Class / Patent application number | Description | Number of patent applications / Date published |
367083000 | Through well fluids | 43 |
20080239872 | Wireless Logging of Fluid Filled Boreholes - A predetermined condition in a fluid-filled wellbore system can be detected by generating at least one sound in the wellbore system in response to the condition, such that a detectable change is created in some characteristic of the emitted sound, and detecting the at least one sound and the change, the detection being indicative that the predetermined condition has occurred. Equipment for facilitating detection of the condition can include a trigger operable in response to the condition; a generator operable to emit sound in the borehole and to create a detectable change in some characteristic of the emitted sound in response to the trigger; and at least one sensor operable to monitor the sound and detect the change, the detection being indicative that the predetermined condition has occurred. It is also possible to estimate a value of a property of a fluid-filled wellbore system. This can be accomplished by recording data including at least one of pressure and rate of flow at one or more locations in the wellbore system, and then estimating the value of the property by employing a model for predicting at least one of pressure and rate of flow dependent upon parameters detailing at least one of wellbore system geometry, viscoacoustic properties of the fluid and entrained solids contained in the wellbore system, locations of boundaries and entrained solids, and characteristics and locations of disturbances to pressure and flow in the wellbore system, in order to determine a best prediction of some attribute of the recorded data. | 10-02-2008 |
20090016159 | 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 signals from a downhole environment to surface, the downhole tool comprising a fluid actuated flow restrictor; a first fluid flow path for flow of actuating fluid to actuate the flow restrictor; a second fluid flow path for flow of actuating fluid to actuate the flow restrictor; and a control member movable between a first closed position where the first fluid flow path is closed and the second fluid flow path is open, and a discrete second closed position where the first fluid flow path is open and the second fluid flow path is closed, for controlling actuation of the flow restrictor to generate a fluid pressure pulse. | 01-15-2009 |
20090016160 | Estimation of Multichannel Mud Characteristics - Separation of telemetry and noise signals in a telemetry system is accomplished by modeling the system as one in which two sources are operating simultaneously. Direct and indirect implementations by IIR and FIR filters are discussed. | 01-15-2009 |
20090034368 | APPARATUS AND METHOD FOR COMMUNICATING DATA BETWEEN A WELL AND THE SURFACE USING PRESSURE PULSES - In one aspect, wellbore apparatus is disclosed that includes a conduit that contains a non-circulating liquid therein and is configured to be placed in a well, and a transmitter that is configured to transmit pressure pulses through the liquid in the conduit. In another aspect, a method is disclosed that includes placing a conduit in the wellbore that is closed at one end and contains a liquid medium therein, and transmitting information in the form of pressure pulses through the liquid medium in the conduit. | 02-05-2009 |
20090073809 | METHOD AND APPARATUS FOR ACOUSTIC DATA TRANSMISSION IN A SUBTERRANEAN WELL - The disclosure describes a method and apparatus for effectively communicating data along an acoustic transmission path. The method comprises driving an acoustic transmitter to send a data signal along the acoustic transmission path, where the signal is distorted by ambient noise. The distorted signal is input to a spaced apart plurality of sensors so that consequent time-delayed signals provide reinforcement of the basic signal and attenuation of the ambient noise component when combined. | 03-19-2009 |
20090316528 | JOB MONITORING METHODS AND APPARATUS FOR LOGGING-WHILE-DRILLING EQUIPMENT - Job monitoring methods and apparatus for logging-while-drilling equipment are disclosed. A disclosed example method includes obtaining a fluid associated with an underground geological formation, analyzing the fluid with one or more sensors to form respective ones of sensor outputs, identifying a downhole scenario associated with the fluid based on the sensor outputs, the identifying being performed while the sensors are within the underground geological formation, and selecting a telemetry frame type based on the identified downhole scenario. | 12-24-2009 |
