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| Number | Title | Issue Date |
| 7347288 | Ball operated by-pass tool for use in drillstring A by-pass tool for incorporation in a drillstring is adjustable between an inactive mode in which it allows fluid flow lengthwise of the drillstring during normal drilling operation, and an active by-pass mode when drilling is to be interrupted. The tool includes an... | 03/25/2008 |
| 7325621 | Method and apparatus for ECP element inflation utilizing solid laden fluid mixture An inflatable element utilizing a solid or particulate laden fluid as an expansion media. A fluid component of the solid or particulate laden fluid is exhausted from a defined area of the element to leave substantially only particulate matter therein to maintain the... | 02/05/2008 |
| 7322432 | Fluid diverter tool and method The present invention relates to a diverter tool used in a pipe string used to lower a liner and a cutting apparatus on the end thereof into a partially cased wellbore. The diverter tool has a diverter body that defines a longitudinal flow passage and has the divert... | 01/29/2008 |
| 7234522 | Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore A float system for use in cementing a casing in a wellbore. The wellbore is drilled with a drill bit attached to the casing. The drill bit is removed after the wellbore is drilled. The float system is lowered into the casing after the drill bit is removed. The float... | 06/26/2007 |
| 7201232 | Washpipeless isolation strings and methods for isolation with object holding service tool An isolation string having an upper packer and an isolation pipe in mechanical communication with the upper packer, the isolation pipe comprises an operable valve and an object activated valve. An object holding service tool is adapted to release an object to activa... | 04/10/2007 |
| 7198109 | Double-pin radial flow valve A valve with the following components: a pipe; an inner sub connected to the pipe; an outer sub connected to the pipe, wherein the inner and outer subs are concentric and define a sub annulus; a conduit between the sub annulus and an inside diameter of the inner sub... | 04/03/2007 |
| 7178603 | Method and apparatus for ECP element inflation utilizing solid laden fluid mixture An inflatable element utilizing a solid or particulate laden fluid as an expansion media. A fluid component of the solid or particulate laden fluid is exhausted from a defined area of the element to leave substantially only particulate matter therein to maintain the... | 02/20/2007 |
| 7152678 | System and method for downhole operation using pressure activated valve and sliding sleeve An isolation system for producing oil and gas from one or more formation zones and methods of use are provided comprising one or more pressure activated valve and one or more tool shiftable valve. The tool shiftable valve may be actuated before or after actuation of... | 12/26/2006 |
| 7124824 | Washpipeless isolation strings and methods for isolation An isolation string having: an upper packer; and an isolation pipe in mechanical communication with the upper packer, wherein the isolation pipe comprises a pressure activated valve and an object activated valve. A method having: running-in an isolation string on a ... | 10/24/2006 |
| 7108067 | Method and apparatus for wellbore fluid treatment A tubing string assembly for fluid treatment of a wellbore includes substantially pressure holding closures spaced along the tubing string, which each close at least one port through the tubing string wall. The closures are openable by a sleeve drivable through the ... | 09/19/2006 |
| 7090004 | Cement float A cement float for use in a wellbore tubing string includes: a mandrel having a bore extending from a first end to a second end including a fluid flow control device therein, and outer surfaces defining a tapering outer diameter from the first end to the second end;... | 08/15/2006 |
| 7063142 | Method of applying an axial force to an expansion cone A method of applying an axial force to a first piston positioned within a first piston chamber including applying an axial force to the first piston using a second piston positioned within the first piston chamber. ... | 06/20/2006 |
| 7044221 | Apparatus for coupling a tubular member to a preexisting structure An apparatus for coupling a tubular member to a preexisting structure. ... | 05/16/2006 |
| 7040396 | Apparatus for releasably coupling two elements An apparatus for coupling two elements including an outer tubular member defining one or more outer tubular member slots, an inner tubular member defining one or more inner tubular member slots positioned within the outer tubular member, and a coupling assembly for ... | 05/09/2006 |
| 7036581 | Wellbore seal device A device for providing a seal between two tubular member in a downhole environment is presented. The sealing device provides the capability of “boosting” or improving the seal, in the event of hydraulic pressure increases from above or below the seal. ... | 05/02/2006 |
| 6971450 | Completion apparatus and methods for use in wellbores An apparatus and methods for preventing the accumulation of unwanted materials in an enlarged inner diameter portion of a casing or housing. In one aspect of the invention, a sleeve is disposed in the housing to isolate an annular area defined by the outer surface s... | 12/06/2005 |
| 6966370 | Apparatus for actuating an annular piston An apparatus comprising a first tubular member; a second tubular member positioned within and coupled to the first tubular member; a first annular piston chamber defined by the space between the first and second tubular members; an annular piston movably coupled to ... | 11/22/2005 |
| 6959762 | Method and apparatus for formation damage removal A method for evaluating the permeability and formation damage in the porous rock around a well bore. This method relates to the use of a single string coiled tubing and a down hole assembly which includes a microcontroller, an electrically operable fluid control val... | 11/01/2005 |
| 6923255 | Activating ball assembly for use with a by-pass tool in a drill string A by-pass tool to be incorporated in a drill string, in combination with an activating ball assembly operative to adjust the tool between an activated mode and a de-activated mode. The tool has a valve seat engageable by the activating ball assembly to move its slee... | 08/02/2005 |
| 6651743 | Slim hole stage cementer and method A small diameter stage cementer assembly 10 and a hydraulically operated packer collar stage cementer 110, including a cementer housing 12 for interconnection with a casing string 14 positionable in a slim-hole wellbore for a cementing operation. The ceme... | 11/25/2003 |
