公开(公告)号：CA2718118A1

公开(公告)日：2007-10-11

申请号：CA2718118

申请日：2007-04-10

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： NEFF JAMES M ,  CAMWELL PAUL L

IPC: E21B47/12 ,  E21B47/16 ,  E21B47/18

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：CA2585007A1

公开(公告)日：2007-10-11

申请号：CA2585007

申请日：2007-04-10

Applicant: EXTREME ENGINEERING LTD ,  XACT DOWNHOLE TELEMETRY INC

Inventor： NEFF JAMES M ,  CAMWELL PAUL L

IPC: E21B47/12 ,  E21B47/16 ,  E21B47/18

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：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：US20180363457A1

公开(公告)日：2018-12-20

申请号：US16115221

申请日：2018-08-28

Applicant: XACT DOWNHOLE TELEMETRY, INC

Inventor： John-Peter van Zelm

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

公开(公告)号：US20160017704A1

公开(公告)日：2016-01-21

申请号：US14771777

申请日：2014-02-28

Applicant: XACT Downhole Telemetry Inc.

Inventor： Paul Camwell ,  Michael Reeves

IPC: E21B47/09 ,  G01V5/04 ,  E21B33/12

CPC classification number: E21B47/09 ,  E21B33/12 ,  E21B47/044 ,  G01V5/045

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.

Abstract translation: 一种用于检测井眼中的井下位置的方法，包括：提供一组信号发射器，该组中的每个信号发射器附接到井眼中的不同位置，并且每个信号发射器被配置为发射具有独特特征的信号; 以及提供测量工具，其包括被配置为检测不同信号的信号检测器和被配置为可旋转地接触井眼的壁的旋转装置。 通过检测一个或多个信号并且通过每个检测信号的唯一特性来识别一个或多个信号发射器的位置来确定测量工具通过井眼移动并且测量工具在井眼中的一个或多个位置 并且通过检测与井眼接触的旋转检测器的测距轮中的旋转数。

公开(公告)号：US20140153369A1

公开(公告)日：2014-06-05

申请号：US14094417

申请日：2013-12-02

Applicant: Xact Downhole Telemetry, Inc.

Inventor： John-Peter van Zelm

IPC: E21B47/16

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.

Abstract translation: 一种用于钻机的井下中继器网络定时系统，其包括从表面井口向下延伸的钻柱。 该系统包括位于钻柱下端的节点，并且包括适于提供对应于井下钻井条件的信号数据组输出的传感器。 多个节点位于底孔组件（BHA）和井口之间的井下，并与钻柱相关联。 节点适于接收和发送信号。 时序控制系统适用于根据所有节点已知的预先配置的常数在一段时间内控制所有时间。 井下低速线性中继器网络定时方法使用该系统。

公开(公告)号：SA519401563B1

公开(公告)日：2022-06-21

申请号：SA519401563

申请日：2019-04-13

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： XIAOJUN XIAO ,  JOHN-PETER VAN ZELM ,  JOHN GODFREY MCRORY

Abstract: يتعلقالاختراعالحاليبجهازإرسالصوتيأسفلالبئر downhole acoustic transmitter يشتملعلىمحولطاقةكهربائيإجهادي piezoelectric transducer،غلاف enclosure يحويمحولالطاقةالكهربائيالإجهادي،وسيلةتحميلمسبقلمحولالطاقةوالتيتسلطقوةانضغاطمنتقاةعلىمحولالطاقةبحيثيتمتسليطتحميلميكانيكيمسبقعلىمحولالطاقة،وعنصرضبطصوتيلهطرفأولمقترنبوسيلةالتحميلالمسبقلمحولالطاقةأومحولالطاقة،وطرقثانٍمفتوح. ولايتمإقرانعنصرالضبطالصوتيبأيشيءبخلافوسيلةالتحميلالمسبقلمحولالطاقةأومحولالطاقة،وبالتاليتكونوسيلةالتحميلالمسبقلمحولالطاقةعلىنحوٍفعالبطرفثانٍمفتوحومنثميمكنأنتحافظعلىنفسقوةالانضغاطالخاصةبالتحميلالمسبقعلىمحولالطاقةحتىعندإخضاعجهازالإرسالإلىقوىالشدوالانضغاطأثناءالتشغيل. [الشكل 2]

公开(公告)号：CA2902761C

公开(公告)日：2021-10-12

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.