Analysis of coalbed methane reservoir characteristics and reconstructiontechnology in Furong mining area of south Sichuan
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    Abstract:

    Objectives: The resource condition of coalbed methane in Furong Mining Area of south Sichuan is superior. However, the degree of geological research is extremely low, which restricted the development of coalbed methane in the area. This study is to analyze the coal reservoirs characteristics of the Chuangao parameter 1 well, to discuss the Hydraulic fracturing technique matching the characteristics of coal reservoir, and analyze the effects of drainage test, and to provide theoretical and engineering reference for the exploration and development of coal bed methane in the area. Methods: By the Chuangao parameter 1 well drilling and Core sample testing, Comprehensive analyzed the reservoir parameters which influence the enrichment and development of CBM, C6+7 and C8coal seams were optimized for multi- layer hydraulic fracturing reconstruction. Meanwhile, the reservoir transformation effect is verified and evaluated through the ground microseismic monitoring and drainage test. Results: The thin—medium thick coal seam group in the study area is well- developed and mainly composed of primary structure anthracite. The coal seams have the porosity of 2. 2%~4. 6% and permeability of (0. 013~0. 027)×10-3μm2, and belong to low porosity and low permeability reservoirs. The C6+7 and C8coal seams in the mining area have large and stable thickness, with moderate buried depth, high gas content and gas saturation, and high reservoir pressure gradient, all of which is conducive to the enrichment of coalbed methane (CBM) and its development on the basis of reservoir reconstruction. Conclusions: The C6+7and C8coal seams owned good storage and gas- bearing conditions, utilized hydrodynamic fracturing techniques maching to the characteristics of coalbed reservoir, so as improved the ability of active water fracturing fluid to build cracks and carry sand through many fracturing process optimization measures, increased the proportion of pre- liquid, slowly increased the pumping displacement, and the multi- stage plug- in fluid loss in the pre- liquid phase, the fine—medium quartz sand proppant combination. The coal reservoir produced vertical fractures, with good length and width, and large volume, which effectively improves the conductivity of the coal reservoir around the wellbore. In the subsequent drainage test phase, the highest daily gas production reached 8307 m3, and the stable production was more than 6000 m3/d for 90 consecutive days. The highest daily production and stable gas production in a single well in the southwest region were achieved, and a major breakthrough in regional CBM exploration was realized.

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SHAN Yansheng, BI Caiqin, ZHANG Jiaqiang, CHI Huanpeng, ZHU Hanyou, LUO Yong, YU Tingxu, LI Feng, XU Yinbo, TONG Lihua.2019. Analysis of coalbed methane reservoir characteristics and reconstructiontechnology in Furong mining area of south Sichuan[J]. Geological Review,65(6):1515-1521.

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History
  • Received:April 26,2019
  • Revised:July 28,2019
  • Adopted:
  • Online: November 15,2019
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