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7613543 |
Electronic demarcating system
A method and an electronic search system for operating an automatic device, preferably an automatic lawnmower. The system comprises at least one first electrical cable ( 1,4,5,6 ) connected to at...
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7573397 |
System and method for downhole telemetry
A system and method are provided for providing electromagnetic (EM) measurement-while-drilling (MWD) telemetry capabilities using an existing mud-pulse MWD tool. An EM tool intercepts the output...
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7540337 |
Adaptive apparatus, system and method for communicating with a downhole device
A system, apparatus and method for adaptive communication with a downhole device is disclosed. The instant invention proposes an adaptive system of communicating information from the surface of the...
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7518950 |
Method and apparatus for downlink communication
The present invention provides a method and system in which signals from the surface are sent by changing flow rate of the drilling fluid supplied to the drill string during drilling of a wellbore....
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7518528 |
Electric field communication for short range data transmission in a borehole
The present invention concerns application of a unique conductive electrode geometry used to form an efficient wideband, one- or two-way wireless data link between autonomous systems separated by...
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7489591 |
Drilling fluid pressure pulse detection using a differential transducer
An apparatus for detecting mud pulse telemetry signals includes a differential transducer. In various exemplary embodiments, a high-pressure side of the differential transducer is in fluid...
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7480207 |
Filtering and detection of telemetry
The specification discloses systems and methods that provide improved capability to detect and decode encoded telemetry data. More particularly, the specification discloses embodiments for...
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7468679 |
Method and apparatus for mud pulse telemetry
An apparatus for mud pulse telemetry for transmitting information from a drill string positioned at a down hole location in a bore hole to a surface location, the drill string having a flow passage...
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7460438 |
Downhole data communication
A data communication technique for use in producing wells. Signals are transmitted through the product (p) by varying and monitoring flow rate at respective ends of the communication channel. At...
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7453372 |
Identification of the channel frequency response using chirps and stepped frequencies
The transfer function of the communication channel in a mud pulse telemetry system is determined by sending a known signal through the channel and spectral analysis of the received signal. The...
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7430153 |
Downhole tool and method
A downhole tool for generating a fluid pressure pulse, and to a method of generating a fluid pressure pulse downhole. One example being, an improved downhole tool and method for transmitting data...
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7423931 |
Acoustic system for communication in pipelines
A system for communication in a pipe, or pipeline, or network of pipes containing a fluid. The system includes an encoding and transmitting sub-system connected to the pipe, or pipeline, or network...
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7423932 |
Well bore communication pulser
The poppet portion of a signal valve is driven rotationally by a mud motor and the rotation is used, in conjunction with a rotary-to-linear motion converter, to cause the poppet to move axially...
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7423550 |
Two sensor impedance estimation for uplink telemetry signals
Measurements made with dual sensors (flow rate or pressure) are used to attenuate pump noise in a mud pulse telemetry system.
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7417920 |
Reciprocating pulser for mud pulse telemetry
A method of transmitting pressure pulses from a downhole location through a flowing fluid in a wellbore comprises using a linear actuator to controllably move a reciprocating member axially back...
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7408837 |
Measurement while drilling tool and method
An apparatus for telemetering a downhole parameter from a well. The apparatus comprises a housing having a bore. The apparatus further comprises an annular main valve with an enlarged end...
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7400262 |
Apparatus and methods for self-powered communication and sensor network
A system for communicating between a first location and a second location comprises a jointed tubular string having a first section and a second section connected at a connection joint, with the...
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7397388 |
Borehold telemetry system
A system that is usable with a subterranean well includes an assembly and a telemetry tool. The system includes an assembly that performs a downhole measurement. The system also includes a downhole...
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7382686 |
Drilling signalling system
A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system having a housing having an inlet to admit drilling fluid to the interior of housing,...
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7345594 |
Noise attenuation apparatus for borehole telemetry
A surface mud pipeline system is described with a mechanical acoustic filter ( 1245 ) tuned to a predetermined frequency band so as to attenuate pump noise ( 132 ) within this band. The filter can...
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7330397 |
Electromagnetic anti-jam telemetry tool
A mud-pulse telemetry tool includes a tool housing, a motor disposed in the tool housing, and a magnetic coupling coupled to the motor and having an inner shaft and an outer shaft. The tool may...
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7327634 |
Rotary pulser for transmitting information to the surface from a drill string down hole in a well
A rotary pulser for transmitting information to the surface from down hole in a well by generating pressure pulses encoded to contain information. The pressure pulses travel to the surface where...
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7319638 |
Hydraulic oscillator for use in a transmitter valve
An oscillating valve driven by the pressure in a mud pulser develops a pressure variation in the mud pulse signal that is at a frequency that is different than the frequencies of the mud system....
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7313052 |
System and methods of communicating over noisy communication channels
A system and methods of transmitting information between a first location and a second location comprise transmitting a data signal and a known signal from one of the first location and the second...
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7295491 |
High impact communication and control system
A system and method in accordance with the invention communicator remotely with remotely controllable down hole tools in a well bore at a drilling installation. At the surface, high energy pressure...
