川南芙蓉矿区煤储层特征及合层压裂改造工艺研究
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注: 本文为自然资源部中国地质调查局油气基础地质调查专项(编号:121201021000150014)的成果。


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

    内容提要: 基于中国地质调查局组织施工的川高参1井资料,分析了川南芙蓉矿区上二叠统宣威组煤储层特征,优选C6+7和C8煤层采用大液量、中高排量、中砂比、变粒径支撑剂、多级阶梯式加砂工艺实施了合层水力压裂改造,并通过地面微地震监测及排采试验评价,验证了储层改造效果。研究表明:研究区薄—中厚煤层群发育,主要为原生结构无烟煤,煤层孔隙度2. 2%~4. 6%,渗透率(0. 013~0. 027) ×10-3 μm2,属低孔低渗型储层。井区内C6+7、C8煤层厚度大且稳定,埋深适中,含气量、含气饱和度高,储层压力梯度高异常,有利于煤层气富集并在储层改造基础上开发。C6+7与C8合层压裂过程中,通过增大前置液量比例,缓慢提高泵注排量,注前置液阶段多段塞降滤失,细中粒石英砂支撑剂组合等压裂工艺优化措施,提高活性水压裂液造缝及携砂能力。地面微地震监测显示,川高参1井压裂裂缝以NW—SE向垂直缝为主,裂缝长度、宽度及影响体积都较大,有效改善了井筒周围煤储层的导流能力;后续排采试验阶段,最高日产气量达8307 m3,连续90天稳产6000 m3/d以上,创西南地区直井单井最高日产量和稳定产气量新高,实现了区域煤层气勘查重大突破。

    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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单衍胜,毕彩芹,张家强,迟焕鹏,朱韩友,罗勇,喻廷旭,李锋,徐银波,仝立华.2019.川南芙蓉矿区煤储层特征及合层压裂改造工艺研究[J].地质论评,65(6):1515-1521,[DOI].
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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  • 收稿日期:2019-04-26
  • 最后修改日期:2019-07-28
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  • 在线发布日期: 2019-11-15
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