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7255165 |
Field-installable rod guide
A field-installable rod guide for a rod moveable within an oilfield tubular having an interior tubular surface for driving a downhole pump to pump liquids to the surface through the oilfield...
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6830103 |
Roller subs
The present invention provides a roller sub for use downhole in oil or gas wells as part of a toolstring or drill string to reduce friction between the string and wellbore. The roller sub is a...
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6761233 |
Apparatus for propulsion in elongated cavities
An apparatus for propulsion inside an oblong cavity, such as pipes or the like, is disclosed. The apparatus is characterized by comprising a central rotating part comprising an inclined wheel...
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6679325 |
Minimum clearance bow-spring centralizer
A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and...
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6655462 |
Magnetic well cleaning apparatus
Apparatus which can collect loose debris, particularly ferrous debris, has a body 2 with upper 3 and lower 4 stabiliser sleeve. The body 2 has a one or more integral magnets or magnetic...
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6622803 |
Stabilizer for use in a drill string
A stabilizer especially adapted for use with an drill string having an eccentric drilling element, such as a bi-center bit. The stabilizer has a pair of circumferentially displaced blades that lie...
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6585043 |
Friction reducing tool
A centralizer having a first group of rollers ( 5 ) for reducing friction between the centralizer and an oil field tubular ( 7 ) and a second group of rollers ( 4 ) for reducing friction between...
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6533034 |
Centralized stop collar for floating centralizer
A centralizer for engagement with a pipe exterior surface to be positioned downhole in a wellbore. The centralizer includes a collar which can be fastened with set screws or other connector to the...
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6457519 |
Expandable centralizer
A centralizer for laterally positioning an instrument in an opening larger in diameter than the diameter of an opening through which the centralizer can freely pass. The centralizer includes spring...
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6453999 |
Centralizer
A centralizer which comprises a pair of annular bands ( 2, 3 ) which are spaced apart by a plurality of hollow members ( 4 to 9 ) characterized in that the hollow members ( 4 to 9 ) are each...
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6435275 |
Casing centralizer
A casing centraliser and assembly comprising a tubular and a centraliser, the centraliser comprising a plastics material.
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6382333 |
Friction reducing tool for oilfield drilling applications
A friction reducing tool for drilling applications having a plurality of rollers for about the periphery of the tool ( 3 ). The rollers ( 4 ) have extensions ( 7 ) which locate within cavities ( 8...
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6260617 |
Skate apparatus for injecting tubing down pipelines
A method and apparatus which inserts and withdraws tubing from pipes without bending or kinking the tubing. The method and apparatus may be employed to insert and withdraw tubing to depths greater...
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6250394 |
Apparatus for assisting the advancement of a work string and method
An apparatus for assisting the advancement of a work string. In the preferred embodiment, the work string is concentrically disposed within a highly deviated tubular member. The apparatus comprises...
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5908072 |
Non-metallic centralizer for casing
A non-metallic centralizer for casing having a tubular, plastic sleeve adapted to fit closely about a joint of casing, said sleeve having a plurality of blades extending substantially...
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5901798 |
Drill pipe tubing and casing protectors
A drill pipe protector comprises an annular body (820) adapted to surround a drill pipe (824) in a borehole to protect the drill pipe and borehole (or borehole casing) against damage caused by...
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5810100 |
Non-rotating stabilizer and centralizer for well drilling operations
A non-rotating stabilizer tool is provided for connection within a drilling string for stabilization and centralization of the drill string within a well bore being drilled by a rotary drill bit....
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5727627 |
Well rod centralizer/centralizer stop interface with wear reducing surface
Improved wear interface surfaces on well rod stabilizers and stabilizer stops. Well apparatus includes a rotary tool in a string of tubing extending into a well hole in the earth and a rod...
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5692562 |
Well rod, centralizer and centralizer stop interfaces with wear reducing surface
Improved wear interface surfaces on well rod centralizers and centralizer stops. Well apparatus includes a rotary tool in a string of tubing extending into a well hole in the earth and a rod...
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5649603 |
Downhole tools having circumferentially spaced rolling elements
A downhole tool for providing rotary support of a downhole assembly in which the tool is incorporated, the tool also converting rotary contact with the wellbore to a longitudinal force tending to...
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5358040 |
Method and apparatus for running a mechanical roller arm centralizer through restricted well pipe
Method and apparatus for running a mechanical roller arm centralizer through restricted well pipe including roller arms with staggered longitudinal height and limitations upon extension and...
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5247990 |
Centralizer
A centralizer for downhole sucker rods such as those used in oil wells. The centralizer has a central axial aperture for rotatable mounting on a downhole rod of a rod string. The exterior surface...
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5191938 |
Rod guide assembly and method of its installation on a rod shank
A rod guide assembly having a mount moulded on the rod guide shank and a centralizer rotatably mounted on the mount and the method of installing the assembly on a rod guide shank.
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4919205 |
Friction-reducing device
A sucker rod coupling comprising a body member and a plurality of axially and circumferentially spaced roller assemblies adapted to reduce friction and wear between the body member and the well...
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4919202 |
Sucker rod guide bearing
A sucker rod guide bearing attachable at each end to a sucker rod coupling for interconnecting sucker rod sections and centering the sucker rods with respect to a well casing, the bearing includes...
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4913230 |
Sucker rod centralizer
The present invention relates to a device for centralizing at least one sucker rod within a production pipe and for reducing frictional forces between the pipe and the sucker rod(s). The device...
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4793412 |
Centralizer for a polished bar and/or a substance pump piston stem
The present invention relates to a device which can be used to centralize a polished bar and/or a piston stem of a subsurface pump within a production pipe. The device comprises an elongate,...
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4779678 |
Sucker rod guide
A sucker rod guide for use in a string of sucker rods reciprocated in tubing, the guide being formed of an elongated cylindrical member having female threaded recesses at the upper and lower ends...
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4757861 |
Oil well sucker rod coupling assembly
A sucker rod coupling assembly is provided for connecting a pair of sucker rods and centralizing the rods in a tubing string. The coupling assembly finds particular application in connection with a...
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4714110 |
Device to relieve sucker rod torque below ground level in a petroleum well
A torque relief device for use on sucker rod pumps that relieves sucker rod torque deep in the well. Although the device will relieve torque for all sucker rod pumps it will be most effective for...
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4621690 |
Sucker rod coupling
An improved sucker rod coupling is provided for use in a rod string in a pumping oil well. An elongate, cylindrical body member is utilized. This member has internally threaded, longitudinal bores...
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4621169 |
Electric cable construction and uses therefor
The invention encompasses an electric cable which is made up of a metallic shield, a semiconducting polymer sheath surrounding a cable conductor and a moistureproofing layer in the form of a...
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4620802 |
Guide for rotating sucker rods
A guide for use in a string of sucker rods rotated in tubing in a borehole, each guide being formed of an elongated, upright, cylindrical coupling body having female threads at the upper and lower...
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RE31016 |
Anti-friction sucker rod guide assembly
An anti-friction sucker rod coupling and guide apparatus comprises: (a) a rod member having an anti-friction surface along its cylindrical length; (b) fasteners affixed at each end of the rod...
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