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Match Document Document Title
7607496 Drilling apparatus and system for drilling wells  
A device for boring a well with casing. The device is attached to a motor that has a power shaft for imparting rotational movement. The device comprises a driver operatively connected to the power...
7562725 Downhole pilot bit and reamer with maximized mud motor dimensions  
A drilling unit containing a combined pilot bit and reamer. The drilling unit includes a housing containing a mud motor and a pilot bit extending from its distal end. A reamer is mounted to the...
7552782 Thrust-bearing assembly  
Thrust-bearing assemblies, and thrust-bearing apparatuses and downhole motors incorporating such thrust-bearing assemblies are disclosed. In one aspect of the present invention, a thrust-bearing...
7549487 Mandrel and bearing assembly for downhole drilling motor  
A downhole drilling motor beating assembly includes a tubular mandrel adapted to connect to a rotational power output of downhole motor. The bearing assembly includes a mandrel having: an upper end...
7523792 Method and apparatus for shifting speeds in a fluid-actuated motor  
A method and apparatus for changing the speed of a drill bit down hole in a fluid-actuated motor, including a positive displacement motor and a hydraulic motor, is disclosed. The apparatus...
7500787 Bearing assembly for downhole mud motor  
A bearing assembly for use with a mud motor includes a two-piece mandrel and a housing. Two radial bearings and a triple stack axial thrust on-bottom bearing are disposed between the mandrel and...
7497279 Jack element adapted to rotate independent of a drill bit  
In one aspect of the present invention a downhole tool string has a rotor secured within a bore and connected to a jack element that is substantially coaxial with the rotor. A portion of the jack...
7451835 Downhole turbine  
In one aspect, a downhole assembly has a downhole tool string component with a bore adapted to accommodate drilling mud. A fluid barrier is disposed within the bore and has a cylindrical portion...
7448455 Turbodrill with asymmetric stator and rotor vanes  
A turbodrill has rotor vanes and stator vanes that are asymmetric with respect to each other. The rotor blade on which the rotor vanes are disposed has a reaction of less than about 0.5. A method...
7424922 Rotary valve for a jack hammer  
In one aspect of the present invention a tool string comprises a jack element substantially coaxial with an axis of rotation. The jack element is housed within a bore of the tool string and has a...
7416034 Drive system  
The invention relates to a drive system, in particular a downhole drilling assembly ( 10 ). In the preferred embodiment, a bearing mechanism ( 14, 24 ) of the assembly ( 10 ) is isolated from a...
7405998 Method and apparatus for generating fluid pressure pulses  
Apparatuses and methods for generating fluid pressure pulses are disclosed. An example apparatus may include a chamber that can collect fluid and an upstream ported disc coupled to a downstream end...
7389832 Hydrostatic mechanical seal with local pressurization of seal interface  
A hydrostatic mechanical seal assembly includes a locally deployed pump for pressurizing a lubricant fluid between the opposing faces of a mating ring and a sealing ring. In one exemplary...
7383898 Inner and outer motor with eccentric stabilizer  
A downhole motor arrangement for a directional drilling comprises a first motor component ( 22 ), a second motor component ( 24 ) encircling at least part of the first motor component ( 22 ), and a...
7360609 Directional drilling apparatus  
A general housing encloses a drilling motor that can be disabled to permit optimum rotary drilling practice. A mode selector responds to manipulation of the drilling fluid flow rate and permits...
7353887 Control systems and methods for active controlled bottomhole pressure systems  
An active differential pressure device (APD device) in fluid communication with a returning fluid creates a differential pressure across the device, which controls pressure below the APD Device. In...
7318489 Hydraulic motor arrangement and method of operating a hydraulic motor  
A hydraulic motor for use in subterranean drilling operations in which a drive fluid within a first reservoir is forced through the motor by a high pressure working fluid, such as drilling mud, the...
7314100 System for use in a bore hole for axially coupling a tubular end and a mandrel  
System for coupling two tubular ends for use in a well bore, the system comprising a first tubular end, a second tubular end for inserting into the first tubular end in axial alignment thereof,...
7306059 Thrust bearing assembly  
A thrust bearing assembly in which each thrust pad is individually mounted on a deflection element. An embodiment of the invention comprises a rotating bearing runner having a wear resistant face...
7306031 Tubing string rotator and method  
A tubing string rotator for rotating a tubing string in a well having a downhole pump. The tubing string rotator includes a housing having a first portion and a second portion. At least the second...
7303007 Method and apparatus for transmitting sensor response data and power through a mud motor  
Apparatus and methods for establishing electrical communication between an instrument subsection disposed below a mud motor and an electronics sonde disposed above the mud motor in a drill string...
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...
7290625 Reverse-circulation drilling method and system  
A reverse-circulation drilling method and system includes a drill bit, a drill string having drill rods, and a rotary table or power swivel for bringing the drill bit into rotation by means of the...
7243740 Filter assembly having a bypass passageway and method  
A filter assembly including a primary flow passageway having at least one filter deployed therein and a secondary flow passageway having a bypass filter deployed therein is provided. The filter...
7234545 Self-blocking safety device  
Self-blocking fishing device to be used in petroliferous well drilling tools, wherein said tools are preferably Positive Displacement Downhole Drilling Motors, Drilling mud motors, and the similar....