20100008190 | Apparatus and Method for Data Transmission from a Rotating Control Device - The present invention generally relates to an apparatus and a method of transmitting data from a rotating control device. In one aspect, a method of transmitting data from a rotating control device coupled to an offshore drilling unit is provided. The method includes the step of generating data relating to a parameter associated with the rotating control device. The method further includes the step of transmitting the data from a transmitting assembly coupled to the rotating control device to a receiving assembly positioned proximate the transmitting assembly. Additionally, the method includes the step of transmitting the data from the receiving assembly to the offshore drilling unit. In another aspect, a data gathering and transmitting system for use with a rotating control device coupled to an offshore drilling unit is provided. In a further aspect, a method for transmitting data generated in a rotating control device coupled to a riser is provided. | 01-14-2010 |
20100110833 | PRESSURE RELEASE ENCODING SYSTEM FOR COMMUNICATING DOWNHOLE INFORMATION THROUGH A WELLBORE TO A SURFACE LOCATION - A pressure release encoding system for communicating downhole information through a wellbore to a surface location include a downhole tool with a valve for providing a fluid restriction to fluid passing in the wellbore, a sensor positioned in the wellbore for sensing a downhole condition in the wellbore, a brake cooperative with the valve for moving the valve between at least two positions in timed relation to the downhole condition sensed by the sensor, and a detector positioned at the surface location for providing a measurement value at the surface location correlative to the time between the changes of the pressure of the fluid in the wellbore. The system associates position of the valve with pressure transduction. The sensor is an inclination sensor for sensing an angle of inclination of the wellbore. | 05-06-2010 |
20100195442 | MUD PULSE TELEMETRY DATA MODULATION TECHNIQUE - A technique for communicating data within a wellbore is provided. In one embodiment, a method includes receiving digital data and encoding the digital data into symbols each representative of one or more data bits of the digital data In this embodiment, the method also includes modulating the phase of an acoustic wave within the wellbore to represent the plurality of symbols, wherein modulating the phase of an acoustic wave includes changing the phase of the acoustic wave such that the acoustic wave includes smooth phase transitions between successive phases representative of the plurality of symbols. Various additional methods, systems, and devices are also provided. | 08-05-2010 |
20110026362 | Telemetry Coding and Surface Detection for a Mud Pulser - A method for encoding a non-negative integer, for example, representative of MWD/LWD data, includes encoding at least a portion of the integer using at least a first order Fibonacci derived sequence. The remainder of the integer may be encoded using conventional Fibonacci encoding. The invention tends to improve coding efficiency, downhole and surface synchronization, and surface detection. | 02-03-2011 |
20110280105 | Downhole Turbine Communication - In one aspect of the present invention a downhole drill string assembly includes a bore there through to receive a flow of drilling fluid, a signal generator that produces a signal in the drilling fluid by rotating within the flow, a processing unit disposed within the assembly, and a flow guide that directs drilling fluid to the signal generator. The flow guide is in communication with the processing unit so that in response to commands received from the processing unit, the signal generator produces a signal in the drilling fluid by the flow guide changing its position. | 11-17-2011 |
20110286308 | Downlinking Communication System and Method - A downlinking signal is transmitted downhole from the surface using drilling fluid as the communications medium. The downlinking signal includes at least a synchronization phase and a command phase. Attributes of the synchronization phase are used upon reception of the signal to determine corresponding attributes of the command phase. Commands may be transmitted downhole while drilling and simultaneously while using mud-pulse telemetry uplinking techniques. | 11-24-2011 |
20110286309 | Downlinking Communication System and Method Using Signal Transition Detection - A downlinking signal is transmitted downhole from the surface using drilling fluid as the communications medium. The downlinking signal includes at least a synchronization phase and a command phase. The downlinking signal is differentiated upon reception such that attributes of the synchronization phase may be used to determine corresponding attributes of the command phase. Commands may be transmitted downhole while drilling and simultaneously while using mud-pulse telemetry uplinking techniques. | 11-24-2011 |
