Class 340/855.7 - Modification of signal bandwidth, frequency, or circuit impedance at subsurface location

Subclass of Class 340 - Communications: electrical
Definition: Subject matter wherein the information to be transmitted
No. of patents: 37
Last issue date: 04/24/2012

Number	Title	Issue Date
8164477	Joint channel coding and modulation for improved performance of telemetry systems Jointly designed channel coding and modulation are used in an uplink telemetry system for transmitting a message signal from a bottomhole location to a surface location. A constant envelope quadrature-quadrature phase-shift keying may be used. ...	04/24/2012
8077053	Method and apparatus for sensing a borehole characteristic An apparatus and method are disclosed for sensing a characteristic of a borehole. An exemplary apparatus includes a conductive pipe; an inlet, connected to the conductive pipe, for applying pulse to the conductive pipe; a resonant network device connected with the c...	12/13/2011
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 wellbore and a surface location associated with the wellbore by measu...	10/25/2011
8040249	Acoustic telemetry transceiver One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is with...	10/18/2011
7777645	Acoustic telemetry transceiver One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is with...	08/17/2010
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 transmitted once during a predetermined period. The method can comprise th...	10/21/2008
7429934	Mud pulse landing assembly for use in directional drilling A mud pulse landing assembly (10) which allows for the removal of the mud pulse generator (16) containing the mud pulse orifice (106), thus creating an unobstructed passageway for any tool or instrumentation that may need to be passed through th...	09/30/2008
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. ...	09/09/2008
7339494	Acoustic telemetry transceiver One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is with...	03/04/2008
7336198	Magnetostatic communication A system for providing communication of information by modulating a magnetostatic field with a magnetostatic transmitter that modulates said magnetostatic field to contain the information and detecting the information in the modulated field at a distance with a magn...	02/26/2008
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 also include a stator coupled to the tool housing, a restrictor disposed...	02/12/2008
7248995	Spatial position detection method, information input method, spatial position detection apparatus, and information input apparatus To calculate information on a relative distance or positional relationship between an interface section and an object by detecting an electromagnetic wave transmitted through the interface section, and using the electromagnetic wave from the object to detect a relat...	07/24/2007
7230541	High speed communication for measurement while drilling A communication system for communication with a downhole tool comprising: a first communication transceiver in a first tool for measurement while drilling and a second communication transceiver in at least one of the first tool, a second tool for measurement while d...	06/12/2007
7228902	High data rate borehole telemetry system A system and method for communicating information between downhole equipment in a wellbore and surface equipment, comprising a first device disposed in a wellbore for receiving at least one first signal and transmitting at least one second signal. A surface device i...	06/12/2007
7158049	Wireless communication circuit The invention includes a wireless communication circuit and a method of communicating with wireless signals that feature a tank circuit having an inductor connected in parallel with a capacitor circuit. The capacitor circuit includes a pair of capacitors coupled in ...	01/02/2007
7154412	High-power well logging method and apparatus A power delivery system for a wireline tool includes two independent power transmission loops operating on a standard six-conductor cable. The two loops each connect directly to a respective terminals of a DC auxiliary power supply. Each loop also couples through a ...	12/26/2006
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 orifice. The pressure drop across the orifice is used to urge the poppet a...	12/05/2006
7133777	Method for transmitting wellbore data acquired in the wellbore to the surface A method and apparatus are useful for decomposing a complex distribution of data by modeling the complex distribution as a sum of discrete simple distributions, and processing the simple distributions independently. The independent processing enables the complex dis...	11/07/2006
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 downhole telemetry system includes a downhole transmitter, a cable, and a ...	11/07/2006
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 conductors to a first terminal of a data transmittal means and to a firs...	04/11/2006
6975244	Oscillating shear valve for mud pulse telemetry and associated methods of use 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 oscillates in close proximity to the stator, at least partially block...	12/13/2005
6862322	Switchable-bandwidth optical receiver A switchable bandwidth optical receiver is implemented in a front-end of the receiver in at least one of three ways. A switchable impedance may be provided at the input to a preamplifier of the front end, the preamplifier of the front-end may have a switchable imped...	03/01/2005
6791470	Reducing injection loss in drill strings A system and method for transferring wave energy into or out of a periodic structure having a characteristic wave impedance profile at a prime frequency, the characteristic wave impedance profile comprising a real portion and an imaginary portion, comprising: locati...	09/14/2004
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 telemetry system for Measure While Drilling (MWD) applications. MWD applicat...	06/15/2004
6405136	Data compression method for use in wellbore and formation characterization A method is disclosed for compressing a frame of data representing parameter values, a time at which each parameter value was recorded, and an orientation of a sensor at the time each parameter value was recorded. Generally the method includes performing ...	06/11/2002
5724308	Programmable acoustic borehole logging A downhole acoustic logging tool having a random access memory for storing acoustic waveforms in digital format. The waveforms being transmitted from a surface logging system to the random access memory in the downhole logging tool. The logging tool playi...	03/03/1998
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 the sensing of physical characteristics such as pressure an...	11/18/1997
5347859	Dynamometric measuring device for a drill pipe A dynamometric measuring device for a drill pipe which includes, firmly attached to the rotating pipe, sensors disposed in a groove on the pipe and electronics for conditioning the signals supplied by the sensors. The measurement signals are transmitted b...	09/20/1994
5243337	Process and device for optimizing signal transmission rates on multifunctional well cables A process for optimizing the transmission rates of digitized signals on transmission lines in multifunction cables, such as logging cables linking well tools to surface installations. The process includes digitising of the data to be transmitted and codin...	09/07/1993
5191326	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. The protocol is implemented using uplink and downlink pac...	03/02/1993
5055837	Analysis and identification of a drilling fluid column based on decoding of measurement-while-drilling signals The present invention comprises a method and apparatus for estimating and identifying the channel filter characteristics of the drilling fluid communictions channel (e.g. standpipe) based on surface decoding of the MWD data signal. The channel filter char...	10/08/1991
4897646	Method and apparatus for reducing the effective bandwidth of ultrasonic waveform for transmission over a logging cable A method and apparatus for increasing the effective bandwidth of an acoustic return resulting from logging operations. The real time acoustic return is stored in memory. A transmitted acoustic return is produced for transmitting over a logging cable by tr...	01/30/1990
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 phase distortion that is compensated for by FIR filtering ...	01/23/1990
4891641	Method for transmitting data over logging cable The present invention provides an improved method for transmitting logging data from a logging apparatus operating in a well borehole to surface equipment over a logging cable. The logging data has variations in amplitude, which are converted to a frequen...	01/02/1990
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 unit and a surface data processing unit (computer) each of...	04/19/1988
4592033	Apparatus for improving the data transmission rate in a telemetry system The data transmission rate in a cable telemetry system is improved by preconditioning an encoded data signal prior to discriminating and decoding it with a filter/amplifier employing an operational amplifier having a non-inverting input connected to recei...	05/27/1986
4215425	Apparatus and method for filtering signals in a logging-while-drilling system The disclosure is applicable for use in a logging-while-drilling apparatus for obtaining subsurface measurements during drilling in a fluid-filled borehole. Acoustic carrier waves are generated downhole in the borehole fluid and are PSK modulated in accor...	07/29/1980

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Class 340/855.7 - Modification of signal bandwidth, frequency, or circuit impedance at subsurface location