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| Number | Title | Issue Date |
| 8405519 | Pulse emission device for the positionally accurate emission of trigger pulses A control device (1) and a triggering device (2) are coupled to one another for data processing. The control device and the triggering device (2) are electronic devices. The control device (1) determines a respective desired position valu... | 03/26/2013 |
| 8294591 | Digital signal processing receivers, systems and methods for identifying decoded signals A digital signal processing receiver, a system and/or a method identifies a decoded signal. The receiver, system and/or method extract at least one sequence of one or more symbols from a digital incoming signal to generate an extracted sequence of symbols. The recei... | 10/23/2012 |
| 8193946 | Training for directional detection Acoustic telemetry devices and methods that provide directional detection. In one embodiment, a disclosed acoustic telemetry device comprises at least two acoustic sensors and an electronics module. The electronics module combines the detection signals from the acou... | 06/05/2012 |
| 8149133 | MUX BOP database mirroring An apparatus to remotely archive data from a blowout preventer includes a first system controller in communication with the blowout preventer and a communications network, and a second system controller in communication with the blowout preventer and the communicati... | 04/03/2012 |
| 8138943 | Measurement while drilling pulser with turbine power generation unit Disclosed are a system, device, and method for generating pulse signals that correlate to geological information in a wellbore. The system and method comprises a pulse generating device longitudinally and axially positioned within an annular drill collar flow channe... | 03/20/2012 |
| 7940192 | Channel equalization for mud-pulse telemetry Channel estimation and signal equalization is used in a mud-pulse telemetry system for uplink communication during drilling of wellbores. ... | 05/10/2011 |
| 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 motor that rotates a windowed restrictor relative to a fixed housing to... | 05/18/2010 |
| 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 through which a drilling fluid flows is provided. In one aspect, the... | 12/23/2008 |
| 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 |
| 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 |
| 7349365 | Mobile telephone messaging by baseband envelope modulation A method and system communicates messages using a radio signal. The radio signal is transmitted according to an air interface standard for wireless radio communications. A baseband envelope of the transmitted radio signal is modulated while maintaining compliance wi... | 03/25/2008 |
| 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 be combined with a Venturi constriction to provide enhanced... | 03/18/2008 |
| 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 they are decoded so as to decipher the information. The pulser includes... | 02/05/2008 |
| 7322410 | Controllable production well packer An apparatus and method for operating an electrically powered device in a packer using the piping structure of the well as an electrical conductor for providing power and/or communications. The electrically powered device may comprise an electrically controllable va... | 01/29/2008 |
| 7319690 | Communication signal equalization systems and methods Communication signal equalization methods and systems are disclosed. A CDMA signal having a data portion and a known portion including a known or repeated data sequence and received over a multipath communication channel represents a linear convolution between the m... | 01/15/2008 |
| 7289048 | Duo-binary encoder and optical duo-binary transmission apparatus using the same A duo-binary encoder performs a parallel processing and an optical duo-binary transmission apparatus using the encoder to enhance transmission capability. The duo-binary encoder has a judgment unit for judging whether an odd number or even number of ‘0’s exists ... | 10/30/2007 |
| 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 oscillates in close proximity to the stator, at least partially block... | 10/09/2007 |
| 7259688 | Wireless reservoir production control A reservoir production control system includes a plurality of wells for producing a reservoir linked to a central computer over a downhole communication network and a surface communication network. Both the downhole and the surface communication networks are wireles... | 08/21/2007 |
| 7253671 | Apparatus and method for compensating for clock drift in downhole drilling components A precise downhole clock that compensates for drift includes a prescaler configured to receive electrical pulses from an oscillator. The prescaler is configured to output a series of clock pulses. The prescaler outputs each clock pulse after counting a preloaded num... | 08/07/2007 |
| 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 the non-venting pulser is adapted to generate pressure fluctuations in ... | 07/31/2007 |
| 7245229 | Drill string rotation encoding A method for communicating with a downhole device is provided. The method includes predefining an encoding language including codes understandable to the device, the codes represented in the language as predefined value combinations of drill string rotation variable... | 07/17/2007 |
| 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 permanent magnets at the rotor and a rotational screen disk/static s... | 06/12/2007 |