7226279 Gerotor mechanism for a screw hydraulic machine  
The invention relates to gerotor mechanisms for screw downhole motors used for drilling oil and gas wells, to screw pumps for producing oil and pumping fluids and to general purpose screw motors....
7225889 Downhole motor locking assembly and method  
A lockable motor assembly for use in a well bore comprises a stator, a rotor rotatably mounted within the stator, and a selectively removable flow restriction means. The lockable motor assembly may...
7222682 Chain drive system  
A downhole tractor is provided that includes a motor, at least one rotatable screw powered by the motor, and a chain engageable with the at least one rotatable screw, whereby rotation of the at...
7204326 Drilling turbine  
A turbine is disclosed which includes a turbine blade housing having an inner facing portion of a first material having a first coefficient of expansion, and a turbine blade body having an outer...
7201238 Low friction face sealed reaction turbine rotors  
Rotary jetting tool including a rotor with axially-opposed pressure-balanced mechanical face seals. Vented upper mechanical face seal enables the rotor to be operated with the relativity low...
7188685 Hybrid rotary steerable system  
A bottom hole assembly is rotatably adapted for drilling directional boreholes into an earthen formation. It has an upper stabilizer mounted to a collar, and a rotary steerable system. The rotary...
7182157 Enlarging well bores having tubing therein  
An underreamer for forming a cavity within a well bore includes a fluid motor having a first body and a second body arranged about a longitudinal axis. The first body is adapted to rotate about the...
7178611 System and method for directional drilling utilizing clutch assembly  
According to one embodiment of the invention, a system for directional drilling within a wellbore includes a drill string having an upper portion, a lower portion, a bent motor coupled to the lower...
7172039 Down-hole vane motor  
The present invention generally relates to an apparatus and method for use in a wellbore. In one aspect, a downhole tool for use in a wellbore is provided. The downhole tool includes a housing...
7168510 Electrical transmission apparatus through rotating tubular members  
The present invention provides an apparatus for the communication of power or data signals across the rotating gap of two tubular members, such as the stator and rotor of a mud motor, and between...
7152698 Downhole motor locking assembly and method  
A lockable motor assembly for use in a well bore comprises a stator, a rotor rotatably mounted within the stator, and a selectively removable flow restriction means. The lockable motor assembly may...
7114581 Active controlled bottomhole pressure system & method  
A wellbore drilling system has an umbilical that carries a drill bit in a wellbore. Drilling fluid pumped into the umbilical discharges at the drill bit bottom and returns through an annulus...
7086486 Flow control valve and method of controlling rotation in a downhole tool  
A flow control valve is disclosed for controlling the rotation of a hydraulic motor, such as a turbine, a mud motor, for example, having an element that rotates in response to power fluid. The...
7083008 Apparatus and method for pressure-compensated telemetry and power generation in a borehole  
An apparatus and related method are useful for compensating the pressure of drilling fluid in a drill collar disposed in a borehole. The apparatus includes a stator adapted for being secured within...
7063175 Method and apparatus for retaining a down-hole fluid motor and bit assembly  
A retaining apparatus is provided for preventing the separation and loss of a down-hole drive motor and associated drill bit from the drill string due to gyroscopic precession of the motor housing...
7055629 Inverted motor for drilling rocks, soils and man-made materials and for re-entry and cleanout of existing wellbores and pipes  
An inverted motor with a drilling utensil attached to or integrated as part of an outer motor housing that rotates around a fixed non-rotating shaft or tube. The non-rotating shaft or tube is...
6962214 Rotary seal for directional drilling tools  
A rotary valve assembly for a rotary steerable tool is disclosed for directing flow of an abrasive laden drilling fluid; the valve assembly has a first sealing surface rotatably engaging a second...
6962213 Sleeve piston fluid motor  
The present invention is a cylindrical linear fluid motor comprising a plurality of reciprocating rotary piston sleeve intermediate an inner coaxial hollow drive shaft and an outer coaxial...
6854953 Speed governor  
The present invention provides a speed governor ( 5 ) suitable for use in a fluid driven down-hole tool ( 3 ). The speed governor comprises an actuator ( 7 ) operatively coupled to a motive fluid...
6839989 Drilling apparatus for hard ground  
The invention provides apparatus for drilling trenches in the ground, the apparatus comprising a frame and a drilling assembly having a horizontal support plate connected to the bottom end of the...
6796390 Method and device for moving a tube in a borehole in the ground  
A tube ( 1 ) in a borehole ( 2 ) in the ground ( 3 ) is displaced. The tube is simultaneously displaced along and about its axis, such that it is axially introduced into or retracted from the...
6761231 Rotary driven drilling hammer  
A percussive tool adapted to receive rotational energy from the inner member of a dual-member drill string. In a preferred embodiment the percussive tool has a hydraulic pump, driven by a drive...
6742605 Percussion tool for generic downhole fluid motors  
Apparatus for an improved method for drilling earthen boreholes with a fluid powered rotary motor mounted on the downhole end of a non-rotating, fluid conducting drill string has a fluid powered,...
6705411 Downhole coring device  
The invention relates to a downhole rotary coring device placeable in a drill string and comprising a head section, a motor, and a core barrel having an outer motor comprising a rotor connected to...
6672409 Downhole generator for horizontal directional drilling  
A generator assembly for generating power in the downhole end of a drill string used to form a borehole in horizontal directional drilling. The drill string provides a fluid passageway in which the...
Matches 1 - 50 out of 436 1 2 3 4 5 6 7 8 9 >