Carl F Robbins

US Patent:

6400646, Jun 4, 2002

Filed:

Dec 9, 1999

Appl. No.:

09/457996

Inventors:

Vimal V. Shah - Houston TX
John W. Minear - Houston TX
Robert Malloy - Katy TX
James R. Birchak - Spring TX
Wallace R. Gardner - Houston TX
Carl Robbins - Tomball TX

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

H04H 900

US Classification:

367 82, 367 83, 367 79, 368 46

Abstract:

A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The system determines the time of arrival of each acoustic signal by analyzing the shape of a function of the acoustic signal chosen from a group of functions suitable to determine a clock offset with millisecond accuracy.

US Patent:

7212075, May 1, 2007

Filed:

Jul 18, 2003

Appl. No.:

10/622557

Inventors:

David J. Young - Houston TX, US
Carl A. Robbins - Houston TX, US
Eugene Linyaev - Houston TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

H03B 5/32

US Classification:

331176, 331 2, 331158

Abstract:

A downhole crystal-based clock that is substantially insensitive to the factors that may cause frequency deviation as a result of downhole temperature. The clock may include a plurality of crystals, where a first crystal may be more stable, with respect to temperature, than a second crystal. The crystals may be thermally coupled together so that they may have substantially the same temperature. An error detector may monitor the differences between the frequencies associated with each crystal and provide this information to a storage device. This information may be determined prior to deploying the clock downhole. When deployed downhole, the signal from the error detector may be interpreted in light of the information in the storage device to provide a temperature measurement of the two crystals. The downhole temperature measurement then may be used to reduce frequency deviations in the downhole clock that may result from downhole temperatures.

US Patent:

8193946, Jun 5, 2012

Filed:

Nov 10, 2006

Appl. No.:

12/065529

Inventors:

Sinan Sinanovic - Sarajavo, BA
Donald H. Johnson - Houston TX, US
Wallace R. Gardner - The Woodlands TX, US
Li Gao - Missouri TX, US
Carl A. Robbins - Houston TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

H04H 9/00

US Classification:

3408554, 367 82

Abstract:

Acoustic telemetry devices and methods that provide directional detection. In one embodiment, a disclosed acoustic telemetry device comprises at least two acoustic sensors and an electronics module. The electronics module combines the detection signals from the acoustic sensors to obtain a combined signal that substantially excludes signals propagating in a direction opposite to the communication signal. The disclosed systems and methods can be trained in the field and will readily accommodate an irregular and unknown signal transmission medium between the two acoustic sensors.

US Patent:

8634273, Jan 21, 2014

Filed:

Oct 26, 2009

Appl. No.:

12/605979

Inventors:

Wallace R. Gardner - Houston TX, US
Vimal V. Shah - Sugarland TX, US
Carl A. Robbins - Tomball TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

E21B 47/16

US Classification:

367 82, 367 81

Abstract:

An embodiment includes a method comprising transmitting and receiving an acoustic signal that is modulated along a jointed tubing. The acoustic signal may be transmitted in multiple passbands of the jointed tubing and may be modulated differently in different passbands. A swept frequency signal may be used to determine transmission characteristics of the jointed tubing and to select the multiple passbands. Additional embodiments are disclosed.

US Patent:

20060114746, Jun 1, 2006

Filed:

Nov 29, 2004

Appl. No.:

10/998974

Inventors:

Wallace Gardner - Houston TX, US
Vimal Shah - Sugarland TX, US
Carl Robbins - Tomball TX, US

International Classification:

H04H 9/00

US Classification:

367082000

Abstract:

An embodiment includes a method comprising receiving an acoustic signal that is modulated along a jointed tubing. The method also includes performing equalization over a passband of the acoustic signal to generate an equalized signal.

US Patent:

20100039286, Feb 18, 2010

Filed:

Aug 18, 2008

Appl. No.:

12/193525

Inventors:

Carl A. ROBBINS - Houston TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

G01V 3/00
H04L 27/28

US Classification:

3408553, 375260

Abstract:

Enhanced symbol synchronization methods suitable for use in narrowband orthogonal frequency division multiplexed (OFDM) telemetry systems. In at least some embodiments, a logging while drilling (LWD) tool assembly communicates with the surface using low frequency electromagnetic (EM) signals. The telemetry transmitter employs OFDM modulation to fully exploit the narrow range of available bandwidth, resulting in signals that have relatively long frames. At the surface a receiver digitizes the receive signal and applies an enhanced symbol synchronization technique to identify frame boundaries before demodulation is attempted. The enhanced symbol synchronization technique employs a pulse train filter to clean up a cyclic prefix correlation signal that otherwise behaves badly in the narrowband regime. The improved timing information from the enhanced symbol synchronization significantly reduces the error rate in the demodulated signal.

US Patent:

20100182161, Jul 22, 2010

Filed:

Apr 28, 2007

Appl. No.:

12/090105

Inventors:

Carl A. Robbins - Houston TX, US
Eugene Linyaev - Houston TX, US
Li Gao - Missouri MO, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

G01V 3/00

US Classification:

3408537

Abstract:

Various electromagnetic LWD telemetry systems are disclosed having a wireless repeater positioned on or near the seabed. The wireless repeater receives and demodulates electromagnetic uplink signals and retransmits the uplink signals from the seabed as electromagnetic or acoustic signals. A receiver on the drilling platform or suspended from the water's surface receives the uplink signal and forwards it to a facility for processing and storage. In some embodiments, the wireless repeater takes the form of a sub threaded inline with the drill string with an electromagnetic signal sensor positioned inside the drill string. In other embodiments, the wireless repeater takes the form of a unit that rests on the seabed with electromagnetic signal sensors inserted into the sea bottom.

US Patent:

20110164468, Jul 7, 2011

Filed:

Aug 13, 2009

Appl. No.:

12/918552

Inventors:

Carl A. Robbins - Houston TX, US
Li Gao - Katy TX, US

Assignee:

HALLIBURTON ENERGY SERVICES, INC. - Houston TX

International Classification:

E21B 47/16
G01V 1/40

US Classification:

367 82, 367 81

Abstract:

Transmitting acoustic signals from a wellbore. At least some of the illustrative embodiments are methods including transmitting an acoustic signal comprising downhole data, receiving the acoustic signal (the receiving by a receiver disposed within the internal diameter of a casing in the wellbore) converting the acoustic signal to a corresponding first electromagnetic signal, and inducing a second electromagnetic signal in a tubing responsive to the first electromagnetic signal.