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6595284 |
Wire guard device for wells
A one-piece wire guard device formed of non-metallic material for use in wells includes an inner ring having a split therein defining an opening and having a portion of reduced thickness defining a...
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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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6585052 |
Casing centralizer
A tubing centralizer for borehole drilling disclosed. The centralizer includes a retaining collar and an outer sleeve. In a method for installing the centralizer onto a joint of tubing, the...
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6561280 |
Method of injecting tubing down pipelines
A new method and apparatus have been developed which inserts and withdraws tubing from pipes without bending or kinking the tubing. Beneficially, the new method and apparatus may be employed to...
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6543533 |
Well tubing rotator
A mandrel rotator is provided is mounted in a housing for coupling to a well casing head. The mandrel rotator comprises of an annular gear having external gear teeth and an axial opening. The...
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6484802 |
Downhole scraper assembly
This invention relates to apparatus for scraping the inner surface of a wellbore. A scraper assembly ( 2 ) is provided comprising a scraper element ( 6 ) incorporating: a generally cylindrical...
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6484803 |
Dual diameter centralizer/sub and method
A dual diameter centralizing sub for maintaining stand-off and/or centralizing a tubular member inside a larger diameter tubular member, for instance, in a wellbore. The centralizer is provided...
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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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6453998 |
Progressive lock integral joint centralizer
The present invention relates to a centralizer for use downhole in a well. The centralizer body has one or more contact arms attached to a movable collar. The body is run into the well to a...
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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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6443226 |
Apparatus for protecting sensors within a well environment
An apparatus for protecting sensing devices disposed on an outer surface of a pipe is provided. The apparatus includes a housing and a plurality of bumpers. The housing is attached to the outer...
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6439304 |
Stand-off device
A stand-off device for tubulars comprising a sleeve adapted to fit around a tubular, the sleeve comprising an outer surface and a plurality of blades extending along the outer surface of the...
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6378633 |
Drill pipe protector assembly
A drill pipe protector assembly for providing hydraulic lift and improved sliding lubrication to a drill string. The protector defines a tubular sleeve that is attached to a section of drill pipe...
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6283205 |
Polymeric centralizer
A polymeric centralizer for casing having a body adapted to fit closely about the casing, a plurality of blades extending substantially longitudinally along an outer surface of body, a slit through...
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6260625 |
Apparatus and method for torsional and lateral centralizing of a riser
A centralizing device is provided for a riser of an offshore well platform having an opening through which the riser passes from the platform to a subsea wellhead. The riser has generally planar...
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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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6230796 |
System and device for optimizing use and installation of auxiliary equipment for down hole operations in wells
A system for optimizing the use of auxiliary equipment for down hole operations in wells includes an elongated housing for mounting in a metallic pipe, a plurality of retractable elements mounted...
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6209638 |
Casing accessory equipment
Casing accessory equipment especially adapted for restricted diameter applications. The present invention comprises casing accessory equipment, including casing string centralizers, float shoes and...
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6112813 |
Method of providing a conduit and continuous coiled tubing system
Coiled tubing for weld purposes is provided with a conduit which can be connected to a power source at one end and to a power device intended to be lowered into the well at the other. The tubing is...
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6092593 |
Apparatus and methods for deploying tools in multilateral wells
Improved apparatus and methods for deploying tools in multilateral wells are disclosed. Certain ones of the apparatus and methods include a downhole tool centralizer assembly for coupling to a...
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6032748 |
Non-rotatable stabilizer and torque reducer
An exemplary stabilizer and torque reducer which will engage a wellbore casing and locate the drill string substantially toward the concentric center of the wellbore casing. The device is capable...
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6015015 |
Insulated and/or concentric coiled tubing
A coiled tubing composite comprising insulated coiled tubing, concentric coiled tubing and insulated concentric coil tubing, including structure with centralizers and providing an annulus for...
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6012529 |
Downhole guide member for multiple casing strings
A downhole casing guide member comprising a structure having a unitary formation wherein in a plane perpendicular to a center longitudinal axis of the structure, the unitary formation is generally...
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6009949 |
Apparatus and methods for sealing a wellbore junction
A sealed wellbore junction is conveniently and efficiently created in a subterranean well. In one described embodiment, a first assembly including a deflection device is positioned in the well...
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6006830 |
Casing centraliser
A casing centraliser (10) includes an annular body (12) and a substantially cylindrical bore (16) extending longitudinally through the body (12). A number of blades (14) extend longitudinally along...
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5937948 |
Extruded casing centralizer
An integrally formed, solid casing centralizer for centering casing strings in oil and gas wells. The casing centralizer includes a central body having a bore adapted to closely engage a casing...
