Fluid pressure biased to open position position

Send this to a friend
321
This subclass is indented under subclass 319.  Devices in which fluid pressure acts on a surface of the valve to urge the valve to open position. The fluid acting on the valve may be the flow line fluid acting on surfaces of the valve of unequal areas or the fluid may be a control fluid distinct from the flow fluid.

 
Showing: 1-100 of 335
1
|
2
|
3
|
4
   
   
  Jump to Page:
Keywords to Highlight:
 
Patent Number
Title
  Date
3930540 Wellbore circulating valve Jan-6-1976
A wellbore circulating valve especially useful in a string of testing tools utilizes a sequentially ratcheted inner mandrel which covers a series of flow ports and is opened by a predetermined sequence of operations which move the mandrel away from the flow ports thereby communicating the annulus with...     
3937280 Artificial lift well apparatus Feb-10-1976
Artificial lift apparatus for use in a well having an outer pipe string for flow of a first fluid and an inner pipe string for flow of a second fluid. The apparatus may comprise a tubular receiver for connection in the inner pipe string and having ports for providing communication between the inner and...     
3958633 Flapper-type subsurface safety valve May-25-1976
This is a subsurface safety valve for insertion in a tubing string in a well drilled in the earth, normally for the production of oil and gas. This valve is lowered and retrieved by wireline and is seated in a special side-pocket mandrel which is a part of the tubing string. One suitable valve is a flapper-type,...     
3964305 Apparatus for testing oil wells Jun-22-1976
An annulus pressure operated oil well testing and sampling apparatus utilizes hydrostatic pressue to supplement spring means which biases against valve means to hold the valve means closed until application of sufficient hydraulic pressure to the annular fluid opens the tool to the formation and allows...     
3965980 Mud saver valve Jun-29-1976
A drilling mud saver valve connected to the lower end of a kelly allows down flow of mud or other drilling fluid when pumps are actuated to circulate drilling fluid, but closes when the pumps are off, thereby retaining drilling fluid thereabove in the kelly to prevent loss of fluid when the kelly and...     
3967647 Subsea control valve apparatus Jul-6-1976
A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a control unit releasably latched to a valve body having tandem, normally closed valve assemblies, the upper valve assembly including a flapper valve...     
3987848 Pressure-balanced well service valve Oct-26-1976
A well service valve used primarily for the injection of closely controlled batches of well treating fluids into low pressure formations utilizes a biased one-way flow valve in a tubing string to hold the treating fluid in the column until the tubing is pressurized to open the valve and expose flow ports...     
4005751 Deep well safety valve Feb-1-1977
A surface controlled, sub-surface well valve includes a main valve, a main valve actuator, and a control pressure responsive pilot valve to control application of control pressure to the actuator. The construction is such that the well valve is not affected by changes in pressure of the production flow,...     
4008760 Circulating valve Feb-22-1977
Disclosed is a circulating valve for use in a well. The circulating valve includes at least one valve plug initially blocking flow through the valve which moves to a retained position permitting flow through the valve upon the application of a predetermined pressure differential across the valve plug....     
4011906 Downhole valve for paraffin control Mar-15-1977
Method and apparatus for removing paraffin deposits from the production tubing of an oil well. A sub is series connected into the production string at a location below the area where deposition of paraffin occurs, and treatment fluid, such as hot water, is pumped downhole towards the inlet end of the...     
4014386 Subsurface safety valve apparatus Mar-29-1977
In accordance with an illustrative embodiment of the present invention, a subsurface safety valve assembly includes a dome precharged with a set reference pressure that tends to close the valve, and means responsive to both ambient pressure and to the pressure of a control fluid for holding the valve...     
4039031 Well control valve apparatus Aug-2-1977
Well control valve to be installed in a tubing string for use in killing a well through use of fluid under pressure pumped down through the annulus surrounding the tubing string. When the annulus pressure exceeds a predetermined value, the valve is opened to permit the kill fluid to flow into and through...     
4049052 Subsurface annulus safety valve Sep-20-1977
Disclosed is a safety system to control flow within a well which includes an annulus safety valve to control flow in the annulus between concentric well pipe and which may include a tubing safety valve to control flow in the inner pipe.
