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| Number | Title | Issue Date |
| 7240727 | Armored stripper rubber An armored stripper rubber is provided that protects the drillstring bore of the stripper rubber from substrate infiltration, yet pivotally dilates to facilitate the passage of drillstring components through the bore while effectively maintaining a fluid-tight seal.... | 07/10/2007 |
| 7021633 | Low friction fluid seal device with additive to rubber compound A fluid seal device for use in sealing an annular space between an internal surface of a cylinder and a member therein having an outer cylindrical surface and being formed at least in part from rubber. An oleamide additive is included in the rubber compound comprisi... | 04/04/2006 |
| 7007913 | Rotating blowout preventer with independent cooling circuits and thrust bearing A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent from the se... | 03/07/2006 |
| 7004444 | Rotating blowout preventer with independent cooling circuits and thrust bearing A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent from the se... | 02/28/2006 |
| 7000888 | Pump rod clamp and blowout preventer A pump rod clamp for gripping a pump rod in an oil, gas or water well. The pump rod clamp comprises a central housing having a longitudinal bore for receiving a pump rod, a plurality of clamping members receivable within the central housing, and one or more actuator... | 02/21/2006 |
| 6974135 | Variable bore ram A ram type blowout preventer includes variable ram packers for sealing about tubulars of different outside diameters in the bore of the preventer housing or about a single tubular having a variable outside diameter. Each ram packer includes a body of elastomeric mat... | 12/13/2005 |
| 6966373 | Inflatable sealing assembly and method for sealing off an inside of a flow carrier An inflatable sealing assembly integrated with a flow carrier which seals the inside of the flow carrier upon detection of a physical condition (e.g. fluid pressure). The inflatable sealing assembly includes a housing, a compartment in the interior of the housing fo... | 11/22/2005 |
| 6955357 | Extended range variable bore ram packer for a ram type blowout preventer A variable bore ram packer including a ram body, a top seal and a packer member designed for use in a standard ram-type blowout preventer used in oil and gas drilling operations is disclosed. The packer member is molded of an elastomeric material having a central se... | 10/18/2005 |
| 6910531 | Rotating drilling stripper A stripper assembly for sealing around a drill pipe includes an outer housing having a lateral outlet. The outer housing is mounted at an upper end of a well for receiving an upward flow of drilling fluid and diverting the drilling fluid through the lateral outlet. ... | 06/28/2005 |
| 6896076 | Rotating drilling head gripper A rotating drilling head seals around drill pipe while drilling. The drilling head has an outer housing that mounts to the rig floor. An inner housing is rotatably mounted in the outer housing. An annular bladder is mounted in the inner housing. An annular elastomer... | 05/24/2005 |
| 6857634 | BOP assembly with metal inserts A blowout preventer assembly 10 includes opposed rams 12, 14, each including a rubber or elastomer sealing assembly 16, 18, with a plurality of inserts 20 forming an array 22 of metal inserts within each sealing assembly. Each inse... | 02/22/2005 |
| 6749172 | Rotating blowout preventer with independent cooling circuits and thrust bearing A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent from the se... | 06/15/2004 |
| 6554016 | Rotating blowout preventer with independent cooling circuits and thrust bearing A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent ... | 04/29/2003 |
| 6367804 | Variable bore ram packer for tapered tubular members in a ram type blowout preventer A variable bore ram packer designed for use in a standard ram-type blowout preventer used in oil and gas drilling operations is disclosed. The variable bore ram packer is molded of an elastomeric material having a central semi-circular opening sized to fi... | 04/09/2002 |
| 6244359 | Subsea diverter and rotating drilling head A drilling head used to seal around a drill pipe while drilling is employed in a subsea location. The drilling head has an inner body located within an outer body. At least one bearing is located between the outer body and the inner body for facilitating ... | 06/12/2001 |
| 5931443 | Method of rebuilding annular-type blow out preventer A method of rebuilding an annular blow out preventer of the type having a head with threads that attach it to the body of the blow out preventer involves the removal of about 1 to 11/2) of the threads (e.g., if total thread revolutions equal seven (7) rev... | 08/03/1999 |
| 5863022 | Stripper/packer and blowout preventer with split bonnet A stripper/packer which also serves as a blowout preventer includes a split bonnet. The split bonnet comprises a pair of opposed bonnet halves that may be hydraulically actuated into contact with each other and locked in place to form a bonnet over a pack... | 01/26/1999 |
| 5851013 | Blowout preventer packing element with metallic inserts A packing element for an annular blowout preventer includes an annular elastomeric body disposed about a longitudinal axis that is adapted to be compressively displaced inwardly towards the axis. A plurality of the metallic inserts are embedded in the bod... | 12/22/1998 |
| 5713581 | Fibrous seal for blowout preventer A high pressure seal material, such as for a lateral "T" seal of a shear ram blowout preventer, is disclosed wherein the seal material is preferably nitrile rubber and includes uniformly dispersed synthetic, non-cellulosic fibers in parallel alignment to ... | 02/03/1998 |
| 5507465 | Blow-out preventer A blow out preventer is described including a housing with a first annular wedge member fixed to an interior sidewall of the housing. A second annular wedge assembly is provided which includes a plurality of wedge segments disposed within an interior of t... | 04/16/1996 |
