| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 166321000 | Fluid pressure biased to open position position | 55 |
| 20090014183 | INJECTION VALVE AND METHOD - The present invention generally relates to controlling the flow of fluids in a wellbore. In one aspect, a valve for selectively closing a flow path through a wellbore in a first direction is provided. The valve includes a body and a piston surface formable across the flow path in the first direction. The piston surface is formed at an end of a shiftable member annularly disposed in the body. The valve further includes a flapper member, the flapper member closable to seal the flow path when the shiftable member moves from a first position to a second position due to fluid flow acting on the piston surface. In another aspect, a valve for selectively closing a flow path through a wellbore in a single direction is provided. In yet another aspect, a method for selectively closing a flow path through a wellbore in a first direction is provided. | 01-15-2009 |
| 20090044947 | FLAPPER GAS LIFT VALVE - A gas lift valve has a flow restrictor, a valve part on one side of the flow restrictor, a flow deflector and a tubular member on another side of the flow restrictor, and a flapper valve on the side of the flow restrictor where the tubular member is located, the flapper valve being adjacent to the tubular member. When fluid flows into the gas lift valve at sufficient pressure, the valve part opens, the fluid flows through the flow restrictor and acts on the flow diverter thereby moving the tubular member and opening the flapper valve. The tubular member extends though the opening the flapper valve covered. | 02-19-2009 |
| 20090050327 | Switching Apparatus Between Independent Control Systems for a Subsurface Safety Valve - A system is provided for switching between redundant control systems for a subsurface safety valve (SSV) while being able to isolate the closure spring from hydrostatic pressure in the control line of the system that is not being used. There are two control lines that connect to discrete operating pistons that are both coupled to the flow tube. Each operating piston is connected to a control rod with the control rods terminating near opposed ends of a pivoting member. Pushing down on one rod pushes up on the other rod so that the other rod is held supported and the hydrostatic pressure in its associated control line doesn't affect the force needed by the closure spring to close the SSV. Releasing control line pressure puts the system in neutral to allow either of the systems to be reselected. | 02-26-2009 |
| 20090200034 | COMPLETION TOOL - A differential pressure operated blanking tool comprises a Y-tool ( | 08-13-2009 |
| 20090218102 | Multi-Cycle Single Line Switch - Systems and methods for selectively operating multiple hydraulic pressure controlled devices (PCDs) within a borehole using a common inflow and outflow line and a common cycling line. A control system is used wherein each of the PCDs is operationally associated with a separate sleeve controller. The sleeve controller for each PCD controls whether the individual PCD can be actuated by hydraulic pressure variations in the common inflow and outflow lines. | 09-03-2009 |
| 20090236099 | Multiple Spring Subsurface Safety Valve - A subsurface safety valve features vertically stacked springs that are each independently supported in the valve housing and each having an opposite end that bears on a shoulder connected to the flow tube. When mounted this way their applied force is additive as they are in effect mounted in parallel between the housing and the flow tube for overcoming hydrostatic pressure in deep set applications that can exceed 20,000 feet. The stacking also allows the cross-sectional area of the flow tube to be maximized for a given housing outside diameter dictated by well conditions. | 09-24-2009 |
| 20100116502 | Tubing Pressure Insensitive Control System - A system isolates a control system for a downhole tool from the internal pressures in the tubing in which the tool is mounted. Opposed seals are used on a moving component in the tool so as to offset pressure induced forces regardless of the internal operating pressure of the tool. In a particular application to a subsurface safety valve the control system can be isolated from tubing pressure by offset seals between the passage and the flow tube or around exposed portions of the operating piston for the flow tube. | 05-13-2010 |