4069871 Deep well safety valve Jan-24-1978
A surface controlled, sub-surface well valve includes a main valve, a main valve actuator, and a control pressure responsive pilot valve to control application of control pressure to the actuator. The construction is such that the effects of excessive control pressure due to well depth are obviated.
4071088 Retrievable safety valve Jan-31-1978
A new and improved subsurface safety valve which is inserted into well tubing without requiring removal of the tubing, and which replaces worn, deteriorated and fully or partially inoperative safety valves in the well tubing to prevent blow-outs in wells. The replacement subsurface safety valve may be...     
4086935 Remote controlled tubing safety valve May-2-1978
A remote-controlled tubing safety valve having a check valve and a remotely controlled valve member operator movable between two positions. When the valve member operator is in a first position the check valve is maintained open. When the valve member operator is in a second position it does not interfere...     
4119146 Surface controlled sub-surface safety valve Oct-10-1978
A surface controlled subsurface safety valve having an operator and a pilot valve. The pilot valve controllably communicates pressurized control fluid to affect the operator and pressure balances the operator. This abstract is neither intended to define the scope of the invention, which, of course, is...     
4185806 Fluid material flow control valve Jan-29-1980
A fluid material flow control valve comprised of a conduit having an inlet end and an outlet end, and a remotely inflatable valving element disposed in the conduit between its inlet and outlet end such that the conduit can be variably opened to fluid flow by variably inflating the valving element and...     
4193449 Valve operating circuit Mar-18-1980
A hydraulic valve operating circuit for providing positive opening and closing of a downhole safety valve includes shut-off valves which prevent leakage of fuel to the outside environment if a leak should occur in the hydraulic lines which are connected to the hydraulic actuator of the downhole safety...     
4253525 Retainer valve system Mar-3-1981
In accordance with an illustrative embodiment of the present invention, a new and improved valve system for retaining production fluids in the subsea production pipe upon disconnection of the riser from the subsea wellhead during a production test of an offshore well includes a normally closed valve...     
4257484 Pressure differential circulating valve Mar-24-1981
Disclosed is a pressure differential circulating valve which can be connected to and form a portion of the tubing string disposed in casing for flow of fluid from a formation traversed by the casing and the tubing. Advantageously, the pressure differential circulating valve has an unrestricted passageway...     
4258786 Safety valve operating apparatus Mar-31-1981
A hydraulic valve operating circuit for providing positive opening and closing of a downhole safety valve includes shut-off valves which prevent leakage of fuel to the outside environment if a leak should occur in the hydraulic lines which are connected to the hydraulic actuator of the downhole safety...     
4262693 Kelly valve Apr-21-1981
A valve adapted for installation at the lower end of a drilling kelly for closing the bore of the kelly when adding a section of drill pipe so that the mud content of the kelly is not discharged onto the derrick floor; the valve also being adapted with minimum change in parts, to be inverted and installed...     
4289201 Well test apparatus Sep-15-1981
A well test apparatus in which a by-pass sleeve valve lands in a previously set packer. A lock mandrel assembly lands in the sleeve valve and carries a transducer fitting. A transducer is releasably carried in the fitting. Well conditions such as pressure may be sensed by the transducer and recorded...     
4294314 Inside blowout preventer well tool Oct-13-1981
An inside blowout preventer well tool includes an elongated body threaded at both ends and including an axial opening. A flapper is pivotally mounted on a side of the opening and movable between a lower-open position and an upper-closed position. A downwardly-facing valve seat is formed around the opening,...     
4324293 Circulation valve Apr-13-1982
A reverse circulation valve includes a cylindrical housing having an open longitudinal passageway disposed therethrough and a circulating port and a power port disposed through a wall thereof. A valve mandrel is slidably received in the housing and movable from a closed position closing the circulating...     
4325431 Flow controlling apparatus Apr-20-1982
There is disclosed a subsurface safety valve having a closure member which is yieldably urged to a position closing a bore through a mandrel connected as a part of a well tubing string, but adapted to be opened by means of a piston carried by a wire line retrievable tool landed within a pocket to one...     