20120039151 | MUD PULSE TELEMETRY SYNCHRONOUS TIME AVERAGING SYSTEM - Apparatus and methods for removing the effects of directional drilling systems drilling fluid pulses to allow a MWD mud pulse telemetry system to operate without interference. The methodology is based upon Synchronous Time Averaging (STA). With STA, any pressure fluctuation that is cyclical (or synchronous) with a measurable event can be profiled and subsequently subtracted from a mud pulse telemetry signal. STA functions by placing a strobe in such a manner that the strobe is triggered for each cyclical event. The cyclical event in this disclosure is one (or more) revolution(s) of the drill string. If there is a pressure fluctuation that correlates to that cyclical event, it will be identified by a stable profile of that pressure fluctuation. This pressure profile is then used to remove the cyclical pressure fluctuation from the input mud pulse telemetry signal thereby allowing normal operation of the mud pulse telemetry system. | 02-16-2012 |
20120106297 | DOWNHOLE APPARATUS, DEVICE, ASSEMBLY AND METHOD - A downhole assembly includes an apparatus for generating a fluid pressure pulse downhole. A disclosed apparatus for generating a fluid pressure pulse downhole includes an elongate, generally tubular housing defining an internal fluid flow passage and having a housing wall. The apparatus also includes a device for selectively generating a fluid pressure pulse, the device having a cartridge which can be releasably mounted entirely within a space provided in the wall of the tubular housing. The internal fluid flow passage defined by the tubular housing is a primary fluid flow passage. A secondary fluid flow passage has an inlet which communicates with the primary fluid flow passage. The cartridge houses a valve actuable to control fluid flow through the secondary fluid flow passage to selectively generate a fluid pressure pulse. Data relating to a measured downhole parameter or parameters can be transmitted to surface via the pressure pulses. | 05-03-2012 |
20120127829 | GENERATING FLUID TELEMETRY - A downhole tool includes a tool body, stator, and rotor. The tool body is aligned along a tool centerline and includes an aperture therethrough operable to pass a fluid to an exterior of the body. The stator is fixed relative to the tool body and includes a fluid flow restriction operable to pass at least a portion of the fluid from an interior of the stator to the exterior of the body at an adjustable flow rate. The rotor is disposed within the tool body and rotatable relative to the stator and includes an exhaust port selectively aligned with at least one aperture through the tool body by rotation of the rotor relative to the stator. The exhaust port is operable to pass at least a portion of the fluid from an interior of the rotor to the exterior of the body when aligned with the aperture. | 05-24-2012 |
20130003501 | METHODS AND APPARATUS FOR LOCATING HIDDEN OR BURIED NON-CONDUCTIVE PIPES AND LEAKS THEREFROM - Methods and apparatus for locating a hidden or buried non-conductive fluid pipe and leaks therefrom are presented in which a current signal is injected into fluid in a hidden or buried non conductive pipe and the resulting induced magnetic field is detected to determine the location of the pipe and leaks therefrom according to the spatial variation of the intensity of the magnetic field. In one approach, a pulser injects a plurality of individual electrical current pulses directly into water in pipe. The pulsed currents in the pipe can be returned to the pulser by a wire conductor independent from ground. A coil detector senses the magnetic fields created in the water in the pipe. Leak detection can be enhanced by providing a current path through earth ground for leakage current due to water leaks in the water pipe and utilizing a variable resistor to control the amount of current returning to the pulser. | 01-03-2013 |
20130083627 | REMOTE COMMUNICATION WITH SUBSEA RUNNING TOOLS VIA BLOWOUT PREVENTER - An acoustic modem located on a blowout preventer stack communicates with a running tool acoustic modem located on a subsea running tool disposed within a subsea wellhead, tree or tubing spool. The acoustic modem and the running tool acoustic modern transmit and receive acoustic signals through a column of fluid in the blowout preventer stack. The acoustic modem is communicatively coupled to a subsea electronics module located on the blowout preventer stack and further communicatively coupled to a central control unit located on a platform at the surface. The running tool acoustic modem is communicatively coupled to a controller that receives data from sensors on the running tool and sends operational signals to functions of the running tool. An operator at the surface may control the running tool through the acoustic modems, and the running tool may communicate the running tool status to the operator through the acoustic modems. | 04-04-2013 |
