초록 ▼

In a broad aspect, the invention may include a subsurface safety valve for controlling a fluid flow through a well conduit. The valve may include a housing that has a bore and is disposed within an annulus defined by the space between the well conduit and the housing. The valve may also have a valve

In a broad aspect, the invention may include a subsurface safety valve for controlling a fluid flow through a well conduit. The valve may include a housing that has a bore and is disposed within an annulus defined by the space between the well conduit and the housing. The valve may also have a valve closure member that is movable between an open position and a closed position, and adapted to restrict the fluid flow through the bore when in the closed position. The valve may also include a flow tube that is moveably disposed within the housing and adapted to shift the valve closure member between its open and closed positions. The valve may also include a piston that is moveably disposed within a cylinder in the housing and in mechanical communication with the flow tube. The piston may have a first seal disposed adjacent an upper end of the piston, a second seal disposed adjacent a lower end of the piston, and a third seal disposed between the first and second seals. The valve may also have a failsafe passageway in fluid communication with a balance pressure line and a portion of the piston between the first and third seals. The invention may also include a detachable piston arrangement that is balanced to the annulus or the surface.

대표청구항 ▼

In a broad aspect, the invention may include a subsurface safety valve for controlling a fluid flow through a well conduit. The valve may include a housing that has a bore and is disposed within an annulus defined by the space between the well conduit and the housing. The valve may also have a valve

In a broad aspect, the invention may include a subsurface safety valve for controlling a fluid flow through a well conduit. The valve may include a housing that has a bore and is disposed within an annulus defined by the space between the well conduit and the housing. The valve may also have a valve closure member that is movable between an open position and a closed position, and adapted to restrict the fluid flow through the bore when in the closed position. The valve may also include a flow tube that is moveably disposed within the housing and adapted to shift the valve closure member between its open and closed positions. The valve may also include a piston that is moveably disposed within a cylinder in the housing and in mechanical communication with the flow tube. The piston may have a first seal disposed adjacent an upper end of the piston, a second seal disposed adjacent a lower end of the piston, and a third seal disposed between the first and second seals. The valve may also have a failsafe passageway in fluid communication with a balance pressure line and a portion of the piston between the first and third seals. The invention may also include a detachable piston arrangement that is balanced to the annulus or the surface. 99, 19671100, Swift; US-3354955, 19671100, Berry; US-3477506, 19691100, Malone, 166/207; US-3489220, 19700100, Kinley, 166/277; US-3583200, 19710600, Cvijanovic et al., 072/393; US-3669190, 19720600, Sizer et al., 166/315; US-3689113, 19720900, Blaschke, 285/090; US-3691624, 19720900, Kinley, 029/523; US-3712376, 19730100, Owen et al., 166/277; US-3746091, 19730700, Owen et al., 166/207; US-3776307, 19731200, Young, 166/125; US-3780562, 19731200, Kinley, 072/479; US-3785193, 19740100, Kinley et al., 072/393; US-3820370, 19740600, Duffy, 072/075; US-3948321, 19760400, Owen et al., 166/277; US-3977076, 19760800, Vieira et al., 030/103; US-3982724, 19760900, Citrin; US-4216802, 19800800, Bonnes et al.; US-4319393, 19820300, Pogonowski, 029/434; US-4349050, 19820900, Bergstrom et al., 138/147; US-4359889, 19821100, Kelly, 072/062; US-4362324, 19821200, Kelly, 285/119; US-4382379, 19830500, Kelly, 073/046; US-4387502, 19830600, Dom, 029/568; US-4407150, 19831000, Kelly, 072/061; US-4414739, 19831100, Kelly, 029/727; US-4445201, 19840400, Pricer, 365/154; US-4450612, 19840500, Kelly, 072/062; US-4470280, 19840900, Kelly, 072/061; US-4483399, 19841100, Colgate, 166/308; US-4487630, 19841200, Crook et al., 075/123.B; US-4502308, 19850300, Kelly, 072/058; US-4505142, 19850300, Kelly, 072/054; US-4505612, 19850300, Shelly, Jr., 405/101; US-4567631, 19860200, Kelly, 029/157.3C; US-4581617, 19860400, Yoshimoto et al., 346/108; US-4626129, 19861200, Kothmann et al., 405/043; US-4773451, 19880900, Hegler et al.; US-4807704, 19890200, Hsu et al., 166/313; US-4866966, 19890900, Hagen, 072/075; US-4883121, 19891100, Zwart, 166/217; US-4976322, 19901200, Abdrakhmanov et al., 175/057; US-4997320, 19910300, Hwang, 408/022; US-5014779, 19910500, Meling et al., 166/055.7; US-5052483, 19911000, Hudson, 166/055; US-5052849, 19911000, Zwart, 403/300; US-5156209, 19921000, McHardy, 166/324; US-5267613, 19931200, Zwart et al., 166/178; US-5271472, 19931200, Leturno, 175/107; US-5301760, 19940400, Graham, 175/061; US-5307879, 19940500, Kent, 166/382; US-5322127, 19940600, McNair et al., 166/313; US-5348095, 19940900, Worrall et al., 166/380; US-5366012, 19941100, Lohbeck, 166/277; US-5409059, 19950400, McHardy, 166/208; US-5472057, 19951200, Winfree, 175/057; US-5497620, 19960300, Stobbe; US-5520255, 19960500, Barr et al., 175/024; US-5553679, 19960900, Thorp, 175/073; US-5560426, 19961000, Trahan et al., 166/120; US-5636661, 19970600, Moyes, 137/614.2; US-5667011, 19970900, Gill et al., 166/295; US-5706905, 19980100, Barr, 175/061; US-5785120, 19980700, Smalley et al., 166/055; US-5887668, 19990300, Haugen et al., 175/079; US-5901789, 19990500, Donnelly et al., 166/381; US-5924745, 19990700, Campbell, 285/090; US-5960895, 19991000, Chevallier et al., 175/027; US-5979571, 19991100, Scott et al., 175/061; US-6029748, 20000200, Forsyth et al., 166/380; US-6070671, 20000600, Cumming et al., 166/381