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公开(公告)号：CA2906215C
公开(公告)日：2021-01-19
申请号：CA2906215
申请日：2014-03-17
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： VAN ZELM JOHN-PETER , MARTINEAU CELINE J
Abstract: A robust network telemetry repeater system exploits the repeater structure of data propagation and transmission and reception bidirectionality to increase network robustness. For example, multiple perceived receive attempts are created with no additional overhead. The system can be configured whereby nodes "hear" the transmissions of both adjacent and non- adjacent nodes forming implicit acknowledgement ("Acks"), and originating nodes can retransmit until implicit acknowledgments ("Acks") are "heard," indicating a successful link relay. Implicit acknowledgment can be applied to bidirectional networks, and bidirectional action can enable all nodes in the network to know the status of all other nodes.
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52.发明专利
公开(公告)号：BR112012026721A2
公开(公告)日：2018-05-29
申请号：BR112012026721
申请日：2011-04-14
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： DAVID D WHALEN , PAUL L CAMWELL
IPC: G01V3/00
Abstract: dispositivo e método de autoalinhamento para sub de vão eletromagnético de rosca afunilada. trata-se de um sub de vão em geralmente de três partes compreendendo um primeiro cilindro condutor que incorpora uma seção rosqueada afunilada macho, um segundo cilindro condutor que incorpora uma seção rosqueada afunilada fêmea, ambos alinhados axialmente e rosqueados entre si é descrito. um ou ambos os afunilamentos incorporam fendas por meio de que insertos não condutores podem ser colocados antes do conjunto dos cilindros. os insertos são projetados para fazer com que as raízes de rosca, cristais e laterais das seções afuniladas de ambos os cilindros sejam espacialmente separadas. os cilindros podem ser significativamente torqueados, um no outro, ao passo que se mantém uma separação anular e, portanto, uma separação elétrica como parte do procedimento de montagem. os cilindros coaxiais counidos podem ser colocados dentro de uma máquina de moldagem por injeção em que um termoplástico de alto desempenho é injetado no interior do espaço anular, desse modo formando um vão isolante ( a terceira parte) e uma junta forte entre os cilindros no recém-criado sub de vão em.
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公开(公告)号：CA2796261C
公开(公告)日：2017-01-03
申请号：CA2796261
申请日：2011-04-14
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , WHALEN DAVID D
Abstract: A generally three-part EM gap sub comprising a first conductive cylinder incorporating a male tapered threaded section, a second conductive cylinder incorporating female tapered threaded section, both axially aligned and threaded into each other is described. One or both tapers incorporate slots whereby non-conductive inserts may be placed before assembly of the cylinders. The inserts are designed to cause the thread roots, crests and sides of the tapered sections of both cylinders to be spatially separated. The cylinders can be significantly torqued, one into the other, while maintaining an annular separation and therefore electrical separation as part of the assembly procedure. The co-joined coaxial cylinders can be placed into an injection moulding machine wherein a high performance thermoplastic is injected into the annular space, thereby forming both an insulative gap (the third part) and a strong joint between the cylinders in the newly created EM gap sub.
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公开(公告)号：CA2900094A1
公开(公告)日：2014-08-14
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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公开(公告)号：CA2726695C
公开(公告)日：2013-08-06
申请号：CA2726695
申请日：2007-04-12
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , NEFF JAMES M , DRUMHELLER DOUGLAS S
IPC: E21B47/16
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 drifting environments.
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Patent Agency Ranking
公开(公告)号：CA2691410C
公开(公告)日：2013-04-02
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：CA2765605A1
公开(公告)日：2010-12-23
申请号：CA2765605
申请日：2010-06-15
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L
Abstract: A system and method of optimizing air hammer performance in a well drilling rig whereby an electronic acoustic receiver (EAR) is used to monitor the effects of changing any of the operating parameters under his or her control. The signals are visually presented to the drill operator based on an EAR's output, along with current settings, allowing the drill operator to dial in the parameters of his or her choice until the optimal frequency of the air hammer is regained. The visual output displays the amplitude response of acoustic waves being detected and decoded at the surface by the EAR. The drill operator can observe and use this information to determine the changes necessary in the operating parameters to return the hammer to optimal frequency, and thus optimal performance.
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58.发明公开
公开(公告)号：EP3482044A1
公开(公告)日：2019-05-15
申请号：EP17826717.5
申请日：2017-07-07
Applicant: Xact Downhole Telemetry, Inc.
Inventor： XIAO, Xiaojun , WHALEN, Dave , VAN ZELM, John-Peter , MCRORY, John Godfrey
IPC: E21B47/14
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公开(公告)号：EP2961925B1
公开(公告)日：2019-05-01
申请号：EP14756385.2
申请日：2014-02-28
Applicant: Xact Downhole Telemetry, Inc.
Inventor： CAMWELL, Paul , REEVES, Michael
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公开(公告)号：EP3114317A4
公开(公告)日：2017-11-01
申请号：EP14884471
申请日：2014-03-06
Applicant: XACT DOWNHOLE TELEMETRY INC , VAN ZELM JOHN-PETER
Inventor： VAN ZELM JOHN-PETER
IPC: E21B47/12
CPC classification number: E21B47/18 , E21B47/122 , E21B47/16
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