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7306060 |
Drilling assembly with a steering device for coiled-tubing operations
The present invention provides a drilling assembly for drilling deviated wellbores. The drilling assembly includes a drill bit at the lower end of the drilling assembly. A drilling motor provides...
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7299885 |
Downhole drill string having a collapsible subassembly and method of loosening a stuck drillstring
A method and apparatus for allowing a downhole drill string to be stuck at one location and continue to rotate above the stuck section. The apparatus provides a method for collapsing the stuck...
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7267184 |
Modular housing for a rotary steerable tool
According to one embodiment of the invention, a rotary steerable tool includes a drive shaft configured to be coupled to a drill string at an upper end thereof and configured to be coupled to a...
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7216726 |
Downhole fluid-tight flexible joint
A downhole tool comprises a joint, and a resilient member 65 which extends through the joint and provides a restoring force which tends to strengthen the joint. The joint may comprise a flex...
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7192094 |
Auger flight support system
An auger support assembly for use with an augering system for mining which bores a pair of side-by-side holes through a coal seam using dual side-by-side augers. Each auger includes a drilling...
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7188689 |
Variable gauge drilling apparatus and method of assembly therefor
A variable gauge drilling apparatus and a method for assembling a variable gauge drilling apparatus for insertion in a subject borehole. The variable gauge drilling apparatus includes: an apparatus...
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7182160 |
Drill string element having at least one bearing zone, a drill string, and a tool joint
The drill string element has at least one bearing zone for bearing against the wall of the borehole during drilling. The bearing zone comprises at least one bearing segment extending in the axial...
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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...
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7000713 |
Blockless reamer
A blockless reamer drilling tool comprising an elongated tool body and a reamer unit. The reamer unit includes, a shaft having a first end and a second end and a cutter mounted on the shaft between...
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6968904 |
Method and apparatus for operations in underground/subsea oil and gas wells
A method and apparatus for advancing a rotating motorized downhole tool for operations in oil/gas wells. The apparatus is adapted for drilling and milling away of casing sections in the wells, as...
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6935442 |
Stabilizer device for rotary string of drill rods with reduced friction
The stabilizer ( 1 ) has a tubular central body ( 3 ) having means for connection ( 3 a , 3 b ) to a first and a second component of the string of drill rods and at least one external contact...
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6688409 |
Friction reducing tool and method for its use in a wellbore
A friction reducing tool ( 1 ) having a generally tubular body ( 2 ) and three or more groups of rotatable castors ( 3 ) provided about the periphery of the body, wherein the castors of each group...
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6679559 |
Auger flight support for plural auger coal mining systems
An auger flight support for use with an augering systems for mining which bores a pair of side-by-side holes through the coal seam using respective augers. Each auger includes a drilling section...
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6668945 |
Method and apparatus for milling a window in a well casing or liner
A method and apparatus for milling a window in a downhole structure, such as a casing or a liner, includes a mandrel that supports milling elements arranged in a predetermined pattern. In one...
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6666267 |
Downhole tools
A casing centralizer is provided. Such a casing centralizer includes a tubular body substantially comprised of a plastics material and having an innermost surface, an outermost surface, and opposed...
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6655477 |
Friction-reducing drill pipe component
The friction reducing drill pipe component in the form of a sub ( 10 ) is adapted to form part of a drill string. The sub ( 10 ) comprises a tubular mandrel ( 12 ) having first and second ends for...
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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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6588517 |
Boring apparatus
Apparatus for boring a hole from an inside of a casing outwardly at an angle relative to a longitudinal axis of the casing comprises a drill shoe having a longitudinal axis and being positionable...
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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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6557654 |
Drill pipe having a journal formed thereon
A drill pipe ( 1; 12 ) has a journal ( 2; 15 ) formed thereon. Integrally formed stop collars ( 10, 11; 16, 17 ) are provided at each end of the journal ( 2; 15 ). The arrangement enables rotatable...
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6494274 |
Axle, a friction reducing fitting and an axle installation method
A friction reducing fitting for downhole applications. The fitting has a body portion ( 3 ) for securement about a tubular member, the body portion having a pair of apertures ( 5, 6 ). A roller ( 1...
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6427783 |
Steerable modular drilling assembly
In general, the present invention provides a modular drilling assembly having a module for contactless power and data transfer over a nonconductive gap between rotating and non-rotating members of...