20130170318 | DEVICE AND METHOD FOR ATTENUATING ACOUSTIC SIGNALS - Illustrative embodiments of the present disclosure are directed to methods and devices for attenuating acoustic signals traveling within bodies. A device includes a body and at least one acoustic attenuator disposed along the body. The attenuator includes a cavity and granular particles disposed within the cavity. A liquid is also disposed within the cavity. A restrictor applies a stress to the granular particles within the cavity. | 07-04-2013 |
20140036629 | Downlinking Communication System And Method - A downlinking signal is transmitted downhole from the surface using drilling fluid as the communications medium. The downlinking signal includes at least a synchronization phase and a command phase. Attributes of the synchronization phase are used upon reception of the signal to determine corresponding attributes of the command phase. Commands may be transmitted downhole while drilling and simultaneously while using mud-pulse telemetry uplinking techniques. | 02-06-2014 |
20140254322 | Telemetry Coding and Surface Detection for a Mud Pulser - A method for receiving an encoded integer includes acquiring a digitized waveform including a first plurality of pulses distributed among a second plurality of time slots, locating each of the pulses in the digitized waveform, computing a confidence value for each of the pulses, selecting a subset of the plurality of pulses, the subset including pulses having low confidence values computed, generating a set of unique waveforms corresponding to various combinations of the subset of pulses selected, computing a cross-correlation between each of the waveforms generated and the digitized waveform acquired, and selecting the waveform having the highest cross-correlation computed. | 09-11-2014 |
20140340990 | Method And Assembly For Determining Landing Of Logging Tools In A Wellbore - An assembly using an onboard controller employs sensors to precisely determine the landing status of downhole logging tools. A control algorithm of the onboard controller can enable an intelligent management of the battery system and memory system of the logging tools. Sensors are used to verify landing having been reached. The sensors may include a real time clock, a pressure sensor, a temperature sensor, and a proximity/position sensor. The sensors can send measurement signals to the controller for determining if the measurement values are within an acceptable range indicating the logging tools having landed. As a correct landing has been confirmed or verified, the controller can trigger an onset for data logging (e.g., powering up the battery system and/or memory system). A method of determining landing of a logging tool in a wellbore is disclosed. | 11-20-2014 |
20150330217 | DOWNHOLE TELEMETRY SIGNAL MODULATION USING PRESSURE PULSES OF MULTIPLE PULSE HEIGHTS - A method for modulating a downhole telemetry signal uses a fluid pressure pulse generator that generates pressure pulses of multiple pulse heights in a drilling fluid. The method comprises: converting measurement data into a bitstream comprising symbols of a selected symbol set; encoding the bitstream into a pressure pulse telemetry signal using a modulation technique that includes amplitude shift keying, wherein each symbol of the selected symbol set is assigned a pressure pulse having a unique amplitude; and generating pressure pulses in the drilling fluid corresponding to the telemetry signal. Alternatively, the method can comprise a modulation technique that includes amplitude shift keying and phase shift keying and wherein each symbol of the selected symbol set is assigned a pressure pulse having a unique combination of amplitude and phase. | 11-19-2015 |
20150345287 | DOWNHOLE MWD SIGNAL ENHANCEMENT, TRACKING, AND DECODING - A method for transmitting data from a MWD system at the BHA of a drill string may include transmitting the data in a MWD signal from the MWD system. The MWD signal may be modulated at a position closer to the surface onto a mud pulse modulated signal. The mud pulse modulated signal may be generated by a downhole friction reducing device. The downhole friction reducing device may include a mud motor. The mud motor may create pressure pulses based on its speed of rotation. The downhole friction reducing device may include a modulating valve. The modulating valve may be electromechanically or mechanically operated. The modulated signal may be detected at the surface by a receiver using one or more pressure or flow sensors. The receiver may use one or more harmonics of the modulated signal to receive the data. | 12-03-2015 |
