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| Number | Title | Issue Date |
| 7845401 | Telescoping wiper plug A wiper plug has a telescoping feature to allow it to be shorter while in a lubricator so as to reduce lubricator length as compared to an extended length for proper propulsion past off center openings such as side pocket mandrels in the string. The wiper has a tele... | 12/07/2010 |
| 7845400 | Launching tool for releasing cement plugs downhole A wiper plug release tool uses a first pump down plug that lands in the tool to pressurize an internal chamber to slide a sleeve that undermines a set of dogs to allow the lower wiper plug to be decoupled from support. The shifting of this sleeve cams a second set o... | 12/07/2010 |
| 7681634 | Apparatus for wiping the interior of pipes An apparatus is provided for cleaning a drill string of drilling mud during tripping, the apparatus being provided with a mass and a volume such that it is able to float on a surface of the drilling mud in the drill string during the tripping operation. The apparatu... | 03/23/2010 |
| 7404436 | Downhole tool A downhole tool for conditioning a casing or liner. The tool includes blades having a circumferential peripheral edge for 360 degree contact with the casing or liner and are formed from a composite material which comprises a polymeric fiber. Such polymeric fibers in... | 07/29/2008 |
| 7395865 | Gas lift plunger arrangement A plunger in a plunger lift system in an oil and gas well includes shaped grooves spaced along the plunger body, angled fins or below the grooves, an elongated interior cavity open at the bottom, and passages connecting the interior cavity to the grooves. The shape,... | 07/08/2008 |
| 7322413 | Equalizer valve assembly A method for controlling a fluid pressure applied to a cementing plug comprises disposing the cementing plug within a casing string to define a trapped volume of fluid within the casing string, isolating a portion of the trapped volume of fluid adjacent the cementin... | 01/29/2008 |
| 7275592 | Oil well pump apparatus An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime ... | 10/02/2007 |
| 7261153 | Packer cups A packer cup for use in sealing the interior of a pipe under pressure is described. The cup uses a bell-shaped end which has a lip of softer material which is integral with the body of the cup which is harder material. Under pressure the lip expands against the side... | 08/28/2007 |
| 7201238 | Low friction face sealed reaction turbine rotors Rotary jetting tool including a rotor with axially-opposed pressure-balanced mechanical face seals. Vented upper mechanical face seal enables the rotor to be operated with the relativity low starting torque achievable using reaction forces from offset jets energized... | 04/10/2007 |
| 7198456 | Floating head reaction turbine rotor with improved jet quality A rotary jetting tool including a pressure-balanced rotor, which is achieved using a vented volume. Axial movement of the rotor relative to the housing caused by pressure imbalances acting on the rotor selectively uncovers or opens a vent that places the volume in f... | 04/03/2007 |
| 7143829 | Downhole tool A downhole tool for conditioning a casing or liner. The tool includes blades having a a circumferential peripheral edge for 360 degree contact with the casing or liner and are formed from a composite material which comprises a polymeric fiber. Such polymeric fibers ... | 12/05/2006 |
| 7028769 | Well bore cleaning and tubular circulating and flow-back apparatus Several well bore clean-out apparatus' are disclosed that provides a method of cleaning a well bore while the apparatus' are being deployed into a well forcing well bore fluid into a work string and for moving solids to the surface. A method of cleaning multiple dia... | 04/18/2006 |
| 7011158 | Method and apparatus for well bore cleaning Apparatus connected to the downhole end of a tubing string for cleaning and flushing wells has a threaded connection to the string and at least one primary jet to direct circulating gases toward the downhole end of the well, together with a plurality of secondary je... | 03/14/2006 |
| 6953086 | Bi-directional traction apparatus A traction apparatus (1) for propulsion along a bore comprises first and second traction members (6) having outwardly extending legs (14). A propulsion system for operating the traction members (6) comprises a turbine-driven shaft (7 | 10/11/2005 |
| 6901999 | Swabbing tool for wells A swabbing tool for wells that filters particulates from fluids passing through the swabbing tool. The swabbing tool comprises a mandrel, at least one swab cup on the mandrel, the mandrel and swab cup being arranged to allow fluids to pass from below to above the sw... | 06/07/2005 |
| 6851480 | Gas operated automatic, liquid pumping system for wells An improved, unattended, liquid pumping device for oil and gas wells featuring a bellows controlled flow valve that opens and closes at preset pressures. Additionally a well head receiver design that releases shut in production gas below the pumping device and provi... | 02/08/2005 |
| 6799638 | Method, apparatus and system for selective release of cementing plugs A running tool for wiper plugs used in cementing well casings into a wellbore. The running tool and setting balls or darts used to launch the plugs are retrievable following deployment of the plugs. Flapper valve assemblies on the wiper plugs are activated after the... | 10/05/2004 |
| 6745839 | Borehole cleaning apparatus and method Oilfield cleaning apparatus is provided for cleaning the inner wall of an oilfield tubular. The apparatus comprises a body to be introduced into the tubular, the body being provided with annular cleaning elements. Furthermore a rotary drive acts to oscillate the cle... | 06/08/2004 |
| 6739391 | Surface deployed cement separation plug A separation barrier for placement in an open well bore or casing, to prevent migration of cement slurry downwardly into the drilling fluid, facilitating the placement of a cement plug to segregate a well bore into uphole and downhole portions. The barrier has an an... | 05/25/2004 |
| 6725917 | Downhole apparatus Apparatus (10) for facilitating coupling and cementing of downhole tubulars (12, 28) comprises a tubing section (12, 10) for use in lining a bore. The tubing section has upper and lower ends and defines a tubing wall having cement outlets (20... | 04/27/2004 |
