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1. WO2013109847 - INTERFERENCE REDUCTION METHOD FOR DOWNHOLE TELEMETRY SYSTEMS

Publication Number WO/2013/109847
Publication Date 25.07.2013
International Application No. PCT/US2013/022089
International Filing Date 18.01.2013
IPC
E21B 47/18 2012.1
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
14using acoustic waves
18through the well fluid
E21B 21/08 2006.1
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
21Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
08Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
E21B 47/12 2012.1
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
CPC
E21B 47/18
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
18through the well fluid ; , e.g. mud pressure pulse telemetry
G01V 11/002
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
11Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
002Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant
H04B 1/10
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
06Receivers
10Means associated with receiver for limiting or suppressing noise or interference
Applicants
  • BAKER HUGHES INCORPORATED [US]/[US]
Inventors
  • MOGHADDAMNIA, Sanam
  • ZHENG, Feng
  • BRAHIM, Imed Ben
  • EMMERICH, Wojciech
  • HANSEN, Christian
  • BRUNS, Jens-Uwe
Priority Data
13/352,71418.01.2012US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) INTERFERENCE REDUCTION METHOD FOR DOWNHOLE TELEMETRY SYSTEMS
(FR) PROCÉDÉ DE RÉDUCTION D'INTERFÉRENCE POUR SYSTÈMES DE TÉLÉMÉTRIE DE FOND DE TROU
Abstract
(EN) A method for reducing interference in a received downhole telemetry signal includes: segmenting a received signal; windowing each signal segment; transforming each windowed signal segment into a complex variable domain to generate a plurality of complex variable domain segments with an in-phase component vector I and a quadrature component vector Q; calculating a real amplitude vector A from the I and the Q vectors; filtering interferers in the amplitude vector A for each complex variable domain segment to generate a filtered amplitude vector Ã; recalculating an amplitude of the amplitude vector A using the filtered amplitude vector à to generate an output amplitude vector Â; scaling the I and the Q vectors by a factor Â/A to generate an output in-phase component vector I' and an output quadrature component vector Q'; and transforming I' and Q' into the time domain to provide an interference-reduced output signal in the time domain.
(FR) La présente invention concerne un procédé pour la réduction d'interférence dans un signal de télémétrie de fond de trou reçu comprenant les étapes suivantes : la segmentation d'un signal reçu ; le fenêtrage de chaque segment de signal ; la transformation de chaque segment de signal fenêtré en un domaine de variables complexes pour générer une pluralité de segments de domaine de variables complexes avec un vecteur de composante en phase I et un vecteur de composante en quadrature Q ; le calcul d'un vecteur d'amplitude réel A à partir des vecteurs I et Q ; le filtrage d'éléments brouilleurs dans le vecteur d'amplitude A pour chaque segment de domaine de variables complexes pour générer un vecteur d'amplitude filtré à ; un nouveau calcul d'une amplitude du vecteur d'amplitude A au moyen du vecteur d'amplitude filtré à pour générer un vecteur d'amplitude de sortie  ; la mise à l'échelle des vecteurs I et Q par un facteur Â/A pour générer un vecteur I' de composante en phase de sortie et un vecteur Q' de composante en quadrature de sortie ; et la transformation de I' et Q' en un domaine temporel pour fournir un signal de sortie à interférence réduite dans le domaine temporel Ã/A.
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