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7607495 |
Tractor with improved valve system
A hydraulically powered tractor includes an elongated body, two gripper assemblies, at least one pair of aft and forward propulsion cylinders and pistons, and a valve system. The valve system...
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7607497 |
Roller link toggle gripper and downhole tractor
An expandable gripper assembly may be configured for anchoring a tool in a passage. The expandable gripper assembly includes first, second, and third pivotally connected links that are coupled to a...
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7392859 |
Roller link toggle gripper and downhole tractor
An expandable gripper assembly may be configured for anchoring a tool in a passage. The expandable gripper assembly includes first, second, and third pivotally connected links that are coupled to a...
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7353886 |
Tractor with improved valve system
A hydraulically powered tractor includes an elongated body, two gripper assemblies, at least one pair of aft and forward propulsion cylinders and pistons, and a valve system. The valve system...
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7287608 |
Method and device for drilling a hole in soil or rock material and for forming an anchoring
A method and device for boring a hole in soil or rock material and for forming an anchoring are disclosed. A borehole is formed by inserting a drill bit, and tensioning elements coupled to the...
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7121364 |
Tractor with improved valve system
A hydraulically powered tractor adapted for advancement through a borehole including an elongate body, aft and forward gripper assemblies, and a valve control assembly housed within the elongate...
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7080700 |
Tractor with improved valve system
A hydraulically powered tractor includes an elongated body, two gripper assemblies, at least one pair of aft and forward propulsion cylinders and pistons, and a valve system. The valve system...
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6793444 |
Mechanical anchor
A mechanical anchor includes an anchor unit that is divided into a plurality of divided anchor units which are movably connected to a tension rod to be moved in lateral directions. The anchor unit...
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6467557 |
Long reach rotary drilling assembly
A long reach rotary drilling assembly comprises an elongated conduit extending through a bore in an underground formation, a drill bit for being rotated to drill the bore, a 3-D steering tool on...
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6431270 |
Downhole tools with a mobility device
The present invention provides a system for performing a desired operation in a wellbore. The system contains a downhole tool which includes a mobility platform that is electrically operated to...
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6210077 |
Mechanical ground anchor
A mechanical ground anchor is provided including an anchor body having a plurality of parts forming a cylindrical shape. The parts forming the cylindrical shape are mounted to be opened and closed...
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6142245 |
Extended reach drilling system
An extended reach drilling (ERD) system for drilling a borehole in an underground formation is provided. The ERD system comprises a drill bit, a motor for driving the drill bit, a drill-pipe to...
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4986374 |
Apparatus for driving an upwardly directed shaft in rock
An apparatus for driving an upwardly directed shaft in rock, which includes a platform that can be regulated in height. The platform carries a drilling unit having engageable elements enabling...
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4099584 |
Flame jet tool for drilling to great depths
A flame jet tool for drilling a hole in the ground at great depths is disclosed. The tool comprises a flame jet lance having a drill bit and an associated fuel system. The lance is disposed in a...
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3640349 |
STOPPING APPARATUS
The invention relates to an improvement in stopping apparatus permitting boreholes to be made with great accuracy and requiring little manpower attendance, said apparatus comprising a movable...
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3633685 |
DEEP WELL DRILLING APPARATUS
Apparatus for drilling deep wells in ocean beds or on dry land. The underwater drilling apparatus employs a drill driven by an electric motor which is lowered to the ocean bed by cables including...
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3396795 |
Tubing cutter
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3280923 |
Nuclear powered drilling method and system
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3185225 |
Feeding apparatus for down hole drilling device
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2999572 |
Earth anchor
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2984310 |
Rotary drill apparatus
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2955808 |
Tunneling machine having stepper type advancing means
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2893693 |
Down-hole motor positioning device
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2877822 |
Hydraulically operable reciprocating motor driven swage for restoring collapsed pipe
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2828945 |
Oil and gas well drilling and apparatus therefor
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