| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 340855400 | Pulse or digital signal transmission | 13 |
| 20080204270 | MEASUREMENT-WHILE-DRILLING MUD PULSE TELEMETRY REFLECTION CANCELATION - Method and apparatus for optimizing mud pulse telemetry data rate by processing a sequence of measured pulses to minimize adverse effects of pressure pulse reflections, attenuations and distortions. A downhole telemetry unit cooperating with a sensor and disposed in a MWD or LWD logging tool generates a sequence of pulse within the mud column. The sequence is encoder to represent the response of the sensor disposed within the logging tool. The encoded pulse sequence is sensed at the surface of the earth using a pressure transducer. The output of the transducer yields an electrical signal that is typically attenuated and can contain reflections and distortions. This measured signal output is processed to minimize the effects of pulse reflections, attenuations and distortions thereby yielding a primary pulse sequence that is more representative of the response of the sensor and allowing an increase in mud pulse telemetry data rate. | 08-28-2008 |
| 20080224888 | Systems and methods for digital signal processing - A control system for a vehicle is provided. The control system includes a signal processing module that receives a sensor signal and extracts a plurality of sample points from the sensor signal. A computation module computes a summation of the sample points, computes a summation of squares of the sample points, and computes a standard deviation based on the summation of the sample points and the summation of the squares of the sample points. A control module generates a control signal based on the sensor signal and the standard deviation. | 09-18-2008 |
| 20090135023 | NOISE CANCELLATION IN WELLBORE SYSTEM - Disclosed herein is a method of canceling noise in a wellbore telemetry system. The method includes, acquiring at least one signal in the system, predicting at least one deterministic component of the at least one signal based upon a change of at least one deterministic component from past signal values, and subtracting the at least one predicted deterministic component from the acquired at least one signal. | 05-28-2009 |
| 20090267791 | INTELLIGENT EFFICIENT SERVO-ACTUATOR FOR A DOWNHOLE PULSER - An improved energy efficient intelligent pulser driver used for generating a mud pulse in a MWD (measurement while drilling) application. In the pulser driver, a direct current (DC) powered control circuit activates a three-phase DC brushless motor that operates a servo-valve. Opening of the servo-valve equalizes pressure in a plenum causing the operation of a main valve reducing flow area and causing a pressure spike in the mud column. Closing of the servo-valve creates a reduction in mud pressure that operates the main valve and increases the flow area causing an end to the pressure spike. The servo-valve is powered both in opening and closing operations by the motor. | 10-29-2009 |
| 20100245121 | 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 receiver, system and/or method generate a first result based on a comparison of the extracted sequence of symbols and one or more possible matching digital signals of a set of idealized model data according to a Bayesian probability theory. The receiver, system and/or method generates a second result based on a comparison of an equalized version of the digital incoming signal and the one or more possible matching digital signals. The receiver, system and/or method generates a third result based on a comparison of the extracted sequence of symbols and one or more possible matching digital signals of a modified set of idealized model data. The receiver, system and/or method compare the first, second and third results to determine an idealized result, and identify a decoded signal for the actual incoming signal based on the idealized result. | 09-30-2010 |
| 20100295702 | High Speed Telemetry Full-Duplex Pre-Equalized OFDM Over Wireline for Downhole Communication - A Full-Duplex Pre-equalized OFDM system for high speed telemetry down-hole wire-line communication. The system compensates for the narrow bandwidth, high attenuation of, and noise in a downhole wireline using Trellis Code Modulation and Reed Solomon encoding. | 11-25-2010 |
| 20130082845 | ESTIMATION AND COMPENSATION OF PRESSURE AND FLOW INDUCED DISTORTION IN MUD-PULSE TELEMETRY - A method for reconstituting a signal due to a flow distortion in a mud-pulse telemetry system, having steps of obtaining at least one parameter to be transmitted by a transmitter to a receiver through the mud-pulse telemetry system, estimating a change in a flow rate in a borehole fluid along a trajectory of the mud-pulse telemetry system undergoing a fluid distortion, estimating a Doppler rate of the signal traveling through the borehole fluid along the trajectory of the mud-pulse telemetry system, calculating a Doppler compensation value for the signal sent along the trajectory in the borehole fluid, transmitting the signal of the at least one parameter through the mud-pulse telemetry system, receiving a portion of the signal of the at least one parameter and reconstituting at least a portion of the signal using the Doppler compensation value. | 04-04-2013 |
