入井工作液顺序接触煤岩储层损害实验评价.pdfVIP

第43 卷 第6 期 煤田地质与勘探 Vol. 43 No.6 2015 年 12 月 COAL GEOLOGY EXPLORATION Dec. 2015 文章编号: 1001-1986(2015)06-0128-05 入井工作液顺序接触煤岩储层损害实验评价 康毅力，战丽颖，李相臣，周来诚 (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) : 致密煤岩具有高毛管压力和比表面积大等特点，在钻井、完井和增产改造过程中，流体侵 入将造成储层损害，显著降低工程技术效果。以往文献仅报道了单项工作液对煤岩储层的损害， 忽视了工作液顺序接触煤岩储层损害的叠加效应。以川南煤田古叙矿区上二叠统龙潭组煤样为研 究对象，开展了流体之间配伍性实验、钻井完井液与压裂液顺序接触煤样对渗透率损害实验。单 项工作液储层损害评价实验结果表明，压裂液对储层的损害最严重，钻井完井液次之；工作液配 伍性和顺序接触损害评价实验结果表明，与钻井完井液接触后，瓜胶压裂液损害最严重，离子平 衡压裂液次之，活性水压裂液较轻，清洁压裂液最轻。顺序损害实验反映了工程实际过程，为入 井流体评价和优选提供理论依据，有利于促进煤层保护和煤层气高效开发。 ：煤层气；钻井完井液；压裂液；配伍性；储层损害 ：P618.13 ：A DOI: 10.3969/j.issn.1001-1986.2015.06.027 Experimental evaluation of coalbed reservoir damage induced by sequential contacts with working fluids KANG Yili, ZHAN Liying, LI Xiangchen, ZHOU Laicheng (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China) Abstract: With high capillary pressure and large specific surface area, tight coalbed may be damaged by fluid in- vasion during drilling, completion and stimulation, which may reduce engineering technical efficiency significantly. Previously, only single working fluid damage to coal reservoir has been reported, seldom taking superimposed ef- fect of damage induced by sequential contact of working fluids with the coal reservoir into account. Collecting coal samples from coal seams of upper Permian Longtan Formation in Guxu mine, southern Sichuan coal field, we conducted compatibility experiment between fluids and the permeability damage experiments of se