Allen R Davis

US Patent:

6450037, Sep 17, 2002

Filed:

Jun 25, 1999

Appl. No.:

09/344093

Inventors:

Rebecca S. McGuinn - Middletown CT
Daniel L. Gysling - Glastonbury CT
Charles R. Winston - Glastonbury CT
Allen R. Davis - Glastonbury CT
John M. Faustino - Hamden CT

Assignee:

CiDRA Corporation - Wallingford CT

International Classification:

G01L 900

US Classification:

73705, 25022719, 25023119

Abstract:

Non-intrusive pressure sensors for measuring unsteady pressures within a pipe include an optical fiber wrapped in coils around the circumference of the pipe. The length or change in length of the coils is indicative of the unsteady pressure in the pipe. Bragg gratings impressed in the fiber may be used having reflection wavelengths that relate to the unsteady pressure in the pipe. One or more of sensors may be axially distributed along the fiber using wavelength division multiplexing and/or time division multiplexing.

US Patent:

6501067, Dec 31, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/726060

Inventors:

Richard T. Jones - Hamden CT
Allen R. Davis - Falls Church VA
John M. Faustino - East Haven CT

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G01J 104

US Classification:

25022714, 25022716, 25022723, 25022725, 73705, 285 13

Abstract:

An apparatus for non-intrusively sensing fluid flow within a pipe is provided. The apparatus includes an array of sensors that include a plurality of optical fiber coils. The array of sensors senses the fluid flow inside the pipe. At least one optical reflective device is disposed between adjacent optical fiber coils. An isolation pad is disposed between each optical reflective device and the pipe.

US Patent:

6558036, May 6, 2003

Filed:

Nov 29, 2000

Appl. No.:

09/726062

Inventors:

Daniel L. Gysling - Glastonbury CT
Richard T. Jones - Hamden CT
Allen R. Davis - Falls Church VA

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G01K 108

US Classification:

374147, 374136, 374161

Abstract:

An apparatus for sensing the temperature of a fluid being drawn from a well includes a pipe having a wall, a sensor mounted on the outer surface of the pipe wall, an insulator, and a housing attached to the pipe that encloses the sensor and the insulator. The fluid to be sensed is drawn from the well through the pipe. The thermal conductivity of the pipe wall is greater than that of the insulator.

US Patent:

6601671, Aug 5, 2003

Filed:

Jul 10, 2000

Appl. No.:

09/612775

Inventors:

Xiaomin Zhao - Sugarland TX
Francis X. Bostick - Houston TX
Jian-Qun Wu - Houston TX
Daniel L. Gysling - Glastonbury CT
Peter C. Ogle - Charlestown RI
Allen R. Davis - Glastonbury CT
Alan D. Kersey - South Glastonbury CT
Bob A. Hardage - Austin TX

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G10K 1100

US Classification:

181108, 181122, 356 32

Abstract:

The present invention provides a new and unique method, sensor, and apparatus for performing a seismic survey of an earth formation in relation to a borehole. The method includes arranging at least one strain seismic sensor in conjunction with a borehole structure, and mechanically coupling the borehole structure to the borehole to allow seismic data to be accurately transferred to the sensor. The sensor is preferably a fiber optic sensor, including a Fiber Bragg Grating which may be coupled to a relevant borehole structure in a number of ways.

US Patent:

6782150, Aug 24, 2004

Filed:

Nov 29, 2000

Appl. No.:

09/740760

Inventors:

Allen R. Davis - Falls Church VA
Daniel L. Gysling - Glastonbury CT
Charles R. Winston - Glastonbury CT
John M. Faustino - East Haven CT
Rebecca S. McGuinn - Middlefield CT

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G02B 600

US Classification:

385 12, 385 13, 7317001, 7317006, 7317011, 7317013, 7317014, 7315251, 7386118, 7386123

Abstract:

An apparatus for non-intrusively sensing fluid flow within a pipe is provided. The apparatus includes a first sensing array for sensing acoustic signals traveling at the speed of sound through fluid flow within the pipe, a second sensing array for sensing local pressure variations traveling with the fluid flow, and a housing attached to the pipe for enclosing the sensing arrays. The first sensing array includes a plurality of first optical pressure sensors and the second sensing array includes a plurality of second optical pressure sensors.

