压裂液对新沟嘴组储层硬石膏胶结物的溶蚀机理研究  

Study on the mechanism of fracturing fluid dissolution on anhydrite cement of Xingouzui formation reservoir

作　　者：牟莎莎 柳建新[2,3] 徐峰[1] 付利琴 胡云鹏 陈金建 董沅武 MU Sha-sha;LIU Jian-xin;XU Feng;FU Li-qin;HU Yun-peng;CHEN Jin-jian;DONG Yuan-wu(Research Institute of Petroleum Engineering Technology,Jianghan Oilfield Branch,Sinopec,Qianjiang 433121,China;College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Leak Resistance&Sealing Technology Research Department National Engineering Laboratory of Petroleum Dilling Technology,Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China;Jianghan Oil Product Plant,Jianghan Oilfield Branch,Sinopec,Qianjiang 433121,China)

机构地区：[1]中国石化江汉油田分公司石油工程技术研究院,湖北潜江433121 [2]长江大学石油工程学院,湖北武汉430100 [3]油气钻井技术国家工程实验室防漏堵漏研究室,油气钻采工程湖北省重点实验室,湖北武汉430100 [4]中国石化江汉油田分公司江汉采油厂,湖北潜江433121

出　　处：《应用化工》2021年第S02期87-90,共4页Applied Chemical Industry

基　　金：湖北省自然科学基金(2017CFB486)。

摘　　要：通过X射线衍射、扫描电镜、偏光薄片分析等研究方法对江陵凹陷新沟嘴组硬石膏胶结的低渗透砂岩油藏在压裂过程中的水敏性伤害机理进行了研究。结果表明,流体对硬石膏的溶蚀作用也是导致储层水敏性伤害的重要原因。温度、压力、矿化度以及压裂液的组分会加剧硬石膏的水化溶解和再沉淀,同时胶结弱化会导致储层骨架砂屑脱落,这些微粒会堵塞细小孔喉并显著降低压裂后储层的渗透率。因此,在对富含硬石膏的油气藏进行压裂施工时应重视硬石膏导致的水敏性伤害问题,并通过调整压裂液配方组成抑制硬石膏的水化过程。Many research methods are used to study the water sensitivity damage mechanism of anhydrite cemented low-permeability sandstone reservoirs in the Xingouzui Formation of Jiangling Depression during fracturing,include X-ray diffraction,in-situ scanning electron microscopy,polarized thin section analysis and so on.The results show that the dissolution of anhydrite by the fluid is an important cause of damage to the water sensitivity of the reservoir.Higher temperature,pressure,salinity and fracturing fluid composition will aggravate the hydration,dissolution and re-precipitation of anhydrite,and weakening of the cementation will lead to the shedding of reservoir framework sands.These particles can block the fine pore throats and significantly reduce the permeability of the reservoir after fracturing.Therefore,when fracturing the oil and gas reservoirs rich in anhydrite,attention should be paid to the water sensitivity damage caused by anhydrite,and the hydration process of anhydrite should be inhibited by adjusting the composition of the fracturing fluid.

关 键 词：硬石膏 压裂 储层伤害 水敏性 

分 类 号：TE258[石油与天然气工程—油气井工程]