摘要:
The invention is generally directed to a curved flapper and seat for use in a subsurface safety valve. The flapper is biased to a normally closed position to prevent fluid flow through the wellbore. The curved flapper has a sealing surface for engaging a corresponding sealing surface on a seat when the flapper is in its closed position. The sealing surface of the flapper is configured to contact the sealing surface of the seat along a sinusoidal sealing line, or seam, such that the reactive force from the seat is normal to the sinusoidal seating line. In one aspect, the sealing surface of the flapper has a convex spherical configuration relative to the seat. The sealing surface of the seat, in turn, has a concave conical shape relative to the flapper. When well conditions dictate, a resilient soft seat may optionally be used, and is disposed on the seat proximate the sinusoidal seating line.
摘要:
An apparatus and method of operating devices (such as devices in a wellbore or other types of devices) utilizes actuators having expandable or contractable elements. Such expandable or contractable elements may include piezoelectric elements, magnetostrictive elements, and heat-expandable elements. Piezoelectric elements are expandable by application of an electrical voltage; magnetostrictive elements are expandable by application of a magnetic field (which may be generated by a solenoid in response to an electrical current); and heat-expandable elements are expandable by heat energy (e.g., infrared energy or microwave energy). Expandable elements are abutted to an operator member such that when the expandable element expands, the operator member is moved in a first direction, and when the expandable element contracts, the operator member moves in an opposite direction.
摘要:
An actuator assembly includes an operating actuator and a holding actuator that are engageable with an operator member of a device. The operating actuation is cycled between on and off states to move the operator member in incremental steps, and the holding actuator is maintained in an active state to maintain or latch the current position of the operator member. Each of the operating and holding actuators may include one of the following: a solenoid actuator; and an actuator including one or more expandable elements, such as a piezoelectric element, a magnetostrictive element, and a heat-expandable element.
摘要:
An improved fluid actuator is provided. The fluid actuator (25) comprises a variable volume fluid chamber (124). A first tube (162) is fixed within the variable volume fluid chamber (124). The first tube (162) has a first sealing surface (142) and a second sealing surface (144). A piston (100) is slidably disposed within the variable volume fluid chamber (124) and slidably movable over the first tube (162) between a first position and a second position. The piston (100) comprises a first sealing surface (140) and a second sealing surface (146). The piston first sealing surface (140) and the first tube first sealing surface (142) cooperate to form a seal between the piston (100) and the first tube (162) when the piston (100) is in the first position. The piston second sealing surface (146) and the first tube second sealing surface (144) cooperate to form a seal between the piston (100) and the first tube (162) when the piston (100) is in the second position.
摘要:
The present invention relates to a subterranean well annulus pressure safety valve. In one embodiment, the valve is full opening to permit complete access therethrough of wireline and other remedial tools, and contains the annulus safety valve members completely offset from the central housing. The invention also relates to an annulus safety valve wherein a series of valve elements are placed exterior of a central housing and may be staged to open in series upon incremental increase of pressure thereacross. The annulus safety valve also provides pressure equalization means to equalize pressure across the valve cluster prior to opening of the cluster. The annulus safety valve also has selectively disengagable sealing plug means therein which may be removed while the valve is in the well to increase total fluid flow area through the valve components of the apparatus. A method of controlling an annular area interior of casing within a well using the annulus safety valve also is disclosed.
摘要:
A subsurface safety valve assembly for connection in a well pipe, including a valve member disposed in a valve body having a bore or passageway therethrough, a pair of spaced apart and oppositely facing valve seats in surrounding relation to an intermediate portion of the passageway, the valve positioned thereat and operable to open and close said passageway, a space within the valve body outwardly of the passageway therethrough, a control frame guidably movable within the space and having a piston associated therewith adapted to define first and second variable capacity pressure chambers within the space, means for moving the control frame in opposite longitudinal directions to open and close the valve, the means for moving the control frame including first and second ports, the first port providing fluid communication between the first variable capacity pressure chamber and an external source of pressure fluid, the second port providing fluid communication between the second variable capacity pressure chamber and the passageway through the valve body.
摘要:
An apparatus and method of operating devices (such as devices in a wellbore or other types of devices) utilizes actuators having expandable or contractable elements. Such expandable or contractable elements may include piezoelectric elements, magnetostrictive elements, and heat-expandable elements. Piezoelectric elements are expandable by application of an electrical voltage; magnetostrictive elements are expandable by application of a magnetic field (which may be generated by a solenoid in response to an electrical current); and heat-expandable elements are expandable by heat energy (e.g., infrared energy or microwave energy). Expandable elements are abutted to an operator member such that when the expandable element expands, the operator member is moved in a first direction, and when the expandable element contracts, the operator member moves in an opposite direction.
摘要:
The invention provides an eccentric subsurface safety valve that may include an eccentric body member having a thick side, a thin side, and a longitudinal bore therethrough. A closure member, such as a curved flapper, is mounted within the body member to control fluid flow through the longitudinal bore, and is moveable between an open and a closed position. The curved flapper may be disposed within a recess in the thick side of the eccentric body member when in its open position. A valve actuator, such as a flow tube, may be disposed within the body member and remotely shiftable to move the curved flapper between its open and closed positions. The flow tube may be shifted downwardly in response to movement of a piston. At least one return spring and/or a contained volume of pressurized gas may be provided to urge the flow tube away from the curved flapper. The piston may be connected to an eccentric plate slidably disposed about the flow tube and between a first and a second shoulder on the flow tube. A glide spring may be disposed about the flow tube and between the eccentric plate and one of the first and second flow tube shoulders to absorb forces imparted to the flow tube by the curved flapper upon closing. The present invention allows an increase in the inside diameter of the valve without increasing the outside diameter of the valve.
摘要:
A reduced travel operating mechanism for downhole tools is provided. The reduced travel operating mechanism (57) includes a load ratio system (59) which may include compression ring (102) disposed within circumferential guide pocket (123) and a linkage system (61) disposed within mechanism pocket (125). The linkage system (61) may include first link (112), master link (114), and second link (116) coupled between compression ring (102) and connecting member (118). A loading system (63), which may include a hydraulic piston (100), acts on compression ring (102) to move compression ring (102) a first distance. Connecting member (118) moves a second distance in response to the movement of compression ring (102) a first distance. The linkage system (61) may operate such that the second distance is greater than the first distance or operate such that the first distance is greater than the second distance. A biasing system (139), which may include springs (104), may be included to bias compression ring (102) in a first position.
摘要:
A subsurface safety valve. During normal well flowing conditions, the valve is spring biased to its open position. If the difference in fluid pressure flowing through the valve as compared to fluid pressure exterior to the valve exceeds a preselected value, a pressure sensitive bellows will be actuated to close the valve. A latch mechanism is provided to prevent undesired closure of the safety valve by acceptable pressure transients resulting from normal changes in well operating conditions. An alternative embodiment of the valve responds to an electromagnetic signal from the well surface.