| 20100282473 | Aerator for a well water pumping system - A novel aerator for use inside a well casing in conjunction with a submersible pump, the aerator comprising a check-valve with a nozzle for spraying a portion of a water supply that is being pumped by the pump. The spray is directed towards the well water within the well casing and is calibrated to provide enough agitation to promote the evolution of dissolved gases in the water both as it is sprayed and also as the spray contacts the surface of the well water. The check-valve is calibrated to operate at a pressure threshold to ensure that spraying occurs only when the pump is running. | 11-11-2010 |
| 20100288502 | Shear Open Valve - The present invention regards a device designed for injection of fluids in a well bore, typically an offshore well bore for petroleum production and gas injection/gas lift system for fluid injection. The device comprises a outer hollow housing ( | 11-18-2010 |
| 20100307758 | DUAL FLAPPER SAFETY VALVE - A valve system for use in a subterranean well, the valve having multiple closure devices, or a closure device and a device for protecting the closure device. A valve system includes a valve with a closure assembly. The closure assembly has a closure device and a protective device which alters fluid flow through a flow passage of the valve prior to closure of the closure device to thereby protect the closure device. A safety valve system includes a safety valve with a closure assembly having at least two closure devices arranged in series for controlling flow through a flow passage of the safety valve. Another safety valve system includes a safety valve assembly including multiple safety valves arranged in parallel. One portion of fluid from a fluid source flows through one of the safety valves, while another portion of fluid from the fluid source flows through another safety valve. | 12-09-2010 |
| 20110011594 | Mud Pulse Telemetry System - A mud pulser tool to be positioned into a downhole environment is disclosed. The mud pulser tool includes a control valve that is selectively opened to allow fluid to flow through the mud pulser tool or selectively closed to restrict the fluid flow, wherein the control valve is selectively opened or closed to produce a mud pulse signal transmitted through the fluid. The mud pulser tool also includes a sensor system to measure a pressure drop across the control valve. In one example, the mud pulser tool includes a control system to selectively open or close the control valve to adjust the pressure drop to produce a selected pressure drop across the control valve. | 01-20-2011 |
| 20110067878 | FLOW CONTROLLER DEVICE - A flow controller device ( | 03-24-2011 |
| 20110079393 | CIRCULATION CONTROL VALVE AND ASSOCIATED METHOD - A circulation control valve. A method of controlling circulation flow between an interior flow passage of a tubular string and an annulus external to the tubular string in a subterranean well includes the steps of: interconnecting a valve in the tubular string, the valve including at least one opening for providing fluid communication between the interior flow passage and the annulus; applying an increased pressure to the interior flow passage while fluid communication through the opening between the interior flow passage and the annulus is prevented, thereby permitting fluid communication through the opening between the interior flow passage and the annulus; and then applying another increased pressure to the interior flow passage while fluid communication through the opening between the interior flow passage and the annulus is permitted, thereby preventing fluid communication through the opening between the interior flow passage and the annulus. | 04-07-2011 |
| 20110108279 | SELF-SEALING CHEMICAL INJECTION LINE COUPLING - There is provided a chemical injection line connector including first and second couplings configured to automatically seal shut when the members are disengaged. There is further provided a method for blocking contamination or pressure transfer of chemical injection lines by securing first and second couplings to corresponding ends of a chemical injection line and automatically sealing the couplings shut when the couplings are disengaged. | 05-12-2011 |
| 20110132614 | Wireline Run Mechanically or Hydraulically Operated Subterranean Insert Barrier Valve and Associated Landing Nipple - A unique landing nipple has spaced control line connections and external control lines running from the surface to those connections. A hydraulic barrier valve, such as a ball valve, is run in to a predetermined landing nipple and latched in position where the control line connections are in the right locations to operate the valve. A landing nipple with a latching groove alone can be used with a wireline run barrier valve to latch it into position at the desired location. A shifting tool is used to operate the mechanically actuated valve. More than one valve can be positioned or used in the string at a time or the same valve can also be positioned at different landing nipples at different times to meet the production needs of the well operator. | 06-09-2011 |