4325434 Tubing shut off valve Apr-20-1982
A subsea test valve system for well completed at the floor of the sea includes a safety valve and disconnect mechanism mounted in a blowout preventer at the bottom of the sea and having hydraulic fluid pressure operated means for opening the safety valve and controlling a latch in the disconnect mechanism....     
4333828 Automatic dump valve Jun-8-1982
A valve for automatically dumping a load of solids entrained within a fluid transport medium in response to flow interruption is disclosed. The automatic dump valve is particularly well-suited for use in combination with a nodule transport riser in deep ocean mining operations. The automatic dump valve...     
4341266 Pressure operated test tool Jul-27-1982
A test tool is provided for testing the production capabilities of a preselected formation subsequent to the drilling of a subterranean well. The test tool is part of a testing string which incorporates a packer which may be releasably engaged in the casing string at a depth immediately above a region...     
4350205 Work over methods and apparatus Sep-21-1982
Methods and apparatus for isolating the producing zone of a well during workover operations, particularly where the well is equipped with a production string and a submersible electric pump suspended thereon. A packer and isolation valve are set in the well above the producing zone, and a hydraulically...     
4352366 Velocity operated standing valve Oct-5-1982
A standing valve for controlling fluid flow through a well flow conductor. The standing valve allows formation fluids to enter the flow conductor downhole and to flow in one directin to the well surface. The standing valve functions as a check valve to prevent fluids injected into the flow conductor...     
4354554 Well safety valve Oct-19-1982
A wire line removable well safety valve in an oil and gas well completion design including a tubing string, a well packer around the tubing string sealing with the well casing, and a submergible well pump on the tubing string below the packer. The safety valve controls flow of pumped well fluids through...     
4373582 Acoustically controlled electro-mechanical circulation sub Feb-15-1983
This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve...     
4391328 Drill string safety valve Jul-5-1983
A multi position safety valve retainable within an internal portion of a drill string casing (s) and responsive to the greater differential pressure in an internal fluid passage to displace a valve head (32) relative to a valve seat (VS) from its normal partially open position to either a wide open or...     
4403659 Pressure controlled reversing valve Sep-13-1983
In accordance with an illustrative embodiment of the present invention, a pressure controlled reversing valve for use in drill stem testing includes a housing having reversing ports that normally are closed by a valve sleeve that is mounted on a spring-loaded actuator mandrel, stop means for preventing...     
4407363 Subsurface well apparatus Oct-4-1983
There is disclosed a subsurface well completion system comprising body means having a bore therethrough adapted to be connected in axial alignment with a tubing string suspended within a well bore, and a packer carried by the body means for closing off the annulus above a production zone of the well....     
4407377 Surface controlled blade stabilizer Oct-4-1983
Drill string stabilizer apparatus, controllable to expand and retract entirely from the surface by control of drill string pressure, wherein increase of drill string pressure from the surface closes a valve to create a piston means which is moved down by drill string pressure to expand the stabilizer...     
4415027 Accumulator recharging valve Nov-15-1983
Accumulator recharging valve wherein a valve is opened to drain the accumulator, and then the accumulator is recharged through another valve, the valves being operated by pipe string pressure after blanking off the flow passage therethrough by a wireline tool, the valve operations being controlled by...     
4421182 Combination clean-out and drilling tool Dec-20-1983
A tool (10) is disclosed which permits clean-out of a bore hole in either a hydrostatic or hydraulic operation. In addition, the tool (10) may be used to drill a formation within the bore hole without the need for circulation of fluid to the surface to remove cuttings from the formation. The tool (10)...     
4422618 Remotely operated valve Dec-27-1983
A remotely operated valve, typically for use as a downhole safety valve, adapted to be connected in-line between two pieces of well pipe or other fluid-conducting members, the valve being rack-and-pinion operated and characterized by including a combined piston and rack member with the piston concentric...     
4423782 Annulus safety apparatus Jan-3-1984
A hanger and valve assembly which can be employed as a safety valve assembly to close both the production tubing and the tubing-casing annulus in a subterranean well is disclosed. The assembly includes a hydraulically activated, mechanically locked hanger which has slip anchoring members engaging the...     
