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| Number | Title | Issue Date |
| 7431079 | Retrievable oil and or gas well blowout preventer A well blowout prevention apparatus that can be inserted into the well bore of a subterranean well, to confine fluid in the well when the fluid experiences or exerts a pressure surge, is described. Methods of using the well blowout prevention apparatus are also desc... | 10/07/2008 |
| 7059405 | Methods of treating subterranean formations using low-molecular-weight fluids The present invention relates to systems and methods useful in subterranean treatment operations. Examples of methods of the present invention include methods for fracturing a portion of a subterranean formation penetrated by a well bore; methods of enhancing produc... | 06/13/2006 |
| 5690172 | Seal-sub packer and a setting tool therefor The invention relates to a seal-sub packer assembly which is formed by a two-mandrel packer and a setting tool which positions the packer within the casing. A lower mandrel of the packer is provided with internal threads for engagement with the setting to... | 11/25/1997 |
| 5314014 | Packer and valve assembly for temporary abandonment of wells Preferential disconnection of a valve-actuating subassembly from a temporary abandonment safety valve and packer assembly is provided by stops which limit relative rotation between the valve-actuating subassembly within the valve along with a locking coll... | 05/24/1994 |
| 5146993 | Packing mechanism for subterranean wells A downhole packing mechanism for achieving sealed engagement with the bore of a well conduit comprises a mandrel positionable within a well by a tubing string. Surrounding the mandrel is a tubular body assemblage which is connectable to the mandrel for ru... | 09/15/1992 |
| 4848459 | Apparatus for installing a liner within a well bore A packer setting tool, a packer assembly and an attached liner assembly are lowered into a well bore at a desired depth to fix the liner therein. Cement is pumped down a tubing string, through the packer, the lining, check valves and forced upwardly in th... | 07/18/1989 |
| 4844154 | Well packer A well packer for sealing an annular space within a well bore around a tubing string including a tubular mandrel, an expandable seal assembly on the mandrel for sealing around the mandrel with a well bore wall, a slip assembly on the mandrel for releasabl... | 07/04/1989 |
| 4796698 | Landing nipple and plug A drilling template for multiple wells has a dummy post on the template associated with each wellhead position and a wellhead connector is transferable between the dummy post and wellhead during completion and workover operations. A subsea wellhead is pro... | 01/10/1989 |
| 4709758 | High temperature packer for well conduits A packer for effecting steam treatment of a production formation of a subterranean well comprises an insulated mandrel which is slidably inserted within the bore of an inner tubular body assembly. An outer operative tubular assembly surrounds the inner as... | 12/01/1987 |
| 4665977 | Tension set seal bore packer A seal bore packer comprising a packer subassembly which can be employed with either wireline or tubing manipulatable packer setting subassemblies is disclosed. Packing elements and slips on a packer subassembly are expanded when relative axial forces are... | 05/19/1987 |
| 4601333 | Thermal slide joint A slide joint is shown which is used to provide a floating seal between an inner floating member and a surrounding conduit in a well bore. The floating member has a clutch element which is engaged at one end thereof. A circumferential, compressible packin... | 07/22/1986 |
| 4588030 | Well tool having a metal seal and bi-directional lock A well tool, for setting in a nipple having a locking notch, including a body with initially retracted first and second locking dogs with a threaded actuator for moving the first and second dogs axially relative to each other and into engagement with the ... | 05/13/1986 |
| 4548264 | High temperature well packer A well packer is shown which is particularly suitable for use in high temperature well environments, such as in fire flooding and steam injection secondary recovery techniques. The well packer has a central mandrel which extends within an outer assembly, ... | 10/22/1985 |
| 4524825 | Well packer The packer of the present invention includes mandrel means having first ratchet means and lug means disposed thereon, second ratchet means and drag spring means associated with tubular housing means surrounding said mandrel means, said housing means inclu... | 06/25/1985 |
| 4427063 | Retrievable bridge plug A retrievable bridge plug of the type having upper and lower anchors and an elastomeric packer for sealing a well casing. Drill string manipulation of the plug body effects packer compression and sealing. A ratchet maintains packer compression when engage... | 01/24/1984 |
| 4411314 | Attachment means for use for insertion and retrieval of a casing packer Apparatus is provided for use with a packer positionable in a casing in which the packer has an upstanding male location member having a noncircular peripheral configuration having a circumferential slot adjacent the upper end, a female insertion member h... | 10/25/1983 |
| 4408662 | Retrievable packer for oil well casing A retrievable packer for use in an oilwell casing, the packer having a central shaft with means at the upper end for attachment of an insertion or retrieval tool, an upper body portion having an opening receiving the shaft and having an integral downwardl... | 10/11/1983 |
| 4336841 | Mechanical tubing anchor A tubing anchor for anchoring a well tubing in an outer conduit which includes slips and upper and lower cones. A threaded connection is connected to at least one of the cones for moving the cones towards and away from each other for setting and releasing... | 06/29/1982 |
| 4296806 | High temperature well packer A well packer for use in geothermal wells or stem injection wells. The packer can be anchored to the inner wall of a casing string to resist differential pressure in either direction. The anchoring means includes a single set of slip elements which are hy... | 10/27/1981 |
| 4274489 | Retrievable bridge plug and method of setting A bridge plug tool is disclosed, for temporarily plugging off a well casing to perform a downhole operation, such as cementing, or acidizing. The tool includes a mandrel having separate thread segments thereon. During running in of the tool, one thread se... | 06/23/1981 |
| 4146094 | Tubular one-way closure for injecting a material into a hole A tubular one-way closure for injecting a material, particularly synthetic plastic foam material, into a hole has a throttle channel through which the material is to be injected, and a central tube rotatable about its axis and movable in its axial directi... | 03/27/1979 |
| 4071084 | Well packer Disclosed is a retrievable, weight set well packer which may be tightened in set configuration by rotation of the tubing string, and which may be released from set configuration by longitudinal movement of the tubing string. Locking means maintain the pac... | 01/31/1978 |
| 4058162 | Well tool adapted to be locked within and sealed with respect to the bore of the well conduit There is disclosed well apparatus which comprises a well conduit having a bore therethrough and a well tool having means thereon for releasably locking it within and sealing it with respect to the bore of the well conduit when lowered therein.... | 11/15/1977 |
| 4018275 | Anchoring device for well tools An improved anchoring device for well tools including installing and actuating apparatus for providing visual indication at the ground surface verifying proper latching and locking of the device in a casing string. The anchoring device includes a tubular ... | 04/19/1977 |