| 20110209874 | Tubing Pressure Insensitive Control System - A system isolates a control system for a downhole tool from the internal pressures in the tubing in which the tool is mounted. Opposed seals are used on a moving component in the tool so as to offset pressure induced forces regardless of the internal operating pressure of the tool. In a particular application to a subsurface safety valve the control system can be isolated from tubing pressure by offset seals between the passage and the flow tube or around exposed portions of the operating piston for the flow tube. | 09-01-2011 |
| 20110240299 | SUBTERRANEAN WELL VALVE ACTIVATED WITH DIFFERENTIAL PRESSURE - A method of actuating a valve in a well can include storing energy as a result of a differential pressure across a closed closure device of the valve, and releasing at least a portion of the stored energy while opening the closure device. A valve for use in a well can include a closure device, a biasing device, and an actuator which stores energy in the biasing device in response to a pressure differential across the closure device. A well system can include a tubular string, and a valve which controls fluid flow through the tubular string. The valve may include a closure device and an actuator which actuates the valve at least partially in response to a pressure differential across the closure device. | 10-06-2011 |
| 20110240300 | MUD SAVER VALVE AND METHOD OF OPERATION OF SAME - A mud saver valve, positionable at the bottom of the drill string, above the bit, which includes an elongated body portion; portion of the valve housing a compressible spring a pressure; a valve mechanism which is a sliding sleeve moveable between open and closed positions within the valve; while in the closed position, drilling fluid cannot pass through the valve; when a combination of static and pump pressure exceeds the setting pressure of the dome, the sleeve will be moved by actuation pistons to the open position, at which drilling fluid is allowed to through the valve. Also, wherein when the valve is normally closed, as long as the fluid column pressure is less than the setting pressure, the valve remains closed, and allows the drill string to be disconnected and a section of pipe can added without the fluid draining from the drill column above the bit, and thus saving fluid. | 10-06-2011 |
| 20110284233 | Hydraulic Actuation of a Downhole Tool Assembly - A downhole tool assembly is configured for repeated and selective hydraulic actuation and deactuation. A piston assembly is configured to reciprocate axially in a downhole tool body. The piston assembly reciprocates between a first axial position and second and third axial positions that axially oppose the first position. The downhole tool is actuated when the piston assembly is in the third axial position and deactuated when the piston assembly is in either of the first or second axial positions. A spring member biases the piston assembly towards the first axial position while drilling fluid pressure in the tool body urges the piston assembly towards the second and third axial positions. Downhole tool actuation and deactuation may be controlled from the surface, for example, via cycling the drilling fluid flow rate. | 11-24-2011 |
| 20120024531 | AUTOCHOKE SYSTEM - Back pressure control devices used to control fluid pressure in a wellbore require various utilities for operation, such as an air supply. Apparatus disclosed herein provide for the continued operation of one or more back pressure control devices when supply of utilities for operation of the back pressure control devices are intentionally or unintentionally interrupted. | 02-02-2012 |
| 20120061089 | APPARATUS AND DEVICE FOR DELIVERING FLUID DOWNHOLE AND INCREASING WELL PRODUCTION - An apparatus and device for hydrocarbon recovery in a well for coal bed methane (CBM) recovery, tight sand gas extraction, and other gas extraction techniques provides for the formation of a hydrocarbon foam comprised of a fluid delivered into a downhole portion of the well and the hydrocarbon, maximizing water removal for gas recovery. The apparatus may include a check valve that feeds a nozzle to deliver or atomize the spray of fluid into the downhole portion of the well when the pressure applied to the fluid is sufficient to overcome a hydrostatic pressure in the downhole portion of the well and to deliver the fluid into the downhole portion of the well. The fluid is not sprayed directly into the formation, thereby protecting the formation from damage and recovering the fluid even in the case where water is not present. The capillary tube feeding the fluid to the check valve may be placed externally to the production tube to facilitate ease of cleaning and clearing of the production tube. | 03-15-2012 |
