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8179278 |
Downhole communication devices and methods of use
A downhole communication device comprises a first energy harvesting device; a downhole transceiver in communication with the first energy harvesting device; an accumulator in communication with the...
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8111171 |
Wellbore telemetry and noise cancellation systems and methods for the same
A method of signal processing includes providing at least a first pressure sensor and a second pressure sensor spaced in a drilling system and using an algorithm to separate the downwardly...
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8044821 |
Downhole data transmission apparatus and methods
Example wellbore telemetry systems and methods for transmitting signals between a surface unit and a downhole tool are disclosed. One example method transmits data between a downhole location in a...
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8013756 |
Estimation of properties of mud
Measurements made with at least two sensors (flow rate or pressure) during generation of a message concurrently with operation of a noise source are used to estimate a channel transfer function....
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8004421 |
Wellbore telemetry and noise cancellation systems and method for the same
A method of signal processing includes providing at least a first pressure sensor and a second pressure sensor spaced in a drilling system and using an algorithm to separate the downwardly...
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7999695 |
Surface real-time processing of downhole data
A method and apparatus for controlling oil well drilling equipment is disclosed. One or more sensors are distributed in the oil well drilling equipment. Each sensor produces a signal. A surface...
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7719439 |
Rotary pulser
An improved energy efficient intelligent rotary pulser for generating a mud pulse in a MWD (measurement while drilling) application. In the rotary pulser, a control circuit activates a brushless...
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7620394 |
Reusing frequencies of a fixed and/or mobile communications system
A communications system includes a first wireless communications system configured to provide wireless communications over a first frequency band, and a second wireless communications system...
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7439875 |
Battery conservation
Methods and apparatus for conserving battery energy used in transmitting signals carrying data from a downhole location, using a transmission system where a predetermined set of data is to be...
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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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7348893 |
Borehole communication and measurement system
A technique that is usable with a well includes using at least one downhole sensor to establish telemetry within the well. The sensor(s) are used as a permanent sensing device.
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7193525 |
Methods and apparatus for downhole inter-tool communication
A method and apparatus for communicating between downhole tools without the necessity of routing the communication through a surface module. Communications sent by downhole tools are examined and...
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7170411 |
Method of and system for rapidly locating all passive underground electronic marker types
A method of and system for rapidly locating all passive underground electronic marker types in an area under survey may locate various marker types simultaneously. In accordance with one aspect of...
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7132958 |
Downhole telemetry system using multiple uplink modes as data channels using discrete multi-tone modulation
A method and a downhole telemetry system a downhole telemetry system using discrete multitone modulation for transmitting a data stream over a plurality of transmission modes is provided. The...
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7068183 |
Drill string incorporating an acoustic telemetry system employing one or more low frequency acoustic attenuators and an associated method of transmitting data
A drill pipe forms an acoustic transmission channel for data to be transmitted from a downhole transceiver to a surface transceiver. By positioning a first low frequency acoustic attenuator between...
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7026951 |
Data telemetry system for multi-conductor wirelines
An improved data telemetry system for multi-conductor wirelines to achieve satisfactory transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two...
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6983235 |
Method and apparatus for implementing constant latency Z-domain transfer functions using processor elements of variable latency
In an illustrative embodiment, a desired signal processing transfer function is implemented using a generic pipelined data processor having variable latency followed by a variable latency...
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6898149 |
Reprogrammable downhole telemetry and control system
A reprogrammable data communications system for use in a gas or oil well borehole is disclosed. The borehole includes a casing and a piping structure therein and at least one downhole equipment...
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6823219 |
Universal optical control and management platform
An architecture for use in controlling and managing optical functions and optical devices. A common microprocessor based control layer coordinates commands between optical devices and a user...
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6819260 |
Synchronous CDMA telemetry system for use in a wellbore
A synchronous CDMA telemetry system is provided for use in a wellbore. In one described embodiment, each data bit of digital outputs of multiple downhole data sources is multiplied by an orthogonal...
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6728165 |
Acoustic sensing system for downhole seismic applications utilizing an array of fiber optic sensors
A system for sensing subterranean acoustic waves emitted from an acoustic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector,...
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6567013 |
Digital hydraulic well control system
A well control system and associated method of controlling well tools provides downhole well tool control without requiring the use of electricity or complex pressure pulse decoding mechanisms. In...
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6412025 |
Apparatus and method for automatic configuration of a personal computer system when reconnected to a network
A system and method for connecting a computer terminal (e.g., a personal computer) to a data transmission network with the appropriate settings for connection obtained from the network if the...
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6396415 |
Method and system of communicating in a subterranean well
Communicating relative to a subterranean well includes encoding information in an amplitude and a duration for a pulse. A detectable change in response to both the amplitude and duration...
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6252518 |
Communications systems in a well
A system for use with a well includes a surface device, a communications link coupled to the surface device and extending into the well, and a plurality of downhole devices coupled to different...
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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...
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6091337 |
High voltage contact monitor with built-in self tester
A sensor system for use on drilling equipment to detect the presence of high voltages during horizontal or vertical drilling and providing an alarm signal corresponding to one of three...
