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| Number | Title | Issue Date |
| 7938189 | Pressure protection for a control chamber of a well tool A technique includes providing a chamber in a well tool to receive pressure to control an operation of the tool. The technique includes providing a seal to isolate the chamber from well pressure. The technique also includes providing a pressure relief mechanism to r... | 05/10/2011 |
| 7798231 | Adapter sleeve for wellhead housing A subsea wellhead assembly for a subsea well including a low pressure wellhead housing having a string of conductor piping extending therefrom. A high pressure wellhead housing, having a string of outer casing suspended therefrom, lands within the low pressure wellh... | 09/21/2010 |
| 7401654 | Blowout preventer testing system A method and apparatus is disclosed for testing a blowout preventer (BOP) by: using a drillpipe to install a test plug into one end of the throughbore of a (BOP); using a valve in the BOP to isolate the opposite end of the throughbore of the BOP, using piping to con... | 07/22/2008 |
| 7360601 | Submersible well pump installation procedure A method of installing an electrical pump assembly in a subsea wellhead member avoids having to run the pump assembly through the wellhead member after removing the wear bushing. The operator first lowers the pump assembly on a string of tubing at least through the ... | 04/22/2008 |
| 7314088 | System for retrieving a tubular element from a well A system is disclosed for retrieving a tubular element extending into a subsea well provided with a wellhead, the tubular element being provided with a hanger suspending the tubular element at the wellhead, the hanger having a larger outer diameter than the tubular ... | 01/01/2008 |
| 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 |
| 7219736 | Externally testable redundant connections for subsea wells An externally testable redundant connection for a subsea well includes a tube, a connector assembly, and collar. The connector assembly includes a jam nut over the tube; a ferrule over the tube adjacent the jam nut; and a double jam nut disposed over the tube adjace... | 05/22/2007 |
| 7159669 | Internal riser rotating control head A holding member provides for releasably positioning a rotating control head assembly in a subsea housing. The holding member engages an internal formation in the subsea housing to resist movement of the rotating control head assembly relative to the subsea housing.... | 01/09/2007 |
| 7096937 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore comprises a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore. A tubing hanger is supported in the... | 08/29/2006 |
| 7093660 | 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... | 08/22/2006 |
| 7073591 | Casing hanger annulus monitoring system A subsea wellhead assembly has the capabilities of communicating from a tree assembly mounted on an inner wellhead housing to a casing annulus. A passage in the wellhead assembly extends within the bore of the wellhead housing from the casing annulus to the tree ass... | 07/11/2006 |
| 7069988 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore; a tubi... | 07/04/2006 |
| 7044227 | Subsea well injection and monitoring system A subsea wellhead assembly has the capabilities of communicating from the outer surface of an inner wellhead housing to a casing annulus. A connector, adapted to attach to a riser, connects to the outer surface of the inner wellhead housing, thereby communicating wi... | 05/16/2006 |
| 7032673 | Orientation system for a subsea well An outer wellhead housing has an external locator member initially oriented in a desired direction. An inner wellhead housing lands in the outer wellhead housing. A BOP orientation spool with an external orientation member and an internal orientation member lands on... | 04/25/2006 |
| 7021385 | Method and apparatus for controlling well pressure in open-ended casing A system and method for preventing blowouts during the deployment of a casing string into a wellbore. The system includes securing a casing coupling to a casing string and securing a retrievable check valve within the casing coupling. The retrievable check valve all... | 04/04/2006 |
| 6978839 | Internal connection of tree to wellhead housing A subsea wellhead assembly has a tree that connects internally to the bore of wellhead housing. The tree has a lower end that has a lock member that is moved radially outward into engagement with a profile in the bore of the wellhead housing. The tree is a monobore,... | 12/27/2005 |
| 6966381 | Drill-through spool body sleeve assembly A drill-through spool body sleeve assembly comprises a test sleeve removably installed within a drill-through spool body having a bore with the terminal ends of the outer diameter of the test sleeve sealingly engaging the bore wall. The sleeve assembly also comprise... | 11/22/2005 |
| 6915847 | Testing a junction of plural bores in a well A test technique and mechanism includes lowering a junction assembly to a junction between at least two bores of a well. The junction assembly includes one or more sealed connections that are tested by the generation of a test flow of fluid. The distal ends of the j... | 07/12/2005 |
| 6913083 | Method and apparatus to monitor, control and log subsea oil and gas wells A method and apparatus for logging, controlling, or monitoring a subsea well or group of wells through a path not within production tubing. Preferred embodiments allow logging tools, wire rope, optic fibers, electrical cables, monitoring and measuring instruments an... | 07/05/2005 |
| 6823950 | Method for formation pressure control while drilling A method for addressing the problem known as formation breathing occurring during the drilling of a subsea well in an earth formation in performing a series of leak off tests to determine the earth formation fracture propagation pressure and the earth formation frac... | 11/30/2004 |
| 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 |
| 6772843 | Sea-floor pressure head assembly A method for eliminating the presence of micro-annuluses associated with a subsea hydrocarbon producing wellbore for accurate gathering of data within the subsea hydrocarbon producing wellbore. The method involves using a sea floor pressure head assembly in conjunct... | 08/10/2004 |