| 7209840 | Systems and methods for providing remote monitoring of electricity consumption for an electric meter A system for providing remote monitoring of electricity consumption is provided. In one embodiment the system may comprise electric meters, communication devices having a unique address and defining a wireless communication network, and a site controller. Each elect... | 04/24/2007 |
| 7209407 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 04/24/2007 |
| 7206327 | Method and circuit for insertion of time stamp into real time data A system for adding a time stamp to transmission traffic on a network comprises a front end processor that receives a packet from the network and generates a Start Of Frame pulse and a LENGTH field corresponding to a length of the packet. A time stamp generator gene... | 04/17/2007 |
| 7200070 | Downhole drilling network using burst modulation techniques A downhole drilling system is disclosed in one aspect of the present invention as including a drill string and a transmission line integrated into the drill string. Multiple network nodes are installed at selected intervals along the drill string and are adapted to ... | 04/03/2007 |
| 7180825 | Downhole telemetry system for wired tubing A communications system employing discrete multi-tone (“DMT”) modulated signals on a communications channel formed by inductively-coupled pipe. In one embodiment, the communications system includes a string of wired pipe joints that couple a transmitter to a rec... | 02/20/2007 |
| 7173395 | Inverter unit grounding method and inverter unit A circuit system that includes a sensor circuit for a sensor that detects the state of a motor is provided in an inverter unit for driving the motor. A 0V of the circuit system is connected with a shield braid of a shielded cable that connects the sensor circuit and... | 02/06/2007 |
| 7170424 | Oil well casting electrical power pick-off points A power supply apparatus is provided for supplying power and communications within a first piping structure. An external power transfer device is positioned around the first piping structure and is magnetically coupled to an internal power transfer device. The inter... | 01/30/2007 |
| 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 |
| 7147059 | Use of downhole high pressure gas in a gas-lift well and associated methods A gas-lift petroleum well and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well having a well casing, a production tubing, a packer, and a gas-lift valve. The well casing extends within a wellbore of the well, ... | 12/12/2006 |
| 7145472 | Method and apparatus for high speed data dumping and communication for a down hole tool The present invention provides a high-speed communication and data link between a downhole tool and a surface computer. The present invention provides a plurality of busses inside of the downhole tool for providing multiple data paths between a down hole tool memory... | 12/05/2006 |
| 7114561 | Wireless communication using well casing A petroleum well having a borehole extending into a formation is provided. A piping structure is positioned within the borehole, and an induction choke is positioned around the piping structure downhole. A communication system is provided along the piping structure ... | 10/03/2006 |
| 7089485 | Simple link protocol providing low overhead coding for LAN serial and WDM solutions A data structure, method and protocol wherein synchronization data indicative of a data frame delineation point is inserted within an inter-packet gap (IPG) proximate a data frame during transmission. Optionally, a cyclical redundancy check (CRC) length indicative d... | 08/08/2006 |
| 7082821 | Method and apparatus for detecting torsional vibration with a downhole pressure sensor A method and apparatus for detecting torsional vibration, or stick-slip, in a drill string while drilling is described. The method comprises sampling a downhole pressure sensor and using embedded filter schemes and algorithms to determine, based on the pressure samp... | 08/01/2006 |
| 7081831 | Time-domain signal cancellation in downhole telemetry systems A downhole telemetry system having a surface transceiver, a cable, and a downhole transceiver coupled to the surface transceiver via the cable. The surface transceiver isolates an uplink signal from a combined uplink/downlink signal on the cable using time-domain si... | 07/25/2006 |
| 7073594 | Wireless downhole well interval inflow and injection control An apparatus and methods of electrically controlling downhole well interval inflow and/or injection. The downhole controllable well section having a communications and control module, a sensor, an electrically controllable valve and an induction choke. The electrica... | 07/11/2006 |
| 7075454 | Power generation using batteries with reconfigurable discharge A petroleum well for producing petroleum products that incorporates a system adapted to provide power to a downhole device in the well. The system includes a current impedance device and a downhole power storage device. The current impedance device is positioned suc... | 07/11/2006 |
| 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 a drill bit and the downhole transceiver, acoustic noise generated b... | 06/27/2006 |
| 7055592 | Toroidal choke inductor for wireless communication and control An induction choke in a petroleum well where a voltage potential is developed across the choke to power and communicate with devices and sensors in the well. Preferably, the induction choke is a ferromagnetic material and acts as an impedance to a time-varying curre... | 06/06/2006 |
