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| Number | Title | Issue Date |
| 7527104 | Selectively activated float equipment A valve for a well pipe, the valve having the following parts: a valve collar connectable to the well pipe; an index piston coaxially positioned within the valve collar for longitudinal translation within the valve collar between closed, flow-open, and locked-open c... | 05/05/2009 |
| 7367358 | Medical fluid delivery system and method relating to the same A medical fluid delivery system for the use in the delivery of medical fluids. The medical fluid delivery system may include a pumping system, a disposable medical fluid line set and a valve operating system. The disposable tubing line set may include valves adapted... | 05/06/2008 |
| 7350598 | Downhole tool A downhole tool for use within a well comprising a body having an external diameter smaller than the diameter of the well so as to form an annular gap between the body and the interior surface of the well. A first downhole fluid passage having an upper inlet and a l... | 04/01/2008 |
| 7337847 | Multi-cycle downhole apparatus A downhole apparatus which can be used as multi-cycle circulating subs utilized in downhole drilling operations, includes a piston (242) slidably mounted in a body between positions in which at least one aperture in the body is opened and closed. Movement of ... | 03/04/2008 |
| 7168492 | Wellbore annulus flushing valve The invention relates to downhole wellbore apparatus and particularly, but not exclusively, to apparatus for use in wellbore cleaning operations. A downhole tool (2) comprises a body (4) having a bore extending longitudinally therethrough, wherein the ... | 01/30/2007 |
| 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 |
| 6889771 | Selective direct and reverse circulation check valve mechanism for coiled tubing A method and apparatus for selectively actuating a dual check valve assembly within a well for a direct circulating operational mode or a reverse circulating operational mode. A tubular housing which may be connected to well tubing is provided with a check valve ass... | 05/10/2005 |
| 6830107 | Fluid flow switching device A fluid flow switching device for a drill string comprises a tubular member having a port (4). A sleeve member is slidable within the tubular member between a first position in which a port (3) thereof is in alignment with the port (4) and a sec... | 12/14/2004 |
| 6662877 | Formation isolation valve An assembly that is usable in a subterranean well includes a valve, a sleeve and an index mechanism. The valve is adapted to selectively isolate a region of the well, and the sleeve is adapted to be moved by a downhole tool to cause the valve to transitio... | 12/16/2003 |
| 6595296 | Hydraulic control assembly Hydraulic control assemblies for controlling the operation of one or more downhole tools. In one embodiment of the invention, a hydraulic control assembly (10) includes a tubular member in the form of tubing (12), which carries axial chambers (14), each c... | 07/22/2003 |
| 6516886 | Well isolation system A formation isolation valve assembly for use in a well includes first and second fluid paths that are coupled to at least first and second completion zones. A first valve controls fluid flow from the first zone to the first fluid path, and a second valve ... | 02/11/2003 |
| 6308783 | Wellbore flow control device A device for regulating fluid flow in a well is provided. The device may include: a body member having a central bore extending therethrough, at least one flow port, and a first valve seat; a sleeve member movably disposed within the central bore of the b... | 10/30/2001 |
| 6279657 | Apparatus and method for circulating fluid in a well bore A circulating tool for circulating fluid in a borehole comprising a tubular assembly having an axial through passage between an inlet and a first outlet, a second outlet extending generally transversely of the tubular assembly, and an obturating member mo... | 08/28/2001 |
| 6230807 | Valve operating mechanism Apparatus and method for operating a valve positioned in a wellbore. The apparatus includes a tubing having a bore and a piston operably coupled to the valve. The piston is moveable from a first position to the second position by predetermined pressure ap... | 05/15/2001 |
| 6102060 | Detachable locking device for a control valve and method A valve device for use downhole is described as comprising a body member and a channel through the body member through which fluid can flow. A moveable member is mounted within the body member, and comprises an obturating member for selectively obturating... | 08/15/2000 |
| 6095249 | Down hole bypass valve The invention relates to bypass valves for use in wellbores, particularly but not exclusively to bypass valves used during the setting of hydraulic anchor packers. The invention provides a bypass valve for selectively isolating the interior of a down-hole... | 08/01/2000 |
| 6082459 | Drill string diverter apparatus and method The present invention relates to a drill string diverter apparatus for reducing surge pressure when lowering a liner into a partially cased wellbore. The diverter apparatus is connected in a pipe string above a liner being lowered into a wellbore. The div... | 07/04/2000 |
| 6009942 | Wye block having a rotary guide incorporated therein A wye block apparatus provides selective physical access to multiple downhole tubing strings while permitting fluid communication with each of them. In a described embodiment, a wye block apparatus is resistant to malfunction due to debris therein, in sub... | 01/04/2000 |
| 5901796 | Circulating sub apparatus There is provided a circulating sub apparatus (50) having a tubular outer body member (51, 53, 54, 55, 56, 57) and a tubular inner body member (52, 65). The outer body member (51, 53, 54, 55, 56, 57) and the inner body member (52, 65) each have one or mor... | 05/11/1999 |
| 5529126 | Valve control apparatus After the drilling of an oil well bore there is normally carried out testing using a test tool string. Following completion of the test, the test tools must be shut down, and the test string removed. It is an advantage if the string incorporate some means... | 06/25/1996 |
