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| Number | Title | Issue Date |
| 7278478 | Tubing string anchoring tool An anchoring tool anchors a tubing string within a surrounding well casing against rotation in either clockwise or counter clockwise directions. The tool includes a tubular housing for connection in line with the tubing string. A fixed jaw is fixedly mounted on the ... | 10/09/2007 |
| 7243728 | Sliding sleeve devices and methods using O-ring seals as shear members Devices and methods for releasably securing components of a device having a sliding sleeve arrangement to prevent premature actuation due to vibration. In a currently preferred embodiment, standard elastomeric O-rings are used as shear members. The O-ring shear memb... | 07/17/2007 |
| 7090007 | Centralizer for wireline tools A centralizer for use in oil well wireline toolstrings comprising a central mounting rod and floating spring mechanisms between which a number of jointed centralizer arms are connected. The jointed centralizer arms have a section with a concave profile disposed near... | 08/15/2006 |
| 7086462 | Wellbore anchor tool An anchor assembly for a downhole tool has upper and lower frictional engagement member for engaging with an inner wall of the casing. The upper frictional members are spring-tensioned, while the lower frictional engagement members slide, to certain degrees, in rela... | 08/08/2006 |
| 7082991 | Slip spring with heel notch In order to prevent premature separation of the slip and slip spring and to simplify production of the slip casing, a self-centering spring engageable with a packer tool slip is modified according to the present invention. A groove located at a lower center of the s... | 08/01/2006 |
| 7077214 | Expansion set packer with bias assist A packer element has a biasing member incorporated with it. The element is either fabricated with the biasing element in a relaxed condition and then the element is stretched prior to insertion downhole or the element is created around the stressed biasing member an... | 07/18/2006 |
| 6968897 | Anti-rotation tool A tool is provided for preventing the rotation of a downhole tool or rotary pump stator, the tool comprising a tubular housing and a jaw which is biased radially outwardly from the tool to engage the casing wall for arresting tool rotation and providing significant ... | 11/29/2005 |
| 6948561 | Indexing apparatus An indexing mechanism is disclosed that can put a tool in a variety of positions while downhole in the face of high static and dynamic loads. In the preferred application, the mechanism controls a movable sleeve on a downhole choke. It contains an indexing feature c... | 09/27/2005 |
| 6920933 | Platform for delivery of downhole tools A platform is used to deliver a tool down a hole by controlling the flow of fluid through and around the platform. The platform has a top surface for receiving the tool. The platform also has a bottom surface to provide guidance through and resistance to the flow of... | 07/26/2005 |
| 6915856 | Apparatus and methods for preventing axial movement of downhole tool assemblies A slip assembly apparatus is adapted (i) to be deployed into a wellbore (ii) to prevent axial movement of a downhole tool assembly in the wellbore when the slip assembly apparatus is actuated and external forces are imposed on the downhole tool assembly; (iii) to al... | 07/12/2005 |
| 6854521 | System and method for creating a fluid seal between production tubing and well casing A well completion system for creating a seal between a production tubing (30) and a well casing (34) positioned within a wellbore (32) comprises a production packer (46) that includes a section of the production tubing (30) and at ... | 02/15/2005 |
| 6688397 | Technique for expanding tubular structures A system for expanding tubular structures. The system comprises a mandrel that is moved through the center of a tubular structure to increase the diameter of the tubular structure via deformation. The system utilizes an expansion device having a mandrel w... | 02/10/2004 |
| 6681853 | Downhole anti-rotation tool A tool is provided for preventing the rotation of a downhole tool or rotary pump stator, the tool comprising a tubular housing and a jaw which is biased radially outwardly from the tool to engage the casing wall for arresting tool rotation and providing s... | 01/27/2004 |
| 6311778 | Assembly and subterranean well tool and method of use A subterranean well tool which is manipulatable by a control mandrel between run-in and set positions within a wellbore having casing includes an assembly which provides a selectively operable lock to prevent premature activation of the assembly from the ... | 11/06/2001 |
| 6039129 | Locking system for a firing mechanism of a downhole tool Locking system (196) is provided for selectively locking an external sleeve (76) to a main body (74) of a downhole tool (14). Locking system (196) comprises a pair of opposed holes (198) formed in the main body (74). The holes (198) capture respective loc... | 03/21/2000 |
| 5979550 | PC pump stabilizer Apparatus is provided for stabilizing a PC pump suspended from production tubing. The stabilizing apparatus is connected to the pump and comprises a tubular body having a cylindrical wall, a longitudinal bore contiguous with the production tubing and thre... | 11/09/1999 |
| 5771969 | Helical bearing anchor and catcher A Helical Bearing Anchor and Catcher for the insertion into a well conduit to anchor well equipment in both linear directions and rotation in one direction. The device has a helical groove in either the mandrel or the drag body to accommodate the helical ... | 06/30/1998 |
| 5685370 | Dual-bore, antirotating pump assembly An assembly for a production string with a downhole pump is disclosed which makes use of the polished bore in the top of the liner already installed in the wellbore. Lugs on the assembly align themselves with longitudinal grooves in the top of the liner a... | 11/11/1997 |
| 5579829 | Keyless latch for orienting and anchoring downhole tools A keyless latch assembly automatically aligns and fixes the axial and circumferential position of a whipstock within a surrounding casing joint. Alignment and fixing of the whipstock ensures proper engagement and orientation of a drill bit relative to an ... | 12/03/1996 |