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5934378 |
Centralizers for a downhole tool
A measurement while drilling tool has upper and lower centralizers secured to an upper end. Each centralizer comprises three major components: a housing, a tapered nose, a shaft which is slides in...
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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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5842518 |
Method for drilling a well in unconsolidated and/or abnormally pressured formations
A fiber reinforced cement lining for an unconsolidated or otherwise problematic zone in a wellbore is built up by first under-reaming the section of the wellbore to be stabilized by the cement...
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5833018 |
Drill pipe/casing protector
A non-rotating drill pipe/casing protector is disclosed. The protector has a bi-directional thrust bearing which can be mounted uphole or downhole from the protector. The bi-directional thrust...
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5833019 |
Pipe protector
A casing/drillpipe protector is disclosed that has a composite structure made up of two separate parts. Both parts have cages to secure skeleton functions. The inner part is nested within the outer...
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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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5803193 |
Drill pipe/casing protector assembly
A drill pipe/casing protector assembly for an underground drilling system comprises a well bore in an underground formation, a fixed tubular casing installed in the well bore, a rotary drill pipe...
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5803170 |
Well line protective apparatus
Installed in the tubing string portion of an offshore well rig are a vertically spaced pair of tubular well line protective devices. The upper device extends vertically through the openings in the...
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5785125 |
Mechanical thru-tubing centralizer
Mechanical thru-tubing centralizers 12, 14 positioned along a work string WS centralize a tool such as an abrasive cutter AC within a large diameter casing C after passing through a small diameter...
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5778976 |
Casing installation equipment
Improvements in casing installation components are described. The modified construction comprises radial support pedestals (2) incorporating rollers (3) on the outside of the support pedestals so...
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5758723 |
Fluid pressure deactivated thru-tubing centralizer
A thru-tubing centralizer 10, 102 positioned along a tubular T after passing through a small diameter tubing string TS centralizes the tubular within a large diameter casing string CS. The...
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5692563 |
Tubing friction reducer
A tubing friction reducer is mounted on a length of tubing within a bore hole. The friction reducer includes a cylindrical body having a first section and a second section hingedly secured around...
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5613559 |
Decentralizing centralizing locating and orienting subsystems and methods for subterranean multilateral well drilling and completion
A decentralizer for a diverter, a centralizing guide bushing and a downhole-deployable locating and orienting subsystem. The subsystem is capable of three modes of operation: (a) a running mode in...
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5595248 |
Pipe alignment apparatus
An apparatus and method for centering a pipe string within a slip bowl to facilitate the setting of a set of slips about the pipe string wherein the slip bowl is disposed in a floor of a drilling...
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5575333 |
Centralizer
A centralizer apparatus has been developed which, in one aspect, has a tubular body with an exterior surface, a collar movably emplaced around the tubular body and movable longitudinally thereon, a...
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5566754 |
Centralisers
A centraliser has been developed which in one aspect an upper ring and a lower ring connected by six rigid members. The centralizer can be mounted on casing to be lowered down deviated bores. The...
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5419395 |
Eccentric fluid displacement sleeve
An eccentric fluid displacement sleeve is disclosed for use with a measurement-while-drilling instrument, to convert the instrument for use in different size boreholes. The sleeve is made eccentric...
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5390966 |
Single connector for shunt conduits on well tool
A well tool (e.g. well screen) having a single connector for fluidly connecting the shunt conduits carried by adjacent joints of a well tool to thereby eliminate the need for separate, individual...
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5383519 |
Apparatus for rotating a tubing string of a pumping wellhead
An apparatus for rotating a tubing string of a pumping wellhead is described which includes a housing having a first end, a second end, and an interior. The first end has a stationary external...
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5379836 |
Clamps for use with well tubulars
The clamp mounts a cable and service lines in spaced relationship to a tubing string used in producing a well, and formed of lengths of tubing joined by a coupling. The clamp comprises first and...
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5377752 |
Guard device
A guard device for use with a drop pipe in a well casing includes a pair of similar guard sections each being formed of a plastic material. Each section includes inner and outer arcuate members...
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5377751 |
Apparatus and method for centralizing downhole pipe and blast joints
The present invention utilizes a centralizer having a plurality of segmented stress risers. The segmented stress risers are designed to allow sufficient strength to maintain the tubing in a...
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5372192 |
Drag block for increasing the fluid resistance of well production tubing inadvertently dropped in a cased hole of an oil or gas well
The present invention pertains to a drag block that is attached over the exterior of, or screwed onto as an integral part of, oil well production tubing to increase the fluid resistance of the...
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