| 20120132428 | BI-STABLE VALVE - A bi-stable valve includes a first chamber having a first aperture and a second aperture, and a second chamber having a first aperture and a second aperture. The bi-stable valve also includes a shaft having a first valve member adjacent a first end of the shaft and a second valve member adjacent an opposite second end of the shaft. The shaft is movable between a first position, in which the first valve member closes off the second aperture of the first chamber and the second valve member closes off the second aperture of the second chamber to prevent fluid from passing through the second apertures of the first and second chambers, and a second position, in which the first valve member and the second valve member allow fluid to pass through the second aperture of the first chamber and the second aperture of the second chamber. | 05-31-2012 |
| 20120138305 | HYDRAULIC CONTROL SYSTEM FOR ACTUATING DOWNHOLE TOOLS - A hydraulic control system ( | 06-07-2012 |
| 20120145403 | Intelligent Pressure Actuated Release Tool - A pressure pulse signal is processed and a valve is operated to allow tubing or annulus pressure to move a piston against an atmospheric or low pressure chamber. Movement of the piston triggers the release of the dogs that previously held two components together for a separation. Redundant release mechanisms that respond to discrete pressure pulse signals are provided for backup purposes. | 06-14-2012 |
| 20120152552 | PRESSURE RANGE DELIMITED VALVE WITH CLOSE ASSIST - A pressure-actuated valve fit to a tubing string for alternately closing to communicate fluids from a wellbore to the tubing string and opening to communicate fluids from a wellbore annulus to the tubing string. The valve is particularly useful for lifting liquids which accumulate in the tubing string when the reservoir has a diminished pressure. In this case, gas is accumulated in the wellbore annulus and when the valve is opened the gas enters the valve and is directed to the tubing string for lifting the liquids. The valve is closed by a spring and has a closing-assist which applies an additional force to the spring to ensure the valve is fully closed. | 06-21-2012 |
| 20120193101 | SUBSURFACE SAFETY VALVE INCLUDING SAFE ADDITIVE INJECTION - A safety valve for an effluent-production installation, the safety valve comprising a longitudinal shell in which there extends a production tube defining an inside volume for effluent flow, the tube being movable in translation inside the shell in an axial direction between an advanced position in which effluent flow is authorized from the bottom of the installation towards the surface, and a retracted position in which effluent flow is prevented, the valve being characterized in that it further includes a connection duct between a feed line for feeding at least one additive from the surface and an injection line for injecting the additive downhole, a safety plug being provided in the connection duct in order to close or open the duct depending on whether the production tube is in its retracted position or its advanced position. | 08-02-2012 |
| 20120273209 | WEGHTED PRESSURE RELIEF VALVE - A subsea pressure relief valve includes a water-filled nozzle fluidly connected to a hydrocarbon distribution manifold. A valve body is connected to the distribution manifold, with an outlet of the nozzle coincident with an interior water-filled chamber of the valve body. A first seal element is removably seated against the nozzle outlet and an arm is hinged to the body and configured to apply a force along a seal axis and bias the first seal element into sealing engagement with the nozzle outlet until hydrocarbon pressure exceeds a sealing pressure of the applied force and unseats the first seal element from the nozzle outlet such that excess hydrocarbons exit through an outlet of the valve body. A weight is disposed on the arm at a distance from the seal axis. | 11-01-2012 |
