公开(公告)号：CA2628997C

公开(公告)日：2015-11-17

申请号：CA2628997

申请日：2008-04-11

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  NEFF JAMES M ,  LOGAN DEREK W

IPC: E21B47/12

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.

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：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

公开(公告)号：CA2584841A1

公开(公告)日：2007-10-19

申请号：CA2584841

申请日：2007-04-12

Applicant: XACT DOWNHOLE TELEMETRY INC

Inventor： CAMWELL PAUL L ,  NEFF JAMES M ,  DRUMHELLER DOUGLAS S

IPC: E21B47/16 ,  E21B47/12 ,  G01H1/08

Abstract: Non-contacting means of measuring the material velocities of harmonic acoust ic 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 m ay 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 spac e- constrained situations. The invention also teaches a substantially contactle ss 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 drilling environments.

公开(公告)号：CA2569818A1

公开(公告)日：2007-06-05

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

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 multipl e 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 reflecto r 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 possibl e deleterious interference.