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7464770 |
Aspects of this invention include a steering tool having a controller configured to provide closed-loop control of hydraulic fluid pressure. In one exemplary embodiment, closed-loop control of a system (reservoir) pressure may be provide...
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7426965 |
The invention discloses a fluid-driven impactor, a power transmission mechanism for the impactor and the use of the impactor. In the prior art, the working life of the impactor is short, since a rubber primary seal and an upper fluid-div...
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7353890 |
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 the casing so that the piston and the cas...
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7299886 |
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 lower end. An upper mounting sleeve engages ...
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7040420 |
The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions....
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6955231 |
A tool adapted for changing the direction of drilling during drilling. The drilling equipment used in the drilling includes a drill string, a bent sub, a drill motor, and a drill bit. The tool is positioned between the drill string and t...
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6863137 |
A drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite umbilical having a fluid impermeable lin...
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6814165 |
Method and apparatus for underground drilling and enlarging of holes, in particular in hard rock, by using a water-driven motor as drive unit.
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6607607 |
Method and apparatus for substantially cleaning fill from a borehole, variously including in preferred embodiments disturbing, particulate solids of fill while RIH, entraining particulates while POOH, jetting downhole while RIH and jetti...
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6424066 |
An electric submergible pumping system having a submergible electric motor with a unique rotor bearing system to promote longevity of the motor. The system includes an electric motor having a housing and a stator mounted within the housi...
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6315063 |
An improved downhole fluid pressure powered reciprocating rotary drilling motor includes an automatic fluid valve means and a fluid controller that in combination provide a fluid driven periodic forcing function to excite a drill bit bot...
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6311791 |
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minim...
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6305469 |
A method of creating a wellbore in an earth formation, the wellbore including a first wellbore section and a second wellbore section penetrating a hydrocarbon fluid bearing zone of the earth formation, is provided. The method comprises d...
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6296066 |
A drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite umbilical having a fluid impermeable lin...
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6241030 |
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minim...
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6237702 |
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minim...
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6223839 |
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minim...
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6209666 |
In an air actuated down-the-hole hammer for rock drilling, a piston reciprocates within a casing to impact against a rear anvil surface of a drill bit. Upon making such impact, some fluid disposed between the impact surface and the anvil...
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6138777 |
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minim...
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5964307 |
A shock tool includes a first tubular member, a second tubular member and a third tubular member. The first tubular member has an interior bore that extends between a first end and a second end. The second tubular member has an interior ...
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5845721 |
A device for drilling a well bore is disclosed. The invention includes having a tubular string with a motor means for generating a rotative force. The device further includes an inner drilling device adapted to the motor means and an out...
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5803188 |
An hydraulically driven percussive hammer for use with down-the-hole percussive hammer drilling, the hammer having a piston and liner combination which provides for multiple stages where there are successive effective piston drive areas ...
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5526887 |
A device for drilling holes (1) in the crust of the earth, especially for drilling oil wells, wherein a rotary bit (2) is fitted in a drill string (4), within which drilling fluid is pumped downwardly and, upon return, conveys cuttings t...
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5497839 |
A drill stem arrangement and method in which the motor for providing the hammer action is in the drill stem near to the drill bit. The motor is driven by pressurised liquid and a proportion of the liquid is used for flushing drill cuttin...
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5343967 |
A device for selective straight or directional drilling in subterranean rock formations consists of a rotary drilling tool having a tool main axis and comprising a housing which comprises several sections and can be connected to a drill ...
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5307883 |
A method is specified for reversing a compressed air-driven ramming device for its control positions of forward running and rearward running in the earth, wherein, for reversal, a turning is performed against a relatively small detaining...
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5253722 |
An impact borer, a connector, a method for embedding lines and an improved method for sinking geothermal wells. The impact borer has a shell, which has a longitudinal bore. An anvil closes one end of the bore. A ram is reciprocally slide...
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5238073 |
An uphole hammer is provided comprising a substantially tubular housing which is closed at a first end and supports a substantially centrally located fluid supply tube at the first end. The fluid supply tube extends axially through the h...
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5193627 |
A forward and rearward running ramming device includes: a housing having a percussion head in which a percussion piston a axially displaced by compressed air; a control device for controlling the compressed air so that, during forward ru...
