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| Number | Title | Issue Date |
| 7377311 | Wellhead valves A safety valve system for removing down-hole tools from a coal-bed methane well. The system includes first and second horizontally opposed stuffer-blocks, a stuffer-box housing for housing the stuffer-blocks, a means for attaching said stuffer-box housing to a coal-... | 05/27/2008 |
| 7363969 | Casing vent security device A casing vent security device includes an in-line section in communication with a casing vent, the in-line section having an ambient air passageway for selectively allowing ambient air to pass through the in-line section and into the vent. The device further include... | 04/29/2008 |
| 7350580 | Subsea pass thru switching system A coupling switches control fluid from a tubing hanger to a downhole completion of a subsea well. The coupling, located between a tubing hanging running tool and a downhole completion, includes a coupling body and a tubing hanger. A hydraulic poppet switches control... | 04/01/2008 |
| 7331396 | Subsea production systems A subsea production system is disclosed. The subsea production system may comprise a well head, a tubing spool, a tubing hanger, an annulus, a production tree, and a bypass flow path. ... | 02/19/2008 |
| 7325598 | Vacuum assisted seal engagement for ROV deployed equipment A method and apparatus for attaching a first component which comprises a depending portion to a second component which comprises a bore that is sized and configured to receive the depending portion, wherein the first and second components are exposed to a fluid whic... | 02/05/2008 |
| 7322407 | Wellhead isolation tool and method of fracturing a well A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end ... | 01/29/2008 |
| 7308943 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 12/18/2007 |
| 7111687 | Recovery of production fluids from an oil or gas well A method and assembly for recovering fluids from, or injecting fluids into, a well having a christmas tree; the fluids typically flow between first and second flowpaths in a continuous path. The assembly may be located within the main bore, or a side passage of the ... | 09/26/2006 |
| 7059418 | Pressurized seal arrangement A pressurized sealing arrangement suited for providing a seal between a valve stem and a valve body is provided. The sealing arrangement includes a piston that is restrained in and statically sealed to the valve body and which surrounds the valve stem. Contained wit... | 06/13/2006 |
| 7055632 | Well stimulation tool and method for inserting a backpressure plug through a mandrel of the tool A well stimulation tool includes a well stimulation tool mandrel with an axial bore having an internal diameter large enough to permit a backpressure plug to be run through the mandrel into a tubing mandrel, such as a tubing hanger or a casing mandrel, to which the ... | 06/06/2006 |
| 7055611 | Plug-dropping container for releasing a plug into a wellbore A plug-dropping container used for releasing plugs or other objects into a wellbore during fluid circulation procedures. In one aspect, the plug-dropping container is used as part of a cementing head. The plug-dropping container comprises an elongated housing, and a... | 06/06/2006 |
| 7051804 | Subsea protective cap A cap for covering an open upper end of a subsea structure includes a base and a body. The base has a size, after shrinkage, at least slightly larger than the exterior of the open upper end of the subsea structure. The body is connected to the base and projects down... | 05/30/2006 |
| 6966383 | Horizontal spool tree with improved porting The horizontal spool tree assembly 10 controls fluid flow through a production tubing string 18 within a well. The horizontal spool tree assembly is adapted for use with a workover string for fluid communication with the tree assembly. The spool body | 11/22/2005 |
| 6962205 | Subsea wellhead landing clamp and slip bowl assembly A clamp for supporting a subsea wellhead and attached casing string preparatory to installing same in a well, and slip bowl assembly for running a drill pipe cementing string inside the casing string. The clamp comprises two hinged together clamp halves with a conne... | 11/08/2005 |
| 6953084 | Actuator for well-head valve or other similar applications and system incorporating same An electrical actuator is particularly suited for driving a wellhead valve for regulating the flow of natural gas from a production well. The electrical actuator can be driven using the existing local power supply in wellhead valve systems, typically a solar panel a... | 10/11/2005 |
| 6938696 | Backpressure adapter pin and methods of use A tubing assembly including a tubing string and tubing hanger provides a fluid passage with backpressure threads for securing a backpressure plug in a fluid-tight seal below the tubing hanger, so that the tubing hanger can be removed from the tubing string. The back... | 09/06/2005 |
| 6926084 | Apparatus for transferring hydrocarbons from a subsea source to a vessel An apparatus for transferring hydrocarbons from a subsea source to a vessel, wherein the risers are suspended from a rotating body and communicate with a swivel unit including a number of swivel rings having outlets connected to a pipe system on the vessel. The appa... | 08/09/2005 |
| 6918439 | Backpressure adaptor pin and methods of use A tubing assembly including a tubing string and tubing hanger provides a fluid passage with backpressure threads for securing a backpressure plug in a fluid-tight seal below the tubing hanger, so that the tubing hanger can be removed from the tubing string. The back... | 07/19/2005 |
| 6817423 | Wall stimulation tool and method of using same An apparatus for protecting equipment in a wellhead from exposure to fluid pressures, abrasives and corrosive fluids used in a well treatment to stimulate production, includes a mandrel to be inserted through the wellhead into an operative position. The apparatus fu... | 11/16/2004 |
| 6776230 | Coiled tubing line deployment system A horizontal Christmas tree is adapted for ESP/HSP or downhole sensor deployment by a coiled tubing hanger 38 received in the tubing hanger 12. Coiled tubing 40 suspends downhole equipment such as ESP 60, and carries power/signal lines. T... | 08/17/2004 |
