158 results about "Downhole safety valve" patented technology

A lock open device for a flapper is disclosed. The tool engages in the sub-surface safety valve (SSSV) body and rotates the flapper to the open position, without shifting the flow tube. The flapper base is preferably held by a shearable thread and has a groove for engagement by the tool. The tool jars down on the flapper base to shear the thread and force the held open flapper into a retaining groove. Optionally, a penetrating tool can be connected so that, in a single trip, the flapper can be locked open and the pressurized control system can be accessed. Shearing the thread allows the flow tube spring to bias the held open flapper into its retaining groove.

A subsea well production system has a natural drive mode and a lift-assist mode using a submersible pump. The submersible pump can be installed while the well is live. The well system has a downhole safety valve in the production tubing. The operator closes the downhole safety valve and lowers an electrical submersible pump assembly into the production tubing. Once landed, the valve is opened and the pump assembly placed in operation.

A tubular column for separated layer water injection comprises a subsurface safety valve, an exhaust valve, a multi-tube traverse packer, a hydraulic-control pipeline, hydraulic-control packers, sliding sleeve type water nozzles, a backwashing valve, a suspension packer, a sand-prevention bushing, sand filtering tubes and interlayer packers. An oil tube is sequentially connected with the subsurface safety valve, the multi-tube traverse packer, the corresponding hydraulic-control packer, the corresponding sliding sleeve type water nozzle, the corresponding hydraulic-control packer, the corresponding sliding sleeve type water nozzle, the corresponding hydraulic-control packer, the corresponding sliding sleeve type water nozzle, the backwashing valve and a guide connector. The sand-prevention bushing is installed outside the oil tube in a connected mode. The suspension packer, the corresponding sand filtering tube, the corresponding interlayer packer, the corresponding sand filtering tube, the corresponding interlayer packer, the corresponding sand filtering tube and a plug are sequentially installed on the sand-prevention bushing in a connected mode, and a bushing is arranged on the outmost part. The exhaust valve is installed on the multi-tube traverse packer in a connected mode, the hydraulic-control pipeline is installed on the exhaust valve for control, the hydraulic-control packers are traversed, connected and controlled through the same hydraulic-control pipeline, the sliding sleeve type water nozzles are connected through the hydraulic-control pipeline for control, and the subsurface safety valve is connected with the hydraulic-control pipeline for control.

The application discloses a valve, which may include either a safety valve or a storm surge choke valve or the like, to isolate a zone below a valve from a string of production tubing. Preferably, the valve includes a flow interruption surface assembly, such as a flapper valve or a ball valve, displaced by an operating conduit extending from a surface location to the valve through the inside of the production tubing. The application also discloses a bypass-conduit inside the production tubing to allow communication from a surface location to the production zone when the valve is in either an open or a closed location.

The invention relates to a well safety valve control system, which comprises: an air-powered pressurizing pump and a ground safety valve control circuit, wherein said ground safety valve control circuit comprises one high-pressure needle valve, one-way valve, a pressure meter, and an energy accumulator; one overflow valve is between the one-way valve and the pressure meter; one end of high-pressure needle valve is connected to the air-powered pressurizing pump; one end of energy accumulator is connected to the ground safety valve and connected to the air source; another high-pressure needle valve is between the one-way valve and the pressure meter; the under-well safety valve control circuit is between the air-powered pressurizing pump and the under-well safety valve; said circuit comprises one high-pressure needle valve, one-way valve, pressure meter, and energy accumulator which are connected; another branch is between the one-way valve and the pressure meter, whose another end is connected between the one-way valve and the pressure meter; said branch has two one-way valves; one high-pressure needle valve is between two one-way valves.

The invention discloses a downhole safety valve, wherein a central tube is arranged in a main body consisting of a top joint, a valve body, an outer cylinder and a tail joint connected sequentially; the upper end of the top joint and the lower end of the tail joint are respectively connected with an external oil tube; a corrugated tube assembly is arranged in the gap between the outer cylinder and the central tube, and the bottom end of the corrugated tube assembly is connected with a positioning ring fixed on the peripheral wall of the central tube; a boss is formed on the inner wall of the lower port of the outer cylinder, a pressure spring is sleeved on the periphery of the central tube between the lower side of the positioning ring and the boss, and a plate valve assembly is connected to the bottom end of the outer cylinder; the top joint is provided with a control line, the control line is embedded on the top joint through a control line connection assembly and communicated with a hydraulic oil passage formed in the valve body wall, and the bottom port of the hydraulic oil passage in the valve body wall is connected with the top end of the corrugated tube assembly. The downhole safety valve can be used in extreme environment with well conditions such as super high temperature steam thermal recovery, high gas tightness requirement, ultradeep installation, high sandiness environment and high corrosion.

The application discloses a safety valve including a flapper valve and a packer assembly to be installed in a bore to isolate a first zone from a second zone. Preferably, the safety valve includes a hydraulic conduit bypassing the flapper valve to allow communication therethrough when the valve is closed. Furthermore, the safety valve preferably allows unobstructed passage of tools and fluids therethrough when the flapper valve is open. The application discloses a method to install a safety valve in an existing string of tubing by deploying a packer assembly having an integral safety valve.

