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| Number | Title | Issue Date |
| 6112811 | Service packer with spaced apart dual-slips Apparatus and methods are provided for anchoring within tubular structures and releasing therefrom. A packer capable of withstanding very large combined loads and differential pressures is provided with multiple dual slips. The packer uniquely distributes... | 09/05/2000 |
| 6065536 | Apparatus for setting a liner in a well casing A system for setting a liner in a well casing which has a liner, a liner hanger, a polished bore receptacle, a packer which can be actuated by applying downward pressure to the polished bore receptacle, a running tool, and a junk bonnet which extends betw... | 05/23/2000 |
| 5988286 | Cable anchor assembly A cable anchor for preventing longitudinal movement of a cable within a conduit to transfer the weight of the cable to the conduit, comprises a housing connectable to the cable. An arm member is connected to the housing and is movable from a retracted pos... | 11/23/1999 |
| 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 |
| 5975205 | Gravel pack apparatus and method A thru-tubing gravel packing operation utilizing inflatable packing elements and a flow cross-over assembly which selectively opens flow ports for effecting steps in the gravel packing operation and which further provides concentric flow paths through the... | 11/02/1999 |
| 5941313 | Control set downhole packer A packer for sealing a space downhole in a well. The packer includes a deformable sheath having a body and first and second ends for defining an interior volume proximate to a tool surface. A material located within the interior volume is deformable, when... | 08/24/1999 |
| 5931237 | Soil testing assemblies An apparatus for securing a soil testing device and other attachments necessary for soil testing near the bottom of a borehole uses a pair of clamps with gripping teeth that interlock with similar gripping teeth in the internal wall of the auger. The late... | 08/03/1999 |
| 5909771 | Wellbore valve A new fill valve for use in cementing operations in a wellbore extending down into the earth has been invented, the fill valve having a tubular housing having a valve seat, a valve member slidably mounted in said tubular housing, a spring for biasing said... | 06/08/1999 |
| 5794694 | Running tool A running tool particularly useful for running liners on coiled tubing is disclosed. A torque-transmitting outer sleeve is employed which initially traps the collets. The collets are engaged to the liner by relative mechanical movement and thereafter lock... | 08/18/1998 |
| 5769163 | Adjustable flexibility anchor device with retractable arms for well tools An elastic force generated by a volume of compressed gas in a chamber (7b) of a cavity (7) interior to the body of a well tool (1), acting on a piston (8), is used to open arms (4) intended to anchor the tool to the wall of a well (2). In order to close t... | 06/23/1998 |
| 5765640 | Multipurpose tool A multipurpose tool is disclosed which has as one of its purposes anchoring coiled tubing during certain downhole operations such as milling. In the anchor format the tool is run in in the retracted position and then expanded to get a grip on the casing o... | 06/16/1998 |
| 5586601 | Mechanism for anchoring well tool A longitudinally compact mechanism for anchoring a well tool to a casing includes a plurality of first slip members and a plurality of second slip members. The first slip members and the second slip members are carried on the well tool at the approximate ... | 12/24/1996 |
| 5575331 | Chemical cutter A downhole chemical cutting tool for cutting downhole tubular goods and supporting the tubular goods within the well through a load bearing hub section in the tool. The tool comprises an elongated tool body having a upper head section which is adapted to ... | 11/19/1996 |
| 5553672 | Setting tool for a downhole tool A setting tool allows setting a hydraulic liner hanger in a deviated wellbore. Subsequent to setting the liner hanger through pressure developed within the setting tool, the setting tool is reconfigured to allow full-bore passage therethrough. In the pref... | 09/10/1996 |
| 5551512 | Running tool A running tool particularly useful for running liners on coiled tubing is disclosed. A torque-transmitting outer sleeve is employed which initially traps the collets. The collets are engaged to the liner by relative mechanical movement and thereafter lock... | 09/03/1996 |
| 5474127 | Annular safety system for oil well An annular safety system for an oil well. The annular safety system is in the form of a hanger mechanism. The hanger mechanism is particularly effective in an oil well equipped for gas lift operation where gas is injected into an annular space between the... | 12/12/1995 |
| 5421414 | Siphon string assembly compatible for use with subsurface safety devices within a wellbore A hanger assembly used to support tubing, such as a siphon string, and other tools beneath the surface of a wellbore within casing or production tubing. The assembly includes a setting mechanism having first and second sleeves responsive to increased pres... | 06/06/1995 |
| 5417288 | Hydraulic set liner hanger and method A liner hanger assembly structurally interconnects a casing within a bore hole and a tubular liner suspended from the casing. The hanger body includes a plurality of circumferentially spaced piston bores. A plurality of slips are provided circumferentiall... | 05/23/1995 |
| 5413173 | Well apparatus including a tool for use in shifting a sleeve within a well conduit Well apparatus is disclosed in which a tool is lowered on a pipe string into a well conduit for shifting a sleeve slidably mounted within a tubular housing connected as part of the well conduit. The sleeve has vertically spaced grooves about its inner dia... | 05/09/1995 |
| 5398764 | Well tool system and method for use in a well conduit A well tool system and a method utilizing said system e.g. pressuring a well conduit to determine whether the conduit has leaks. The system allows a plurality of no go type landing nipples to be used in a conduit without prohibitively restricting the flow... | 03/21/1995 |