| 6769489 | Well stimulation tool and method of using same A well stimulation tool is connected to a top of a tubing hanger in a well to be stimulated. The well stimulation tool includes an adapter pin that connects to the tubing hanger. The adapter pin is connected to a mandrel that reciprocates through a top end of an ada... | 08/03/2004 |
| 6719057 | Downhole subsurface safety valve device A downhole subsurface safety valve device, where an actuator is mounted on the outside of the well on the Christmas tree and the valve is operated by a mechanical transmission which may be linear (an hydraulic actuator) or rotary (an electric motor). ... | 04/13/2004 |
| 6695049 | Valve assembly for hydrocarbon wells A valve assembly for hydrocarbon wells comprises a first valve (e.g., a conventional gate valve) and a second valve (e.g., a hydraulically operated, fail safe check valve). The second valve provides an alternative to the pressure barrier conventionally fo... | 02/24/2004 |
| 6675900 | Crossover tree system A subterranean oil or gas well apparatus is provided. The apparatus includes a single-bore production tubing hanger arranged concentric with a wellhead. The tubing hanger includes a plurality of ports and channels arranged about the tubing hanger to give ... | 01/13/2004 |
| 6637514 | Recovery of production fluids from an oil or gas well A method and assembly for recovering production fluids from a well having a tree, using a conduit which is inserted into a production bore to divert the recovered fluids via chemical treatment, pumping or any other apparatus with minimal reduction in the ... | 10/28/2003 |
| 6626239 | Internal gate valve for flow completion systems A gate valve for a component which includes an elongated body and a flow passage extending generally longitudinally through the body, the flow passage including a generally lateral first branch connected to a generally longitudinal second branch. The gate... | 09/30/2003 |
| 6615923 | ROV-deployable subsea wellhead protector A protector for placement over subsea wellheads. A main body is cylindrical, with an inner diameter of sufficiant size to fit over a subsea wellhead. One end of the main body has a cap across it. A vent and a pump-through port, which permits pumping in of... | 09/09/2003 |
| 6612368 | Flow completion apparatus A flow completion apparatus comprises a wellhead housing installed at an upper end of a well bore and a tubing spool connected over the wellhead housing. The tubing spool includes a central bore extending axially therethrough, a production outlet communic... | 09/02/2003 |
| 6561269 | Canister, sealing method and composition for sealing a borehole Canister, sealing method and composition for sealing a borehole. The canister includes a container with slurry inside the container, one or more slurry exits at one end of the container, a pump at the other end of the container, and a piston inside that p... | 05/13/2003 |
| 6497277 | Internal gate valve for flow completion systems A gate valve for a component which includes an elongated body and a flow passage extending generally longitudinally through the body, the flow passage including a generally lateral first branch connected to a generally longitudinal second branch. The gate... | 12/24/2002 |
| 6488094 | Method and apparatus for shutting off upward flow from a conduit An apparatus for handling safety valves used for shutting off high pressure upward flow through drill pipe or tubing. The apparatus includes an adjustable clamp assembly for holding the safety valve; a three-stage double-acting hydraulic extension system ... | 12/03/2002 |
| 6474418 | Wellbore fluid recovery system and method A wellbore fluid recovery system and method is disclosed for recovering a column of wellbore fluid within a stand of pipe when breaking out joints of a wellbore tubular string. The system comprises a container that can be mounted to seal around the joint.... | 11/05/2002 |
| 6276451 | Pressure relief system for live well snubbing A pressure relief system for use in live well snubbing has blow-out preventers (BOPs) mounted one above the other in a BOP stack on a live well bore and spools installed between successive ones of the blow-out preventers, the spools and the blow-out preve... | 08/21/2001 |
| 6276386 | Charging device for hydraulic systems There is described herein an apparatus for charging a fluid line through a coupler such as a penetrator. The apparatus comprises a body formed from a sidewall defining a bore positioned along the longitudinal axis and extending therethrough. The first end... | 08/21/2001 |
| 6189620 | Method and apparatus for shutting off upward flow from a conduit An apparatus for handling safety valves used for shutting off high pressure upward flow through drill pipe or tubing. The apparatus includes an adjustable clamp assembly for holding the safety valve; a three-stage double-acting hydraulic extension system ... | 02/20/2001 |
| 6186239 | Casing annulus remediation system A casing annulus remediation system for lowering a flexible hose into an annulus between strings of casing in a petroleum well by pressurizing the hose so that the hose is rigid and may be forced down the annulus. It is necessary to insert the hose throug... | 02/13/2001 |
| 6176466 | Composite pumping tree with integral shut-off valve A unitary pumping tree is provided for forming part of a wellhead assembly christmas tree. The tree integrates a bottom connector, shut-off valve, hydraulically actuated blow-out preventer, mechanically actuated blow-out preventer, flow tee and top connec... | 01/23/2001 |
| 6125928 | System for controlling and stopping oil drilling fires System for controlling oil well fires by blocking the production or drilling pipes. A box incorporating a movable piston is fitted around the pipe. The piston carries, on its forward end, a drilling cylinder (3), which can be brought to the pipe by a hydr... | 10/03/2000 |
| 6109352 | Simplified Xmas tree using sub-sea test tree An improved sub-sea Xmas tree consists of a wellhead connector, a cylindrical structural housing and a tree cap mounted on top of the housing. A dual bore sub-sea completion test tree is disposed in the housing and it has a main production bore with seria... | 08/29/2000 |
| 6039122 | Methods and apparatus for automatically lauching sticks of various materials into oil and gas wells An apparatus, and related methods, for automatically releasing sticks of various materials into oil and gas wells. The apparatus has an enclosed magazine which has several chambers for the sticks. The magazine rotates on a shaft when a sprocket on the sha... | 03/21/2000 |