| 6595282 | Fluid filled drill pipe plug A wiper plug for downhole use is disclosed. It features an inflatable structure that allows it to ride inside tubulars that change or gradually vary in inside diameter. In a preferred embodiment the bladder is actuated by fluid displaced by a biased pisto... | 07/22/2003 |
| 6523612 | Method and apparatus for cleaning wellbore casing One or more brush bodies fabricated from an incompressible material, for example, from high density polyurethane, high density polyethylene, high density polypropylene, nylon, ORLON--synthetic forming polymers and copolymers of acrylic acid or its derivat... | 02/25/2003 |
| 6513590 | System for running tubular members The present invention relates to a wiper plug and internal drop ball mechanism that may be used in conjunction with a downhole surge reduction tool to run, hang, and cement casing liners in a wellbore. The apparatus of the present invention comprises a wi... | 02/04/2003 |
| 6491103 | System for running tubular members The present invention relates to a wiper plug and internal drop ball mechanism that may be used in conjunction with a downhole surge reduction tool to run, hang, and cement casing liners in a wellbore. The apparatus of the present invention comprises a wi... | 12/10/2002 |
| 6460616 | Traction apparatus A traction apparatus (1A) includes at least one traction member (51) when engages a surface (10A) against which traction is to be provided. The traction member can move relatively freely in one direction over the surface but has high resistance to movemen... | 10/08/2002 |
| 6453996 | Apparatus incorporating jet pump for well head cleaning A cleanup tool is described for use in a wellbore, the tool having a body which defines flow passages which communicate with the venturi chamber, the venturi chamber itself communicating with a discharge passage for radially or near radially discharging j... | 09/24/2002 |
| 6347667 | Well clean-up tool with improved cleaning member Well cleaning apparatus comprises a tubular body member attached to a work string which supports one or more resilient and pliable cleaning members. Each cleaning member is provided with a means for allowing bypass as sized and adapted to wipe the well ca... | 02/19/2002 |
| 6311774 | Method and apparatus for securing a well casing to a wellbore A well casing for receiving well fluid from a producing formation includes a first tubular section that has a tortuous outer surface for directing the flow of a bonding agent around the exterior of the first tubular section. The first tubular section has ... | 11/06/2001 |
| 6220356 | Method and apparatus for well treating A well, such as a natural gas well, may be treated to increase production of gas by inserting into the tubing string a water soluble carrier containing a well treating chemical adapted to aerate fluids standing in the tubing string. The dissolvable carrie... | 04/24/2001 |
| 5921320 | Process and device for raising liquids from wells The invention relates to the gas and oil producing industry and can be used in raising liquids from oil, gas and gas condensate wells. The process for raising liquids from wells involves periodically lowering a lowerable assembly into a tubing string and,... | 07/13/1999 |
| 5865245 | Stuffing box gland A stuffing box gland 20 that cooperates with packing 38 positioned within a stuffing box 18 to seal between a stuffing box housing 42 and a moveable polished rod 27 of an oilfield pump assembly 10. A lower end of a gland housing 46 forms a flange 50 exten... | 02/02/1999 |
| 5836386 | Wiping element for a drill pipe ID wiping device An improved wiper element for a pipe ID comprising a resilient wiping element mounted on a pipe wiper mandrel. The wiper element further having oppositely disposed petals to enable wiping within a large pipe, and opposing petals are defined by transverse ... | 11/17/1998 |
| 5732774 | Drill wiper assembly An improved pipe wiping device is set forth which incorporates from an upper end fishing neck, a threaded connection for a central mandrel and multiple pipe wiping elements which are formed of flat resilient sheet material cut in circular fashion and havi... | 03/31/1998 |
| 5641018 | Apparatus and method for cementing wells An apparatus and method for cementing a pipe in a well. A wiper is engaged with a pipe section as the pipe section is lowered into the wellbore. The wiper contacts the wellbore as the pipe section is reciprocated or rotated within the wiper. The wiper con... | 06/24/1997 |
| 5462115 | Gas and oil well swab A swab is movably mounted within a well casing and automatically removes fluid from the well upon accumulated pressure at the bottom of the casing reaching a predetermined amount to raise the swab within the casing. The swab has a hollow body with an inne... | 10/31/1995 |
| 5127472 | Indicating ball catcher An indicating ball catcher for use in a downhole drill pipe or tool string. The ball catcher comprises an upper body portion having an inlet opening smaller than any ball pumped thereto and a lower body portion. An elongated case interconnects the upper a... | 07/07/1992 |
| 5119874 | Swab cup and swab assembly A swab assembly for use within a pump barrel includes a longitudinal swab bypass mandrel which has a top end connectable to a reciprocating member and at least one longitudinal bypass channel on its circumference and axially spaced stop shoulders at each ... | 06/09/1992 |
| 5012866 | Drill stem mud wiping apparatus A wiping tool for free fall in a drill stem is disclosed. The wiping tool is adapted to be dropped in the drill stem to wipe the inner wall. It is constructed with an elongate mandrel terminating at upper and lower subs. The upper sub supports a fishing n... | 05/07/1991 |
| 4923011 | Drill stem mud wiping apparatus A wiping tool for free fall in a drill stem is disclosed. The wiping tool is adapted to be dropped in the drill stem to wipe the inner wall. It is constructed with an elongate mandrel terminating at upper and lower subs. The upper sub supports a fishing n... | 05/08/1990 |
| 4896720 | Method and system for cleaning well casing The inside wall surface of a wall casing or tubing string is cleaned by providing an apparatus including a resilient flanged plug member and an elongated body having plural helical wraps of wire bristles disposed on the exterior surface thereof for engage... | 01/30/1990 |