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5139096 |
A pneumatic percussion hammer for attachment to a drill tube is coaxially constructed about an outflow tube which is mounted therein for axial removal and replacement when worn. A cylindrical piston moves axially between a top sub wherei...
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5115875 |
A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High press...
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5088568 |
A hydro-mechanical device for underground drilling for use with a drilling rig comprises a container having a combustion chamber, an ignition system, inlets for introducing a fuel, an oxidizer, a liquid into the combustion chamber, a noz...
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5065826 |
A device for selective straight or directional drilling in subterranean rock formations consists of a rotary drilling tool having a tool main axis and comprising a housing which comprises several sections and can be connected to a drill ...
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4938297 |
A pressure-medium driven ram boring machine for boring in the earth, having an impact tip acted on by a percussion piston reciprocating in the machine housing, wherein the impact tip is arranged to be radially adjustable in the housing w...
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4932483 |
A down hole hammer comprises a top sub and a drill bit support supporting a drill bit separated by a tubular housing to define a piston chamber therebetween. A feed tube is mounted to the top sub and extends concentrically into the pisto...
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4923018 |
A percussion drill comprises a drill bit and a reciprocable hammer piston for imparting blows to the bit. Pressurized air is supplied to the piston for reciprocating the piston. Some of the air is by-passed to an exhaust passage and is e...
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4921056 |
A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High press...
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4917194 |
A downhole hammer is provided comprising a casing having a top sub at one end and a drill bit and support at the other end. A central tube is extended therethrough to define an annular space between the casing and the tube. A reciprocati...
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4913243 |
A percussion drill provided with additional control phases in the form of a gentle braking phase for controlling the rearward movement, and a progressive braking phase for controlling forward movement. To this end, the control slide valv...
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4886128 |
A ram boring implement having a pneumatically or hydraulically driven percussion piston, movable axially in a reciprocating manner in a housing, and an axially movable bit which is connected to an end of the housing and acted upon direct...
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4844179 |
A stabilizer sleeve (7) for a drill string, adapted to fit about a down hole motor (1) or a drill string member, is formed with an internally threaded coupling at a lower end for releasable coupling to complimentary threads (8) formed on...
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4840238 |
In a scavenger is supplied through a scavenging pipe (26) to the internal pipe string (11), the scavenging pipe (25) extending through a bore (27) of the hammer piston (17) of the hammer drill. Due to a rotary drive (14), the drilling st...
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4840237 |
A ram boring implement has a pneumatically driven percussion piston (16), which is movable in the axial direction in a reciprocating manner in a housing (12), and a control sleeve (24) which is axially adjustable for reversing the direct...
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4771835 |
A down hole hammer comprising a substantially cylindrical casing having a top sub at one end and a drill bit support at the other; a central passageway extending through the top sub, casing and drill bit support; a central tube coaxial w...
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4739842 |
A device for selective straight or directional drilling in subterranean rock formations consists of a rotary drilling tool having a tool main axis and comprising a housing which comprises several sections and can be connected to a drill ...
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4732225 |
A deep-borehole drilling device comprising a drive unit such as a downhole motor and a driven unit such as a generator in which a drive transmission coupling is provided in the form of a contact-free magnetic coupling. The magnetic coupl...
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4705119 |
An annular air-hammer apparatus for drilling holes incorporates a hollow cylindrical case with a stepped bore which has inlet and outlet ports. A rock-cutting tool with an axial opening is fitted to the case at the forward end thereof. A...
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4705118 |
Apparatus for drilling a bore hole comprising a hammer and a dual walled drill tube. The hammer comprises a reciprocable piston, fluid flow control device for directing fluid under pressure to the hammer to reciprocally drive the piston,...
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4657090 |
A bearing structure including first and second tapered bearing surfaces for accommodating on-bottom and off-bottom thrust and radial forces on a drive shaft in a down hole drilling environment and further including a radial bearing mount...
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4527641 |
In a percussion tool for rock drilling there is used in place of the conventional, large bore crown a hammer body (18) carrying a great number of interchangeable small bore crowns (26a,26b). The impact of a hammer piston (22) is transfer...
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