固液界面特征对致密/页岩储层渗吸行为的影响——以延长组7段+8段致密储层和龙马溪组页岩为例

doi:10.7623/syxb202310008

石油学报 ›› 2023, Vol. 44 ›› Issue (10): 1683-1692.DOI: 10.7623/syxb202310008

固液界面特征对致密/页岩储层渗吸行为的影响——以延长组7段+8段致密储层和龙马溪组页岩为例

魏兵¹, 王怡文¹, 赵金洲¹, Kadet Valeriy², 蒲万芬¹

1. 西南石油大学油气藏地质及开发工程全国重点实验室四川成都 610500;
2. 古勃金国立石油与天然气大学俄罗斯莫斯科 119991

收稿日期:2023-01-30 修回日期:2023-08-09 出版日期:2023-10-25 发布日期:2023-11-03
通讯作者: 魏兵,男,1983年8月生,2013年获加拿大新布伦瑞克大学博士学位,现为西南石油大学教授、博士生导师,主要从事复杂油气藏提高采收率理论和技术研究。
作者简介:魏兵,男,1983年8月生,2013年获加拿大新布伦瑞克大学博士学位,现为西南石油大学教授、博士生导师,主要从事复杂油气藏提高采收率理论和技术研究。Email:bwei@swpu.edu.cn
基金资助:
国家自然科学基金项目（No.52274041）、四川省杰出青年科学基金项目（2023NSFSC1954）和高等学校学科创新引智计划项目（D18016）资助。

Influence laws of solid-liquid interface characteristics on the imbibition behaviors of tight/shale reservoirs: a case study of tight reservoirs in Member 7 and 8 of Yanchang Formation and shale reservoirs in Longmaxi Formation

Wei Bing¹, Wang Yiwen¹, Zhao Jinzhou¹, Kadet Valeriy², Pu Wanfen¹

1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Gubkin Russian State University of Oil and Gas, Moscow 119991, Russia

Received:2023-01-30 Revised:2023-08-09 Online:2023-10-25 Published:2023-11-03

摘要/Abstract

摘要： 油/水/岩石间的固液界面特征是影响致密/页岩储层渗吸行为的关键，尤其对于界面张力达到超低且具有增溶乳化作用的渗吸体系，亟待明确其界面作用机制与渗吸行为的关系。以延长组7段+8段致密储层和龙马溪组页岩储层为研究对象，构筑了模拟地层水、常规表面活性剂（AES）、可形成纳米乳液的表面活性剂体系（nE-S）、含油核的预制纳米乳液（nE）及原位微乳液（mE-FS）5种典型渗吸液。深入开展了界面相互作用、渗吸物理模拟、归一化采收率模型、标度方程及渗吸数学模型的系统研究。研究结果表明：①mE-FS具有超低界面张力和增溶能力，可以显著改善岩石表面润湿性，大幅度提高渗吸采收率；②渗吸采收率mE-FS>nE>nE-S>AES>模拟地层水；③mE-FS渗吸采收率与岩心渗透率线性相关，渗透率越低，渗吸效果越差；④综合考虑界面张力和润湿性变化建立了适用范围宽的无因次时间标度模型；⑤将增溶系数引入渗吸理论数学模型建立了不同界面性质渗吸液的渗吸距离与时间的线性关系。

关键词: 致密/页岩储层, 渗吸行为, 固液界面特征, 增溶乳化, 数学模型

Abstract: The solid-liquid interface characteristics of oil, water and rock are critical to the imbibition behaviors of tight and shale reservoirs. Especially for the imbibitionsystem with ultralow interfacial tension and solubilization and emulsification effects. It is urgent to clarify the relationship between the interface action mechanism and imbibition behaviors. This paper is a case study of tight reservoirs in Member 7 and 8 of Yanchang Formation and shale reservoirs in Longmaxi Formation; five typical imbibition fluids were developed, including simulated formation water, basic surfactant (AES), surfactant system that can form nanoemulsion(nE-S), prefabricated nanoemulsion containing oil shell (nE)and in-situ microemulsion (mE-FS), and a systematic and deep study was carried out on interface interaction, physical simulation of imbibition, normalized recovery model, scale equation and imbibition mathematical model. The results indicate as follows.(1)mE-FS is characterized with solubilization ability and ultralow interfacial tension, and thus can significantly improve the rock surface wettability and imbibition recovery; (2)The recovery ratio of imbibition fluids is ranked as follows:mE-FS>nE>nE-S>AES>simulated formation water; (3)mE-FS imbibition recovery is linearly correlated with core permeability, i.e., the lower the permeability, the poor the imbibition effect; (4)A dimensionless time scale model with a wide range of application has been established by taking into full account interfacial tension and wettability changes; (5)Solubilization coefficient is introduced into the imbibition theory mathmatical model to establish a linear relationship between imbibition distance and time of imbibition fluids with different interface properties.

Key words: tight/shale reservoirs, imbibition behaviors, solid-liquid interface characteristics, solubilization and emulsification, mathematical model

中图分类号:

TE135

魏兵, 王怡文, 赵金洲, Kadet Valeriy, 蒲万芬. 固液界面特征对致密/页岩储层渗吸行为的影响——以延长组7段+8段致密储层和龙马溪组页岩为例[J]. 石油学报, 2023, 44(10): 1683-1692.

Wei Bing, Wang Yiwen, Zhao Jinzhou, Kadet Valeriy, Pu Wanfen. Influence laws of solid-liquid interface characteristics on the imbibition behaviors of tight/shale reservoirs: a case study of tight reservoirs in Member 7 and 8 of Yanchang Formation and shale reservoirs in Longmaxi Formation[J]. Acta Petrolei Sinica, 2023, 44(10): 1683-1692.

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固液界面特征对致密/页岩储层渗吸行为的影响——以延长组7段+8段致密储层和龙马溪组页岩为例

Influence laws of solid-liquid interface characteristics on the imbibition behaviors of tight/shale reservoirs: a case study of tight reservoirs in Member 7 and 8 of Yanchang Formation and shale reservoirs in Longmaxi Formation

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