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5784004 |
Apparatuses and systems for reducing power consumption in remote sensing applications
The system of the subject invention includes an antenna system, a surface apparatus and a battery-powered remote apparatus useful for applications such as well bore telemetry. In well bore...
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5691712 |
Multiple wellbore tool apparatus including a plurality of microprocessor implemented wellbore tools for operating a corresponding plurality of included wellbore tools and acoustic transducers in response to stimulus signals and acoustic signals
A multiple wellbore tool apparatus consisting of a plurality of microprocessor implemented wellbore tools is disposed in a fluid filled wellbore, and an input stimulus having a predetermined...
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5689248 |
Methods for reducing power consumption in remote sensing applications
The methods of this invention reduce the amount of power consumed by a remotely positioned (i.e. downhole) sensor/transmitter used in applications such as well bore telemetry. The method involves...
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5448227 |
Method of and apparatus for making near-bit measurements while drilling
In accordance with illustrative embodiments of the present invention, a measuring-while-drilling system includes a sensor sub positioned at the lower end of a downhole motor assembly so that the...
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5365229 |
Adaptive telemetry system for hostile environment well logging
The operation of hostile environment logging tools at temperatures up to 250° C. stresses not only the tools, it also places severe demands upon the wireline telemetry due to the wide variations ...
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5363094 |
Stationary system for the active and/or passive monitoring of an underground deposit
Monitoring of an underground effluent deposit (2) and the exploration thereof are performed by installing various devices or user modules : reception arrays (Ri, Rj, Rk) such as geophones or...
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5331318 |
Communications protocol for digital telemetry system
The present invention relates to a communications protocol for a digital telemetry system which enables more efficient digital data transmission between a plurality of digital communications nodes....
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5157392 |
Telemetry network for downhole multistation seismic recording tools
A seismic logging system for VSP or cross well data capture set forth. It is comprised of M duplicate recording stations connected serially below a main structure suspended on a logging cable. Each...
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4995058 |
Wireline transmission method and apparatus
In a wireline data transmission system for passing data between downhole and surface locations in a wellbore, a system for transmitting data at a frequency above the relatively low roll of...
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4901289 |
System for acquiring and recording signals delivered by a set of sensors disposed in well probes
A system is provided for acquiring and recording signals delivered by a set of sensors disposed in one or more probes lowered into a well at the end of a multi-function cable.The different signals...
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4896152 |
Telemetry system with a sending station using recursive filter for bandwidth limiting
Before subsampling them for transmission, telemetry data are bandwidth-limited by IIR filtering at the sending station of a telemetry system. The transmitted filtered telemetry data have attendant...
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4873522 |
Method for transmitting downhole data in a reduced time
A tool face orientation of a directional drill bit within a borehole is efficiently communicated to the well surface by communicating only changes in the tool face orientation. In the first...
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4855732 |
System for the transmission of signals between a reception assembly lowered into a well and a central control and recording laboratory
A system is provided for transmitting signals between a sensor assembly contained in one or more well probes lowered into a well at the end of a cable and a surface control and recording unit. The...
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4845494 |
Method and apparatus using casing and tubing for transmitting data up a well
Method and apparatus for transmitting data uphole in a well to the top of the well. A string of electrically conductive tubing and a tool connected to the tubing are lowered down the well along the...
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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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4770034 |
Method and apparatus for data transmission in a well bore containing a conductive fluid
Method and an arrangement are disclosed for recovery of data signals representing a parameter from down hole to the top of a well bore (20a). The well bore has conductive fluid (54,60) and the data...
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4757314 |
Apparatus for the control and monitoring of a well head submerged in a liquid
The invention relates to an apparatus for the control and monitoring of a well head submerged in a liquid.The apparatus comprises electrovalve control means, an electronic system for controlling...
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4739325 |
Apparatus and method for down-hole EM telemetry while drilling
An MWD EM data/control telemetry link between down-hole instruments and ground surface instruments dynamically adapts to the underground electrical environment utilizing a down-hole microprocessor...
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4725837 |
Toroidal coupled telemetry apparatus
A downhole toroidal coupled telemetry apparatus is disclosed in which the secondary winding comprises a plurality of turns wrapped around a generally annular core member.
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4718011 |
Well logging data acquisition, telemetry and control method and system
A downhole microprocessor controller disposed in a well logging sonde receives and stores one or more preselected tables or series of logging tool commands down loaded from a surface computer...
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4709234 |
Power-conserving self-contained downhole gauge system
The power-conversing apparatus includes a plurality of independently energizable electrical circuits used in receiving electrical signals from a transducer which senses an environmental condition,...
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4665398 |
Method of sampling and recording information pertaining to a physical condition detected in a well bore
A physical condition in a well bore is sampled and information taken from the sample is recorded by a method of conserving electrical energy in performing such sampling and recording. The method...
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4663628 |
Method of sampling environmental conditions with a self-contained downhole gauge system
The method for controlling the rate at which a downhole logging tool samples and records a detected condition obtains three samples of the condition at three consecutive sample times and computes a...
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