| 5251869 | Rotary blowout preventer A rotary blowout preventer is provided having a resilient sealing body which is deformed about a drill string or sealing by means of a tapered actuator cone. The actuator cone is driven by a piston which is responsive to annulus pressure and which is also... | 10/12/1993 |
| 5167283 | Combination ball valve and annular pipe seal A diverter for a riser string between subsea well and offshore drilling rig utilizes a rotatable ball element. The ball element mounts in a tubular housing. The ball element has a passage through it which is coaxial with the riser when the ball element is... | 12/01/1992 |
| 5116017 | Annular sealing element with self-pivoting inserts for blowout preventers An improved annular sealing element for oil well blowout preventers includes a plurality of curved metal segments spaced apart at regular circumferential angles and imbedded in a resilient matrix forming a generally lenticular-shaped body with a hollow ce... | 05/26/1992 |
| 4969390 | Rod locking device A new and improved ram locking apparatus for blowout preventer rams which allows the rams to be locked in the closed position and compensates for wear on the sealing elements of the rams. The device consists of a tubular cross containing a rod extension w... | 11/13/1990 |
| 4949785 | Force-limiting/wear compensating annular sealing element for blowout preventers An improved annular sealing element for oil well blowout preventers includes a plurality of curved metal segments spaced apart at regular circumferential angles and imbedded in a resilient matrix forming a generally lenticular-shaped body with a hollow ce... | 08/21/1990 |
| 4930745 | Variable bore ram rubber An improved sealing element for variable bore ram blowout preventers of the type using two semicircular ram blocks to urge a resilient sealing member into sealing circumferential contact with the circumferential surface of a tubular drill string component... | 06/05/1990 |
| 4905958 | Blowout preventer A blowout preventer, particularly for use in drilling bore hole sections near the sea bed, is adapted to prevent blowout of shallow gas in the bore hole. It comprises at least one annular, preferably flexibly expansible and contractible packing element (5... | 03/06/1990 |
| 4858882 | Blowout preventer with radial force limiter An oil well blowout preventer has a housing with axially aligned entrance and exit pipe casing bores and a coaxially aligned hemispherical cavity in the upper portion of the housing. A ring-shaped, convex upper surface sealing member fits conformally with... | 08/22/1989 |
| 4783084 | Head for a rotating blowout preventor A rotating blowout preventor is comprised of a rotating head assembly which is removably received at the upper end of a main housing. The rotating parts of the head assembly are held fastened together by the provision of a unique locking plate arrangement... | 11/08/1988 |
| 4718495 | Surface packer and method for using the same Surface packer and method for using the same. An annular body is mounted on the upper end of a string of casing which extends above a drilling rig platform. An annular seal is received within the body at the upper end thereof and may be sealed against the... | 01/12/1988 |
| 4614148 | Control valve system for blowout preventers A control valve system and method are disclosed for blowout preventers having an actuating piston for actuating the closing of the blowout preventer whereby the piston has an opening side and a closing side. The control valve system and method include a m... | 09/30/1986 |
| 4605195 | Annular blowout preventer packing unit An annular blowout preventer packer unit is disclosed having an annulus of elastomeric material in which is embedded metallic drive inserts provided in an outward circle about the axis. Metallic lead inserts are provided in an inward circle about the axis... | 08/12/1986 |
| 4602794 | Annular blowout preventer with upper and lower spherical sealing surfaces and rigid translation element An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in ... | 07/29/1986 |
| 4579314 | Annular blowout preventer An annular blowout preventer having a body with a central bore therethrough and a packer recess surrounding and opening on said recess, an annular packer which is a complete ring or a split ring in said recess, means for actuating said packer to closed po... | 04/01/1986 |
| 4566494 | Vent line system A vent line system is disclosed which is adapted for connection to a flow diverter attached to a drilling rig. The system assures that the vent line is always open for discharge of pressurized drilling fluid away from the drilling rig in one of two direct... | 01/28/1986 |
| 4529210 | Drilling media injection for rotating blowout preventors Improvements in the operation of a rotating blowout preventor. The rotating head assembly of a rotating blowout preventor includes a stripper rubber which has an upper annular member attached to the lower annular end of a metal support member. The support... | 07/16/1985 |
| 4522368 | Closure device A closure device connectible to a well head through which the polished rod of a rod string extends into a well tubing for operating pump means for moving well fluids to a surface flow conductor, the closure device having a tubular ram provided with a pack... | 06/11/1985 |
| 4509405 | Control valve system for blowout preventers A control valve system and method are disclosed for blowout preventers having an actuating piston for actuating the closing of the blowout preventer whereby the piston has an opening side and a closing side. The control valve system and method include a m... | 04/09/1985 |
| 4508311 | Annular blowout preventer An improved annular blowout preventer having a body with a central bore, an annular packer chamber facing the bore, an improved annular packer in said chamber and means for axially loading said annular packer to actuate it to closed position, said improve... | 04/02/1985 |
| 4502534 | Flow diverter Apparatus adapted for connection to a drilling conduit beneath a drilling rig floor for diverting pressurized well bore fluid in the conduit from the rig and sealing the annulus between a pipe or other object and the conduit or closing the vertical flow p... | 03/05/1985 |