| 20130000917 | CASING FILL-UP FLUID MANAGEMENT TOOL - A fluid management tool for introducing fluids into a casing string incorporates a mud saver valve configured to open and allow fluid flow in response to fluid flow pressure reaching a predetermined opening pressure, and will automatically close when fluid flow pressure is reduced to or below a predetermined closure pressure, thereby preventing fluid spillage when the tool is withdrawn from the casing. The mud saver valve includes a mud saver spool having a slotted spool cage and being axially movable within a longitudinal bore in the main body of the tool, between an upper or open position in which fluid can flow out of the spool cage and into a discharge bore at the lower end of the main body, and a lower or closed position in which the lower end is seated against the exit bore to prevent flow therethrough. A check valve may be incorporated into the lower end of the mud saver spool. The fluid management tool also may incorporate a main seal and air bleed valve subassembly and a secondary suction seal and check valve subassembly. | 01-03-2013 |
| 20130092382 | METHOD AND APPARATUS FOR CONTROLLING FLUID FLOW USING MOVABLE FLOW DIVERTER ASSEMBLY - Apparatus and methods for controlling the flow of fluid, such as formation fluid, through an oilfield tubular positioned in a wellbore extending through a subterranean formation. Fluid flow is autonomously controlled in response to change in a fluid flow characteristic, such as density or viscosity. In one embodiment, a fluid diverter is movable between an open and closed position in response to fluid density change and operable to restrict fluid flow through a valve assembly inlet. The diverter can be pivotable, rotatable or otherwise movable in response to the fluid density change. In one embodiment, the diverter is operable to control a fluid flow ratio through two valve inlets. The fluid flow ratio is used to operate a valve member to restrict fluid flow through the valve. | 04-18-2013 |
| 20130153239 | FLUID SAFETY VALVE - A bi-directional fluid safety valve for preventing spillage when filling tanks, vessels, fill lines, and or hoses for transportation of fluids in pipelines or tubulars with a tubular body with an external body and an internal bore having a fluid flow path from a first end to a second end, the first and second members concentrically disposed and moveable along a longitudinal axis within the tubular body; with means such as springs to longitudinally bias the first member toward the second member and means to longitudinally bias said second member toward said first member. Also provided are embodiments for connection of the tubular body to alternative connection systems. | 06-20-2013 |
| 20130220622 | ACTUATOR FOR DUAL DRILL STRING VALVE AND DRILL STRING VALVE CONFIGURATIONS THEREFOR - A dual drill string actuator includes a piston disposed in a housing. The housing is configured to sealingly couple at its longitudinal ends to an end of a nested dual drill string segment. An upper internal conduit is mounted in the housing proximate one longitudinal end thereof. A lower internal conduit is mounted in the housing proximate the other longitudinal end thereof. The piston is slidably, sealingly engaged between the upper and lower inner conduits and together define an internal fluid flow passage therethrough. The upper inner conduit, the piston and the lower inner conduit also define an external flow passage between respective exterior surfaces thereof and an interior of the housing such that application of fluid pressure to the external flow passage causes movement of the piston. | 08-29-2013 |
| 20130220623 | ACTUATOR FOR DUAL DRILL STRING VALVE AND ROTARY DRILL STRING VALVE CONFIGURATION THEREFOR - A dual drill string valve includes an actuator including a piston disposed in a housing. The housing is configured to couple at its ends to an end of a nested dual drill string segment. An upper internal conduit is mounted in the housing proximate one longitudinal end thereof. A lower internal conduit is mounted in the housing proximate the other longitudinal end thereof. The piston is slidably, sealingly engaged between the upper and lower inner conduits and defines a fluid flow passage therethrough. The upper inner conduit, the piston and the lower inner conduit define another flow passage between respective exterior surfaces thereof and an interior of the housing such that application of fluid pressure to the external flow passage causes movement of the piston away from the upper inner conduit. A rotary valve is coupled to the actuator whereby longitudinal movement thereof rotates the rotary valve. | 08-29-2013 |
| 20130220624 | WIRELINE RETRIEVABLE INJECTION VALVE ASSEMBLY WITH A VARIABLE ORIFICE - A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, thereby damaging the seat. | 08-29-2013 |
