Matches 1 - 50 out of 53 1 2 >
Match Document Document Title
7347283 Using a rotating inner member to drive a tool in a hollow outer member  
A rotating inner member is used to drive a downhole tool housed within the hollow outer member of a dual-member drill string. The downhole tool preferably will be adapted to receive rotational...
7313480 Integrated drilling dynamics system  
A method and apparatus for controlling a drilling operation involving the rotation of a bottom-hole assembly carried by a drillstring. In one embodiment, an integrated, closed-loop rigsite analysis...
7280432 Oscillating shear valve for mud pulse telemetry  
An oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor...
7254486 Method and apparatus for shale bed detection in deviated and horizontal wellbores  
A relative dip angle of a deviated borehole is determined from natural gamma ray measurements. Dip corrected measurements are processed to determine the thickness of thin beds, and the peak gamma...
7252160 Electromagnetic gap sub assembly  
A compact, robust, wear resistant, and high performance electrically insulating gap sub for use with borehole EM Telemetry is disclosed. In one embodiment, the gap sub may include an externally...
7249636 System and method for communicating along a wellbore  
A system and method is provided for communicating with a device disposed in a wellbore. Signals are communicated between a surface location and the device via a hardwired section of wellbore and a...
7243028 Methods and apparatus for reducing electromagnetic signal noise  
The present invention generally provides methods and apparatus for reducing noise in a detected electromagnetic wave used to telemeter data during a wellbore operation. In one embodiment, two...
7201239 Power-generating device for use in drilling operations  
A preferred embodiment of a power-generating device for use in drilling operations comprises a turbine comprising a housing, and a rotor assembly rotatably coupled to the housing so that the rotor...
7182151 Apparatus and method for horizontal drilling  
An apparatus and method for horizontally drilling for detecting subsurface features and avoiding such features during closed-loop control of an underground drilling machine. A horizontal drilling...
7147066 Steerable drilling system and method  
A bottom hole assembly 10 for drilling a deviated borehole includes a positive displacement motor (PDM) 12 or a rotary steerable device (RSD) 110 having a substantially uniform diameter motor...
7111675 Remote closed system hydraulic actuator system  
A hydraulic actuator system includes a power source, a controller in communication with the power source, a piezoelectric stack comprising a plurality of piezoelectric elements disposed within a...
7093680 Subsurface signal transmitting apparatus  
An insulator for a subsurface signal transmitting apparatus. The insulator includes a housing, a mandrel axially disposed inside the housing, a first insulating material disposed between the...
7082078 Magnetorheological fluid controlled mud pulser  
A mud pulser controlled by a field applied to an electroactive fluid. The electroactive fluid is employed to act as a rapid-response brake to slow or interrupt the rotation of a mud motor or mud...
7025152 Using a rotating inner member to drive a tool in a hollow outer member  
A rotating inner member is used to drive a downhole tool housed within the hollow outer member of a dual-member drill string. The downhole tool preferably will be adapted to receive rotational...
6886644 Apparatus and method for horizontal drilling  
An apparatus and method for horizontally drilling provides for detecting subsurface features and avoiding such features during closed-loop control of an underground drilling machine. A horizontal...
6850068 Formation resistivity measurement sensor contained onboard a drill bit (resistivity in bit)  
A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses an electrode for injecting current into the earth formation and an...
6781130 Geosteering of solid mineral mining machines  
A rock avoidance control system for solid mineral mining using a forward looking rock/mineral interface detector and controlling the miner to cut to the detected rock/mineral interface. One or more...
6739413 Using a rotating inner member to drive a tool in a hollow outer member  
A rotating inner member is used to drive a downhole tool housed within the hollow outer member of a dual-member drill string. The downhole tool preferably will be adapted to receive rotational...
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...
6672383 Subsurface signal transmitting apparatus  
A subsurface signal transmitting apparatus including an insulation coupler, a carrier device for mounting the telemetry instrumentation, and a by-pass system for avoiding pressure build-up either...
6626253 Oscillating shear valve for mud pulse telemetry  
An anti-plugging oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow...
6594881 Bit torque limiting device  
A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and...
6581699 Steerable drilling system and method  
A bottom hole assembly 10 for drilling a deviated borehole includes a positive displacement motor (PDM) 12 or a rotary steerable device (RSD) 110 having a substantially uniform diameter motor...
6527512 Mud motor  
A fluid powered drilling motor adapted for drilling oil wells and other subterranean bore holes. The motor having a rotor and a stator wherein the iron content of the whole motor is less than 0.1%...
6469635 Bore hole transmission system using impedance modulation  
A data transmission system for use in extracting data from a downhole location in a well is disclosed. The well has electrically conductive downhole structure ( 2 ,C) which together with an earth...