A downhole safety valve is connected into an oil pipe; a hydraulic cavity in an upper joint is provided with a piston rod; the hydraulic cavity is connected with a hydraulic control pipeline; the tailis connected with a spring sleeve; a spring in the spring sleeve is located between a driving pipe and an upper valve seat; the upper valve seat is connected with the spring sleeve; the driving pipeis connected with an upper central pipe; the driving pipe is in clearance fit with the upper joint; the upper valve seat is in clearance fit with the upper central pipe; the upper valve seat is connected with an upper valve plate; the upper valve seat is internally provided with an upper self-balancing component; the spring sleeve is connected with a transition joint A; the transition joint A is fixedly connected with a lower valve seat; a shear pin is connected with the lower valve seat; the lower valve seat is connected with a lower valve plate; the lower valve seat is provided with a lowerself-balancing component; and the lower valve seat is connected with a lower joint. Through the design of the upper-lower two-stage valve plates or more-stage valve plates, and by increasing the pressure of the control pipeline, a secondary valve plate is controlled to open and close by pushing the upper central pipe to cut the shear pin in the lower valve seat; and the service life of the safetyvalve is prolonged, and the material procurement cost of oil fields is reduced.

The invention belongs to the field of oil-gas field development, and particularly relates to a self-balancing downhole safety valve. The self-balancing downhole safety valve is of a columnar annular structure and comprises an upper joint, a piston sleeve, a spring sleeve, a connecting joint, a lower joint, a drive pipe, a center pipe, a spring and a valve base structure. The self-balancing downhole safety valve is characterized in that the upper joint, the piston sleeve, the spring sleeve, the connecting joint and the lower joint are sequentially fixedly connected to form a hollow shell, the drive pipe, the center pipe, the spring and the valve base structure are arranged in the shell formed by the upper joint, the piston sleeve, the spring sleeve, the connecting joint and the lower joint, the drive pipe is fixedly connected with the center pipe, the spring is arranged on the center pipe, the top end and the bottom end of the spring abut against the bottom of the drive pipe and the top of the connecting joint respectively, and the valve base structure is arranged at the lower end of the connecting joint. According to the self-balancing downhole safety valve, the opening and closing actions of an oil well in a normal work state can be excellently finished, the reliable later-period repair function is designed, and therefore reliability of a well mouth safety system is greatly improved.

The invention relates to a downhole blow-out preventer with an automatic controlling and anchoring function, which is used in a condition of occurring well kick or blowout in a drilling process of an oil and gas field. The downhole blow-out preventer can be used for automatically turning on a shut-in well underground, and can be used for de-blocking the preventer in time according to demands. According to the technical scheme, an underground safety valve is mounted in a drill column on a drill pipe; a base sealing and anchoring device is mounted on the downhole blow-out preventer; a lower joint is connected with a lower part drill pipe; an outer wall one-way valve assembly is mounted on an outer cylinder; a switching-on pin is mounted on the outer cylinder and a pressurizing piston; the outer cylinder is fixed by the lower joint; the pressurizing piston is mounted outside a center pipe; a rubber cylinder base is in close contact with a separation ring; the lower end of an outer center pipe is in contact with the rubber cylinder base, and a distance is reserved between the upper end of the outer center pipe and an anchoring tilt cone; a blow-out prevention sealing rubber cylinder is in tight contact with the outer center pipe; and an anchoring tile, the center pipe and an anchoring tile sleeve are fixedly arranged by an upper joint. The downhole blow-out preventer can be used for effectively preventing the blowout underground, so anchoring, blowout prevention and operation while drilling when the well kicks can be realized; the reliable operation is realized; and the drilling efficiency can be improved.

The invention relates to a sliding sleeve type subsurface safety valve. The sliding sleeve type subsurface safety valve comprises a lower joint (1), an upper joint (2), a housing (3), a power device (5) and a sliding sleeve (6), wherein an oil gas passage (4) is arranged inside the lower joint (1); a thin shaft part at the upper part of the lower joint (1) is matched and connected with the upper joint (2) through threads; a thick shaft part at the lower part of the lower joint (1) and the upper joint (2) are respectively matched with the housing (3); an annular inserting groove (11) is formed in the inner part of the lower joint (1) in the axial direction; the power device (5) is mounted in a closed cavity formed by the lower joint (1), the upper joint (2) and the housing (3); the sliding sleeve (6) comprises a connecting part (6) and an isolating part (10); the connecting part (9) is connected with the output end of the power device (5); the isolating part (10) is matched with the annular inserting groove (11) in an inserting connection mode. The sliding sleeve type subsurface safety valve has the advantages of rapid and sensitive reaction, complete isolation and reusing.

