公开(公告)号：CA2906905A1

公开(公告)日：2014-09-18

申请号：CA2906905

申请日：2014-03-17

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： VAN ZELM JOHN-PETER

IPC: G02B6/02 ,  G08B3/00 ,  G08B3/10

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：CA2906215A1

公开(公告)日：2014-09-18

申请号：CA2906215

申请日：2014-03-17

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： VAN ZELM JOHN-PETER ,  MARTINEAU CELINE J

IPC: G01V3/18

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.

公开(公告)号：CA2765605C

公开(公告)日：2013-10-22

申请号：CA2765605

申请日：2010-06-15

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  NEFF JAMES

IPC: E21B44/08 ,  E21B1/32 ,  E21B4/14 ,  E21B47/14

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.

公开(公告)号：CA2569818C

公开(公告)日：2013-08-13

申请号：CA2569818

申请日：2006-12-01

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： DRUMHELLER DOUGLAS S ,  CAMWELL PAUL L ,  DOPF ANTHONY R ,  LOGAN DEREK W

IPC: G10K11/16 ,  G10K11/18 ,  G10K11/20

Abstract: An acoustic isolator for use with tubular assemblies such as drillpipe or production tubing comprising an acoustic wave transmitter, the acoustic isolator comprising, in series, an odd integer ~/4 multiple tuning bar of first acoustic impedance adjacent the acoustic wave transmitter, an odd integer ~/4 multiple reflector tube of second acoustic impedance, and a snubber of third acoustic impedance, wherein there is an acoustic impedance mismatch between the odd integer ~/4 multiple tuning bar and the odd integer ~/4 multiple reflector tube and an acoustic impedance mismatch between the odd integer ~/4 multiple reflector tube and snubber, 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. 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.

公开(公告)号：CA2796261A1

公开(公告)日：2011-10-27

申请号：CA2796261

申请日：2011-04-14

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  WHALEN DAVID D

IPC: G01V3/00

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.

公开(公告)号：CA2585000C

公开(公告)日：2011-04-05

申请号：CA2585000

申请日：2007-04-10

Applicant: XACT DOWNHOLE TELEMETRY INC ,  EXTREME ENGINEERING LTD

Inventor： CAMWELL PAUL L ,  NEFF JAMES M

IPC: E21B47/12 ,  E21B47/06 ,  E21B47/16

Abstract: A method whereby a downhole drilling transmission device that communicates to 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 received at surface within required parameters, thus offsetting the degradation due to increasing attenuation.

公开(公告)号：CA2714984A1

公开(公告)日：2011-03-21

申请号：CA2714984

申请日：2010-09-21

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL ,  NEFF JAMES

IPC: E21B47/10

Abstract: An invention is claimed wherein the signal loss along steel drill pipe walls can be estimated in the absence of a loss mechanism due to the formation debris at various positions in the well bore; the signal loss in excess of the calculated attenuation is generally and directly attributable to the build-up of said formation debris and an estimation of the amount can be determined. Furthermore, by use of distributed acoustic nodes positioned in the well between the transmitter in the BHA and the surface receiver - configured as repeaters - the formation debris build-up can be determined in each section so defined. This new information enables the driller to implement hole cleaning means in a timely manner and as appropriate, thus avoiding the problems of getting stuck in the hole, and possible well abandonment. An extension of the method enables the hole cleaning process to be automated, thereby improving efficiency.

公开(公告)号：CA2692937A1

公开(公告)日：2010-08-13

申请号：CA2692937

申请日：2010-02-15

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  WHALEN DAVID D ,  DRUMHELLER DOUGLAS S

IPC: E21B47/16 ,  G10K11/24

公开(公告)号：CA2692907A1

公开(公告)日：2010-08-12

申请号：CA2692907

申请日：2010-02-12

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  WHALEN DAVID D ,  MCRORY JOHN G ,  NEFF JAMES M

IPC: E21B47/022 ,  E21B47/12

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.

公开(公告)号：CA2726695A1

公开(公告)日：2007-10-19

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