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| Number | Title | Issue Date |
| 7270181 | Downhole surge pressure reduction and filtering apparatus The present invention provides a downhole cementing apparatus run into a borehole on a tubular. The apparatus is constructed on the pipe in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilize the fluid pathway of t... | 09/18/2007 |
| 7243742 | Drill pipe screen A retrievable drill pipe screen is adapted for releasable connection within a drill pipe string. The screen has a planar support plate for connecting a perforated tubular screen body to a fish neck wherein the plane of the planar support plate is generally parallel ... | 07/17/2007 |
| 7096946 | Rotating blast liner An improved blast liner assembly for use in gravel packing or fracturing operations wherein solid materials, in slurry form, are flowed out of the flowbore of a working tool and into the annulus of a wellbore. The blast liner is a cylindrical member that provides a ... | 08/29/2006 |
| 6202742 | Pack-off device for use in a wellbore having a packer assembly located therein The present invention provides a gravel pack assembly for use in a wellbore having a packer positioned therein with a minimum inside diameter and a primary packing seal. In one embodiment, the gravel pack assembly comprises a pack-off conduit that is coup... | 03/20/2001 |
| 5676208 | Apparatus and methods of preventing screen collapse in gravel packing operations A gravel packing apparatus and associated method of gravel packing a subterranean well prevents screen collapse without requiring sealing engagement of a washpipe with an external seal, without requiring reliance solely on differential pressure, and witho... | 10/14/1997 |
| 5579844 | Single trip open hole well completion system and method A well completion system which includes a production packer assembly, production tubing sealed to the packer assembly, and an isolation assembly coupled with the packer assembly. The isolation assembly includes an isolation pipe received within a producti... | 12/03/1996 |
| 5327960 | Gravel pack installations for wells A gravel pack screen assembly includes a bit or sub having a flow passage which may accept a wash pipe. The wash pipe may be inserted past a flapper-type closure member which moves to a closed position upon withdrawal of the wash pipe after completion of ... | 07/12/1994 |
| 4860831 | Well apparatuses and methods Device combinations and methods for wellbore operations for simplifying production methods and workover operations and for production from a failed secondary zone. Using a commercially available prior art coil tubing unit, a coil tubing string is run into... | 08/29/1989 |
| 4825944 | Gravel pack completion for in situ leach wells A method and apparatus for completing an in situ leach well to prevent production of sand and to insure minimum permeability damage to the ore bearing zone during casing and cementing operations. A hole for the casing is drilled to and terminated at a poi... | 05/02/1989 |