| 20140034325 | Integral Multiple Stage Safety Valves - An integral multistage safety valve is designed to provide a second level of protection should a first stage fail. The valve may be used in oil and/or gas wells. The interior portion of the multiphase safety valve is designed so as to reduce turbulence and pressure loss through the valve when the valve is in an open position. The valves may be independently operable, or operable with a single control line. The multi-stage valve reduces the number of body joints required to construct two identical valves thereby reducing cost and potential leak paths and increasing reliability of the system. | 02-06-2014 |
| 20140290959 | FLOW STOP VALVE - A flow stop valve ( | 10-02-2014 |
| 20150330189 | STAGE TOOL FOR WELLBORE CEMENTING - A stage tool for wellbore annular cementing may be opened for cementing by hydraulic actuation of a sliding sleeve valve from over a fluid port. After sufficient cement has been introduced, the stage tool fluid port can be closed by compressing two telescopically arranged parts of its tubular body to further overlap each other and overlie the fluid port. This permits the stage tool to be closed without employing a plug. | 11-19-2015 |
| 20150361763 | DUAL BARRIER INJECTION VALVE - A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, which may damage the seat. | 12-17-2015 |
| 20160069156 | WIRELINE RETRIEVABLE INJECTION VALVE ASSEMBLY WITH A VARIABLE ORIFICE - A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, thereby damaging the seat. | 03-10-2016 |
| 20190145188 | SAFETY VALVE COUPLING AND METHOD OF MANUFACTURING VALVE | 05-16-2019 |
| 166322000 | Retrievable | 1 |
| 20120205115 | SUB SURFACE SAFETY VALVE - According to the present invention, there is provided a sub surface safety valve in a well system comprising an upper support means, a sub surface safety valve, a sealing means that seals against the inside of the production path and a bore through the sub surface safety valve and sealing means which connects to an annular inlet beneath the sealing means and an annular outlet above the sub surface safety valve. | 08-16-2012 |
| 166323000 | Locked open or closed | 5 |
| 20090071654 | Tubing Retrievable Injection Valve - A flapper type downhole valve is opened by flow against the flapper. The flapper and the housing contain magnets that hold the flapper open after it has been opened by flow to keep the flapper from chattering from the flow going past it. The strength of the force is not sufficient to hold the flapper open against a torsion spring on a pivot pin, when there is no flow through the valve. The valve can still be held in the locked open position with no flow through the housing by pressurizing the surrounding annulus to position another magnet to increase the holding force to a level greater than the force of the torsion spring. The additional magnet is spring biased so that upon removal of annulus pressure it shifts to allow the flapper to close. Alternative designs with and without a flow tube are possible. Fixed or movable restrictions can be associated with the flow tube to create a force to shift it to open a flapper with flow into the well. | 03-19-2009 |
| 20120090849 | HYDRAULIC DISCONNECT - A hydraulic disconnect is disclosed comprising: a downhole housing; an uphole housing; an inner mandrel at least partially disposed telescopically within the downhole housing, the inner mandrel having a latch extendable in a radially outward direction to latch against an inner shoulder of the downhole housing to restrict the downhole housing from relative downhole movement, the inner mandrel being connected for transmission of torque to the downhole housing; a piston at least partially disposed telescopically within the inner mandrel and having a latched position in which an outer surface of the piston is radially inward of the latch to maintain latching against the inner shoulder, and an unlatched position in which a groove in the outer surface is radially inward of the latch to allow radial contraction of the latch into the groove for release of the inner shoulder, the piston having a valve seat; and a lock for maintaining the piston in the latched position, the lock being adapted to unlock in use upon receipt by the valve seat of a disconnect valve member and application of a predetermined hydraulic pressure in a downhole direction against the disconnect valve member to allow the piston to move into the unlatched position; in which the uphole housing has a stop for restricting the downhole housing from relative uphole movement and the inner mandrel is threaded to the uphole housing such that relative rotation between the uphole housing and the downhole housing in use tightens the downhole housing between the latch and the uphole housing. | 04-19-2012 |
