酸化殺菌技术研究及在注水井中应用,201244.docVIP

酸化杀菌技术研究及在注水井中应用 张磊1，赵凤兰1，斯文2 ，姜康1，丁观世1 1.中国石油大学（北京），北京 昌平 102249； 2.中原油田采油四厂，河南 濮阳 457001 【摘 要】：本文研究从油藏物性着手，结合化验手段分析出地层渗透率下降是由于水质变化和细菌污染所引起，需要对油层进行酸化、杀菌以解堵增注。通过开展室内评价实验以确定酸化杀菌液体系，实验包括四个方面的内容：酸化液的腐蚀性、杀菌性、防二次伤害及穿透性。实验表明该酸化液体系能满足文87区块的酸化增注要求。以室内实验为依据的现场应用表明该酸化杀菌技术具有较好的增注效果，文中分析了W87-8井在施工前后注入压力和注入量的变化情况。 关键词：酸化；杀菌；缓速；二次伤害；增注 The Research and Application of Acidification and Sterilization Technology in Water Injection Well Zhang Lei, Zhao Fenglan, SiWen, JiangKan, Ding Guanshi 1 China University of Petroleum(Bei Jing), BeiJing ChangPing 102249; 2 the Fourth oil Mining Factory of ZhongYuan Oilfield, HeNan PuYang 457001 Abstract: On the base of reservoir properties, and combined with chemical analysis, this paper revealed that formation permeability reduction was due to changes in injection water quality and the pollution of formation caused by bacteria. It was necessary to take acidification、sterilization on the reservoir to increase the injection water volume. In the setting of acidizing fluid system, the evaluation of acidizing fluid performance was carried out by laboratory experiments. The experiment included four aspects of acidizing fluid: corrosivity、bactericidal properties、preventing the secondary damage and penetrability. The experimental results show that the acidizing fluid system can meet the requirement of Wen 87 block acid stimulation. The field application, based on laboratory experiments, indicated that the acid has a very good stimulation effect, and analyzed W87-8 well injection pressure and injection volume change in before and after the construction. Key words: acidification；sterilization；retardation；the secondary damage；injection increasing 1.油藏概况 中原文87区块属高温高盐复杂断块油气藏，油藏深度平均3000m，储层孔隙度10%~27%，平均渗透率(5~600)×10-3μm2，储层非均质强，渗透率变异系数0.6~0.98，渗透率级差3~50；油藏温度92℃，地层水为CaCl2型。储层主要为长石粗粉砂岩，次为细粉砂岩及少量细砂岩；孔隙以粒间孔为主，粒间溶孔次之；胶结物以泥质为主、灰质及白云质次之；粘土矿物含量8.3%，其中大部分为高岭石和伊利石，也含部分的绿泥石；灰质中以石灰石和白云石为主，含少量的菱铁矿。该油田的储层物性给油田注水及稳产带来极大难度，且在长期的注水过程中，注水井的近井地带受到堵塞、结垢、