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6394198 |
Frictional vibration damper for downhole tools
A damper for downhole tools consisting of a plurality of damping inserts arrayed about the tool body so that their radial protrusion describes a circumference greater than desired gauge of the...
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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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6321857 |
Directional drilling apparatus and method utilizing eccentric stabilizer
Directional drilling apparatus (26) for location on a drill string (20) comprises a stabilizer (32) having a mandrel (38) for connection to the drill string (20) and an eccentric non-rotating...
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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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6227313 |
Anti-torque tool
A downhole tool for engaging a borehole wall of a well, with outwardly displacing gripping elements to engage the borehole wall in such a way as to prevent rotation of the tool relative to the...
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6209667 |
Drill string fitting
A fitting for reducing friction between a drilling string and the wall of a well. In a first aspect the fitting has recesses (6) provided along the bore of the fitting to lubricate the interface...
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6109374 |
Roller stabilizer
An improved stabilizing tool includes a body with a pocket, and a roller rotatably disposed in the pocket. The body includes a fluid passageway formed axially therethrough. The passageway has a...
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6059051 |
Integrated directional under-reamer and stabilizer
The present invention is an apparatus for use in drilling operations. It uses an under-reamer having a plurality of elongated arms with cutting elements at the ends of the arms for enlarging a...
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6033152 |
Pile forming apparatus
An improved lateral soil displacement and compaction auger (24) is provided including a central shaft (34) equipped with a central cementious material pipe (42), helical flighting sections (36,38)...
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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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5960895 |
Apparatus for providing a thrust force to an elongate body in a borehole
A downhole tool for providing a thrust force to an elongate body extending in a borehole formed in an earth formation is provided. The tool comprises at least one rotatable body provided with a...
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5931239 |
Adjustable stabilizer for directional drilling
A drillstring carries a stabilizer sub above the drill bit for steering or directing drilling. The stabilizer body is rotatably carried by the stabilizer sub, wherein the stabilizer body remains...
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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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5836407 |
Articulated tool for drilling oil, gas geothermal wells
The invention relates to a tool for drilling oil, gas or geothermic wells. The tool includes two main members, a hollow shaft (1) and a blind tool body (2) more elongate than conventional tool...
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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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5833015 |
Method and apparatus for sinking pipes or cables into a pilot borehole
Method and apparatus for sinking pipes (8) or cables into a pilot borehole (4) by use of a drill string (3) including an expansion drill bit driven to rotate and pull is disclosed. The expansion...
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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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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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5715898 |
Stabiliser for a downhole apparatus
A downhole apparatus, such as a stabilizer, having rotary bearing members in the form of bearing balls (36) which are each mounted for omni-directional movement within a bearing assembly (20)...
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5711386 |
Equipment to reduce torque on a drill string
A drill string torque-reducing sub-assembly is disclosed comprising: a hollow longitudinally-extending mandrel (1) capable of being coupled between adjacent first and second drill pipes in the...
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5667027 |
Drill stabilizer
A drill stabilizer is formed of housing with a mandrel extending from the housing between a first shoulder and a second shoulder, the mandrel having a mandrel axis and an outer diameter adjacent...
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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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5603386 |
Downhole tool for controlling the drilling course of a borehole
A downhole tool connectable to a drill string by a connection atop the tool includes a mandrel for connection with the drill string, the mandrel being rotatable within a body. A plurality of blades...
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5579854 |
Drill pipe casing protector and method
A drill pipe casing protector has an inner hub member releasably secured to the exterior of a drill pipe to rotate therewith and an outer buffer ring rotatably mounted on the inner hub to allow...
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5538091 |
Bottom hole assembly
The present invention provides a bottom hole assembly (BHA) for connection to a drillstring for use in directing the path of a drill bit while rotary drilling, the BHA comprising an apparatus for...
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5522467 |
System and stabilizer apparatus for inhibiting helical stack-out
A connector for drill string elements is formed as a cylindrical body having a bore and threaded sections on opposite ends for connecting drill tubing or pipes together. A plurality of bearings are...
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5429198 |
Down reaming apparatus having hydraulically controlled stabilizer
A down reaming apparatus has an upper stabilizer which supports the down reaming apparatus in the bored hole. A plurality of shoe assemblies are radially attached to the hub of the upper...
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5407011 |
Downhole mill and method for milling
A mill assembly having a mill face for milling material in a downhole milling operation is received in a casing or well bore having an internal wall having a first diameter. The mill face has a...
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