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1. US20170130574 - Distributed sensing systems and methods with efficient energy spectrum analysis

Office United States of America
Application Number 15323079
Application Date 18.07.2014
Publication Number 20170130574
Publication Date 11.05.2017
Grant Number 10267141
Grant Date 23.04.2019
Publication Kind B2
IPC
E21B 47/00
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47Survey of boreholes or wells
G01V 1/22
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
1Seismology; Seismic or acoustic prospecting or detecting
22Transmitting seismic signals to recording or processing apparatus
E21B 47/12
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47Survey of boreholes or wells
12Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
G01H 9/00
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
9Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
CPC
E21B 47/0002
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
47Survey of boreholes or wells
0002Survey of boreholes or wells by visual inspection
E21B 47/123
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
47Survey of boreholes or wells
12Means for transmitting measuring-signals ; or control signals; from the well to the surface ; or from the surface to the well; , e.g. for logging while drilling
122by electromagnetic energy, e.g. radio frequency
123using light waves
G01H 9/004
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
9Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
004using fibre optic sensors
G01V 1/226
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
1Seismology; Seismic or acoustic prospecting or detecting
22Transmitting seismic signals to recording or processing apparatus
226Optoseismic systems
Applicants HALLIBURTON ENERGY SERVICES, INC.
Inventors Leonardo de Oliveira Nunes
Christopher Lee Stokely
David Andrew Barfoot
Agents Gilliam IP PLLC
Title
(EN) Distributed sensing systems and methods with efficient energy spectrum analysis
Abstract
(EN)

A system includes an optical fiber and an interrogator to provide source light to the optical fiber. The system also includes a receiver coupled to the optical fiber. The receiver includes at least one fiber optic coupler that receives backscattered light and that produces one or more optical interferometry signals from the backscattered light. The receiver also includes photo-detectors that produce an electrical signal for each of the one or more optical interferometry signals. The system also includes at least one digitizer that digitizes each electrical signal. The system also includes at least one processing unit that processes each digitized electrical signal to obtain a distributed sensing signal and related energy spectrum information. The energy spectrum information corresponds to energy calculated for each of a limited number of frequency subbands by segmenting the distributed sensing signal into blocks having a predetermined block length and by applying a filter having a filter length that is smaller than the predetermined block length.

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