4429747 Well tool Feb-7-1984
A ported sliding sleeve valve for use in a well tubing to provide a lateral flow path for transfer of fluids between the tubing and the annulus exterior thereof, the lateral ports of the device being initially closed by a port closure sleeve which is movable to port-opening position by increasing the...     
4434847 Flow controlling apparatus Mar-6-1984
There is disclosed apparatus for controlling flow through both a tubing string suspended within a well bore and the space within the well bore about the tubing string. The illustrated embodiment of the apparatus comprises a body made up of a pair of mandrels and having a first bore therethrough adapted...     
4440221 Submergible pump installation Apr-3-1984
A submergible pump installation for wells comprising a submergible pump assembly adapted to be landed in position within the well bore for pumping well fluids to the surface, together with a safety system for the well including a subsurface valve or valves for maintaining the well under control as the...     
4441558 Valve Apr-10-1984
A well system in which a dual annular type valve with wall flow ports, operable by ambient pressures, is utilized as part of the well tool string to provide an unrestricted flow path for production through and prevent excess back pressure on the producing formation. The valve has outside seals and internal...     
4444267 Ball valve housing Apr-24-1984
An improved valve member retention assembly comprising a cage assembly containing the lower valve seat and spherical valve member therein.
4445571 Circulation valve May-1-1984
A circulation valve includes a cylindrical housing having an open bore therethrough and a circulating port through a wall thereof. A valve mandrel is slidably received in the housing and movable from a closed position closing the circulating port to an open position opening the circulating port. The...     
4452310 Metal-to-metal high/low pressure seal Jun-5-1984
A dynamic metal-to-metal seal for use in a double acting piston and cylinder for use in high pressures and temperatures. First and second metal cup seals engage the piston and face in opposite directions for sealing against the cylinder wall whereby the higher pressure in the cylinder acting against...     
4475598 Ball valve actuating mechanism Oct-9-1984
The disclosure provides an actuating mechanism for a rotatable ball valve unit wherein several axially extending pistons and cylinder units or bellows elements are mounted in the wall of the outer housing of the ball valve in angularly spaced relationship. Two diametrically opposed piston or bellows...     
4485876 Valving apparatus for downhole tools Dec-4-1984
A valving apparatus supplies increased fluid pressure to a downhole tool having fluid pressure actuated expandable packing elements. The valving apparatus includes upper and lower annular sealing surfaces and a shuttle valve which, in its normal spring biased position, engages the upper sealing surface...     
4493373 Dynamic seal for well tools Jan-15-1985
A dynamic seal for use between reciprocal concentric tubular members is disclosed herein and is especially adaptable for use in providing a dynamic seal between a movable piston and a sleeve in a downhole oil or gas well tool, such as a safety valve, a hydraulically actuated packer or a sliding sleeve....     
4503913 Subsurface well safety valve Mar-12-1985
A subsurface control fluid pressure actuated well safety valve employs one or more spindles attached to the valve housing and spindle sleeves attached to a shiftable actuating flow tube. The spindles and spindle sleeves are positioned between the valve housing and the flow tube and a change in the pressure...     
4505341 Combination clean-out and drilling tool Mar-19-1985
A tool (10) is disclosed which permits retrieval of an object (201) from within a bore hole having debris (210) surrounding the object. The tool (10) includes an upper assembly (12) and a lower assembly (14). The upper assembly (12) is secured to a drill or tubing string assembly (16) extending to the...     
4520994 Sub-surface safety gate valve Jun-4-1985
A high pressure gate valve apparatus provides an elongated cylindrical valve body providing a fluid conveying linear cylindrical longitudinal bore of substantially uniform configuration. A gate valving member is movable within the valve body entirely within the confines of the valve body and not projecting...     
4527629 Pressure differential circulating valve Jul-9-1985
Disclosed is an improved pressure differential circulating valve which can be connected to and form a portion of the tubing string disposed in casing for flow of fluid from a formation traversed by the casing and the tubing or for other uses in well bores which has the following improvements: the valve...     