| 5390739 | Hydraulic tool and hydraulic pressure device Hydraulic tool for carrying out relative axial movements in an oil or gas well by means of hydraulic pressure through a hollow tubing string, comprising a cylindrical tool housing and axially movable cylinder-piston members in the housing. There are provi... | 02/21/1995 |
| 5381862 | Coiled tubing operated full opening completion tool system A coiled tubing operated full opening completion tool system for use in a well bore. The tool system comprises a completion tool, such as a casing valve, disposed in a well casing. The tool system further comprises a positioner tool for opening and closin... | 01/17/1995 |
| 5379838 | Apparatus for centralizing pipe in a wellbore A system for centralizing casing pipe in a wellbore includes lateral pistons in the side wall of the casing string which are movable by force applied to their inner end, from a retracted position within the maximum exterior profile of the casing pipe stri... | 01/10/1995 |
| 5370186 | Apparatus and method of perforating wellbores An anchoring system for a perforating gun is disclosed which supports the gun from above. The anchor can be run in with conventional tools and is settable in the wellbore by pressurizing the wellbore. Upon increasing pressure in the wellbore, the anchor s... | 12/06/1994 |
| 5348090 | Expanded slip well anchor A well anchor having a body with a mandrel movably extending therethrough with first and second slips connected to the mandrel. Each of the slips includes a wedge surface and the wedge surfaces engage each other whereby movement of the first and second sl... | 09/20/1994 |
| 5346016 | Apparatus and method for centralizing pipe in a wellbore A system for centralizing casing pipe in a wellbore includes lateral pistons in the side wall of the casing string which are movable by forces applied to their inner end, from a retracted position within the maximum exterior profile of the casing pipe str... | 09/13/1994 |
| 5322118 | Downhole chemical cutter Chemical cutting tool for use within a well bore for cutting very small diameter tubular goods. The tool has an elongated tool body having anchoring means for anchoring the tool within a conduit and a pressure generating section. A cutting section of the ... | 06/21/1994 |
| 5287920 | Large head downhole chemical cutting tool A downhole chemical cutting tool for use in a well bore to cut large diameter conduits including an elongated tool body having a chemical section adapted to contain a chemical cutting agent and a cutting section adapted to receive the cutting agent from t... | 02/22/1994 |
| 5242019 | Downhole tool with increased friction surface and method of manufacture An inflatable packer is shown which includes a tubular mandrel and an inflatable, elastomeric sleeve secured to the mandrel at opposing ends thereof. A friction enhancing media is applied to the exterior surface of the mandrel by wrapping a grit laden tap... | 09/07/1993 |
| 5228518 | Downhole activated process and apparatus for centralizing pipe in a wellbore This invention relates to a downhole activated centralizer for centralizing pipes in a wellbore for the exploration and production of hydrocarbons. The downhole activated centralizers are carried within either the pipe casing or the collars or both and re... | 07/20/1993 |
| 5220959 | Gripping inflatable packer A gripping inflatable packer having an elastomeric bladder expandable to sealingly engage the outer surface thereof against the wall surface of the well bore to effectively inhibit the passage of well fluid through the well bore. The gripping inflatable p... | 06/22/1993 |
| 5183111 | Extended reach penetrating tool and method of forming a radial hole in a well casing An extended reach penetrating tool which includes a tubing string lowered into a casing, anchored in position and including a cutting tool for forming a lateral hole in the casing. A formation penetrating tool is then substituted for the cutting tool on t... | 02/02/1993 |
| 5180010 | Multiple acting lock for gravel pack system A multiple acting lock is provided which prevents premature setting of the packer of a gravel pack tool by the setting piston of a setting tool. The lock comprises a locking cylinder which when in the locked position rotationally locks the setting tool wi... | 01/19/1993 |
| 5168933 | Combination hydraulic tubing hanger and chemical injection sub A mudline tubing hanger is disclosed in which the tubing hanger is provided as an integral part of the tubing string and is set within the casing by an hydraulic setting mechanism driven through an external control line and actuated by a wireline shifted ... | 12/08/1992 |
| 5146983 | Hydrostatic setting tool including a selectively operable apparatus initially blocking an orifice disposed between two chambers and opening in response to a signal A hydrostatic setting tool, adapted for setting an anchored device in a wellbore, includes a housing having a pair of ports exposed to well fluid at hydrostatic pressure. The ports lead to a shoulder of a setting mandrel. A barrier is disposed diametrical... | 09/15/1992 |
| 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 |
| 5092400 | Coiled tubing hanger The invention relates to a coiled, endless, tubing hanger, for positive control of well bore pressure. A hanger tool is provided for use with coiled tubing strings when the strings are being installed in new or existing cased well bores. Means are provide... | 03/03/1992 |
| 5086845 | Liner hanger assembly A liner hanger assembly is disclosed for setting within a casing conduit and carrying a liner string therebelow. The assembly has slip elements for gripping the casing with each of the slip elements having symmetrically angled teeth such that only one set... | 02/11/1992 |
| 5086844 | Hydraulic release oil tool A hydraulic setting and release tool has a shear out setting assembly attached to a string coupling member. Upon reaching a predetermined hydraulic pressure, a piston of the tool shears restraining shear pins and moves in a body of the tool to release dog... | 02/11/1992 |
| 5070941 | Downhole force generator A hydraulic well tool for running into a flow conduit of a well on a handling string, such as reeled tubing or jointed pipe, for generating and applying an axial force to an object in the well, the well tool including an anchoring mechanism actuatable by ... | 12/10/1991 |
