974-08-01 1976-07-06 Texas Dynamatics, Inc. Method and apparatus for actuating a downhole device carried by a pipe string
US3993136A (en) * 1975-08-25 1976-11-23 Hydril Company Apparatus for operating a closure element of a subsurface safety valve and method of using same
US4515219A (en) * 1983-09-19 1985-05-07 Halliburton Company Low pressure responsive downhole tool with floating shoe retarding means
US4796699A (en) * 1988-05-26 1989-01-10 Schlumberger Technology Corporation Well tool control system and method
EP0450207A1 (en) * 1988-07-06 1991-10-09 Fontan Limited Downhole drilling tool system
EP0500341A1 (en) * 1991-02-20 1992-08-26 Halliburton Company Downhole tool apparatus actuatable by pressure differential
US5149984A (en) * 1991-02-20 1992-09-22 Halliburton Company Electric power supply for use downhole
EP0524042A1 (fr) * 1991-07-16 1993-01-20 Institut Francais Du Petrole Dispositif actionné par pression hydrostatique de fluide de forage
WO1994000709A1 (en) * 1992-06-24 1994-01-06 Exploration & Production Services (North Sea) Limited Pressure relief valve
RU2124635C1 (ru) * 1998-02-16 1999-01-10 Вяхирев Рем Иванович Способ определения минимального дебита, обеспечивающего вынос пластовой жидкости с забоя газовых и газоконденсатных скважин
WO2000053885A3 (en) * 1999-03-08 2002-01-31 Weatherford Lamb Downhole apparatus
US6384738B1 (en) 1997-04-07 2002-05-07 Halliburton Energy Services, Inc. Pressure impulse telemetry apparatus and method
US6388577B1 (en) 1997-04-07 2002-05-14 Kenneth J. Carstensen High impact communication and control system
GB2369842A (en) * 2000-12-08 2002-06-12 Schlumberger Holdings Debris-free valve apparatus
US6732803B2 (en) 2000-12-08 2004-05-11 Schlumberger Technology Corp. Debris free valve apparatus
US20070056745A1 (en) * 2005-09-14 2007-03-15 Schlumberger Technology Corporation System and Method for Controlling Actuation of Tools in a Wellbore
US20080087438A1 (en) * 2003-09-24 2008-04-17 Balen Robert M Self-propelled swabbing device and method
US20090126936A1 (en) * 2003-11-05 2009-05-21 Drilling Solutions Pty Ltd Actuating mechanism
US20100212882A1 (en) * 2009-02-24 2010-08-26 Schlumberger Technology Corporation Linearly actuated hydraulic switch
US20120234558A1 (en) * 2011-03-19 2012-09-20 Halliburton Energy Services, Inc. Remotely operated isolation valve
US20140202768A1 (en) * 2013-01-18 2014-07-24 Weatherford/Lamb, Inc. Bidirectional downhole isolation valve
US9273535B1 (en) * 2014-11-18 2016-03-01 Geodynamics, Inc. Hydraulic flow restriction tube time delay system and method
US10036230B2 (en) 2014-11-18 2018-07-31 Geodynamics, Inc. Hydraulic flow restriction tube time delay system and method
US10221656B2 (en) * 2013-12-31 2019-03-05 Sagerider, Incorporated Method and apparatus for stimulating multiple intervals
US11502763B2 (en) 2015-10-23 2022-11-15 Sharp Kabushiki Kaisha Method for signaling, method for receiving, signaling device, and receiving device
US20220381099A1 (en) * 2021-05-28 2022-12-01 National Oilwell Varco Norway As Liner hanger running tool
US20230212925A1 (en) * 2021-12-30 2023-07-06 Halliburton Energy Services, Inc. Pressure-activated valve assemblies and methods to remotely activate a valve
US12258840B1 (en) * 2023-08-29 2025-03-25 Saudi Arabian Oil Company Sub-surface safety valve with energy harvesting system and wireless activation

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US4202368A (en) * 1978-03-13 1980-05-13 Baker Cac, Inc. Safety valve or blowout preventer for use in a fluid transmission conduit

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US1886009A (en) * 1931-11-23 1932-11-01 Continental Oil Co Device for preserving natural gas pressure in oil wells
US1961280A (en) * 1933-07-11 1934-06-05 Phillips Petroleum Co Method and apparatus for controlling oil wells
US3018828A (en) * 1957-07-15 1962-01-30 Phillips Petroleum Co Prevention of water and gas coning
US3120267A (en) * 1960-12-05 1964-02-04 Jersey Prod Res Co Fluid flow control in wells
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US3357490A (en) * 1965-09-30 1967-12-12 Mobil Oil Corp Apparatus for automatically introducing coolant into and shutting down wells

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850238A (en) * 1972-10-02 1974-11-26 Exxon Production Research Co Method of operating a surface controlled subsurface safety valve
US3901315A (en) * 1974-04-11 1975-08-26 Del Norte Technology Downhole valve
US3967680A (en) * 1974-08-01 1976-07-06 Texas Dynamatics, Inc. Method and apparatus for actuating a downhole device carried by a pipe string
US3993136A (en) * 1975-08-25 1976-11-23 Hydril Company Apparatus for operating a closure element of a subsurface safety valve and method of using same
US4515219A (en) * 1983-09-19 1985-05-07 Halliburton Company Low pressure responsive downhole tool with floating shoe retarding means
US4796699A (en) * 1988-05-26 1989-01-10 Schlumberger Technology Corporation Well tool control system and method
EP0344060A3 (en) * 1988-05-26 1992-07-08 Societe De Prospection Electrique Schlumberger Well tool control system and method
EP0450207A1 (en) * 1988-07-06 1991-10-09 Fontan Limited Downhole drilling tool system
EP0500341A1 (en) * 1991-02-20 1992-08-26 Halliburton Company Downhole tool apparatus actuatable by pressure differential
US5149984A (en) * 1991-02-20 1992-09-22 Halliburton Company Electric power supply for use downhole
EP0524042A1 (fr) * 1991-07-16 1993-01-20 Institut Francais Du Petrole Dispositif actionné par pression hydrostatique de fluide de forage
FR2679293A1 (fr) * 1991-07-16 1993-01-22 Inst Francais Du Petrole Dispositif d'actionnement associe a une garniture de forage et comportant un circuit hydrostatique en fluide de forage, methode d'actionnement et leur application.
US5310012A (en) * 1991-07-16 1994-05-10 Institut Francais Du Petrole Actuating device associated with a drill string and comprising a hydrostatic drilling fluid circuit, actuation method and application thereof
WO1994000709A1 (en) * 1992-06-24 1994-01-06 Exploration & Production Services (North Sea) Limited Pressure relief valve
US5501242A (en) * 1992-06-24 1996-03-26 Expro North Sea Limited Pressure relief valve
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Also Published As

Publication number Publication date
JPS4917302A (OSRAM) 1974-02-15
DE2317645A1 (de) 1973-10-31
FR2179974B1 (OSRAM) 1977-02-04
NL7304987A (OSRAM) 1973-10-16
FR2179974A1 (OSRAM) 1973-11-23
CA969093A (en) 1975-06-10

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