| 20120273210 | PROCESSES AND SYSTEMS FOR TREATING OIL AND GAS WELLS - Systems and processes are provided for removing fluid from a subterranean well and enhancing the production of oil and/or gas are herein disclosed. In one embodiment, the system includes an injection conduit, an injection valve, a relief valve, a container, a container valve, a return conduit valve, and a return conduit, all arranged within a subterranean well for removing at least one fluid from the well. The removal of at least one fluid from the well is controlled by the flow of gas into the injection conduit. | 11-01-2012 |
| 20120305257 | WELLBORE VALVE ASSEMBLY - A wellbore valve assembly including a valve member which is moveable relative to the valve seat, the valve assembly being receivable in a wellbore tubing having a first end and a second end, the valve member being moveable between an open position relative to the valve seat, and a position in which the valve member is seated against the valve seat, the valve assembly including a valve member biasing device for biasing the valve member towards the open position, the valve member being operable to close in the event of a force which exceeds a predetermined value being applied in either direction relative to the direction in which the valve member biasing device acts. | 12-06-2012 |
| 20150337625 | Pressure Actuated Ported Sub for Subterranean Cement Completions - A shifting sleeve has differential piston areas so that applied pressure displaces the sleeve against spring bias, which preferably is a series of Belleville washer stacks associated with modular mandrel components, to obtain the desired opposing force to the movement initiated with pressure applied to differential piston areas. An indexing feature is located between the sleeve and the mandrel passage wall and on a predetermined number of cycles disables the Belleville washer stacks from biasing the sleeve in an opposed direction as when pressure is applied. At this time the pressure in the mandrel acting on the differential piston area simply shifts the sleeve to open a lateral port so that fracturing through the cement that was earlier placed with the port closed can take place. | 11-26-2015 |
| 166324000 | With fluid pressure equalizing means | 10 |
| 20080223581 | Downhole Barrier Valve - A ball type downhole barrier valve capable of bidirectional sealing features a ball rotating on its axis to open or close with control line pressure to an actuating rod piston assembly. The ball is also shiftable to a locked open position. A cage surrounds the ball and retains opposed seats to it. The cage is made from one piece and tangential holes are drilled and tapped before the piece is longitudinally split with a wire EDM cutting technique. Fasteners to rejoin the cut halves properly space them to the original one piece internal dimension. Auxiliary tools allow determination of spacing of internal components so that a desired spring preload on the seats against the ball can be achieved. Seals on the sleeves that form ball seats help prevent leakage due to ball distortion at high differential pressures when the valve is closed. | 09-18-2008 |
| 20090008097 | Externally energized constant-thrust device - This invention is a constant-thrust device intended for use in submerged or pressured environments based on a piston-in-cylinder arrangement in which the enclosed chamber is evacuated or gas-filled to comparatively low pressure. The invention extends to boundary envelopes of general shape of which a cylinder is a simple form and to movable boundaries between pressured and unpressured spaces of which a piston is a simple form. | 01-08-2009 |
| 20100006295 | PRESSURE RELIEF ACTUATED VALVES - An embodiment of a valve that is operable from one position to another position upon relief of an applied pressure includes a housing having a bore; a valve member disposed with the housing, wherein the valve member is actuated to one position in response to a certain applied pressure and actuates toward another position upon relief of the certain applied pressure; and a relief system relieving the pressure applied to the valve member when the applied pressure falls below a selected pressure level. | 01-14-2010 |
| 20110079394 | Multi-stage Pressure Equalization Valve Assembly for Subterranean Valves - A downhole valve that operates on turning of a member having a passage through it with a control system also features a passage from above an uphole seat for the member which communicates to the isolated passage within the member when the valve is closed. The passage features a check valve assembly that preferably has redundant sealing features and filters to prevent debris entry. Pressure applied from above the closed member gets through the check valve assembly to equalize the higher pressure below the ball with the pressure raised in the ball from pressure application at the surface. Removal of the applied pressure reseats the check valve or valves to allow the hydraulic system to rotate the member while the member is no longer subject to a high differential pressure. | 04-07-2011 |
