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Proceedings Paper

Walkaway-VSP survey using distributed optical fiber in China oilfield
Author(s): Junjun Wu; Gang Yu; Qinghong Zhang; Yanpeng Li; Zhidong Cai; Yuanzhong Chen; Congwei Liu; Haiying Zhao; Fei Li
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Paper Abstract

Distributed acoustic sensing (DAS) is a new type of replacement technology for geophysical geophone. DAS system is similar to high-density surface seismic geophone array. In the stage of acquisition, DAS can obtain the full well data with one shot. And it can provide enhanced vertical seismic profile (VSP) imaging and monitor fluids and pressures changes in the hydrocarbon production reservoir. Walkaway VSP data acquired over a former producing well in north eastern China provided a rich set of very high quality data. A standard VSP data pre-processing workflow was applied, followed by pre-stack Kirchhoff time migration. In the DAS pre-processing step we were faced with additional and special challenges: strong coherent noise due to cable slapping and ringing along the borehole casing. The single well DAS Walkaway VSP images provide a good result with higher vertical and lateral resolution than the surface seismic in the objective area. This paper reports on lessons learned in the handling of the wireline cable and subsequent special DAS data processing steps developed to remediate some of the practical wireline deployment issues. Optical wireline cable as a conveyance of fiber optic cables for VSP in vertical wells will open the use of the DAS system to much wider applications.

Paper Details

Date Published: 24 October 2017
PDF: 5 pages
Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104642B (24 October 2017);
Show Author Affiliations
Junjun Wu, BGP Inc., CNPC (China)
Gang Yu, BGP Inc., CNPC (China)
Qinghong Zhang, BGP Inc., CNPC (China)
Yanpeng Li, BGP Inc., CNPC (China)
Zhidong Cai, BGP Inc., CNPC (China)
Yuanzhong Chen, BGP Inc., CNPC (China)
Congwei Liu, BGP Inc., CNPC (China)
Haiying Zhao, BGP Inc., CNPC (China)
Fei Li, BGP Inc., CNPC (China)

Published in SPIE Proceedings Vol. 10464:
AOPC 2017: Fiber Optic Sensing and Optical Communications
Zi-Sen Zhao; Leping Wei; Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Kenneth T. V. Grattan, Editor(s)

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