西南石油大学学报(自然科学版) ›› 2023, Vol. 45 ›› Issue (6): 80-94.DOI: 10.11885/j.issn.1674-5086.2022.05.04.02

• 石油与天然气工程 • 上一篇    下一篇

页岩气井液岩相互作用机理与焖井制度研究进展

杨兆中1, 杜慧龙1, 易良平1,2, 李小刚1, 苟良杰1   

  1. 1. 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500;
    2. 西南石油大学机电工程学院, 四川 成都 610500
  • 收稿日期:2022-05-04 发布日期:2024-01-06
  • 通讯作者: 易良平,E-mail:ylpfrac@163.com
  • 作者简介:杨兆中,1969年生,男,汉族,四川泸州人,教授,博士研究生导师,主要从事油气田开发工程油气开采领域的教学和研究工作。E-mail:yzzycl@vip.sina.com;杜慧龙,1998年生,男,汉族,宁夏固原人,硕士,主要从事油气田开发方面的研究工作。E-mail:1243693486@qq.com;易良平,1991年生,男,汉族,四川泸州人,副研究员,博士,主要从事油气藏增产改造方面的教学与科研工作。E-mail:ylpfrac@163.com;李小刚,1981年生,男,汉族,四川仁寿人,教授,博士研究生导师,主要从事油气增产等方面的研究与教学工作。E-mail:swpuadam@126.com;苟良杰,1998年生,男,汉族,四川巴中人,博士,主要从事油气增产领域等方面研究工作。E-mail:244233843@qq.com
  • 基金资助:
    四川省自然科学基金(2020JDJQ0059)

Mechanisms of Fluid-rock Interaction and Systems of Soaking in Shale Gas Reservoir: A Research Review

YANG Zhaozhong1, DU Huilong1, YI Liangping1,2, LI Xiaogang1, GOU Liangjie1   

  1. 1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. College of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2022-05-04 Published:2024-01-06

摘要: 页岩气生产实践表明,压裂作业结束后焖井能显著提高气井初期产量,但面对特定情况如何制定科学的焖井制度,缺乏对现有文献的全面回顾和总结。基于国内外学者在页岩气井焖井期间液岩相互作用对储层的改造和损害机理、模型和影响因素等方面的研究成果,总结了液岩相互作用机理和现有焖井制度,结果表明,储层条件下液岩相互作用是焖井增产的本质,液岩相互作用程度是制定焖井制度的关键。焖井期间液岩相互作用对储层兼具改造和损害作用,对储层的改造包括微裂缝的萌生扩展和气液渗吸置换;对储层的损害包括固相堵塞和压裂液侵入引起的水相圈闭,建立液岩相互作用与储层有效孔隙结构参数之间的未知桥梁是研究焖井制度的关键。针对目前制约液岩相互作用研究的跨尺度和高度非线性问题,提出了基于分子动力学的有效裂缝刻画模型和工业级人工智能页岩气井焖井优化模型。

关键词: 页岩气, 液岩相互作用, 焖井制度, 微裂缝扩展, 储层损害

Abstract: The production practice of shale gas reservoirs shows that soaking the well can significantly increase the initial production after fracturing operation. However, there is a lack of a comprehensive review and summary of the existing literature when it comes to which scientific-soaking system should be selected in a specific situation. Based on the research results of domestic and foreign scholars on the mechanism of reservoir reconstruction and damage, model, influencing factors and engineering process of fluid-rock reaction during shale gas well soaking, we systematically summarize the yield-increasing mechanism and the existing soaking system. The results show that the fluid rock reaction is the essence of soak production under reservoir conditions, and the degree of fluid-rock reaction is the key to formulate soaking system. The interaction of fluid-rock during well soaking can both contribute and damage the reservoir. The transformation of the reservoir includes the initiation and expansion of micro fractures and gas liquid imbibition displacement; the damage to the reservoir includes solid phase plugging during fluid-rock reaction and water phase trap caused by fracturing fluid intrusion. Establishing an unknown bridge between fluid-rock interaction and effective pore structure parameters of reservoir is the key to the study of the systems of soaking. In view of the cross scale and highly nonlinear problems that restrict the research on fluid-rock interaction, the author proposed an effective fracture characterization model based on molecular dynamics and an industrial artificial intelligence optimization model for shale gas well soak.

Key words: shale gas, fluid-rock reaction, soaking system, micro-fracture initiation, formation damage

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