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| Number | Title | Issue Date |
| 8104540 | Completion tool A differential pressure operated blanking tool includes a Y-tool having first and second limbs connected together via a throat. A ball valve is selectively positionable to close one or other limb of the Y-tube against fluid flow. A housing has an opening in one side... | 01/31/2012 |
| 7810571 | Downhole lubricator valve A ball type downhole lubricator valve features a ball rotating on its axis to open or close with control line pressure to an actuating piston. The ball is also shiftable to a locked open position. A cage surrounds the ball and retains opposed seats to it. The cage i... | 10/12/2010 |
| 7261161 | Well testing system A well testing system and well testing method is described which can be operated as a closed system with no production of hydrocarbons outside the well or gas can be separated and flared at surface giving minimal environmental impact with the liquid hydrocarbon bein... | 08/28/2007 |
| 7108073 | Multiple interventionless actuated downhole valve and method The multiple interventionless actuated downhole valve includes a valve movable between an open and a closed position to control communication between an annular region surrounding the valve and an internal bore and more specifically controlling communication between... | 09/19/2006 |
| 6668933 | Ball valve seat and support A ball valve assembly has a lower support, an upper seat, a spherical ball, and linkages for rotating the ball. The lower support has a spherical support surface for the ball. The lower support also has a pair of guides for maintaining alignment of the ba... | 12/30/2003 |
| 6619388 | Fail safe surface controlled subsurface safety valve for use in a well The present invention is a surface controlled subsurface safety valve (SCSSV) for use in a well, preferably a hydrocarbon producing well. The SCSSV comprises a valve body having a longitudinal bore for fluid to flow through, a bore closure assembly, a pre... | 09/16/2003 |
| 6343650 | Test, drill and pull system and method of testing and drilling a well A test, drill and pull system for testing a well formation or zone of interest and further drilling of the well in a single trip into the wellbore. The system includes a surface readout tester valve, a rotation-operated reversing valve, a resettable packe... | 02/05/2002 |
| 6302216 | Flow control and isolation in a wellbore A method and apparatus of performing fluid loss, well isolation control, and flow control in a well having multiple zones. A multi-valve system having a plurality of valve assemblies is installed into the well. The multi-valve system provides fluid loss a... | 10/16/2001 |
| 6024173 | Inflatable shifting tool A shifting tool for moving a movable member attached to a device in a downhole tool includes a body having a bore and a feed port connected to the bore. A diaphragm is mounted on the body for radial expansion to engage the movable member. The diaphragm is... | 02/15/2000 |
| 5957206 | Plug for operating a downhole device using tubing pressure A plug for actuating a movable member of a device in a wellbore includes a housing adapted to be lowered into the wellbore and a seal member mounted on the housing. The seal member is arranged to engage the movable member such that a pressure applied to t... | 09/28/1999 |
| 5836394 | Well regeneration apparatus A well regeneration apparatus and method of accomplishing same are provided. A scrubber pump is associated with a device for mechanically cleaning a well casing for washing and scrubbing a filter pipe portion of the well casing, and a gravel bed that surr... | 11/17/1998 |
| 5228516 | Tester valve A reciprocating full flow tester valve is provided with a shock absorber and tolerance adjustment device for absorbing an impact between a power mandrel of the tool and an operating assembly of the tool. An improved hydraulic impedance system is also prov... | 07/20/1993 |
| 5111883 | Vacuum apparatus and process for in-situ removing underground liquids and vapors An apparatus 10 for removing underground contaminants from a contaminated subsurface area 16 is provided. The apparatus 10 includes a wellbore 12 aligned in the contaminated subsurface area for releasing predetermined substances into selected areas of the... | 05/12/1992 |
| 5020592 | Tool for treating subterranean wells A method and apparatus for treating subterranean wells includes a tool supported on a one-piece support tube which operates to raise and lower the tool in the well to a position where well treatment is required. The tool provides inflatable packers and a ... | 06/04/1991 |
| 4627492 | Well tool having latching mechanism and method of utilizing the same A well tool having reciprocating portions can be locked in a predetermined position by a latching mechanism which is responsive to externally applied pressure, as opposed to mere movement of the reciprocating elements to the predetermined position. The ac... | 12/09/1986 |
| 4582140 | Well tool with selective bypass functions A downhole tool such as a formation tester valve which provides a bypass while allowing a choice of several possible functions of this bypass to be made by rearrangement of the parts of the tool. In a first arrangement, a bypass is provided which is open ... | 04/15/1986 |
| 4421172 | Drill pipe tester and safety valve A spherical valve member type having a drill pipe tester valve and a moving apparatus to provide for moving the spherical valve member axially relative to the housing between its said open and closed positions, thereby permitting downward forces exerted u... | 12/20/1983 |
| 4420045 | Drill pipe tester and safety valve A drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, ... | 12/13/1983 |
| 4333530 | Method and apparatus for cementing a casing Method and apparatus for cementing a casing in a borehole in two distinct stages by connecting the tool of the invention in series relationship respective to the casing and running the entire tool string downhole into the borehole. The tool which connects... | 06/08/1982 |
| 4212355 | Tubing manipulated test valve and latch assembly A test valve assembly is provided which is adapted to be lowered on a tubular string between upper and lower tubular sections into position within a blowout preventer stack at the upper end of a well bore of a subterranean oil or gas well. The apparatus h... | 07/15/1980 |
| 4076077 | Weight and pressure operated well testing apparatus and its method of operation A method and apparatus are presented which are particularly useful in testing the production capabilities of offshore oil wells. The apparatus includes a normally closed, weight operated valve which opens a preset delay after the weight operated valve is ... | 02/28/1978 |
