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7624808 |
Expandable ramp gripper
A gripper for use in a downhole tool is provided. The gripper can include an actuator, a toe assembly, and an expandable assembly. The toe assembly can be a leaf-spring like elongate continuous...
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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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7604060 |
Gripper assembly for downhole tools
A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible...
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7493967 |
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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7401665 |
Apparatus and method for drilling a branch borehole from an oil well
A wireline drill train is used to drill an elongated, small diameter, lateral branch borehole from near the base of a main well. The drill train, includes a drill module, a first self-propelled...
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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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7353890 |
Down-the-hole hammer and components for a down-the-hole hammer, and a method of assembling a down-the-hole hammer
A down-the-hole hammer includes a casing and a piston movable in the casing between a lowermost operating position and an uppermost operating position. A recess is provided between the piston and...
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7306058 |
Anti-rotation device for a steerable rotary drilling device
In a drilling apparatus of the type comprising a rotatable drilling shaft and a housing for rotatably supporting a length of the drilling shaft for rotation therein, a rotation restraining device...
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7293615 |
Earth boring system
An earth boring apparatus for sinking shafts and removing shaft material from the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one...
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7287605 |
Steerable drilling apparatus having a differential displacement side-force exerting mechanism
An apparatus for steerable rotary drilling of a borehole having a wall in the earth comprising a mandrel having a central opening there through for the passage of drilling fluids. The mandrel...
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7275593 |
Gripper assembly for downhole tools
A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible...
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7273109 |
Puller-thruster downhole tool
A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner...
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7143843 |
Traction control for downhole tractor
Apparatus, system and methods useful for controlling the traction of a downhole tractor in a borehole include the capability of repeatedly adjusting the normal force applied to at least one...
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7090037 |
Device for anchoring a drill string in a borehole
A device for anchoring a drill string in a borehole an anchoring member connected to the drill string, the anchoring member being movable between a retracted position in which the anchoring member...
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7080701 |
Electrically sequenced tractor
A downhole drilling tractor for moving within a borehole comprises a tractor body, two packerfeet, two aft propulsion cylinders, and two forward propulsion cylinders. The body comprises aft and...
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7048047 |
Gripper assembly for downhole tools
A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor within the passage. The gripper assembly includes an elongated mandrel and flexible...
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6978844 |
Filling and circulating apparatus for subsurface exploration
A disclosure is provided describing a filling and circulating tool and method of use. The filling and circulating tool comprises a tubular housing having a first fluid passage and a longitudinal...
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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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6955232 |
Equipment for drilling vertical boreholes
The invention relates to equipment for drilling a vertical borehole in hard ground, the equipment comprising:
casing put successively into place in the borehole; a drilling machine having a...
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6953086 |
Bi-directional traction apparatus
A traction apparatus ( 1 ) for propulsion along a bore comprises first and second traction members ( 6 ) having outwardly extending legs ( 14 ). A propulsion system for operating the traction...
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6926102 |
Subsea controlled milling
Subsea controlled milling apparatus and methods. In a described embodiment, a method of controlling displacement of a cutting device conveyed on a tubular string in a subterranean well includes the...
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6910533 |
Mechanism that assists tractoring on uniform and non-uniform surfaces
A six-bar linkage mechanism for conforming to the configuration of a tractored surface having a central link defined by a tool body and a saddle link spaced from the central link and movable for...
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6840337 |
Method and apparatus for removing cuttings
An apparatus and method for removing cuttings in a deviated borehole using drilling fluids. The apparatus includes a pipe string and a bottom hole assembly having a down hole motor and bit for...
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6796380 |
High expansion anchor system
An anchor system for high expansion applications is described. It features a gripping member that holds together a pair of links. The movement of the links is regulated to assure the gripping...
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6722442 |
Subsurface apparatus
A subsurface apparatus in the form a tractor is adapted for travel through a bore containing a moving fluid stream. The tractor comprises a body, a drive arrangement for moving the body in a...
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6715559 |
Gripper assembly for downhole tractors
A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor within the passage. The gripper assembly includes an elongated mandrel and flexible...
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6698976 |
Grouting pipe equipment and method of grouting using the same for an underground water well
Grouting equipment and methods suitable for use in underground water wells, which accomplish their goals by better centering the grouting equipment within a bore hole, even in curved bore holes, in...
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6668924 |
Reduced contamination sampling
A downhole sampling tool and related method are provided. The tool is provided with a main flowline for communicating fluid from the formation through the tool. A main valve is positioned in the...
