岩性油气藏 ›› 2019, Vol. 31 ›› Issue (6): 118–126.doi: 10.12108/yxyqc.20190613

• 油气田开发 • 上一篇    下一篇

缝洞型碳酸盐岩油藏水平井分形非线性渗流

姜瑞忠1, 张春光1, 郜益华2, 耿艳宏2, 余辉1, 李昊远3   

  1. 1. 中国石油大学(华东)石油工程学院, 山东 青岛 266580;
    2. 中海油研究总院有限责任公司, 北京 100028;
    3. 西安石油大学 地球科学与工程学院, 西安 710000
  • 收稿日期:2019-04-10 修回日期:2019-07-12 出版日期:2019-11-21 发布日期:2019-09-28
  • 作者简介:姜瑞忠(1964-),男,博士,教授,博士生导师,主要从事油气田开发方面的研究工作。地址:(266580)山东省青岛市黄岛区长江西路66号中国石油大学(华东)石油工程学院。Email:jrzhong@126.com。
  • 基金资助:
    国家自然科学基金项目"致密储层体积压裂缝网扩展模拟研究"（编号：51574265）以及国家科技重大专项"厚层非均质性气藏产能评价及预测技术研究"（编号：2016ZX05027-004-004）和"低渗、特低渗油藏水驱扩大波及体积方法与关键技术"（编号：2017ZX05013-002）联合资助

Fractal nonlinear seepage model of horizontal wells in fractured-vuggy carbonate reservoirs

JIANG Ruizhong1, ZHANG Chunguang1, GAO Yihua2, GENG Yanhong2, YU Hui1, LI Haoyuan3   

  1. 1. College of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. CNOOC Research Institute Co., Ltd., Beijing 100028, China;
    3. College of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710000, China
  • Received:2019-04-10 Revised:2019-07-12 Online:2019-11-21 Published:2019-09-28

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摘要： 基于欧氏空间的传统渗流理论描述缝洞型碳酸盐岩油藏的多尺度和非均质特征时存在局限性。考虑边界层和流体屈服应力的影响，描述致密基质块的非线性渗流特性，应用分形理论描述裂缝系统的分形特征，同时考虑储层的应力敏感性，建立缝洞型碳酸盐岩油藏水平井分形非线性渗流模型；应用有限元法求解渗流模型，绘制水平井压力动态曲线，并对比不同渗流模型的压力动态曲线特征，分析渗流规律，将渗流过程划分为9个特征流动阶段；对非线性参数和分形指数等相关参数进行敏感性分析，并结合测井数据将新模型应用于矿场渗流参数的解释。结果表明：非线性参数主要影响基质向裂缝系统的窜流强度，而分形指数使得压力动态曲线在渗流中后期逐渐上翘，且上翘幅度随分形指数的增大而加剧。分形非线性模型的矿场应用表明，该模型符合储层实际生产状况，对提高试井解释的准确性有指导意义。

关键词: 缝洞型, 水平井, 非线性, 分形理论, 有限元

Abstract: Traditional seepage theory based on Euclidean space has limitations in characterizing multi-scale characteristics and heterogeneity of fractured-vuggy carbonate reservoirs. Considering the influence of boundary layer and fluid yield stress,the nonlinear seepage characteristics of dense matrix blocks were described. In addition, the fractal theory was applied to describe the fractal characteristics of the fracture system and the stress sensitivity of reservoirs were considered. The fractal nonlinear seepage model of horizontal well in fractured-vuggy carbonate reservoir was established accordingly. The dynamic pressure curves of the horizontal well were drawn by applying finite element method to solve the seepage model. The seepage law was analyzed by comparing the dynamic pressure curves of different seepage models,and the seepage process was divided into nine flow stages. Then,the sensitivity analyses of parameters such as fractal index and nonlinear parameter were conducted,and combined with logging data,the new model was applied to mine field to explain the seepage parameters. The results show that the nonlinear parameters mainly affect the intensity of cross flow from matrix blocks to fracture system while the fractal index makes the dynamic pressure curves gradually upturned in the middle and late stages of the seepage, and the upwarping degree increases with the increase of the fractal index. The application of the fractal nonlinear model to the field shows that the model meets the actual production status of the reservoir and has a guiding significance for improving the accuracy of the well test interpretation.

Key words: fractured-vuggy, horizontal well, nonlinear, fractal theory, finite element

中图分类号: 

  • TE344
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