摘要
针对华北油藏,选取淀粉凝胶在室内开展配方优选及性能评价,随后采用三维水窜模型开展凝胶/CO_(2)复合吞吐室内物理模拟实验,并提出了通过凝胶/CO_(2)复合吞吐提高采收率的方法。结果表明,优选的凝胶体系具有良好的注入性能,小剂量凝胶体系即可在水窜通道中形成I级刚性凝胶,其阻力系数仅为4.36,残余阻力系数高达604.70。三维物理模拟实验结果表明,凝胶/CO_(2)复合吞吐可提高采收率11.36%,降低含水量至4%~18%。在淀粉凝胶封堵强窜通道后,CO_(2)可有效置换近井地带剩余油,同时边水可动用基质内部剩余油,在CO_(2)和边水的双重作用下,大幅度提高强水窜油藏采收率。
For Huabei Oilfield,starch gel is selected to carry out formulate optimization and performance evaluation in laboratory,and then 3D water channeling model was used to carry out indoor physical model experiment of gel/CO_(2)composite huff and puff,and the method of improving oil recovery through gel/CO_(2)composite huff and puff is proposed.The results show that the optimized starch gel has an excellent injectivity,and a rigid gel classified as I can formed within the strong channels using a small dose of gel.The resistance factor is only 4.36,and the residual resistance factor can reach 604.70.3D experimental results show that the oil recovery of gel combined CO_(2)huff-n-puff can be enhanced by 11.36%,and the water cut can be dropped to 4%—18%.After the plugging of strong channels by starch gel,the oil remained at near-wellbore area can be extracted by CO_(2),and the oil remained at deep formation can be displaced by edge water.With the combined of CO_(2)extraction and edge-water driving,the oil recovery can be significantly enhanced in the strong channeling oil reservoir.
作者
郝宏达
侯吉瑞
郭文敏
刘怀珠
HAO Hongda;HOU Jirui;GUO Wenmin;LIU Huaizhu(School of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou 213164,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China;Drilling&Production Technology Research Institute,PetroChina Jidong Oilfield Company,Tangshan 063000,China)
出处
《常州大学学报（自然科学版）》
CAS
2023年第5期67-75,共9页
Journal of Changzhou University：Natural Science Edition
基金
国家自然科学基金资助项目(5274046)。
作者简介
郝宏达(1990-),男,黑龙江尚志人,博士,讲师。E-mail:haohongda90@126.com。