| 5390735 | Full bore lock system A locking system which includes landing nipples connectable in a well flow conduit and a lock mandrel to which well flow control devices are connectable. The landing nipples have an unrestricted full bore flow passage with a locking groove and profiled lo... | 02/21/1995 |
| 5119875 | Hydraulically actuated lock system A system for sealing and anchoring reeled tubing in a landing nipple in well tubing. An hydraulically actuated lock mandrel having a locator is connected on the reeled tubing and lowered inside the tubing and into the landing nipple. The lock mandrel seal... | 06/09/1992 |
| 5082062 | Horizontal inflatable tool A well tool having an anchor device, straddle packers above and below a port and an internal valve which are operated by longitudinal motion in an inflatable packer device. The well tool anchor is armed by a hydraulic operated plug and set upon downward m... | 01/21/1992 |
| 4997038 | Lock mandrel latch assembly A well tool locking assembly comprising a lock mandrel having locking keys adapted to releasably engage a locking annulus within a well bore, and a latch assembly adapted to maintain the lock mandrel in a desired positional relation to the locking annulus... | 03/05/1991 |
| 4960173 | Releasable well tool stabilizer A mechanism for accurately positioning a well tool in axially concentric relationship to a well conduit comprises a housing having a plurality of stabilizer linkages mounted thereon with one end of each linkage being pivotally secured to the housing and t... | 10/02/1990 |
| 4921044 | Well injection systems Disclosed are selective and no-go systems for injecting fluids in a well and a system for orienting a tool in a landing nipple in a well conduit, which is utilized in the selective set injection system. Each injection system is comprised of a land nipple,... | 05/01/1990 |
| 4896721 | Locator shifter tool An improved locator shifter tool useful in a string of well operating tools. When the tool string is lowered into compatible internal profiled grooving in a well conduit, profiled keys on the locator shifter tool move outwardly into the profiled grooving,... | 01/30/1990 |
| 4886121 | Universal flexbowl wellhead and well completion method A new wellhead housing structure which utilizes identical units of a unique wellhead housing of selected internal diameter and pressure rating. Each wellhead housing utilizes a new flexible bowl ("flexbowl") hanger support ring which may be installed and ... | 12/12/1989 |
| 4852647 | Wire line hold down device A gas generating type fracturing tool includes a propellant charge and an ignitor for initiating combustion of the propellant. When combustion starts, a pressure buildup inside the tool manipulates a brake or drag acting against the inner casing wall to r... | 08/01/1989 |
| 4846270 | Trash barrier tool for wells A well tubing extension joint including a trash barrier. A top sub having an internal locking recess is connected on the upper end of a well packer mandrel. A trash barrier is connected on the lower end of an upper tubing string for releaseably engaging t... | 07/11/1989 |
| 4844159 | Locking device for securing a tool in a well conduit The invention is directed to a locking mechanism for locking a tool to an anchor seat located in the tubing of a well, the locking mechanism comprising keys which are radially movable relative to the axis of the tool, the keys emerging via apertures in th... | 07/04/1989 |
| 4830104 | Actuation indicator for downhole tools A mechanical indicator and arresting apparatus for use with downhole tools which are extendable through wellbore tubing strings by a wireline cable or the like. The indicator apparatus includes a body supporting an elongated actuating rod which is movable... | 05/16/1989 |
| 4749341 | Method and system for supporting a well pump A well pump suspended from a mandrel in a well which is run on a cable placed in tension after the pump supporting mandrel is landed. The mandrel is latched in the well and a much greater force is required to release the mandrel from the tubing than was r... | 06/07/1988 |
| 4616703 | Device for anchoring a probe in a well, by opening mobile arms A device for anchoring a probe in a well by opening at least one arm pivotable with respect to the body of the probe by a spring moving a rod in a guide housing of the body and operating arms. In a closed position of the arm, the rod is locked by a bolt a... | 10/14/1986 |
| 4570707 | Releasable latch for downhole well tools A latch for releasably anchoring well tools at a preselected downhole location within a well bore. The latch includes collet heads which are sized to be received within an annular recess. The downhole location is defined by the annular recess and a no-go ... | 02/18/1986 |
| 4554972 | Well tool locking device A latch for releasably anchoring well tools such as gas lift valves, or the like, in receptacles in well conduits, the latch becoming automatically locked in the receptacle upon reaching its proper position therein.... | 11/26/1985 |
| 4540048 | Locking device for well tools An improved device for releasably anchoring a well tool, or the like, in a well conduit, the device having locking keys thereon which are spring-pressed outwardly, each key having a pair of oppositely facing abrupt lock shoulders which are engageable with... | 09/10/1985 |
| 4509594 | Mudline casing hanger assembly A mudline casing hanger assembly wherein the collet (10) is retained on the hanger body (12) during running by tensile coupons (26). The lower portion (32) of the coupon is retained in slot (24) with collet slots (22) and hanger flowby slots (48) being al... | 04/09/1985 |
| 4465133 | Casing hanger collet A hanger collet (10) for a mudline casing suspension system in the form of a hollow cylinder. Vertical slots (32,34) create a serpentine form which is radially collapsible. Flow space behind the legs (30) permits a flowpath for running and cementing.... | 08/14/1984 |
| 4449736 | Releasable tubing string connector A connector for releasably securing an upper section of a tubing string to a lower section includes a tubular housing containing a retaining sleeve with a collet telescoped therein and having a plurality of spring fingers interlocked with a mating section... | 05/22/1984 |
| 4436152 | Shifting tool An improved shifting tool connectable in a well tool string and useful to engage and position a slidable sleeve in a sliding sleeve device in a well flow conductor. The selectively profiled shifting tool keys provide better fit with and more contact area ... | 03/13/1984 |