4538685 Locking annulus safety valve Sep-3-1985
An annulus subsurface safety valve for installation between inner and outer concentric members and controlling a fluid passageway therein in which the safety valve is locked to the outer member when the fluid passageway is closed. The outer member is provided with a threaded section and the safety valve...     
4552218 Unloading injection control valve Nov-12-1985
A valving apparatus for use in controlling the fluid pressure in a subterranean well conduit and in the annulus surrounding the conduit is disclosed. The valving apparatus is shiftable between a closed position and an open position allowing flow within the tubing by the application of fluid pressure...     
4552219 Subsurface safety valve Nov-12-1985
A tubing retrievable surface controlled subsurface safety valve having a rotatable ball-type flow closure element is disclosed. The ball element is rotationally operated and guided by a pair of guide members fixed in the valve by a stop ring. The guide members co-act with the ball to provide the desired...     
4553598 Full bore sampler valve apparatus Nov-19-1985
In accordance with an illustrative embodiment of the present invention, a full-bore sampler and safety valve apparatus includes a housing having an actuator mandrel slidably arranged therein, axially spaced normally open ball valve elements mounted on the mandrel assembly and cooperable with fixed eccentric...     
4569397 Ball valve actuating mechanism Feb-11-1986
The disclosure provides an actuating mechanism for a rotatable ball valve unit wherein several axially extending pistons and cylinder units or bellows elements are mounted in the wall of the outer housing of the ball valve in angularly spaced relationship. Two diametrically opposed piston or bellows...     
4569398 Subsurface well safety valve Feb-11-1986
A safety valve having a flow tube telescopically movable in the housing for controlling the opening and closing of the valve in which the housing has a fluid chamber with a piston connected to the flow tube and a fluid passageway connected to the chamber adapted to be in communication with the fluid...     
4576196 Unloading injection control valve Mar-18-1986
A valving apparatus for use in controlling the fluid pressure in a subterranean well conduit and in the annulus surrounding the conduit is disclosed. The valving apparatus is of the shuttle type and is shiftable between a closed position and an open position allowing flow within the tubing by the application...     
4576235 Downhole relief valve Mar-18-1986
A downhole relief valve connected to a tubing string in a producing well above the packer for controlling the well to prevent excess pressure built up in the annulus and casing damage following a tubing rupture at a point where the flowbore pressure exceeds the annulus pressure. The valve has a housing,...     
4577692 Pressure operated test valve Mar-25-1986
A pressure operated test valve for use in a well test string in a well bore is shown. The test string has a packer arranged for sealing the well bore to isolate the annulus between the well bore and the test string above the packer from that portion of the well bore below the packer. The test valve includes...     
4589482 Well production system May-20-1986
A well production system in which a submersible pump is utilized in producing the well and gas produced by the well is bypassed through a packer with a special control valve which is constructed and arranged to permit ready passage of sound waves through the valve to facilitate determining the fluid...     
4601341 Flexible piston well safety valve Jul-22-1986
A subsurface well safety valve having a housing with a valve closure member which is controlled by a flow tube which includes an improved hydraulic actuating mechanism. The housing includes a cylinder with a straight portion and a curved portion which is adapted to receive hydraulic fluid from the surface...     
4602684 Well cementing valve Jul-29-1986
A well cementing valve is shown which includes a tubular mandrel having at least one lateral port and which is adapted to be made in a well tubing string. An external seal ring having a seal region circumscribes the mandrel on one side of the lateral port. An axially movable sleeve valve initially covers...     
4617999 Downhole tool with compression chamber Oct-21-1986
A downhole tool apparatus has a housing with a compression chamber defined therein. A fill passage is disposed through the housing for placing the compression chamber in open flow fluid communication with a well annulus so that well fluid may flow into the compression chamber as the apparatus is lowered...     
4620597 High pressure injection valve Nov-4-1986
Disclosed is a bellows control valve with means to pressurize the bellows chamber to very high pressure without creating a significant detrimental differential pressure across the bellows.
4624310 Well apparatus Nov-25-1986
A well system employs a pump to lift liquid through a primary tubing and subsurface safety valve. The tubing passes through a packer and a vent valve vents gas from the well through the packer. The power transfer means may extend through the vent valve and the vent valve may also control a cross-over...     