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6467544 |
Sample chamber with dead volume flushing
A sample module for use in a downhole tool includes a sample chamber for receiving and storing pressurized fluid. A piston is slidably disposed in the chamber to define a sample cavity and a buffer...
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6427786 |
Electro-hydraulically controlled tractor
A tractor for moving within a borehole comprises an elongated tractor body and two propulsion assemblies that are longitudinally movably engaged with the body. The tractor body has annular pistons...
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6089323 |
Tractor system
A tractor system has been invented which, in certain embodiments, includes a body connected to the item, first setting means on the body for selectively and releasably anchoring the system in a...
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6082461 |
Bore tractor system
A tractor system for moving an item through a wellbore has been invented with a central mandrel interconnected with the item, first setting means about the central mandrel for selectively and...
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5836089 |
Excavating equipment fitted with surface clamps
Excavating equipment comprising a rigid support structure with articulately mounted surface clamps, an excavating device downstream of the surface clamps in a direction of excavation and an urging...
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5794703 |
Wellbore tractor and method of moving an item through a wellbore
A new wellbore tractor system has been invented which, in one aspect has at least two slip units for alternately and releasably anchoring the system within a wellbore or within a tubular member and...
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5758731 |
Method and apparatus for advancing tethers
A tether puller for advancing a tether through a channel may include a bellows assembly having a leading end fixedly attached to the tether at a first position and a trailing end fixedly attached...
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5758730 |
Method for removing an earth core out of a pipe laid in trench-less manner and go-devil for implementing the method
A go-devil (1) is inserted into a pipe end of a pipe (5) laid in place in trenchless manner by ramming or pressing and of which the earth core (7) shall be removed by a method of the invention,...
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5617927 |
Sidewall rotary coring tool
A sidewall coring tool for wireline use in an earth bore hole is provided which includes an elongated tool body adapted for suspension within the bore hole by the wireline cable at a selected...
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5613568 |
Rock drilling machine
A rock drilling machine of the self-feeding, integrated type which is designed to operate in situ in a drill hole. The rock drilling machine comprises a drive unit (1), an anchoring unit (2), and a...
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5475187 |
String of sondes
A string of sondes is designed to be lowered down a borehole by means of a cable in order to detect the arrival of seismic waves therein, the sondes including retractable anchor means that are...
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5316094 |
Well orienting tool and/or thruster
An orientation mandrel rotatable in an orientation body for providing rotational orientation and actuated by a hydraulic piston controlling the position of a helix. A thruster may be connected to...
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5248896 |
Power generation from a multi-lobed drilling motor
A power generation unit associated with a downhole drilling motor capable of producing sufficient rotational speeds to produce power for operating downhole devices associated with the drilling...
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5186264 |
Device for guiding a drilling tool into a well and for exerting thereon a hydraulic force
A device for guiding a drilling tool into a well and for exerting a hydraulic force on the drilling tool includes a tubular body and an outer sleeve rotating about the body and longitudinally...
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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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4957175 |
Soil drilling equipment
For the drilling of bore holes there is provided an assembly of drilling machine elements which are positioned on top of each other and which include a gripping body comprising of two or more...
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4742876 |
Submarine drilling device
A device for submarine foundation drilling includes: a drilling unit including a head and body interconnected by at least one cylinder, the body being equipped with at least one cutter, the...
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4732226 |
Drilling machine
A shaft drilling machine comprises a drill head carrying drill tools thereon, a device for guiding the drill head in a shaft, a device for advancing the drill head in the shaft, and drive...
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4686653 |
Method and device for making geophysical measurements within a wellbore
A method and device for making geophysical measurements in a wellbore comprising a measuring string of a plurality of measuring tools displaced along a borehole wall connected to a surface control...
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4646853 |
Shaft boring machine and method
A shaft boring machine including a rotatable cutterwheel assembly with a horizontal axis mounted on a carriage having vertical travel. The carriage is mounted on a slewing base frame and rotates...
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4558751 |
Apparatus for transporting equipment through a conduit
Apparatus 10 for propelling equipment through a fluid-filled conduit 12, such as a pipeline or oil well tubular. The propulsion apparatus incorporates first and second elements 14,16 adapted to be...
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4526242 |
Drilling device
A drilling device which can be lowered in a drill hole consists of a drive device, a drill which is rotated by this drive device and a clamping device formed as a unit which can be engaged with the...
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