US Patent:

6785004, Aug 31, 2004

Filed:

Nov 29, 2000

Appl. No.:

09/726059

Inventors:

Alan D. Kersey - South Glastonbury CT
Allen R. Davis - Falls Church VA
Mark R. Fernald - Enfield CT
Charles R. Winston - Glastonbury CT
Timothy J. Bailey - Longmeadow MA

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G01B 902

US Classification:

356478, 356 355, 356477, 385 12, 385 13

Abstract:

An apparatus and method for interrogating fiber optic sensors non-intrusively sensing fluid flow within a pipe is provided. The apparatus includes a two-beam interferometer which comprises an optical circuit for generating a series of discrete light pulses that are directed at sensors positioned between pairs of low reflectivity fiber Bragg gratings. The successive light pulses are split into first light pulses and second light pulses, and the second light pulses are delayed a known time period relative to the first pulses. The first and second light pulses are combined onto a single optical fiber and directed through the low reflectivity gratings and the sensors positioned between the gratings. Reflected pulses from the series of pulses impinge on a photo receiver and interrogator, wherein the phase shift between the reflected first light pulses from a particular grating and the reflected second light pulses from the preceding grating, for each sensor are determined. Phase shifts from successive pulses for each sensor are compared, and a change in a measured parameter of the fluid is determined.

US Patent:

6959604, Nov 1, 2005

Filed:

Aug 21, 2002

Appl. No.:

10/224821

Inventors:

Rebecca S. Bryant - Glastonbury CT, US
Daniel L. Gysling - Glastonbury CT, US
Charles R. Winston - Glastonbury CT, US
Allen R. Davis - Falls Church VA, US
John M. Faustino - Hamden CT, US

Assignee:

CiDRA Corporation - Wallingford CT

International Classification:

G01L009/00

US Classification:

73705

Abstract:

A fiber optic pressure sensor for measuring unsteady pressures within a pipe include at least one optical fiber disposed circumferentially around a portion of a circumference of the pipe, which provides an optical signal indicative of the length of the optical fiber. An optical instrument measures the change in length of the optical fiber to determine the unsteady pressure within the pipe. The pressure sensor may include a plurality of optical fiber sections disposed circumferentially around a portion of the circumference of the pipe that are optically connected together by optical fiber sections disposed axially along the pipe. The optical fiber sections may include fiber Bragg gratings having substantially the same or different reflection wavelengths to permit for example the sensors to be axially distributed along the fiber using wavelength division multiplexing and/or time division multiplexing.

US Patent:

7110893, Sep 19, 2006

Filed:

Oct 12, 2004

Appl. No.:

10/964044

Inventors:

Douglas H. Loose - Southington CT, US
Allen R. Davis - Falls Church VA, US

Assignee:

CiDRA Corporation - Wallingford CT

International Classification:

G06F 19/00

US Classification:

702 48, 702 45, 702 49, 7386106

Abstract:

Various methods are described which increase the efficiency and accuracy of a signal processor in determining parameters of a fluid using signals output by a spatial array of sensors disposed along a pipe. In one aspect, parameters used for calculating the temporal Fourier transform of the pressure signals, specifically the amount or duration of the data that the windowing function is applied to and the temporal frequency range, are adjusted in response to the determined parameter. In another aspect, an initialization routine estimates flow velocity so the window length and temporal frequency range can be initially set prior to the full array processing. In another aspect, the quality of one or more of the parameters is determined and used to gate the output of the apparatus in the event of low confidence in the measurement and/or no flow conditions. In another aspect, a method for determining a convective ridge of the pressure signals in the k-ω plane is provided.

Address:

615 Poplar Dr, Falls Church, VA 22046

VIN:

JM1CR293570140745

Make:

MAZDA

Model:

MAZDA5

Year:

2007