| 20150109140 | Compression and Timely Delivery of Well-Test Data - A modem is described having a transceiver assembly, a non-transitory processor readable medium coupled to the transceiver assembly, transceiver electronics coupled to the transceiver and the non-transitory processor readable medium, and a power supply supplying power to the transceiver assembly and the transceiver electronics. The transceiver electronics are configured to calculate a size of an output bit stream based on an encoding scheme to encode for transmission data stored in the non-transitory processor readable medium, decimate the data if the size of the output bit stream exceeds a predetermined size, recalculate the size of the output bit stream, after decimation of the data, based on the encoding scheme to encode for transmission the decimated data, and encode the data using the encoding scheme. | 04-23-2015 |
| 20150354338 | Downhole Apparatus with Extendable Digitized Sensor Device - An apparatus comprising a downhole tool operable to measure a characteristic of a subterranean formation from within a wellbore extending into the subterranean formation. The downhole tool may include a plurality of sensor devices each extendable from a body of the downhole tool by a corresponding pair of arms. Each of the plurality of sensor devices may comprise a plurality of source and measuring electrodes collectively operable to obtain a plurality of measurements pertaining to the characteristic of the subterranean formation, as well as circuitry operable to digitize the plurality of obtained measurements and generate a digital signal corresponding to the characteristic of the subterranean formation | 12-10-2015 |
| 20150361785 | Up Hole Transmission Of Well Data Based On Bandwidth - Methods, computer-readable media, and systems for up hole transmission of well data based on bandwidth are described. A down hole type data transmission tool includes an input device to receive data from a well tool. The tool includes a processor to determine that sufficient bandwidth is unavailable to transmit all of the received data up hole to a data receiving device in real time, and, responsively, divide the data into a portion to be transmitted up hole in real time and a remainder to be transmitted later. The remainder can be buffered in a memory and transmitted at a later time, for example, when sufficient bandwidth is available. | 12-17-2015 |
| 20150361788 | SYSTEM AND METHOD FOR MANAGING BATTERIES FOR USE IN A DOWNHOLE DRILLING APPLICATION - The present disclosure is directed at methods, systems, and techniques for managing batteries for use in a downhole drilling application. The system includes a power bus, pairs of battery terminals for connecting to batteries, switching circuitry that connects and disconnects the batteries to the power bus, data collection circuitry that obtains battery parameters obtained during system operation, and a controller that controls the switching circuitry and receives the battery parameters. A control line connects the controller to the switching circuitry and a data line connects the controller to the data collection circuitry, with the control and data lines being distinct such that control and data signals are not multiplexed with each other. | 12-17-2015 |
| 20160032714 | Telemetry System and Method of Operating the Same - Methods and related apparatus pertaining to downhole and surface telemetry, such as a method in which a telemetry system is provided with a communication path formed with an electrically conductive transport medium coupled across a plurality of downhole nodes. Such method includes operating on the communication path with a multi-drop system that provides telemetry to the downhole nodes in a wellbore, including employing modulation in a master-slave arrangement using binary differential phase shift keying or differential quadrature phase shift keying. | 02-04-2016 |
| 340855500 | Digital signal processing in subsurface transmitter | 1 |
| 20090045975 | DOWNHOLE COMMUNICATIONS MODULE - A communication module for use in wellbore logging operations. The module is attachable around a wireline, slickline, tubing or coiled tubing having a logging tool on its end. The module includes a drive means for transporting it down the line, a controller for controlling its operation, and communications for communicating with the logging tool. Communication between the module and the logging tool includes the transfer of data and operational instructions. | 02-19-2009 |
