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1. WO2015122985 - OPTICAL FIBER DISTRIBUTED SENSORS WITH IMPROVED DYNAMIC RANGE

Publication Number WO/2015/122985
Publication Date 20.08.2015
International Application No. PCT/US2015/011321
International Filing Date 14.01.2015
IPC
E21B 47/002 2012.01
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
002by visual inspection
G01N 21/01 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
01Arrangements or apparatus for facilitating the optical investigation
G01V 8/02 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
8Prospecting or detecting by optical means
02Prospecting
CPC
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
E21B 47/135
E21B 47/14
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
14using acoustic waves
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
G01V 1/40
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
1Seismology; Seismic or acoustic prospecting or detecting
40specially adapted for well-logging
G01V 8/14
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
8Prospecting or detecting by optical means
10Detecting, e.g. by using light barriers
12using one transmitter and one receiver
14using reflectors
Applicants
  • BAKER HUGHES INCORPORATED [US]/[US]
Inventors
  • JOHNSTON, William
Priority Data
61/940,13814.02.2014US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL FIBER DISTRIBUTED SENSORS WITH IMPROVED DYNAMIC RANGE
(FR) CAPTEURS DISTRIBUÉS DE FIBRE OPTIQUE PRÉSENTANT UNE PLAGE DYNAMIQUE AMÉLIORÉE
Abstract
(EN)
An apparatus for sensing acoustic waves below a surface of the earth includes an optical fiber disposed below the surface of the earth and having a series of sensing units along the optical fiber with each sensing unit having three or more reflectors and an optical interrogator in optical communication with the optical fiber. The reflectors in each sensing unit are positioned to provide a linearized response that approximates a sawtooth wave better than a sinusoidal wave to sense the acoustic waves in a desired dynamic range. The optical interrogator is configured to transmit an input light signal into the optical fiber and receive a reflected light signal from the optical fiber due to the input light signal in order to measure a strain on each sensing unit due to interaction with the acoustic waves and to determine a location of the sensing unit corresponding to the sensed strain.
(FR)
L'invention concerne un appareil pour détecter des ondes acoustiques au-dessous d'une surface de la terre qui comprend une fibre optique disposée sous la surface de la terre et comportant une série d'unités de détection le long de la fibre optique, chaque unité de détection comportant trois réflecteurs ou plus et un interrogateur optique en communication optique avec la fibre optique. Les réflecteurs dans chaque unité de détection sont positionnés pour fournir une réponse linéarisée qui approxime une onde en dents de scie mieux qu'une onde sinusoïdale pour détecter les ondes acoustiques dans une plage dynamique souhaitée. L'interrogateur optique est configuré pour transmettre un signal lumineux d'entrée dans la fibre optique et recevoir un signal lumineux réfléchi à partir de la fibre optique dû au signal lumineux d'entrée afin de mesurer une déformation sur chaque unité de détection due à l'interaction avec les ondes acoustiques et pour déterminer un emplacement de l'unité de détection correspondant à la déformation détectée.
Also published as
GB1614740.7
Latest bibliographic data on file with the International Bureau