-
公开(公告)号：EP2972527A2
公开(公告)日：2016-01-20
申请号：EP14762714.5
申请日：2014-03-17
Applicant: Xact Downhole Telemetry, Inc.
Inventor： VAN ZELM, John-Peter
Abstract: A telemetry system produces, transmits and receives signal sets from network nodes, which correspond to transceiver stations. Repeater scheduling and other interference mitigating techniques are utilized to simultaneously transmit from multiple nodes with minimized network degradation. Update interval/rate and network throughput are thereby fixed regardless of the number of network nodes and a network telemetry method is provided using the system.
-
公开(公告)号：NO20181284A1
公开(公告)日：2018-10-04
申请号：NO20181284
申请日：2018-10-04
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： MCRORY JOHN GODFREY
Abstract: Methods, systems, and techniques for controlling voltage applied across a piezoelectric stack of a downhole acoustic transmitter. At least one of the temperature of the stack and the compressive stress applied to the stack is monitored. At least one of the temperature of the stack and the compressive stress applied to the stack is compared to a temperature threshold and a stress threshold, respectively. When the stack signal is an alternating voltage signal and when at least one of the temperature of the stack and the compressive stress applied to the stack respectively exceeds the temperature threshold and the stress threshold, the stack signal is modified such that a negative polarity portion of the stack signal has a maximum magnitude less than a magnitude of a negative polarity limit.
-
63.发明专利
公开(公告)号：CA3030368A1
公开(公告)日：2018-01-18
申请号：CA3030368
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
Abstract: A downhole acoustic transmitter has a pre-loaded piezoelectric transducer, an enclosure in which the piezoelectric transducer is housed, a preload spring that biases the transducer against a first end coupling of the enclosure, and an adjustable preload means mounted to the enclosure such that a selected compressive force is applied to the preload spring, which in turn urges the transducer against a face of the first end coupling such that a mechanical preload is applied to the transducer. The position of the adjustable preload means and the spring compliance are selected so that the level of mechanical preload applied to the transducer compensates for an expected amount of flexing of the acoustic telemetry transmitter due to varying tension and compression applied to the transmitter, thereby maintaining an effective preload on the transducer.
-
公开(公告)号：BR112015018861A2
公开(公告)日：2017-07-18
申请号：BR112015018861
申请日：2014-02-07
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： JOHN GODFREY MCRORY
Abstract: 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. ____________ tradução do resumo resumo patente de invenção: "transmissor acústico para transmitir um sinal através de um meio de fundo de poço". a presente invenção refere-se a um transmissor acústico para transmitir um sinal acústico através de um meio de fundo de poço, que inclui uma fonte de tensão, uma carga composta, e circuitos de comutação que aplica tensão da fonte de tensão através da carga composta em resposta a um sinal de acionamento. a carga composta inclui circuitos de controle de carga, na forma de pelo menos um indu-tor, conectados eletricamente em série com um transdutor piezelétrico que pode ser eletricamente moldado como um capacitor.
-
公开(公告)号：CA2941558A1
公开(公告)日：2015-09-11
申请号：CA2941558
申请日：2014-03-06
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： VAN ZELM JOHN-PETER
Abstract: A downhole repeater network timing system for a drilling rig including a drillstring extending subsurface downwardly from a surface wellhead. The system includes a node located at the drillstring lower end and including a sensor adapted for providing a signal data set output corresponding to downhole drilling conditions. Multiple nodes are located downhole between the Bottom Hole Assembly (BHA) and the wellhead and are associated with the drillstring. The nodes are adapted for receiving and transmitting the signals. The timing control system is adapted for controlling all times within a timeframe according to pre-configured constants known to all nodes. A downhole low rate linear repeater network timing method uses the system.
-
Patent Agency Ranking
公开(公告)号：CA2585044C
公开(公告)日：2013-09-17
申请号：CA2585044
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , SIEMENS WENDALL L , LOGAN DEREK W
Abstract: A system and method of closed loop control whereby acoustic telemetry devices, both at surface and downhole, form nodes of a feedback loop; said feedback loop enables an automatic and dynamic means to modify transmission parameters such that the system's telemetry data rate is maximized consistent with minimum achievable signal-to-noise ratio and minimum expended power.
-
公开(公告)号：CA2585046C
公开(公告)日：2011-09-13
申请号：CA2585046
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , SENDYK ANDRZEJ M , HILDEBRANDT EDWIN I
Abstract: This invention applies to the means whereby capacitance changes due to varying temperature and/or pressure in a piezoelectric transducer used for acoustic telemetry in a drilling environment is dynamically offset by modifying one or 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.
-
公开(公告)号：CA2585007C
公开(公告)日：2011-07-12
申请号：CA2585007
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC , EXTREME ENGINEERING LTD
Inventor： CAMWELL PAUL L , NEFF JAMES M
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.
-
公开(公告)号：CA2585044A1
公开(公告)日：2007-10-11
申请号：CA2585044
申请日：2007-04-10
Applicant: XACT DOWNHOLE TELEMETRY INC
Inventor： CAMWELL PAUL L , LOGAN DEREK W , SIEMENS WENDALL L
Abstract: A system and method of closed loop control whereby acoustic telemetry device s, both at surface and downhole, form nodes of a feedback loop; said feedback loop enables an automatic and dynamic means to modify transmission parameters such that the system's telemetry data rate is maximized consisten t with minimum achievable signal-to-noise ratio and minimum expended power.
-
公开(公告)号：EP2954161B1
公开(公告)日：2018-09-12
申请号：EP14749094.0
申请日：2014-02-07
Applicant: Xact Downhole Telemetry, Inc.
Inventor： MCRORY, John Godfrey
CPC classification number: E21B47/16 , B06B1/0215 , B06B2201/55 , B06B2201/73 , E21B47/14
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.
-
-
-
-
-
-
-
-
-
Search Results
101
records
(took 0.019 seconds)