20160084077 | MUD PULSE TELEMETRY WITH CONTINUOUS CIRCULATION DRILLING - A system for performing a wellbore operation while a fluid circulates in a wellbore may include a string, a fluid circulation system, a control device, The string may include at least a first tubular section and a second tubular section. The a fluid circulating system has a first fluid path and a second fluid path, wherein only one of the first fluid path and the second fluid path circulate the fluid into the string at a specified time. The control device selects one of the first or second fluid path through which to convey the fluid into the string, at least one signal generator in hydraulic communication with the circulating fluid, the at least one signal generator configured to impart at least one pressure signal into the circulating fluid, and at least one pressure transducer in pressure communication with the circulating fluid and configured to detect the imparted at least one pressure signal, wherein the at least one signal generator and the at least one pressure transducer form a communication link, the communication link configured to convey information between at least two locations along a flow path of the circulating drilling fluid, irrespective of the fluid path selected by the control device to convey the fluid into the drill string. | 03-24-2016 |
20160130937 | TELEMETRY SYSTEMS WITH COMPENSATION FOR SIGNAL DEGRADATION AND RELATED METHODS - This invention comprises systems, methods and apparatus for mud pulse telemetry involving sending benchmark pulses with known characteristics (such as amplitude or duration) from the surface to the BHA, measuring those characteristics at the BHA, using those measurements to predict the likely attenuation of downhole-to-surface mud pulse transmissions, and adjusting those transmissions to compensate for high attenuation or to obtain energy savings (or transmission rate increases) during low-attenuation conditions. Further refinements on these systems and methods, particularly concerning the use of signal-to-noise ratio measurements at the surface to more efficiently predict attenuation, are also disclosed. | 05-12-2016 |
20160146001 | Downhole Telemetry Systems with Voice Coil Actuator - Pulse telemetry systems and methods for communicating digital data from a wellbore to a surface unit are presented that include a valve fluidly coupled to drilling fluid. The valve adjusts pressure in a drillpipe to cause pressure transitions within the drilling fluid within the drillpipe to transmit data over the drilling fluid. The valve includes a voice coil actuator for developing the pressure transitions within the drilling fluid. Other systems and methods and are included. | 05-26-2016 |
20160168984 | HIGH-SPEED, WIRELESS DATA COMMUNICATION THROUGH A COLUMN OF WELLBORE FLUID | 06-16-2016 |
20160186555 | Controlled Pressure Pulser for Coiled Tubing Applications - An apparatus, method, and system for generating pressure pulses in a drilling fluid flowing within coiled tubing assembly is described that includes; a flow throttling device longitudinally and axially positioned within the center of a main valve actuator assembly that allows main exit flow fluid to flow past a drive shaft and motor such that the pilot fluid and the main exit flow fluid causes one or more flow throttling devices to generate large, rapid controllable pulses. The pulses generated by the flow throttling device thereby allow transmission of well-developed signals easily distinguished from any noise resulting from other vibrations due to nearby equipment within the borehole or exterior to the borehole, or within the coiled tubing assembly wherein the signals also provide predetermined height, width and shape of the signals. | 06-30-2016 |
20160201456 | DOWNHOLE TOOL | 07-14-2016 |
367084000 | Rotary valve control | 11 |
20080267011 | 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. | 10-30-2008 |
20090086576 | REAL TIME TELEMETRY - A real time telemetry system is disclosed for use with a drilling system including a rotary valve | 04-02-2009 |
20090285054 | Downhole Telemetry System and Method - A downhole telemetry system for use in a wellbore including borehole fluid. The system includes a stator including flow channels though the stator and a rotor including flow channels though the rotor. The rotor is rotatable on a drive shaft by the force of the borehole fluid flowing through the rotor. The rotation of the rotor creates pressure variations in the borehole fluid related to the movement of the rotor channels relative to the stator channels, thus forming a carrier wave. A regulating system adjusts the amount of fluid force on the rotor for a given flow rate of borehole fluid to maintain the frequency of the carrier wave within a range of a target frequency. Also, an alternator drivable by the rotation of the drive shaft provides power to the system. The system also includes an encoder capable of adjusting the rotation of the rotor to modulate the carrier wave. | 11-19-2009 |
