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| Number | Title | Issue Date |
| 8157008 | Cement evaluation method and tool A method of preparing a wellbore for production includes running a wellbore clean-out string, including a cement evaluation tool and a wellbore cleaning tool, into a wellbore, acquiring data relating to at least one property of a cement bond of the wellbore, using t... | 04/17/2012 |
| 7870897 | Dual function cleaning tool A cleaning tool for cleaning a liner top in a well bore. The tool includes cleaning elements, typically scrapers, which are arranged eccentrically to an axial bore through the tool. The elements are biased outwardly to contact an inner surface of a polished bore rec... | 01/18/2011 |
| 7757771 | Wellhead seal unit A wellhead seal unit for sealing a subsea oil and/or gas well at the wellhead. The unit comprises a sleeve, sealingly engaged to the workstring and to which, blow out preventer rams can engage. The unit allows the workstring to be rotated and reciprocated within the... | 07/20/2010 |
| 7740073 | Wellhead seal unit A wellhead seal unit for sealing a subsea oil and/or gas well at the wellhead. The unit comprises a sleeve, sealingly engaged to the workstring and to which, blow out preventer rams can engage. The unit allows the workstring to be rotated and reciprocated within the... | 06/22/2010 |
| 7735547 | Wellbore cleaning tool and method There is disclosed a cleaning tool for use in cleaning ferrous material from a wellbore, a cleaning assembly comprising a plurality of such wellbore cleaning tools, and a method of cleaning ferrous materials from a wellbore. In one embodiment, a cleaning tool... | 06/15/2010 |
| 7681650 | Valve seat A ball valve seat (10) is disclosed which provides a temporary seal for a plug (40). The valve seat comprises a substantially cylindrical body (30) of a first volume, which defines a seating surface (34). A pressure differential is develo... | 03/23/2010 |
| 7665545 | Pressure controlled downhole operations A method and apparatus for temporarily increasing fluid pressure at a specific location in a work string to perform an operation in an oil or gas well bore. Apparatus is provided which, in a first position provides fluid flow through the work string; in a second pos... | 02/23/2010 |
| 7654316 | Downhole connector A releasable connector (10) for joining tubular members in a well bore. The connector (10) is a mating screwthread (38, 58) which is terminated on each member by abutting projections (24, 64), operating as a ratchet. This ensures torque i... | 02/02/2010 |
| 7628213 | Multi-cycle downhole tool with hydraulic damping A downhole tool which includes a locking bar to allow movement of a sleeve within the tool over a pre-defined range. The range is defined by a recess arranged axially or circumferentially in the tool, in which the bar locates. Fluid can be vented from the recess to ... | 12/08/2009 |
| 7559374 | Dual function cleaning tool A cleaning tool and method of cleaning a liner top in a well bore. The tool includes cleaning elements, typically scrapers, which are arranged eccentrically to an axial bore through the tool. The elements are biased outwardly to contact an inner surface of a polishe... | 07/14/2009 |
| 7530400 | Downhole tool for selectively catching balls in a well bore A ball catcher for selectively catching and retaining drop balls in a well bore. The catcher is located on a workstring. A main bore (18) axially through the catcher is restrained to provide first (26) and second (28) bores of differing diameter... | 05/12/2009 |
| 7510016 | Packer There is disclosed a downhole packer for use in a well bore, and in particular, a packer which can be used for downhole testing. In an embodiment of the invention, a packer tool (10) for mounting on a work string to provide a seal against a tubular (32... | 03/31/2009 |
| 7500526 | Downhole tool A downhole tool (10) for use in isolating a formation in a well bore from fluid pressure introduced from the surface. Mounted in a work string, the tool provides an axial throughbore (18) and radial outlets (40, 42) above and below a permanent s... | 03/10/2009 |
| 7497260 | Junk removal tool A junk removal tool (10) for use in a well bore. The tool includes a multi-faceted face (42) of tungsten carbide to break up large pieces of junk. The junk is then captured in the tool via large area inlet ports (40) and collected in a trap (... | 03/03/2009 |