4632184 Submersible pump safety systems Dec-30-1986
A pump produces through a tubing in a cased well. Gas is vented through the packer and through a valve preferably located in a side pocket mandrel in the tubing. A subsurface safety valve is positioned in the tubing below the side pocket mandrel and preferably below the packer. The safety valve is preferably...     
4651829 Subsurface control valve Mar-24-1987
A full opening subsurface control valve for use in subsurface closure of a well annulus. The valve includes a body with a sleeve reciprocably disposed in the valve body. The body is releasably attached to an upper tool string portion, and the sleeve is attached to a lower tool string portion. An actuator...     
4660646 Failsafe gas closed safety valve Apr-28-1987
A subsurface well safety valve having a flow tube telescopically movable in a housing for controlling the movement of a valve closure member. A piston and cylinder assembly actuates the flow tube and is in communication with hydraulic control fluid from the well surface on one side and a gas biasing...     
4669547 High temperature subsurface safety valve Jun-2-1987
A subsurface safety valve for controlling the fluid flow through a well conduit having an improved fluid actuator with a ceramic piston connected to and actuating the valve and movable in a ceramic sleeve. The actuator metal valve seats and metal valve elements for seating on the valve seats for providing...     
4691779 Hydrostatic referenced safety-circulating valve Sep-8-1987
An annulus pressure responsive downhole tool includes a housing with an operating element disposed in the housing. The operating element is movable from a first element position to a second element position relative to the housing. A hydrostatic well annulus pressure referenced annulus pressure responsive...     
4711301 Valve assembly for inflatable packer Dec-8-1987
A multi-function valve assembly for controlling fluid flow through a single cavity, the valve assembly being particularly suited for use with an inflatable packer in a well bore. The valve assembly includes a control valve sliding piston in one end of a cavity such as a cavity in an inflatable packer,...     
4712613 Down-hole blow-out preventers Dec-15-1987
A down-hole blow-out preventer has a housing (10) which is engageable in a drill string and which has a ball-valve (13) pivotally mounted in the bore (11) of the housing. The ball-valve is rotated from an open to a closed position by means of a cooperating cam sleeve (20) which is moved downwardly when...     
4721132 Subsea flowline quick disconnect coupling Jan-26-1988
A quick disconnect coupling for a subsea well flowline has valves that open and close when the coupling is made up and released. The coupling has tubular upper and lower connectors, each with a flow passage. The upper connector inserts over a mandrel of the lower connector. Ball valves are located in...     
4721162 Fluid level controlled safety valve Jan-26-1988
A well safety valve for use in a fluid well conduit through which fluid is produced by pumping. A body is adapted to be inserted into the conduit and includes a passageway for well fluid. A valve in the passageway opens and closes in response to the fluid level or hydrostatic pressure in the conduit....     
4732211 Annulus pressure operated vent assembly Mar-22-1988
A vent subassembly includes a vent body having an opening which is covered or uncovered dependent upon the location of a vent sleeve relative to the vent body. The vent subassembly can be connected below a packer, and the vent sleeve can be connected to a perforator so that movement of the vent sleeve...     
4738431 Ball valve structure Apr-19-1988
Disclosed is an improved ball valve structure and a well safety valve utilizing the improved ball valve. The improved valve includes a metal seat member having a resilient section and control arms, which may be positioned to initially sealingly engage the seat with the ball and to compress the seat resilient...     
4749043 Subsurface safety valves and seals Jun-7-1988
Subsurface safety valves of the tubing and wireline retrieveable types operated by a control fluid responsive annular piston in an annular cylinder sealed at opposite ends by a two-way static and dynamic metal-to-metal seal assembly which includes central Bellville loading washers, a spacer ring on each...     
4753292 Method of well testing Jun-28-1988
A method of well testing, including treating, whereby a testing string including a tool bore closure valve is run into the well bore with the valve in an open mode, the string may be automatically filled, a packer may be pressure tested without cycling the tool bore closure valve, and fluids may be spotted...     