| 5396953 | Positive circulating valve with retrievable standing valve A positive circulating valve with a retrievable standing valve therein. The valve is used with a packer positioned therebelow. The circulating valve comprises a housing with a mandrel slidably disposed therebetween. A J-slot controls movement between open... | 03/14/1995 |
| 5372197 | Tubing unloader apparatus and method A tubing unloader for draining liquid from production tubing in an oil well. The tubing unloader has a hollow throughbore so as to form a part of the production tubing until it is necessary to drain the production tubing. The tubing unloader has two basic... | 12/13/1994 |
| 5311939 | Multiple use well packer A well packer for engaging and sealing against the inside of a conduit having a mandrel, friction blocks, slips, and a packer seal. The friction blocks are supported by the mandrel and positioned parallel to the slips providing a short inexpensive packer.... | 05/17/1994 |
| 5287930 | Valve apparatus for use in sand control In accordance with an illustrative embodiment of the present invention, a circulating valve for use in sand control and related well operations includes a mandrel that can be rotated in a housing after a weight-responsive clutch is released. As the mandre... | 02/22/1994 |
| 5129459 | Subsea flowline selector A flowline selector device has a housing with a single passage at the upper end and two or more passages at the lower end. A tube connects to the upper end and has a lower end that is offset from the axis of the housing. Reciprocating the tube up and down... | 07/14/1992 |
| 5117912 | Method of positioning tubing within a horizontal well A method of selectively and variably positioning tubing within the generally horizontal section of a horizontally drilled well. A tubing string having a guide shoe secured to the end thereof is inserted into a portion of the horizontal section of a horizo... | 06/02/1992 |
| 5029643 | Drill pipe bridge plug A retrievable bridge plug apparatus, and associated methods, are provided for sealing the bore of a drill pipe string to control a well that is flowing out of control.... | 07/09/1991 |
| 4979568 | Annulus fluid pressure operated testing valve A method and apparatus for operating a ball valve in a test tool string for a subterranean well, including a tubular actuator for the ball valve which is movable from a closing position of the ball valve to an opening position and beyond the opening posit... | 12/25/1990 |
| 4979566 | Washout mechanism for offshore wells A running tool for installing a casing hanger in a subsea conductor also serves to wash cement from the annulus surrounding the casing hanger. The running tool includes a tubular tool body which connects to a string of conduit. An internal sleeve mounts i... | 12/25/1990 |
| 4909326 | Tubing unloader A tubing unloader including first and second housing sections adapted to be telescopingly mounted in each other and movable between open and closed positions by means of a J-slot assembly wherein an actuator pin for the J-slot includes an actuator portion... | 03/20/1990 |
| 4802359 | Tool for measuring pressure in an oil well The invention relates to a tool for measuring pressure in the annular space lying between casing and the production string of an oil well. The tool comprises two sliding elements, with the first element being temporarily locked in a section of the string ... | 02/07/1989 |
| 4793417 | Apparatus and methods for cleaning well perforations A system for cleaning perforations in a well bore by surging formation fluid through the perforations. A wireline retrievable well tool is installed in the well bore above the perforations to establish a fluid barrier which will divide the well bore into ... | 12/27/1988 |
| 4782897 | Multiple indexing J-slot for model E SRO valve The present invention comprises a novel, improved connector mechanism for connecting a probe and a pipe string portion of a wireline based data transmission system. The connector mechanism includes cooperating pin and channel means, one of said means asso... | 11/08/1988 |
| 4657082 | Circulation valve and method for operating the same Pressure operated circulation valve and method for using the same. A cylindrical housing has an open longitudinal passageway therethrough and a circulation port disposed through a wall thereof. A valve mandrel is slidably received in the housing and is mo... | 04/14/1987 |
| 4646838 | Low pressure responsive tester valve with spring retaining means An annulus pressure responsive tester valve has a housing with a flow passage disposed therethrough. A full opening ball valve is disposed in the housing. A differential pressure responsive power piston is slidably disposed in the housing and operatively ... | 03/03/1987 |
| 4590998 | Tubing valve Disclosed is a tubing valve which may be used for selectively closing passages through tubular members and the like. The valve includes first and second housing members which may be mutually moved and which carry a latch assembly for limiting such movemen... | 05/27/1986 |
| 4537258 | Low pressure responsive downhole tool An annulus pressure responsive downhole tool includes a housing having a power piston slidably disposed therein. First and second pressure conducting passages communicate a well annulus with first and second sides of the power piston. A retarding device i... | 08/27/1985 |
| 4458751 | Method and apparatus for selective disengagement of a fluid transmission conduit operable under oppositely directed pressure differentials An apparatus and method for the insertion and disengagement of a tubing string used in a subterranean well subject to oppositely directed pressure differentials is disclosed. A packer apparatus which anchors a portion of the tubing string against rotation... | 07/10/1984 |
| 4421171 | Valve operable under oppositely directed pressure differentials A valve is provided for use in a subterranean well. Rotary manipulation of a fluid transmission conduit results in rotation of a ball valve to selectively open and close the fluid conduit. Rotary manipulation of the fluid conduit is imparted to the ball v... | 12/20/1983 |
| 4415037 | Ball valve loading apparatus A ball valve assembly is provided for elimination of the tearing of the annular elastomeric seal which normally engages the periphery of such ball valve due to the movement of the valve with excessive loading imposed on the elastomeric seal. A spring pres... | 11/15/1983 |
