压裂液对煤岩储层解吸–扩散性能的影响  

Effect of fracturing fluid on the desorption-diffusion property of coal

作　　者：高波[1] 康毅力[2] 史斌[1] 游利军[2] 黄小凤[1] 皇凡生 GAO Bo;KANG Yili;SHI Bin;YOU Lijun;HUANG Xiaofeng;HUANG Fansheng(CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, SWPU, Chengdu 610500, China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《煤田地质与勘探》2016年第6期79-84,共6页Coal Geology & Exploration

基　　金：中海油能源发展重大科技专项(HFKJ-CJFZ-1311)~~

摘　　要：为预防压裂液自吸侵入煤岩基质孔隙,影响煤岩储层的解吸–扩散性能,以沁水盆地石炭统太原组15号煤为研究对象,开展了低伤害活性水压裂液对煤岩储层解吸–扩散性能的损害评价实验,并基于红外光谱、低温氮气吸附和扫描电镜分析了压裂液作用前后的煤岩表面性质和孔隙结构变化。实验结果表明:压裂液处理后,煤样的甲烷解吸率下降了10.23%,扩散系数损害率为16.67%;煤岩表面亲水性增强,液相滞留效应加剧,煤岩基质孔隙比表面增大、孔隙连通性变差、平均孔径减小,这些变化从根本上揭示了压裂液损害煤岩储层解吸-扩散性能的微观机理。最后,提出了基于纳米颗粒封堵技术和表面活性剂技术的煤岩储层解吸–扩散性能损害预防措施。Aiming at preventing the fracturing fluid significantly affecting the desorption-diffusion property of CBM reservoirs through spontaneously imbibing into the coal matrix, methane desorption-diffusion experiments before and after fracturing fluid treatment was conducted on the coal samples from No.15 coal seam of Qinshui basin.Besides, the variations of surface property and pore structure were also analyzed by FTIR, low temperature N2 adsorption and SEM methods. The results showed that after fracturing fluid treatment the methane desorption ratio dropped by 10.23% and the damage extent of diffusion coefficient was 16.67%; under the influence of fracturing fluid, the hydrophilicity was enhanced, the effect of liquid retention was aggravated, the pore connectivity became worse, the specific surface area increased and the average pore size decreased. These changes revealed radically the microscopic mechanisms of the effect of fracturing fluid on the desorption-diffusion property of CBM reservoir.Finally, the control methods based on nano-particle plugging and surfactant technology were also proposed to prevent the damage to desorption-diffusion property of CBM reservoirs.

关 键 词：煤层气 压裂液 储层损害 解吸 扩散 纳米颗粒 表面活性剂 

分 类 号：TE357[石油与天然气工程—油气田开发工程]