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1. (WO2017156338) LOW FREQUENCY DISTRIBUTED ACOUSTIC SENSING

Pub. No.:    WO/2017/156338    International Application No.:    PCT/US2017/021679
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: G01V 1/28
C09K 8/00
E21B 47/00
Applicants: CONOCOPHILLIPS COMPANY
Inventors: JIN, Ge
MOSHER, Charles C.
FILICE, Frank P.
KRUEGER, Kyle R.
ROY, Baishali
TURA, Ali
JURICK, Dana M.
Title: LOW FREQUENCY DISTRIBUTED ACOUSTIC SENSING
Abstract:
The invention relates to DAS observation has been proven to be useful for monitoring hydraulic fracturing operations. While published literature has shown focus on the high-frequency components (> 1Hz) of the data, this invention discloses that much of the usable information may reside in the very low frequency band (0-50 milliHz). Due to the large volume of a DAS dataset, an efficient workflow has been developed to process the data by utilizing the parallel computing and the data storage. The processing approach enhances the signal while decreases the data size by 10000 times, thereby enabling easier consumption by other multi-disciplinary groups for further analysis and interpretation. The polarity changes as seen from the high signal to noise ratio (SNR) low frequency DAS images are currently being utilized for interpretation of completions efficiency monitoring in hydraulically stimulated wells.