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7250873 |
Downlink pulser for mud pulse telemetry
A mud pulse telemetry system comprises a surface located fluid supply line having a drilling fluid flowing therein. A non-venting pulser is disposed in the drilling fluid in the supply line, and...
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7230880 |
Rotational pulsation system and method for communicating
Disclosed herein is a rotational pulsation system including a rotor having turbine blades to drive the rotor. A centralizer having coils and a stator package positioned to operably communicate with...
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7201231 |
Apparatuses and methods for deploying logging tools and signalling in boreholes
The apparatus includes a pump for circulating pressurized fluid in a wellbore. A control device controls the pump which a conduit interconnects to the wellbore. A downhole transducer detects...
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7167101 |
Method and apparatus for telemetry
A method and related apparatus for telemetry between downhole devices and surface devices. In particular, the methods and related apparatus may send a first datum of a first parameter in an...
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7145834 |
Well bore communication pulser
The preferred pulser is a mud powered oscillator powered by the pressure variation produced across the signal valve by the unstable action. The signal valve comprises a poppet and cooperating...
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7138929 |
Method and apparatus for enhanced acoustic mud pulse telemetry during underbalanced drilling
A method and system for telemetry through a compressible drilling fluid during underbalanced drilling is disclosed. A reflector ( 110 ) is positioned downstream from the gas inlet ( 84 ) and causes...
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7133325 |
Apparatus and method for generating electrical power in a borehole
An apparatus and related method generate electrical power in a tubular housing, such as a drill collar, disposed in a borehole when drilling fluid flows through the tubular housing. The apparatus...
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7123161 |
Method and apparatus enhanced acoustic mud pulse telemetry
A method and system for telemetry through a drilling fluid during drilling is disclosed. A reflector ( 110 ) is positioned downstream from the drilling mud pumps ( 80 ) and causes reflected...
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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...
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7068182 |
Method and apparatus for mud pulse telemetry
A method and related apparatus for telemetry between downhole devices and surface devices. In particular, the methods and related apparatus may send a first datum of a first parameter in an...
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7061830 |
Transducers coated with anechoic material for use in down hole communications
A communication device is located within a well and includes a transducer that converts a first electrical signal into a first acoustic signal for transmission through the well and that converts...
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7057524 |
Pressure pulse generator for MWD
A pressure pulse generator to generate pressure signals in drilling fluid for transmission to surface includes an outer housing having an inlet and an outlet for supply to the drilling assembly; a...
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6963290 |
Data recovery for pulse telemetry using pulse position modulation
The specification discloses algorithms for error recovery in pulse position modulation-based mud pulse telemetry. More particularly, the specification discloses detection and attempted correction...
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6958703 |
Drill string enabling information to be transmitted
The present invention relates to a drill string fitted with information transmission means. The hollow rods of conductive material have their inside faces covered in an insulating material. The...
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6952170 |
Hollow drilling rod for transmitting information
The invention relates to a hollow drilling rod for transmitting information, said rod being for placing in a borehole filled with drilling mud. The rod comprises an electrically conductive...
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6920085 |
Downlink telemetry system
A downlink telemetry system providing improved apparatus and methods for communicating instructions via pressure pulses from surface equipment to a downhole assembly. The apparatus comprises a...
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6909667 |
Dual channel downhole telemetry
The present disclosure provides several methods for selecting and transmitting information from downhole using more than one channel of communication wherein data streams transmitted up each...
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6898150 |
Hydraulically balanced reciprocating pulser valve for mud pulse telemetry
A reciprocating pulser system for generating pressure fluctuations in a flowing drilling fluid comprising a reciprocating poppet and a stationary valve assembly with axial flow passages. The poppet...
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6867706 |
Frequency regulation of an oscillator for use in MWD transmission
An oscillating valve driven by the pressure in a mud pulser develops a pressure variation in the mud pulse signal that is at a frequency that is different than the frequencies of the mud system....
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6850463 |
Borehole logging apparatus for deep well drilling
The invention is directed to a borehole logging apparatus for deep well drilling, with a signal transmitter for transmitting measured data obtained while drilling from a borehole through the...
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6795373 |
Permanent downhole resonant source
A wellbore system and method for producing seismic waves in an earth formation. The system comprises a cavity containing fluid. The cavity is in a space between a wellbore tubular, which may be...
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RE38567 |
Apparatus and method for self adjusting downlink signal communication
An apparatus for sending signals downhole during drilling operations uses a main pump to pump mud from a mud pit at a substantially constant flow rate. The bulk of the pumped mud goes downhole to...
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6757218 |
Semi-passive two way borehole communication apparatus and method
The present invention provides a semi-passive two-way borehole communication system and method. The system includes a surface source signal generator for generating an acoustic signal. The acoustic...
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6741185 |
Digital signal receiver for measurement while drilling system having noise cancellation
A method is disclosed for reducing noise in a measured telemetry signal. The method includes tracking a characteristic of at least one harmonic of a noise component in the measured telemetry signal...
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6636159 |
Borehole logging apparatus for deep well drillings with a device for transmitting borehole measurement data
In a borehole logging apparatus ( 1 ) for deep well drillings having a device for transmitting measured data obtained while drilling from a borehole through the drilling fluid to the earth's...
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