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7387167 |
Insulating device and assembly
There is disclosed an electrically insulating device in the form of a sleeve ( 12 ) for a downhole tool, for electrically insulating a first threaded electrically conductive member in the form of...
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7350590 |
Instrumentation for a downhole deployment valve
The present generally relates to apparatus and methods for instrumentation associated with a downhole deployment valve or a separate instrumentation sub. In one aspect, a DDV in a casing string is...
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7255173 |
Instrumentation for a downhole deployment valve
The present generally relates to apparatus and methods for instrumentation associated with a downhole deployment valve or a separate instrumentation sub. In one aspect, a DDV in a casing string is...
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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...
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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...
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7219729 |
Permanent downhole deployment of optical sensors
The present invention involves methods and apparatus for permanent downhole deployment of optical sensors. Specifically, optical sensors may be permanently deployed within a wellbore using a casing...
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7178600 |
Apparatus and methods for utilizing a downhole deployment valve
Methods and apparatus for utilizing a downhole deployment valve (DDV) to isolate a pressure in a portion of a bore are disclosed. Any combination of fail safe features may be used with or...
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7163065 |
Combined telemetry system and method
Telemetry systems and methods are disclosed for real time communication of information between multiple positions in a wellbore.
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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...
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7084782 |
Drill string telemetry system and method
A telemetry system and method for communicating information axially along a drill string comprised of a drive train supported within a housing. The system includes an axial conducting loop formed...
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7080699 |
Wellbore communication system
A gap collar for an electromagnetic communication unit of a downhole tool positioned in a wellbore is provided. The downhole tool communicates with a surface unit via an electromagnetic field...
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6970398 |
Pressure pulse generator for downhole tool
A pressure pulse generator for a downhole drilling tool is provided. The pressure pulse generator includes a stator with an orifice through which a stream of fluid passes, and a rotor intended to...
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6816053 |
Circuit to mitigate transformer shorted turn
A dual transformer design, each transformer having at least a primary winding and a secondary winding disposed on a core means, wherein the core means is circumferentially disposed about an inner...
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EP1434063A2 |
Drill string telemetry system and method
A telemetry system and method for communicating information axially along a drill string (20) comprised of a drive train (78) supported within a housing (80). The system includes an axial...
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6750783 |
Low frequency electromagnetic telemetry system employing high cardinality phase shift keying
A downhole electromagnetic telemetry system with an increased data rate is provided. In one embodiment, a PSK data transmission system is used to transmit data in a downhole electromagnetic...
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6531871 |
Extension assembly for an electromagnetic antenna and method of connection
An electromagnetic antenna extension assembly for connection downhole into a pipe string between a data transmission unit and an electromagnetic antenna. Further, a method for connecting the data...
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6515592 |
Power and signal transmission using insulated conduit for permanent downhole installations
An apparatus and method is presented for establishing electrical connection to permanent downhole oilfield installations using an electrically insulated conducting casing. Current is caused to flow...
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EP0681090B1 |
Measurement while drilling tool
Abstract of EP0681090 An integrated modulator and turbine-generator includes a turbine impeller which is directly coupled by a drive shaft to a modulator rotor downstream from the impeller. The...
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6396276 |
Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring
An apparatus for borehole electric-field telemetry that comprises a source of modulated voltage or current, at least one axially non-conductive collar connected between pipe sections in a pipe...
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6392561 |
Short hop telemetry system and method
The invention relates to a data transmission or telemetry system and a method for communicating information axially along a drill string. The method includes the step of conducting an axial...
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6249259 |
Downhole magnetic dipole antenna
A downhole magnetic hollow core dipole antenna has a high permeability material magnetic core composed of laminated sections placed around a section of drill pipe and running substantially along...
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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...
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6188223 |
Electric field borehole telemetry
An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar collar connected between pipe sections in a pipe string,...
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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...
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6160492 |
Through formation electromagnetic telemetry system and method for use of the same
An electromagnetic telemetry system for changing the operational state of a downhole device (84) disclose. The system comprises an electromagnetic transmitter (76) disposed in a first wellbore (30)...
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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...
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EP1035299A2 |
Combined electric-field telemetry and formation evaluation method and apparatus
An apparatus for borehole electric-field telemetry that comprises a source of modulated voltage or current, at least one axially non-conductive collar connected between pipe sections in a pipe...
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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...
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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,...
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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...
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EP0940557A2 |
Electrically insulating gap subassembly
An electrically insulating gap subassembly for inclusion in a pipe string (30). The subassembly comprises: a first tubular member (90) having a threaded end connector; a second tubular member (98)...
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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...
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5883516 |
Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring
An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar connected between pipe sections in a pipe string, and a...
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5531270 |
Downhole flow control in multiple wells
Remotely controllable fluid flow control valves are disposed in the main wellbore and branch wellbores of a multiple well. Each flow control valve has a radio frequency range receiver, a controller...
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5517464 |
Integrated modulator and turbine-generator for a measurement while drilling tool
An integrated modulator and turbine-generator includes a turbine impeller which is directly coupled by a drive shaft to a modulator rotor downstream from the impeller. The modulator rotor is...
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5512889 |
Downhole instruments for well operations
Pressure and temperature signals are transmitted between a predetermined point in a wellbore and the earth's surface by an electromagnetic wave transmitter disposed in the well and connected to a...
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EP0681090A2 |
Measurement while drilling tool.
An integrated modulator and turbine-generator includes a turbine impeller which is directly coupled by a drive shaft to a modulator rotor downstream from the impeller. The modulator rotor is...
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5270703 |
Bipolar signal amplification or generation
Amplification or generation of very low (and variable) frequency, low voltage, high current bipolar signals useful in electrical borehole telemetry systems is achieved using a duty cycle control...
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5236048 |
Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein
An electric coupling for two electric circuits in a well includes an electric contact and a contact receiver connected to respective ones of the circuits so that a contact/receiver pair is formed...
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5187473 |
Bipolar signal amplification or generation
Amplification or generation of very low (and variable) frequency, low voltage, high current bipolar signals useful in electrical borehole telemetry systems is achieved using a duty cycle control...
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5160925 |
Short hop communication link for downhole MWD system
The short hop communication link includes a sensor module positioned downhole from a motor in a well. The module includes sensors that monitor operational, directional and environmental parameters...
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5138313 |
Electrically insulative gap sub assembly for tubular goods
An electrically insulative gap sub for inclusion in a drill string that consists of upper and lower threaded joint members, an inner sleeve connected to extend axially from the upper joint member,...
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5130706 |
Direct switching modulation for electromagnetic borehole telemetry
An apparatus for borehole electromagnetic telemetry is provided comprising a direct switching element to couple energy from a downhole energy source to the earth-drillstring system, a downhole...
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5091725 |
Well logging tool and system having a switched mode power amplifier
A logging tool (22) for use in measuring underground parameters and transmitting electromagnetic energy (38) through the lithosphere (16) is disclosed. The logging tool (22) includes a...
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4980682 |
Method of reducing noise in a borehole electromagnetic telemetry system
A borehole telemetry system has a transmitter located in the borehole, a surface receiver, and surface signal sensors for receiving the transmitted signal. There are usually plural sources of...
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EP0339825A1 |
Apparatus for data transmission in a borehole.
Apparatus in which a boring tool (12) is urged through the ground by means of a drill string (14) in order to form an underground hole (18) includes an arrangement for obtaining certain information...
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4839644 |
System and method for communicating signals in a cased borehole having tubing
A system and method are disclosed for wireless two-way communication in a cased borehole having tubing extending therethrough. A downhole communications subsystem is mounted on the tubing. The...
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