西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (3): 147-157.DOI: 10.11885/j.issn.1674-5086.2015.03.06.02

• 石油与天然气工程 • 上一篇    下一篇

储层注气引起地表变形的全场建模与分析

李宏1,2, 郑丽娜1, 刘建军3   

  1. 1. 大连理工大学土木工程学院, 辽宁 大连 116024;
    2. 大连理工大学海岸和近海工程国家重点实验室, 辽宁 大连 116024;
    3. 西南石油大学地球科学与技术学院, 四川 成都 610500
  • 收稿日期:2015-03-06 出版日期:2017-06-01 发布日期:2017-06-01
  • 通讯作者: 李宏,E-mail:hong.li@dlut.edu.cn
  • 作者简介:李宏,1969年生,男,汉族,辽宁沈阳人,教授,博士,主要从事油藏开发及储层流动数值模拟、多场耦合数值计算及程序开发、边坡节理岩体渗流、储层岩土力学方面的研究。E-mail:hong.li@dlut.edu.cn郑丽娜,1991年生,女,汉族,山东菏泽人,硕士,主要从事油藏开发及储层流动数值模拟、多场耦合数值计算及程序开发、储层岩土力学方面的研究。E-mail:xinongllina@163.com;刘建军,1972年生,男,汉族,河南襄城人,教授,博士生导师,主要从事渗流力学及其多场耦合理论及应用研究。E-mail:liujj0906@163.com
  • 基金资助:
    国家重点基础研究发展计划(973计划)(2011CB013503;2014CB047100)

Full-Field Modeling and Analysis of Surface Deformations Induced by Gas Injections into Reservoirs

LI Hong1,2, ZHENG Lina1, LIU Jianjun3   

  1. 1. School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;
    2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;
    3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2015-03-06 Online:2017-06-01 Published:2017-06-01

摘要: 对储层注气引起地表变形的模拟分析,可用于储层工程灾害预测、指导设计监测岩层变形的倾斜仪安置阵列、校准现有地质模型等,是有效监测地表变形、实施施工过程历史拟合、反演与预测深部储层行为的基础。为对其提供有效的模拟分析,自主研发了用户可控的大规模网格化离散方法,将Eclipse储层模型自动转换并延伸成FLAC3D全场地质模型,将Eclipse储层流动分析结果转换使其为FLAC3D岩石力学分析所用,从而实现复杂地质结构储层流动与近远场岩石力学效应的单向耦合。基于此模拟了某大型咸水层二氧化碳封存项目注气一定时间后的地表变形。由于储层注气渗流过程引起的岩体变形在远场十分微小,必须进行高精度的数值计算,而常规模拟流程遇到逼近能力局限性等特殊问题,揭示了其原因并给出了解决方案;探讨了地质模型中储层下伏岩层的厚度对模拟精度的影响。

关键词: 注气过程, 地表变形监测, 全场数值模拟, 单向耦合

Abstract: The simulation analysis of ground surface deformation caused by gas injection into reservoir can predict working hazards in the reservoir, provide design guidance of tiltmeter arrays for monitoring rock strata deformations, and calibrate current geological models.It is thus the basis for monitoring ground surface deformations in an effective manner, implementing history matching for practical processes, and inversions and predictions of deep-lying reservoirs.To provide an effective simulation analysis, we have developed a user-controllable large-scale gridding discretization method that automatically converts Eclipse reservoir models and extends them into FLAC3D full-field geological models, and transforms Eclipse reservoir flow analyses into usable data for FLAC3D rock mechanics analyses. Thus realizes one-way coupled reservoir simulation-geomechanical modelling. On this basis, we have simulated surface deformation in a large-scale saline aquifer CO2 storage project that occur after gas injection. Highly accurate numerical computations are required for these studies as the rock mass deformations induced by permeation processes during reservoir injection are very minute. Here, we have demonstrated the causes and have provided solutions for special problems that are encountered during conventional simulation processes, such as limitations in their capacity for approximation. In addition, we have investigated the effect of the underlying stratum thickness of reservoirs in geological models on simulation accuracies.

Key words: reservoir gas injection processes, ground surface deformation monitoring, full field reservoir modelling, one-way coupling

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