公开(公告)号：US10060255B2

公开(公告)日：2018-08-28

申请号：US15285367

申请日：2016-10-04

Applicant: XACT Downhole Telemetry, Inc.

Inventor： John-Peter van Zelm

IPC: E21B47/16 ,  E21B47/12 ,  E21B17/00 ,  E21B17/02 ,  G01V1/26 ,  E21B17/20 ,  E21B43/04 ,  E21B43/26

CPC classification number: E21B47/122 ,  E21B17/003 ,  E21B17/028 ,  E21B17/20 ,  E21B43/04 ,  E21B43/26 ,  E21B47/12 ,  E21B47/16 ,  G01V1/26

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.

公开(公告)号：US08393412B2

公开(公告)日：2013-03-12

申请号：US12704368

申请日：2010-02-11

Applicant: Paul L. Camwell ,  John G. McRory ,  David D. Whalen ,  James M. Neff

Inventor： Paul L. Camwell ,  John G. McRory ,  David D. Whalen ,  James M. Neff

IPC: E21B47/022

CPC classification number: E21B47/02208

Abstract: A system and method of closed loop control whereby groupings of surface sonic transmitters disposed along the planned path of a well send sonic wave energy to a downhole sonic receiver (or alternatively a downhole sonic transmitter signalling to grouping of surface sonic receivers) in a manner that facilitates the downhole positioning of the well. Subsequent offset well positioning, relative to the first well, may be achieved in a similar manner.

Abstract translation: 闭环控制的系统和方法，其中沿着井的规划路径布置的表面声波发射器的分组将声波能量发送到井下声波接收器（或者替代地，井下声波发射器发信号通知表面声波接收机的分组），其方式为 有助于井的井下定位。 可以以类似的方式实现相对于第一井的后续偏移井定位。

公开(公告)号：US08022840B2

公开(公告)日：2011-09-20

申请号：US12878858

申请日：2010-09-09

Applicant: Paul L. Camwell ,  James M. Neff

Inventor： Paul L. Camwell ,  James M. Neff

IPC: G01V3/00

CPC classification number: E21B47/16

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.

Abstract translation: 一种用于增强井下遥测性能的方法，包括增强信号以便随着测量深度的增加来抵消信噪比的降低，其中在由声波速度确定推断出的指定测量深度处修改信号。

公开(公告)号：US07872945B2

公开(公告)日：2011-01-18

申请号：US11786643

申请日：2007-04-11

Applicant: Paul L. Camwell ,  Edwin I. Hildebrandt ,  Andrzej M. Sendyk

Inventor： Paul L. Camwell ,  Edwin I. Hildebrandt ,  Andrzej M. Sendyk

IPC: E21B47/16

CPC classification number: E21B47/16

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.

Abstract translation: 本发明适用于通过修改与所述换能器的驱动或控制电路相关联的一个或多个参数来动态地抵消由于在钻井环境中用于声学遥测的压电换能器中由于温度和/或压力变化引起的电容变化的装置。 本发明的目的是将换能器紧密地保持在谐振模式，从而确保最佳的能量消耗。

公开(公告)号：US20110006910A1

公开(公告)日：2011-01-13

申请号：US12878858

申请日：2010-09-09

Applicant: Paul L. Camwell ,  James M. Neff

Inventor： Paul L. Camwell ,  James M. Neff

IPC: G01V3/00

CPC classification number: E21B47/16

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.

Abstract translation: 一种用于增强井下遥测性能的方法，包括增强信号以便随着测量深度的增加来抵消信噪比的降低，其中在由声波速度确定推断出的指定测量深度处修改信号。

公开(公告)号：US20080253228A1

公开(公告)日：2008-10-16

申请号：US12082530

申请日：2008-04-11

Applicant: Paul L. Camwell ,  James M. Neff ,  Derek W. Logan

Inventor： Paul L. Camwell ,  James M. Neff ,  Derek W. Logan

IPC: E21B47/16

CPC classification number: E21B47/12 ,  H04L67/12 ,  H04W40/10 ,  H04W40/12 ,  H04W40/22 ,  Y02D70/326 ,  Y02D70/34 ,  Y02D70/39

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.

Abstract translation: 提供了使用沿着钻柱定位的多个数据传输节点发送信息的方法。 在该方法中，第一节点获得第二节点的传输状态。 当第二节点的传输状态指示第二节点满足所选择的性能阈值时，从第一节点向第二节点发送信息。 当第二节点的传输状态指示第二节点不满足其性能阈值时，第一节点获得第三节点的传输状态。 当第三节点的传输状态指示第三节点满足所选择的性能阈值时，信息从第一节点发送到第三节点，以沿着钻柱中继。

公开(公告)号：US20080025148A1

公开(公告)日：2008-01-31

申请号：US11786643

申请日：2007-04-11

Applicant: Paul Camwell ,  Edwin Hildebrandt ,  Andrzej Sendyk

Inventor： Paul Camwell ,  Edwin Hildebrandt ,  Andrzej Sendyk

IPC: E21B47/16 ,  H04R17/00

CPC classification number: E21B47/16

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.

Abstract translation: 本发明适用于通过修改与所述换能器的驱动或控制电路相关联的一个或多个参数来动态地抵消由于在钻井环境中用于声学遥测的压电换能器中由于温度和/或压力变化引起的电容变化的装置。 本发明的目的是将换能器紧密地保持在谐振模式，从而确保最佳的能量消耗。

公开(公告)号：US20190301280A1

公开(公告)日：2019-10-03

申请号：US16316848

申请日：2017-07-07

Applicant: XACT Downhole Telemetry Inc.

Inventor： Xiaojun Xiao ,  Dave Whalen ,  John-Peter Van Zelm ,  John Godfrey McRory

IPC: E21B47/16

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：US09797241B2

公开(公告)日：2017-10-24

申请号：US14766421

申请日：2014-02-07

Applicant: XACT Downhole Telemetry Inc.

Inventor： John Godfrey McRory

IPC: E21B47/16 ,  E21B47/14 ,  B06B1/02

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.

公开(公告)号：US09458712B2

公开(公告)日：2016-10-04

申请号：US14660833

申请日：2015-03-17

Applicant: XACT Downhole Telemetry, Inc.

Inventor： Paul L. Camwell ,  David D. Whalen ,  Douglas S. Drumheller

IPC: E21B47/12 ,  E21B47/14 ,  E21B47/16 ,  G01V11/00 ,  G10K11/16 ,  G10K11/162 ,  G10K11/168

CPC classification number: E21B47/16 ,  E21B47/12 ,  E21B47/14 ,  G01V11/002 ,  G10K11/16 ,  G10K11/162 ,  G10K11/168

Abstract: A stacked-ring, slow-wave acoustic telemetry isolation system and method for use with tubular assemblies such as drillpipe or production tubing comprising an acoustic wave transmitter, the acoustic isolator behaving such that 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. 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. 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 said pipe.