| 6634423 | Lifting top drive remote control cement head A lifting top drive sub sea staging cement head in which cement slurry flows from outside into its central bore, thru a rotating swivel connection. The cement head has a rotatably indexable reservoir cylinder with multiple cells which may be loaded with b... | 10/21/2003 |
| 6622798 | Method and apparatus for maintaining a fluid column in a wellbore annulus A method and apparatus for maintaining the fluid column in an annulus are provided. The fluid column support, or fluid column seal is disposed about a second casing being lowered into a well through a first casing already cemented in the well. The fluid c... | 09/23/2003 |
| 6464008 | Well completion method and apparatus An apparatus and method for the completion of wells through a production tube includes a tool body having cement flow ports and pressure displaced port closure elements. A perforated mandrel tube concentrically aligned within the production tube is secure... | 10/15/2002 |
| 6401822 | Float valve assembly for downhole tubulars A check valve assembly for the bottom of a casing string with increased open area is provided. Multiple check valves are provided for assurance of ultimate closure. Bypass flow paths are available during run in that increase the normal available open area... | 06/11/2002 |
| 6354371 | Jet pump assembly A jet pump assembly 10 for use in a subterranean wellbore 82 to lift produced fluids 72 to the surface, comprising a fixed type jet pump assembly 10 including a retrievable insert assembly 30 for retrieving substantially all working components of the jet ... | 03/12/2002 |
| 6311771 | Plug for use in wellbore operations and apparatus for launching said plug An apparatus for launching at least two plugs, said apparatus comprising a mandrel (2), a lower plug (22) and an upper plug (21) releasably disposed with respect to said mandrel (2), wherein said upper plug (21) comprises a body (23) having a flow path (2... | 11/06/2001 |
| 5782303 | Method and apparatus for draining fluids from tubing An apparatus which includes an external housing (10) and a slotted internal sleeve (26) machined from cylindrical lengths of hollow metal pipe stock, and one or more partially-hollowed-out plug screws (16). This apparatus uses no seals or O-rings. The app... | 07/21/1998 |
| 5738171 | Well cementing inflation packer tools and methods The present invention provides an improved cementing inflation packer tool and methods of using the tool. The tool includes of a tubular housing having a packer inflating port disposed therein and a packer inflating port opening sleeve slidably disposed w... | 04/14/1998 |
| 5641021 | Well casing fill apparatus and method Improved well casing fill apparatus and methods for filling a casing string with well bore fluid while running the string into a well bore and then cementing the casing in the well bore are provided. A well casing fill apparatus of this invention is basic... | 06/24/1997 |
| 5499687 | Downhole valve for oil/gas well A downhole drilling device utilizing a spring-loaded sleeve within a casing for controlling circulation of fluid material. A plastic, i.e., deformable ball is used to block a flow opening in the sleeve for positioning the sleeve and aligning flow ports. S... | 03/19/1996 |
| 5437330 | Liner cementing system and method A liner cementing system and method provide for a landing collar 10 with a bypass passageway 45. Circulation port 62 in collar 10 permits initial circulation through the liner 17 until a pump down plug P1 is pumped therein to seal off circulation therethr... | 08/01/1995 |
| 5411095 | Apparatus for cementing a casing string A method and apparatus for cementing a casing string utilizes a port collar which may be hydraulically opened and mechanically closed, and permits the passage of downhole tools through the port collar, without opening the port collar.... | 05/02/1995 |
| 5348089 | Method and apparatus for the multiple stage cementing of a casing string in a well The present invention provides a cementing tool for cementing multiple stages within a well. The assembly includes a housing assembly which defines one or more cementing ports. A first sleeve assembly is retained within the housing and is movable from a f... | 09/20/1994 |
| 5314015 | Stage cementer and inflation packer apparatus A stage cementer and inflation packer apparatus. The apparatus comprises a mandrel with an external closing sleeve and an operating sleeve interlocked therewith. Below the operating sleeve is an opening sleeve. The opening sleeve is mechanically acutated ... | 05/24/1994 |
| 5259451 | Down hole well tool with pressure relief chamber A down hole well tool for use in operating another well tool against the resistance of incompressible well bore fluid. The down hole tool includes a pressure chamber that communicates through an adjustable pressure relief valve with the well bore fluids b... | 11/09/1993 |
| 5209304 | Propulsion apparatus for positioning selected tools in tubular members A propulsion apparatus is provided for attachment to a selected tool for propelling and positioning the tool in a tubular member in response to fluid pressure in the tubular member and includes a tubular mandrel terminating in a lower free end, a tubular ... | 05/11/1993 |
| 5178214 | Restriction sub with deformable plastic sleeve In accordance with an illustrative embodiment of the present invention, a restriction sub apparatus for use during well cementing operations includes a tubular body having an internal annular recess, and a plastic restriction sleeve mounted in the recess,... | 01/12/1993 |
| 5146992 | Pump-through pressure seat for use in a wellbore A seal assembly is provided for use in a fluid flow conduit, and includes a valve seat and a valve plug. The valve seat includes a seating lip formed at least in-part of yieldable material. The valve plug is passed through the fluid flow conduit and cause... | 09/15/1992 |
| 5137087 | Casing cementer with torque-limiting rotating positioning tool A casing cementer with torque-limiting rotating positioning tool. The casing cementer comprises a housing with a rotating valve sleeve therein. A positioning tool is used to rotated the valve sleeve between open and closed positions thereof. No recipricat... | 08/11/1992 |
| 5109925 | Multiple stage inflation packer with secondary opening rupture disc A multiple stage inflation packer with secondary opening rupture disc. The inflatable packer comprises a case with a closing sleeve, an opening sleeve and a releasing sleeve therein. An opening plug is dropped into the casing string and is allowed to free... | 05/05/1992 |