| 6715555 | Subsea well production system A tubing hanger positioned within the bore of a wellhead body has a vertical bore from which a tubing string may be suspended within a well bore. When the hanger is landed, a fluid passageway in the tubing hanger has one end in fluid communication with a passageway ... | 04/06/2004 |
| 6705401 | Ported subsea wellhead A susbsea well has communication passages to enable annulus pressure surrounding inner and intermediate strings of casings to be monitored at the surface. The passages both have outlets that allow communication to the tree assembly for monitoring. In one embodiment,... | 03/16/2004 |
| 6513596 | Non-intrusive pressure measurement device for subsea well casing annuli A well data monitoring system which enables annulus pressure and other well parameters to be monitored in the outer annuli of the well casing program without adding any pressure containing penetrations to the well system. This non-intrusive approach to mo... | 02/04/2003 |
| 6499540 | Method for detecting a leak in a drill string valve A method for detecting a leak in a drill string valve used when drilling a subsea well. The method comprises measuring a first inlet pressure at a subsea mudlift pump while a subsea mudlift pump and a surface pump are operating and before a well is fully ... | 12/31/2002 |
| 6435775 | Buoyancy system with buoyancy module seal A buoyancy system for a deep water floating platform includes at least one buoyancy module coupled to the a riser. The module may be coupled to a ring structure of an end cap coupled to the riser, or two modules may be coupled to a ring structure to coupl... | 08/20/2002 |
| 6390194 | Method and apparatus for multi-diameter testing of blowout preventer assemblies A method and apparatus for testing blowout preventer systems that enables testing of various size pipe rams, as well as safe and efficient shut-in of a well, without having to trip the entire apparatus out of a well. The testing apparatus generally includ... | 05/21/2002 |
| 6340057 | Connection device The present invention refers to a connection device (14, 15), particularly for the connection of a rigid duct to a flexible duct in a submarine system for petroleum exploration, comprising a base (16); a hub fixed on the base; a hoisting/launching device,... | 01/22/2002 |
| 6237689 | Method for confirming the integrity of a seal system within a subterranean well conduit Christmas tree valve assembly Method and apparatus are disclosed for confirming the integrity of a seal system extending between a conduit disposed within a subterranean well and a surface or top Christmas tree assembly such that the confirmation steps do not adversely thereafter effe... | 05/29/2001 |
| 6186237 | Annulus check valve with tubing plug back-up A subsea well has a tubing hanger which has an annulus bore and a production bore. A check valve is located in the annulus bore. A running tool runs the tubing hanger on a monobore riser such as a drill string while holding the check valve in the open pos... | 02/13/2001 |
| 6177483 | Setting composition for well operations A composition and uses of said composition are described for a latex based setting system for remedial and other operations within a wit bore. The composition comprises a pH-reducing agent and/or a coagulant. By controlling the amount of agent, the settin... | 01/23/2001 |
| 6152230 | High pressure tree cap A wellhead cap assembly (10) includes a high security barrier (16) for installation onto a wellhead (12) containing any leakage safely and for permitting the installation of a subsea xmas tree onto the wellhead (12) whilst, simultaneously, providing means... | 11/28/2000 |
| 6152225 | Method and apparatus for multi-diameter testing of blowout preventer assemblies A method and apparatus for testing blowout preventer systems that enables testing of various size pipe rams, as well as safe and efficient shut-in of a well, without having to trip the entire apparatus out of a well. The testing apparatus generally includ... | 11/28/2000 |
| 6032736 | Multi-gage blowout preventer test tool and method A multi-gage blowout preventer test tool for testing different size ram and annular BOP's in one trip has an outer test tube assembly and an inner tube assembly connected in telescoping relation. The exterior of the outer tube has a plurality of pipe gage... | 03/07/2000 |
| 5660234 | Shallow flow wellhead system A subsea wellhead system is used in areas which have shallow water producing sands. A first string of casing extends from the sea floor through a section of conductor pipe and below the conductor pipe to a point above the water sand. An external wellhead ... | 08/26/1997 |
| 5396956 | Well head isolation tool sealing nipple testing apparatus and method of pressure testing isolation tool sealing nipple seals when in position on a well A wellhead isolation tool nipple seal testing apparatus includes an upper seal, upper nipple, and a lower seal and a lower nipple, the lower nipple being attached to the upper nipple. Test pressure forced between the upper and lower seals may be used to t... | 03/14/1995 |
| 5172112 | Subsea well pressure monitor A pressure measuring device will measure pressure in a subsea tubular member. The device includes a stationary unit mounted to the exterior of the tubular member and a movable unit that will be lowered into position next to the stationary unit whenever pr... | 12/15/1992 |
| 5163029 | Method for detection of influx gas into a marine riser of an oil or gas rig In accordance with the present invention, several methods are presented for the detection of gas into an offshore marine riser (e.g., riser gas). In a first embodiment of this invention, an acoustic transmitter is positioned on or nearby the subsea blowou... | 11/10/1992 |
| 5063772 | Method for troubleshooting gas-lift wells A method is provided for troubleshooting gas-lift wells, to identify whether gas-lift valves on the production tubing are open or closed, without the use of wireline tools. The method may also be used to detect leaks in the production tubing or in the wel... | 11/12/1991 |
