Allen J Davis

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:

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.