The invention discloses a dual-flap-valve type downhole safety valve which comprises an outer shell formed by sequentially connecting an upper short piece, a middle short piece and a lower short piece, wherein the inner cavity of the middle short piece is provided with a spring; the inner cavity of the upper short piece is provided with a piston pipe; the piston pipe is of a cylinder structure; the pipe wall of the upper short piece is internally provided with at least two plunger holes for mounting plungers along an axial direction; the upper ends of the plunger holes are connected with the outside by virtue of a hydraulic pipeline joint; each plunger hole is internally provided with a group of plunger assemblies; the lower opening of the middle short piece is connected with an upper valve base by virtue of threads; an upper flap valve is arranged below the upper valve base; the convex shoulder of the inner cavity of the lower short piece is connected with a lower valve base by virtue of threads, and a lower flap valve is arranged below the lower valve base is provided with. According to the dual-flap-valve type downhole safety valve, a dual-flap-valve structure is adopted and the two plungers are adopted for driving, so that double shut of downhole pressure is realized, the dual-flap-valve type downhole safety valve is simple in structure and reliable in operation.

A technique is provided for terminating tubing. In the technique, a tubing termination assembly is used to terminate control line tubing from a downhole safety valve at a wellhead component. The tubing termination assembly utilizes a seal ring to form a seal around control line tubing extending from a port through a wellhead component. A seating surface is provided in the seal ring, rather than in the wellhead component, to which a seal member is abutted to form the seal with the control line tubing. The seal ring also comprises a threaded portion to enable a threaded member to urge the seal member against the seating surface.

The invention relates to a remote control device and a method of an offshore oil and gas well safety valve, belonging to the field of safety valve remote control. The remote control device of the offshore oil and gas well safety valve comprises a master control center upper computer, GPRS (General Packet Radio Service) modules, antennae, a safety valve single chip control device and electromagnetic relays, wherein the land master control center upper computer is sequentially connected with a first GRPS module, a first antenna, a second GPRS module, a second antenna, the safety valve single chip control device, a first electromagnetic relay, a second electromagnetic relay and a third electromagnetic relay; the three electromagnetic relays are in parallel connections; and the first electromagnetic relay is connected with a subsurface safety valve, the second electromagnetic relay is connected with a wellhead safety valve, and the third electromagnetic relay is connected with a well casing safety valve. The invention improves the safety and the automation level of the production of the offshore oil and gas well platform, and has the advantages of powerful function, simple installation, convenient use, safety and reliability.

A flow tube exercising tool and method for use are described for actuating the flow tube of a downhole safety valve in order to remove build ups of scale and debris from the safety valve and ensure proper operation. The exercising tool provides a lower engagement portion that underlies the lower end of the safety valve flow tube so that upward movement of portions of the exercising tool will move the flow tube upwardly. An upper engagement portion overlies the upper end of the flow tube so that downward movement of portions of the exercising tool will move the flow tube downwardly. Only a single trip of the flow tube exercising tool is necessary to accomplish multiple upward and downward movements of the flow tube.

A communication tool apparatus is described which is adapted to provide selective communication of control fluid through a downhole device such as a safety valve. The downhole safety valve is a tubing retrievable subsurface safety valve (“TRSSSV”). The communication tool may be run downhole and within the TRSSSV. Once within the TRSSSV, the communication tool apparatus activates a cutting device within the TRSSSV such that communication of control fluid through the TRSSSV is possible. A replacement safety valve run on a wireline may then be inserted into the TRSSSV and be operated via the control fluid line, as a new communication path created by the communication tool described herein. A method of using the communication tool apparatus is also described.

A communication tool apparatus is described which is adapted to provide selective communication of control fluid through a downhole tool, such as a safety valve. The downhole safety valve is a tubing retrievable subsurface safety valve (“TRSSSV”). The communication tool may be run downhole and within the TRSSSV. Once within the TRSSSV, the communication tool apparatus activates a cutting device within the TRSSSV such that communication of control fluid through the TRSSSV is possible. A replacement safety valve run on a wireline may then be inserted into the TRSSSV and be operated via the control fluid line, as a new communication path created by the communication tool described herein. A method of using the communication tool apparatus is also described.

The invention discloses a pressure control type intelligent production pipe column capable of injecting acid by layer selection and a production method. The production pipe column comprises an upper-section pipe column provided with an underground safety valve, a passing cable packer and an electric submersible pump, and a lower-section releasing layered pipe column provided with a releasing tool, a positioning seal, a first inserting seal, a second inserting seal and a guide screw plug; pressure control switches are arranged at a plurality of positions of the production pipe column respectively; and the production method comprises the steps of manufacturing the production pipe column, mounting the pressure control switches, putting in the releasing layered pipe column and the upper-section pipe column, remotely controlling and pressurizing, digging in turn and exploring water, acidifying at a fixed point and the like. The pressure control type intelligent production pipe column and the production method, disclosed by the invention, have the advantages that the production pipe column can work only if the releasing layered pipe column is put for one time, and an instrument or the pipe column does not need to be detached; the technical difficulty of large-inclination well layered water control and oil extracting can be effectively solved; water finding, water control, layer-adjusting production and fixed-point acidifying of different oil layers are realized through remotely controlling the pressure control switches on the ground; and the acid can effectively enter a target reservoir stratum in an acidifying process.