| 20110088906 | Pressure Equalizing a Ball Valve through an Upper Seal Bypass - A pressure equalizing system allows flow past an upper seal on a movable member downhole that in turn allows pressure to be delivered from uphole into what had previously been an isolated low pressure zone. The pressure differential across the member is equalized before attempting to move the member into another position. In the preferred embodiment the member is a ball in a ball valve for subterranean use. | 04-21-2011 |
| 20110155379 | ROTATING CONTINUOUS FLOW SUB - A method for drilling a wellbore includes drilling the wellbore by advancing the tubular string longitudinally into the wellbore; stopping drilling by holding the tubular string longitudinally stationary; adding a tubular joint or stand of joints to the tubular string while injecting drilling fluid into a side port of the tubular string, rotating the tubular string, and holding the tubular string longitudinally stationary; and resuming drilling of the wellbore after adding the joint or stand. | 06-30-2011 |
| 20120012327 | Hydraulically Controlled Barrier Valve Equalizing System - A barrier valve has an equalizing feature for the ball or plug when in the closed position before it is opened. A hydraulic open and a close line are connected to a housing so that they can move a piston in opposed directions. The piston ends are sealed and the exterior of the piston is tapered to push one or more bypass valves open to connect tubing pressure across the ball when ramped off its seat. Pressure on the main hydraulic line to close the ball reverses the piston movement and allows a spring bias to close the bypass valve or valves. The equalizing system can be integrated into the barrier valve housing or can be separate as a retrofit. | 01-19-2012 |
| 20120152553 | SUBSEA ARRANGEMENT - A subsea arrangement comprising an external casing and a pressure equalizing valve for equalization of the fluid pressure in an internal space of the casing. The pressure equalizing valve comprises a swing arm and a valve member arranged inside the casing. The swing arm carries the valve member and is pivotable about a pivot axis, under the effect of an external fluid pressure acting on the valve member, from a resting position, in which the valve member covers an opening provided in the casing and prevents fluid flow through this opening, to a raised position, in which the valve member uncovers said opening and allows fluid flow through it from the surroundings into said space for equalization of the fluid pressure therein when the arrangement is lowered into the sea. The swing arm is pivotable from the raised position to the resting position under the effect of gravity. | 06-21-2012 |
| 20120227972 | SUBSEA ARRANGEMENT - A subsea arrangement comprising an external casing and a pressure equalizing valve for equalization of the fluid pressure in an internal space of the casing. The pressure equalizing valve is provided with a valve body including a base section displaceably received in an opening provided in the casing; and a valve member secured to the base section and arranged inside the casing, the valve member facing a valve seat surrounding said opening. The valve body is displaceable upwards, under the effect of an external fluid pressure, from a resting position, in which the valve member prevents fluid flow into and out of said internal space, to a raised position, in which the valve member allows fluid flow from the surroundings into said internal space for equalization of the fluid pressure therein when the subsea arrangement is lowered into the sea. | 09-13-2012 |
| 20150376981 | PRODUCTION STRING PRESSURE RELIEF SYSTEM - A production string pressure relief system comprising a hollow cylindrical housing with an outer wall, a first relief valve assembly that is mounted on a first support base that is welded to the outer wall of the housing, and a second relief valve assembly that is mounted on a second support base that is welded to the outer wall of the housing directly opposite the first support base. Each of the first and second relief valve assemblies comprises a valve element that is in the shape of a spherical segment with a spherical sealing face, a cylindrical valve seat with a circular sealing face, and a leaf spring. The leaf spring provides a biasing force that pushes the spherical sealing face of the valve element against the circular sealing face of the valve seat to form a fluid-tight seal when the valve is in a normally closed position. | 12-31-2015 |
