高盐低渗透油藏CO_(2)泡沫微观尺度耐盐性及调驱效果  

Microscale Salt Tolerance and Profile Control of CO_(2)Foam in High⁃Salinity,Low⁃Permeability Reservoirs

作　　者：魏鸿坤 王健[1] 王丹翎[1] 路宇豪 周娅芹 赵鹏 WEI Hongkun;WANG Jian;WANG Danling;LU Yuhao;ZHOU Yaqin;ZHAO Peng(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;No.3 Oil Production Plant,Changqing Oilfield Company,PetroChina,Yinchuan,Ningxia 750000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中国石油长庆油田分公司第三采油厂,银川750000

出　　处：《新疆石油地质》2024年第6期703-710,共8页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(52174035)。

摘　　要：针对高盐低渗透油藏CO_(2)驱存在的气窜问题,以长庆油田H3区块为研究对象,构建SiO_(2)纳米颗粒强化CO_(2)泡沫体系,从泡沫流变性、气液界面张力、气泡液膜厚度与渗透性、泡沫微观结构4个方面评价泡沫体系耐盐性;通过开展SiO_(2)纳米颗粒强化CO_(2)泡沫体系并联岩心调驱实验,研究该体系调驱效果。根据实验结果,在油藏条件下,构建出配方为质量分数0.20%(OW-1)+0.30%(OW-4)+0.05%(SiO_(2))纳米颗粒强化CO_(2)泡沫体系,该泡沫体系的综合指数为36834 mL·min;该泡沫体系的微观尺度耐盐性评价结果表明,矿化度46357 mg/L与矿化度500 mg/L的配液相比,泡沫流变性更好,气液界面张力在10 MPa时仅增加1 mN/m,液膜渗透性增加了0.14 cm/s,但仍具有良好的泡沫骨架结构,该泡沫体系具有良好的耐盐性。此外,在并联岩心渗透率级差为15.55的条件下,该SiO_(2)纳米颗粒强化CO_(2)泡沫体系对岩心剖面改善率达到了97.28%,采收率显著提升,展现出良好的调驱能力。Regarding gas channeling during CO_(2)flooding in high⁃salinity,low⁃permeability reservoirs,taking the H3 block of Changqing oilfield as an example,an enhanced CO_(2)foam system with SiO_(2)nano⁃particales was constructed to evaluate its salt tolerance with respect to foam rheology,gas⁃liquid interfacial tension,liquid film thickness and permeability,and foam microstructure.A parallel core displacement experiment was conducted for the foam system to assess its profile control performance.Based on the experimental results,a foam system of 0.20%(OW⁃1)+0.30%(OW⁃4)+0.05%(SiO_(2))was developed under reservoir conditions,achieving a comprehensive index of 36,834 mL·min.The microscale salt tolerance evaluation indicates that,as compared with the foaming agents prepared at salinity of 46,357 mg/L and 500 mg/L,the developed foam system exhibits better rheological properties.The gas⁃liquid interfacial tension increased by only 1 mN/m at 10 MPa,and the liquid film permeability was improved by 0.14 cm/s.However,the foam system still maintains a robust skeletal structure.Thus,it is demonstrated with excellent salt tolerance at the microscale.Furthermore,for parallel cores with the permeability ratio of 15.55,the developed SiO_(2)nanoparticle⁃enhanced CO_(2)foam system improves the core profile by 97.28%,suggesting a remarkable enhancement in oil recovery,and demonstrating a good profile control performance.

关 键 词：高盐低渗透油藏 长庆油田 气窜 CO_(2)泡沫 微观尺度 耐盐性 调驱 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]