20100157735 | APPARATUS FOR CREATING PRESSURE PULSES IN THE FLUID OF A BORE HOLE - An apparatus for creating pressure pulses in the fluid of a bore hole is described. The preferred embodiment takes the form of a mud pulser apparatus ( | 06-24-2010 |
20130250728 | ROTARY PULSER AND METHOD 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 pulser includes a rotor having blades that are capable of imparting a varying obstruction to the flow of drilling fluid through stator passages, depending on the circumferential orientation of the rotor, so that rotation of the rotor by a motor generates the encoded pressure pulses. A spring biases the rotor toward the stator so as to reduce the axial gap between the rotor and stator. When the pressure drop across the rotor becomes excessive, such as when increasing drilling fluid flow rate or switching from a high data rate to a low data rate transmission mode, the spring bias is overcome so as to increase the axial gap and reduce the pressure drop across the rotor, thereby automatically reducing the thrust load on the bearings. | 09-26-2013 |
20140160891 | DRILLSTRING COMBINATION PRESSURE REDUCING AND SIGNALING VALVE - A drillstring combination pressure reducing and signaling valve assembly uses multiple ball valves mounted in parallel, each having a different bore, to meter the flow through a drillstring. The individual ball valves are maintained in either a fully open or a fully closed position, but can be selectively moved between these two positions. The bores of the individual ball valves are sized so that at a given pressure, a first ball valve has a predetermined flow rate, a second ball valve has twice the flow rate of the first ball valve, a third ball valve has twice the flow rate of the second ball valve, and the remaining ball valves each have twice the flow rate of their predecessor in the valve sequence. This arrangement permits the flow rate and flow pressure drop through the assembly of valves to be digitally controlled by varying the combination of open and closed valves. In addition, another ball valve serving as a signaling valve is rapidly shifted either between a closed position, an open position, and back to a closed position. The signaling valve serves as a bidirectional signaling valve by relaying sensed pressure pulse signals emanating from either above or below the signaling valve past the valve assembly. Alternatively, the additional ball valve can be rapidly shifted between an initial open position to a closed position and then to a final open position. Pressure sensing is provided both above and below the valve assembly, and operative and control means are provided for the valve assembly. | 06-12-2014 |
20140340991 | MUD PULSER WITH HIGH SPEED, LOW POWER INPUT HYDRAULIC ACTUATOR - A method of modulating information on pressure fluctuations transmitted via a tubular string can include applying pressure to a piston, thereby axially displacing the piston, axially displacing and rotating an intermediate sleeve in response to the piston displacement, rotating an output member in response to the axial displacement and rotation of the intermediate sleeve, and rotating a variable flow restrictor rotor relative to a stator, the rotor being connected to the output member. A mud pulser can include a variable flow restrictor, and an actuator which operates the flow restrictor and modulates information on pressure fluctuations produced by the flow restrictor, the actuator including a piston which displaces axially in response to a pressure differential, an intermediate sleeve which is both rotated and displaced axially by the piston, and an output member which is rotated by both rotation and axial displacement of the intermediate sleeve. | 11-20-2014 |
20150300160 | FLUID PRESSURE PULSE GENERATOR AND METHOD OF USING SAME - A fluid pressure pulse generator comprising a stator and rotor that can be used in measurement while drilling using mud pulse or pressure pulse telemetry is disclosed. The stator comprises a stator body with a circular opening therethrough and the rotor comprises a circular rotor body rotatably received in the circular opening of the stator body. One of the stator body or the rotor body comprises one or more than one fluid opening for flow of fluid therethrough and the other of the stator body or the rotor body comprises one or more than one full flow chamber. The rotor is rotatable between a full flow configuration whereby the full flow chamber and the fluid opening align so that fluid flows from the full flow chamber through the fluid opening, and a reduced flow configuration whereby the full flow chamber and the fluid opening are not aligned. The flow of fluid through the fluid opening in the reduced flow configuration is less than the flow of fluid through the fluid opening in the full flow configuration thereby generating a fluid pressure pulse. | 10-22-2015 |