4766960 Standing and injection valve Aug-30-1988
Standing valves which may be operated as injection valves without removal from a well conduit are disclosed. All disclosed valves permit upward production flow and prevent downward injection flow. One valve form utilizes a ball valve to control production and injection flow, and two valve forms utilize...     
4771831 Liquid level actuated sleeve valve Sep-20-1988
A tubing retrievable, hydrostatically operated liquid sleeve valve to control and shut off well production to the well surface of a producing well. The sleeve valve includes a port for supplying production fluid through the well annulus for pumping. When the pump stops, the liquid level in the annulus...     
4776400 Oil-well flap-type safety valve Oct-11-1988
An oil-well safety valve comprising a movable shutter flap, an inner tubular slide, a return spring for the slide, hydraulic means displacing the slide downward by pressuring a control fluid and a system for anchoring the valve in a receiving sleeve, the flap hinging on a shutter body (108) screwed on...     
4796705 Subsurface well safety valve Jan-10-1989
In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating...     
4800958 Annulus pressure operated vent assembly Jan-31-1989
A vent subassembly includes a vent body having an opening which is covered or uncovered dependent upon the location of a vent sleeve relative to the vent body. The vent subassembly can be connected below a packer, and the vent sleeve can be connected to a perforator so that movement of the vent sleeve...     
4834183 Surface controlled subsurface safety valve May-30-1989
A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, an annular piston on the operator tube responsive to control fluid pressure conducted from the well surface, and a spring biasing the operator...     
4846272 Downhole shuttle valve for wells Jul-11-1989
A downhole flow testing valve having a tubular housing with a valve and flow tube movable within the housing between an open position where valve ports therein are positioned in registry and a closed position where the valve ports are out of fluid communicating registry. The valve and flow tube is closed...     
4848457 Annulus sliding sleeve valve Jul-18-1989
An annulus valve for a well concentric tubing hanger has features to prevent damage to the seals. The annulus valve has a closure sleeve that when moved to an open position, communicates fluid from an annulus between casing and tubing to a point above the tubing hanger. The lower end of the closure sleeve...     
4890674 Flapper valve protection Jan-2-1990
An improved subsurface safety valve has a flapper plate which is held open by an operator tube, and which can be closed rapidly during high flow operating conditions without damage to the flapper plate or to the operator tube. The operator tube is telescopically coupled within a tubular piston. Retraction...     
4903774 Annulus shut-off mechanism Feb-27-1990
An annulus shut-off mechanism with fail-as-is logic suitable for use for example, in a concentric tubing hanger of an oil well, particularly a sub-sea well, has an enclosure across the annulus with inlet and exit ports, a sleeve with an aperture that slides within the enclosure, primary means for sliding...     
4945993 Surface controlled subsurface safety valve Aug-7-1990
A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, a small diameter offset piston to move the operator tube in response to control fluid pressure conducted from the well surface, and a spring...     
4951753 Subsurface well safety valve Aug-28-1990
In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating...     
4962812 Valving system for inflatable packers Oct-16-1990
Existing inflatable packers employ a three valve system for controlling the application of tubing pressure to the interior of an inflatable packing element surrounding the tubing. The three valves of such system are disposed in chordal relationship in the tubular wall of a valve collar which is secured...     
4976317 Well tool hydrostatic release means Dec-11-1990
A release mechanism for use in a well tool that requires a hydraulic piston area to be equalized with a minimum force. A valve seat and valve element are positioned in a fluid passageway for actuating the assembly. A rod having a first and second section is connected to the assembly and movable for moving...     
5004007 Chemical injection valve Apr-2-1991
An improved surface controlled chemical injection valve and method for injecting chemical fluid into the bore of a tubing string of a well are provided, the chemical injection valve having at least one piston movable in response to the pressure of the chemical fluid, an actuator connected to the piston,...     
5040606 Annulus safety valve Aug-20-1991
A fail safe annulus valve for fluids has a valve area across the annulus with inlet and exit ports and a slide valve in the area capable of sliding to open or close the ports. The slide valve is biased to its fail safe position by a spring, is susceptible to being opened by independent pressure apparatus,...     
Add to folder:
View Folders
Showing: 1-100 of 335
1
|
2
|
3
|
4
   
   
  Jump to Page: