非均质油藏高渗窜流通道封堵调剖机理研究  

Research on the mechanism of sealing and profile control of high permeability crossflow channels in heterogeneous reservoirs

作　　者：敖文君 郑金定 阚亮 黎慧 方月月 孔丽萍 AO Wen-jun;ZHANG Jin-ding;KAN Liang;LI Hui;FANGYue-yue;KONG Li-ping(CNOOC Enter Tech-Drilling&Production Co.,Tianjin 300452,China;CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《精细与专用化学品》2024年第9期22-26,共5页Fine and Specialty Chemicals

基　　金：中海油能源发展股份有限公司增储上产关键技术/产品研究重大专项(稳油控水、化学驱、低渗压裂方向)(HFKJ-ZX-GJ-2023-02)。

摘　　要：为了解决非均质性的砂岩油藏在长期的注水开发后,引起的高水相窜流优势通道等问题,以渤海某一油藏为研究对象,开展了储层内高渗窜流通道的成因分析,并通过实验研究了高渗窜流通道的封堵调剖体系及封堵机理,形成了“前置段塞+主段塞+封口段塞”的堵剂组合工艺。结果表明,在注凝胶体系前,注入非化学凝胶体系作为前置段塞,可以有效提高后续凝胶体系的成胶性能;主段塞为中强度凝胶体系与预交联凝胶颗粒组成的复合体系,中强度凝胶体系的成胶强度在3万~6万mPa·s,预交联凝胶颗粒浓度为800~1500mg/L;封口段塞为高强度凝胶体系,成胶强度在10万~20万mPa·s。物理模拟实验结果表明,所研究的封堵体系可以有效实现深部运移与封堵,达到液流剖面反转的效果,其驱油效率上较水驱提高采收增幅达21.2%。In order to solve the problems of high water phase flow advantage channels caused by long-term water injection development in heterogeneous sandstone reservoirs, a study was conducted on a certain oil reservoir in Bohai Sea to analyze the causes of high permeability flow channels in the reservoir.The sealing and profile control system and sealing mechanism of high permeability flow channels were studied through experiments, forming a combination technology of “pre plug+main plug+sealing plug” plugging agent.The results showed that the gelling performance of subsequent gel systems could be effectively improved by injecting a non chemical gel system as a pre slug before the gel system was injected.The main slug was a composite system composed of medium strength gel system and pre crosslinked gel particles.The gel forming strength of medium strength gel system was about 30000~60000mPa·s, and the concentration of pre crosslinked gel particles was 800~1500mg/L.The sealing slug was a high strength gel system, and the gelling strength was about 100000~200000mPa·s.The results of physical simulation experiments indicated that the studied sealing system can effectively achieve deep migration and sealing, achieving the effect of fluid flow profile reversal.Its oil recovery efficiency was improved by 21.2% compared to water flooding.

关 键 词：注水 窜流通道 封堵体系 成胶性能 采收率 

分 类 号：TE53[石油与天然气工程—油气田开发工程]