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公开(公告)号：CA2584841C
公开(公告)日：2011-07-05
申请号：CA2584841
申请日：2007-04-12
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , NEFF JAMES M , DRUMHELLER DOUGLAS S
Abstract: Non-contacting means of measuring the material velocities of harmonic acoustic telemetry waves travelling along the wall of drillpipe, production tubing or coiled tubing are disclosed. Also disclosed are contacting means, enabling measurement of accelerations or material velocities associated with acoustic telemetry waves travelling along the wall of the tubing, utilizing as a detector either a wireless accelerometer system or an optical means, or both; these may also be applied to mud pulse telemetry, wherein the telemetry waves are carried via the drilling fluid, causing strain in the pipe wall that in turn causes wall deformation that can be directly or indirectly assessed by optical means. The present invention enables detection of telemetry wave detection in space- constrained situations. The invention also teaches a substantially contactless method of determining the time-based changes of the propagating telemetry waves. A final benefit of the present invention is that it demonstrates a particularly simple contacting means of directly measuring wall movements in live coiled tubing drilling environments.
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公开(公告)号：CA2685688A1
公开(公告)日：2010-05-28
申请号：CA2685688
申请日：2009-11-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： MCRORY JOHN G
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公开(公告)号：CA2585046A1
公开(公告)日：2007-10-11
申请号：CA2585046
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： HILDEBRANDT EDWIN I , SENDYK ANDRZEJ M , CAMWELL PAUL L
Abstract: This invention applies to the means whereby capacitance changes due to varyi ng temperature and/or pressure in a piezoelectric transducer used for acoustic telemetry in a drilling environment is dynamically offset by modifying one o r more parameters associated with the drive or control circuitry of said transducer . The object of the invention is to closely maintain the transducer in a resonant mode, thereby ensuring optimum energy consumption.
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公开(公告)号：CA2585000A1
公开(公告)日：2007-10-11
申请号：CA2585000
申请日：2007-04-10
Applicant: EXTREME ENGINEERING LTD , XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , NEFF JAMES M
Abstract: A method whereby a downhole drilling transmission device that communicates t o the surface automatically modifies its transmission parameters in order that it substantially improves its ability to adequately communicate with a surface receiver despite increasing signal attenuation between the two as the length of drillpipe increases. This utilizes a simple measure of localized downhole pressure that then relies upon a look-up table or similar that provides a correspondence between said pressure and measured depth. Such a look-up table or similar can be readily built by incorporating appropriate features of the planned well such as drilling fluid flow rate, drilling fluid density, drilling fluid viscosity, well profile, bottom hole assembly component geometry, drillpipe geometry, and indications as to whether the fluid is flowing or stationary. Upon determining the measured depth the tool then can attempt to modify or augment appropriate telemetry parameters in order to keep the signal receive d at surface within required parameters, thus offsetting the degradation due to increasing attenuation.
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公开(公告)号：CA2900094C
公开(公告)日：2021-06-01
申请号：CA2900094
申请日：2014-02-07
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： MCRORY JOHN GODFREY
Abstract: An acoustic transmitter for transmitting an acoustic signal through a downhole medium includes a voltage source; a composite load; and switching circuitry that applies voltage from the voltage source across the composite load in response to a drive signal. The composite load includes charge control circuitry, in the form of at least one inductor, connected electrically in series with a piezoelectric transducer that may be electrically modeled as a capacitor.
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Patent Agency Ranking
公开(公告)号：CA2902670C
公开(公告)日：2021-05-04
申请号：CA2902670
申请日：2014-02-28
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL , REEVES MICHAEL
IPC: E21B47/09
Abstract: A method for detecting a downhole position in a wellbore comprises: providing a set of signal emitters, each signal emitter in the set attached to a different position in the wellbore and each signal emitter configured to emit a signal having a unique characteristic; and providing a measurement tool comprising a signal detector configured to detect the different signals and a rotation device configured to rotatably contact a wall of the wellbore. The measurement tool is moved through the wellbore and one or more positions of the measurement tool in the wellbore is determined by detecting one or more of the signals and identifying the position of one or more of the signal emitters by the unique characteristic of each detected signal, and by detecting the number of rotations in a ranging wheel of the rotation detector that contacts the wellbore.
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公开(公告)号：CA2902761A1
公开(公告)日：2014-09-18
申请号：CA2902761
申请日：2014-03-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL , DRUMHELLER DOUGLAS S
IPC: E21B47/16
Abstract: An acoustic receiver for use on a drill string includes a housing attachable to the drill string; a first sensor mounted within the housing for measuring a first parameter at a first location on the drill string and for generating a first parameter signal representative of the first parameter: a second sensor mounted within the housing for measuring a second parameter at a second location on the drill string and for generating a second parameter signal representative of the second parameter; and a controller mounted within the housing and communicatively coupled to the first and second sensors. The magnitudes of the first and second parameters vary in proportion to magnitude of the acoustic wave and the first and second parameters have a quadrature phase relationship. The controller is configured to combine the first and second parameter signals to determine the magnitude of the acoustic wave.
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公开(公告)号：CA2718118C
公开(公告)日：2013-10-15
申请号：CA2718118
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： NEFF JAMES M , CAMWELL PAUL L
Abstract: A method for enhancing downhole telemetry performance comprising enhancing a signal in order to offset signal-to-noise ratio reduction with increasing measured depth, wherein the signal is modified at specified measured depths which are inferred from acoustic wave velocity determination.
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公开(公告)号：CA2691410A1
公开(公告)日：2010-08-01
申请号：CA2691410
申请日：2010-02-01
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , DRUMHELLER DOUGLAS S , WHALEN DAVID D
Abstract: An acoustic telemetry isolation system and method for use with tubular assemblies such as drillpipe and production tubing includes an acoustic wave transmitter and an acoustic isolator. A "down" wave propagated toward the isolator is reflected back substantially in phase with an "up" wave propagated from the acoustic wave source away from the isolator. Furthermore, the acoustic isolator is similarly effective in reflecting "up" propagating waves originating from below the isolator, hence further protecting the acoustic wave source from possible deleterious interference. The construction of the isolator utilizes a specified combination of waves traveling in parallel in materials whose properties aid the beneficial combination of reflected and transmitted waves. The design of the isolator is to generally provide a bandstop filter function, thereby aiding the frequency isolation of an acoustic transmitter over a passband that may be constrained by the geometry of drill pipe or components of production tubing. It causes substantially all of the emitted wave energy to travel in a chosen direction along the drill pipe, thus aiding the efficiency of acoustic telemetry in the pipe.
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公开(公告)号：CA2628997A1
公开(公告)日：2008-10-13
申请号：CA2628997
申请日：2008-04-11
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： NEFF JAMES M , CAMWELL PAUL L , LOGAN DEREK W
IPC: E21B47/12
Abstract: A method is provided which transmits information using a plurality of data transmission nodes situated along a drill string. In this method, a first node obtains a transmission status of a second node. When the transmission status of the second node indicates that the second node meets a selected performance threshold, information is sent from the first node to the second node. When the transmission status of the second node indicates that the second node does not meet its performance threshold, then the first node obtains a transmission status of a third node. When the transmission status of the third node indicates that the third node meets a selected performance threshold, information is transmitted from the first node to the third node for relaying along the drill string.
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