20150322779 | MUD PULSE TELEMETRY APPARATUS WITH A PRESSURE TRANSDUCER AND METHOD OF OPERATING SAME - A pressure measurement apparatus for a downhole measurement-while-drilling tool comprises a feed through connector and a pressure transducer. The feed through connector comprises a body with opposing first and second ends, at least one electrical interconnection extending axially through the body and out of both ends, and a pressure transducer receptacle in the first end and a communications bore extending from the receptacle to the second end. The pressure transducer is seated in the receptacle such that a pressure at the first end can be measured, and comprises at least one electrical contact that extends from the pressure transducer through the communication bore and out of the second end. The pressure transducer can take pressure measurements for predicting wear of a primary seal in a motor subassembly of the tool, detect a pressure-related battery failure event, and control operation of a dual pulse height fluid pressure pulse generator. | 11-12-2015 |
20150322780 | Mud Pulse Telemetry Devices, Systems, and Methods - Devices, systems and methods for transmitting downhole data are provided. The devices include a rotor-stator modulator configured for use in a drill string, and a drive and control system configured to drive the rotor according to a modulation scheme resulting in both oscillating and full rotational movement. The modulation scheme can comprise a trajectory algorithm such as a QAM trajectory algorithm. The systems include a modulator disposed within a drill string which creates modulated pulses according to an algorithm providing for both oscillating and full rotational movement of the rotor, and may also include a demodulator. The methods include transmitting coded data by driving a rotor relative a stator disposed in a drill string according to a modulation scheme that provides both oscillating and full rotational movement and results in modulated mud pulses representative of data recorded downhole, and may involve decoding the data. | 11-12-2015 |
20160040529 | BOREHOLE FLUID-PULSE TELEMETRY APPARATUS AND METHOD - A fluid pulse generator for use in a drill string comprises an elongate obstruction member mounted in a fluid passage for driven pivoting about a pivot axis transverse to the fluid passage, obstruction of the fluid passage by the obstruction member being variable in relation to pivotal position of the obstruction member. Telemetry signals can be transmitted along the drill string by driven pivoting of the obstruction member, to generate data pulses in drilling fluid in the drill string. Pressure-locking of the obstruction member in a maximally obstructive position can be counteracted by provision of a bypass arrangement to allow bypass flow at a leading end of the obstruction member. | 02-11-2016 |
367085000 | Linear valve control | 2 |
20130215718 | DEVICE FOR GENERATING PRESSURE PULSES IN FLOWING FLUID AND METHOD FOR THE SAME - A device for generating pressure pulses in flowing fluid includes a valve having a stem movable linearly relative to a passageway. The valve is configured to vary restriction to flow through the passageway in response to changes in relative position between the stem and the passageway. The device also includes a rotatable member in operable communication with the valve such that rotation of the rotatable member causes the stem to move, and a motion translation arrangement that is in operable communication with the rotatable member and the stem such that the stem linearly reciprocates in response to the rotatable member rotating in a single direction of rotation. | 08-22-2013 |
20160138391 | MUD HAMMER - A mud hammer is driven by the flow of drilling fluid to generate pressure pulses. Timing and/or amplitude of the pulses are altered to encode data by applying electromagnetic forces to a movable member of the mud hammer. In an example embodiment the movable member carries one or more magnets and electromagnetic forces are applied to the movable member by one or more electromagnets. The mud hammer may also generate electrical power that may be applied to charge batteries and/or drive downhole electrical apparatus. | 05-19-2016 |