6464022 Mobile horizontal directional boring apparatus and method for use in boring from existing utility manholes  
A mobile, horizontal directional boring apparatus and method is provided for boring from an existing utility manhole for the placement of small diameter fiber optic cabling. A mobile platform is...
6405808 Method for increasing the efficiency of drilling a wellbore, improving the accuracy of its borehole trajectory and reducing the corresponding computed ellise of uncertainty  
A well survey process for combining highly accurate well survey data with lower quality survey data in such manner that survey determination of overall borehole trajectory is improved. The...
6405795 Subsurface signal transmitting apparatus  
The subsurface signal transmitting apparatus ( 10 ) including an insulation coupler ( 11 ), a carrier device ( 12 ) for mounting the telemetry instrumentation ( 75 ), and a by-pass system for...
6357538 Bit torque limiting device  
A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and...
6325163 Bit torque limiting device  
A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and...
EP1143105A1 Directional drilling system  
A system is provided for directionally drilling a wellbore using a drill string having a mud motor, a drill bit, and a drive shaft for transmitting torque from the mud motor to the drill bit. The...
6296056 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production  
Subsurface wellbore conditions are measured directly in the wellbore while the fluid circulation system is not pumping. The measured values are recorded at the subsurface location and subsequently...
6237404 Apparatus and method for determining a drilling mode to optimize formation evaluation measurements  
There are many natural pauses during rotary drilling operations where a portion of the drill string remains stationary. Pauses include drill pipe connections, circulating time, and fishing...
6218959 Fail safe downhole signal repeater  
A system and method of fail safe communication of information between surface equipment and downhole equipment are disclosed. The system comprises two or more repeaters (34, 35, 36) disposed within...
EP0900917B1 An apparatus and system for making at-bit measurements while drilling  
Abstract of EP0900917 The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The...
6188222 Method and apparatus for measuring resistivity of an earth formation  
The method and apparatus of the invention determines earth formation resistivity at extended depths into the formation by the use of telemetry transmission signals to measure the formation...
6182774 Bit torque limiting device  
A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and...
6177882 Electromagnetic-to-acoustic and acoustic-to-electromagnetic repeaters and methods for use of same  
A downhole communications system including an electromagnetic-to-acoustic signal repeater (35) for communicating information between surface equipment and downhole equipment and a method for use of...
6144316 Electromagnetic and acoustic repeater and method for use of same  
An electromagnetic and acoustic signal repeater (34) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (34) is disclosed. The...
6075461 Disposable electromagnetic signal repeater  
An apparatus, method and system for communicating information between downhole equipment (40) and surface equipment is disclosed. The electromagnetic signal repeater apparatus (34, 36) comprises a...
6068394 Method and apparatus for providing dynamic data during drilling  
The present disclosure is directed to both a method and apparatus for providing data dynamically during the drilling of a borehole. This invention can be used with drilling apparatus which is...
6057784 Apparatus and system for making at-bit measurements while drilling  
The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The instrumentation can be located...
6018501 Subsea repeater and method for use of the same  
A subsea repeater apparatus (48) for communicating information between surface equipment (60) and downhole equipment (44) is disclosed. The apparatus (48) comprises an electromagnetic receiver (66,...
6018301 Disposable electromagnetic signal repeater  
An apparatus, method and system for communicating information between downhole equipment (40) and surface equipment is disclosed. The electromagnetic signal repeater apparatus (34, 36) comprises a...
6006844 Method and apparatus for simultaneous coring and formation evaluation  
A core barrel having an inner tube for coring and, alternately, a center plug assembly for closing the throat of the core bit at the bottom of the assembly for drilling in lieu of coring. The inner...
5956995 Lubricant level detection system for sealed mud motor bearing assembly  
An apparatus and method for detecting lubricant reservoir levels, particularly in bearing sections for downhole mud motors, is revealed. This allows rig personnel to more exactly ascertain the...
EP0939195A2 Apparatus and method for determining a drilling mode to optimize formation evaluation measurements  
There are many natural pauses during rotary drilling operations where a portion of the drill string remains stationary. Pauses include drill pipe connections, circulating time, and fishing...
5942990 Electromagnetic signal repeater and method for use of same  
A downhole electromagnetic signal repeater (76) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (76) is disclosed. The repeater...
5924499 Acoustic data link and formation property sensor for downhole MWD system  
A system is disclosed for transmitting and receiving acoustic data signals in a well containing a drill string. The system includes devices for transmitting acoustic signals through the drill...
EP0900917A1 An apparatus and system for making at-bit measurements while drilling  
The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The instrumentation can be located...
Matches 1 - 50 out of 53 1 2 >