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8167034 |
Device for centering a well casing
A device (100, 200) is for centering a drill casing (7) within a wellbore (3). The device (100, 200) includes a generally tubular body (9) having an outer surface (11) facing the wellbore (3). A...
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8141629 |
Well string centralizer and method of forming
Centralizers including at least a portion formed of a first material and at least one end band secured to the first material and formed of a second material. The end band being installed to resist...
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8074712 |
Stop collar friction clamping device
A stop collar assembly used for axially securing and/or to resist axial sliding of a downhole tool device. The assembly provided on a housing of the downhole tool and includes a generally annular...
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8066066 |
Borehole casing centraliser
A centraliser segment (11) comprising a first collar portion(15), a second collar portion (17) and bow element (19) extending between said first collar portion and said second collar portion to...
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8011429 |
Transport assembly
A transport assembly configured to be attached to downhole apparatus has a support assembly configured to be attached to the downhole apparatus and a ground engaging assembly, which may be a roller...
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7954567 |
Adjustable winged centering tool for use in pipes with varying diameter
An adjustable centering tool for use in pipes of varying inner diameter. The centering tool being provided with a number of identical and steplessly adjustable, radially protruding wings having...
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7954566 |
Stabilizer for drill strings
Apparatus and methods for using the drilling apparatus to increase the linear direction of the drilling action are described. The drilling apparatus contains a drill rod that is fitted with a...
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7946359 |
Methods and apparatus for well construction
A method of constructing a borehole drilled with a drilling apparatus (16), the method comprises: connecting a flexible tubular liner sleeve (22) around the outside of the drilling apparatus and...
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7918274 |
Downhole tools
There is disclosed an improved tool, e.g. adapted to comprise at least part of a well completion assembly or well drilling assembly. The invention provides an improved downhole tool (or device)...
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7878241 |
Expandable centralizer for expandable pipe string
A close-tolerance expandable bow spring centralizer 8 having a first expandable collar 10A coupled to and spaced apart from a second expandable collar 10B through a plurality of bow springs 30...
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7857078 |
Cutting tools and methods of making the same
A cutting tool includes a mandrel; a matrix affixed to the mandrel; and cutting material disposed within the matrix and method of making the same.
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7798253 |
Method and apparatus for controlling precession in a drilling assembly
Drilling apparatuses and methods for limiting precession are provided. According to one embodiment, a drilling apparatus includes a non-rotating stabilizer. The non-rotating stabilizer includes a...
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7793717 |
Progressive cavity pump rod guide
A rod guide is provided for use in a rotating rod string (12) for powering a progressive cavity pump (14) for pumping downhole fluids through tubing (16) to the surface. The rod guide includes a...
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7681665 |
Downhole hydraulic control system
A purely mechanical hydraulic control system includes at least one drilling fluid chamber and a hydraulic fluid chamber. A system pressure spring is deployed in one of the drilling fluid chamber(s)...
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7654345 |
Wear resistant sub assembly
A wear resistant sub assembly with a sleeve with a sleeve outer diameter larger than the body outer diameter, a plurality of offset indentations formed on the outer side of the sleeve formed in...
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7654341 |
Drill stem coupling and method for a directional drill
A drill stem connection assembly includes a first drill stem section and a second drill stem section. At least one engaging feature is located at an end of the first drill stem section. At least...
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7650952 |
Passive vertical drilling motor stabilization
A drilling stabilization system includes a power section coupled to an upper end of a transmission housing, a bearing housing coupled to a lower end of the transmission housing, and a drill bit...
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7624798 |
Centralizer for expandable tubulars
A multi part centralizer can be secured quickly to tubular to be cemented and expanded in a deviated wellbore. The segments ratchet with respect to each other and are capable of holding the...
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7604059 |
Downhole tools
An improved centralizer is provided for centralization of tubulars such as casings, liners, production tubing, and production screens, in oil/gas wells. Such a centralizer comprises a tubular body,...
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7600587 |
Wear resistant sleeve for sub assembly
An apparatus for protecting a sub assembly inside a borehole of a well, with a sleeve having a sleeve outer diameter larger than the body outer diameter; a plurality of offset indentations formed...
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7546879 |
Flow control device
The invention relates to a device for control of the flow through a production tube placed in an oil well. The device comprising a portion of the production tube provided with through orifices and...
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7520340 |
Method of avoiding the need for a scraper run in drill out operations and a downhole drilling motor assembly
A method of avoiding the need for a scraper run in drill out operations. The method involves the single step of incorporating a rotary scraper into the downhole drilling motor assembly in such a...
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7520344 |
Wear resistant collar for sub assembly
A collar for protecting a body inside a borehole of a well, with a collar outer diameter larger than the body outer diameter, a plurality of offset indentations formed on the outer side of the...
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7412761 |
Method of creating a sleeve on tubing
A method and apparatus for the application of a sleeve upon a tubular, such as a pipe string, used in downhole applications, for example in oil and gas exploration or recovery. A mould is located...
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7409758 |
Vibration damper systems for drilling with casing
Apparatus and methods are provided for reducing drilling vibration during drilling with casing. In one embodiment, an apparatus for reducing vibration of a rotating casing includes a tubular body...