| 7413023 | Wellhead seal unit A wellhead seal unit for sealing a subsea oil and/or gas well at the wellhead. The unit comprises a sleeve, sealingly engaged to the workstring and to which, blow out preventer rams can engage. The unit allows the workstring to be rotated and reciprocated within the... | 08/19/2008 |
| 7383881 | Stabiliser, jetting and circulating tool A downhole tool (10) for use in oil and/or gas well bores. The tool has a tubular body (20) and a sleeve (22) including stabilizer blades (30). The tool is ball (76), activated, weight activated or hydraulically activated to select... | 06/10/2008 |
| 7314092 | Packer A packer tool for mounting on a work string in an oil and/or gas well is described. The packer is of the compression set type but includes a mechanism to prevent premature setting in the well. A method of running the tool with the completion is provided in order to ... | 01/01/2008 |
| 7228910 | Safety mechanism for weight-set downhole tool A safety trip button (12) is described for a weight-set downhole tool. The button operates between the tool body (36) and a sleeve (34) of the tool, locking them initially together. When the tool reaches a selected formation (44) in a wel... | 06/12/2007 |
| 7191835 | Disengagable burr mill A downhole tool for use in the removal of burrs or other unwanted material from an inner surface of a pipeline, well casing or other tubular. The tool has a plurality of milling elements, which may be biased against the surface or retracted from the surface to disen... | 03/20/2007 |
| 7152686 | Downhole weight bearing apparatus and method A downhole tool for connection in a work string to prevent premature activation of weight set tools on the work string. The tool has moveable pads which contact the tubing wall and thereby support the weight of the work string. The pads are activated by increasing f... | 12/26/2006 |
| 7121343 | Selectively operational cleaning tool A downhole cleaning tool (10) for oil and gas wells. Brushes, scraper, wipers (32) and the like are mounted on a sleeve (14) over a tubular body (12), and the members successively moved towards and away from an inner surface of a tubular ... | 10/17/2006 |
| 7096950 | Combined milling and scraping tool A downhole tool (1) for providing the dual role of cleaning and milling within a wellbore casing or liner is described. In an embodiment scraper blades (6) are mounted on a body (2) together with a milling sleeve (4). Additionally, a cent... | 08/29/2006 |
| 6896064 | Compression set packer and method of use A downhole packer for providing a seal in a well bore to allow integrity testing of the well bore. The packer is set by a sleeve movable on a body of the packer being set down on a formation in the well bore. Movement of the sleeve compresses one or more packing ele... | 05/24/2005 |
| 6302214 | Apparatus and method for inflating packers in a drilling well Apparatus and method is disclosed for setting inflatable packers in a well bore which includes the transporting of settable fluid from the surface with a work string or liner as it is run in the well. The invention therefore negates the requirement of hav... | 10/16/2001 |
| 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 |
| 6253861 | Circulation tool A tool or sub for use in a well bore is adapted to manipulate the circulation path of fluid through a drill string or work string in which the tool is connected. The apparatus has a body member defining an axial flow path with one or more radial outlets t... | 07/03/2001 |
| 6227291 | Compact well clean up tool with multifunction cleaning apparatus A well cleaning tool for cleaning the inside walls of a well casing has at least two types of cleaning members; for example it may have a row of scraper blades and a row of brushes. The tool may also include one or more rotatable stabilizers that serve to... | 05/08/2001 |
| 6152228 | Apparatus and method for circulating fluid in a borehole An apparatus and method for circulating fluid in a borehole is described. The apparatus comprises a tubular assembly (1; 40; 60) which has an axial through passage (21, 18; 47; 19) between a fluid inlet (21) and first fluid outlet (19). The fluid inlet (2... | 11/28/2000 |
| 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 |
