致密砂岩气藏压裂液滞留伤害保护研究  

Study on fracturing fluid retention damage protection in tight sandstone gas reservoirs

作　　者：胡艾国[1,2] 张宇 左承未[2] 李小江 贾振福 Hu Aiguo;Zhang Yu;Zuo Chengwei;Li Xiaojiang;Jia Zhenfu*(Petroleum Engineering Technology Research Institute,North China Oil and Gas Company,Sinopec,Zhengzhou 450006;Chongqing Institute of Science and Technology,Chongqing 401331)

机构地区：[1]中国石化华北油气分公司石油工程技术研究院,河南郑州450006 [2]重庆科技学院,重庆401331

出　　处：《石化技术》2023年第6期170-172,共3页Petrochemical Industry Technology

摘　　要：针对致密砂岩气藏压裂液滞留中液相侵入损害问题,本研究以东胜气田盒1层致密砂岩为研究对象,分析了储层基本特性,并探究了优化添加剂前后胍胶压裂液对储层渗透率的伤害。实验结果表明:此类储层主要以石英含量为主,平均含量为92%,粘土含量平均为7.36%,此外具有较高含量速敏性的伊利石、易发生膨胀运移的伊/蒙间层。针对压裂液侵入液相伤害,优化润湿反转剂、防膨剂添加剂前后压裂液伤害实验发现,压裂液侵入且大量水化后疏松的黏土颗粒及岩屑,黏土的膨胀造成粒内孔缝堵塞,孔道表现出丝状伊利石与片状绿泥石胶结对孔道的堵塞;优化后压裂液伤害岩芯表面可以看出水化后疏松、脱落的黏土颗粒较少,孔道中伴随着绿泥石的运移对孔缝的堵塞。The experimental results show that this type of reservoir is mainly composed of quartz with an average content of 92%and clay with an average content of 7.36%.In addition,there are high content and velocity sensitive illite and the interlayer of Yi/Mengmeng which is easy to swell and migrate.Aiming at the damage caused by fracturing fluid intrusions into liquid phase,the experiment of fracturing fluid damage the expansion and migration of clay caused the plugging of pores within the particles,and the pores showed the blockage of filamentous illite and flake chlorite cement.The optimized fracturing fluid damaged the core surface.It can be seen that the clay particles were loose and shed less after hydration,and the pores were blocked by the migration of chlorite.

关 键 词：致密砂岩 压裂液 储层伤害 储层保护 

分 类 号：TE377[石油与天然气工程—油气田开发工程]