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7392861 |
Stabilizer for a rod, particularly a string of drilling rods
Stabilizer (1) designed to be slid onto a rod (2), particularly a string of drilling rods. It comprises at least one elastic part (4) that can deform when the stabilizer (1) is held in an initial...
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7389831 |
Dual-member auger boring system
A system for boring horizontal boreholes and installing products using a dual member drill string. The system is comprised of a boring machine with a frame and a rotary drive supported on the...
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7357178 |
In and relating to downhole tools
An improved centralizer is provided for centralization of tubulars such as casings, liners, production tubing, and production screens, in oil/gas wells. Such a centralizer comprises a tubular body,...
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7347286 |
Drill string valve assembly
A drill string valve assembly includes a tubular valve body, including an outer surface and an inner bore for housing a valve mechanism to control fluid flow through the bore; and an axial load...
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7320363 |
Energized slip ring assembly
A slip ring assembly including a slip ring and an electrical contact assembly. The slip ring defines a circumference and an electrical contact groove extending around the circumference of the slip...
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7308955 |
Stabilizer arrangement
A stabilizer comprises a body having first and second ends, each of which is formed with a respective connector means, the body having an outer wall upon which is formed a plurality of the...
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7299886 |
Stabilized down hole drilling motor
A down hole drilling motor includes a stator housing having an exterior surface, an upper end, a lower end, an upper vane mounting region at the upper end and lower vane mounting region at the...
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7182161 |
Drill string tool with bearing sleeve
A drill string tool such as a drill string stabilizer (1) comprises a circumferentially continuous bearing sleeve (6) having an outside diameter which is equal to or greater than the outside...
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7172025 |
System for lining a section of a wellbore
A system for lining a section of a wellbore with an expandable tubular element is provided. The system includes an elongate string extending into the wellbore, the string being provided with the...
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7143825 |
Expandable wellbore stabiliser
A stabiliser is disclosed for stabilising a radially expandable tubular element extending in a wellbore drilled into an earth formation. The stabiliser comprises a radially expandable tubular...
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7140431 |
Centraliser for an expandable tubular element in a wellbore
A centralizer is disclosed for stabilizing a radially expandable tubular element extending in a wellbore drilled into an earth formation. The centralizer has a tubular member selected from a...
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7128170 |
Adjustable stabiliser for directional drilling
A stabiliser (10) has a body (12) having a through-bore (16). A mandrel (14), also having a through-bore (20), is axially slidable in the body bore to actuate and de-actuate the tool. A step (64)...
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7124825 |
Casing wear band and method of attachment
A crimpable wear band (105) tool has been invented for installation on casing (6), used in well bore drilling. A wear band (105) is provided having a cylindrical body which when coaxially placed...
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7082997 |
Pipe centralizer and method of attachment
A crimpable centralizer has been invented for installation on pipe, such as would be useful in well bore drilling and casing operations. The present invention provides a centralizer having a...
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7055631 |
Drill pipe protector
A drill pipe protector having a tubular sleeve that is attached to a section of drill pipe and resides over the outer diameter of the drill pipe while moving within an associated well casing or...
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7004266 |
Adjustable downhole tool
An adjustable down-hole tool, for example a drill-string stabiliser (10), comprises a body (12) having a through bore (16). A mandrel (18) is rotationally fixed but axially movable in the body, the...
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6997254 |
Method of making a centering device and centering device formed by that method
A spring centralizer device for supporting a tubular member spaced from the wall of a bore is made from a single piece of boron steel material. The spring centralizer device has first and second...
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6997811 |
Sealed flexible motor coupling
A hermetic seal functions as a closure between opposite ends of the coupling by combining a metal sleeve and an elastomer sleeve extension. The metal sleeve is sealingly attached to the outer...
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6957708 |
Electrical imaging in conductive and non-conductive mud
The invention is a method and apparatus for determining an electrical property a formation surrounding a borehole with a measuring-while-drilling device. The apparatus an antenna configuration...
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6907944 |
Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool
A tool is presented for making density measurements of a formation surrounding a wellbore, comprising a collar housing in a drill string. The housing has at least one first section with a first...
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6892832 |
Breakable washer earth boring bit
A drill bit is assembled to the makeup end of a drill string by means of a breakable washer comprising a ring-shaped body having an inner diameter and an outer diameter. A radially extending first...
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6845816 |
ADI centralizer
A centralizer for use in centralizing casing or other tubulars such as tubulars in an oil or gas well comprising an annular body with a bore extending through the body and one or more blades, the...
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6769499 |
Drilling direction control device
A drilling shaft deflection assembly for a drilling direction control device of the type comprising a rotatable drilling shaft and a housing for supporting a length of the drilling shaft for...
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6722453 |
Stabilized downhole drilling motor
A downhole drilling motor comprises a housing including an integral stabilizing configuration. The stabilizing configuration may include a number of ribs which project from the surface of the...
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6708785 |
Fluid controlled adjustable down-hole tool
An adjustable down-hole tool, for example a drill-string stabiliser (10), comprises a body (12) having a through bore (16). A mandrel (18) is rotationally fixed but axially movable in the body, the...
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