| Patent Number |
Title Of Patent |
Date Issued |
| 7552774 |
Control line hydrostatic minimally sensitive control system |
June 30, 2009 |
| A control system for a downhole tool, such as a subsurface safety valve, features an operating piston that is insensitive to tubing pressure in the valve. The hydrostatic forces from the single control line from the surface are significantly reduced with a branch line to a piston bottom |
| 6427778 |
Control system for deep set subsurface valves |
August 6, 2002 |
| The hydraulic control system for operating a flow tube in a subsurface safety valve is disclosed. An isolation piston is used in conjunction with an operating control line and an engagement control line. Both control lines run from the surface. The isolation piston is spring loaded to |
| 6283477 |
Annular chamber seal |
September 4, 2001 |
| Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a subsurface safety valve. Res |
| 6260850 |
Annular chamber seal |
July 17, 2001 |
| Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a subsurface safety valve. Res |
| 6109351 |
Failsafe control system for a subsurface safety valve |
August 29, 2000 |
| An improved control system, particularly useful for SSVs, is disclosed. The control system has an operating piston which acts on a flow tube to move a flapper to an open position. The flapper is spring-loaded to close when the flow tube moves up. A return spring acts on the piston to lif |
| 5918858 |
Undulating transverse interface for curved flapper seal |
July 6, 1999 |
| The invention relates to a pair of matched surfaces usable in sealing a downhole subsurface safety valve. The continuous seat and the matching flapper profile feature a surface that is around its periphery transverse to the longitudinal axis of the seat and the flapper. The seating surfa |
| 5799949 |
Annular chamber seal |
September 1, 1998 |
| Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a subsurface safety valve. Res |
| 5682921 |
Undulating transverse interface for curved flapper seal |
November 4, 1997 |
| The invention relates to a pair of matched surfaces usable in sealing a downhole subsurface safety valve. The continuous seat and the matching flapper profile feature a surface that is around its periphery transverse to the longitudinal axis of the seat and the flapper. The seating surfa |
| 5496044 |
Annular chamber seal |
March 5, 1996 |
| Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a subsurface safety valve. Res |
| 4423777 |
Fluid pressure actuated well tool |
January 3, 1984 |
| A packer for a subterranean well has slip elements and elastomeric seal elements which are respectively radially expandable into engagement with a well conduit wherein the packer is mounted in surrounding relationship to an inner sleeve which is rigidly interconnectable to a second condu |
| 4311196 |
Tangentially loaded slip assembly |
January 19, 1982 |
| An improved slip assembly is provided for grasping the interior wall of a well conduit to secure a tool against longitudinal movement. Interengaging means, such as upper and lower slip rings surround the tool and have T-shaped ears projecting from the opposed lower and upper ends of the |
| 4290484 |
Seal receptacle assembly |
September 22, 1981 |
| A seal receptacle assembly is provided for affixation on a well conduit. The seal receptacle assembly can be provided to permit telescopic contraction and expansion of the well conduit in response to heating, cooling, or pressurization of the well conduit. The seal receptacle assembl |
