岩性油气藏 ›› 2019, Vol. 31 ›› Issue (5): 161–168.doi: 10.12108/yxyqc.20190519

• 石油工程 • 上一篇    

复合油藏压裂水平井复杂裂缝分布压力动态特征

徐有杰1, 刘启国1, 王瑞2, 刘义成3   

  1. 1. 西南石油大学 石油与天然气工程学院, 成都 610500;
    2. 石油工业出版社, 北京 100000;
    3. 中国石油西南油气田分公司 勘探开发研究院, 成都 610000
  • 收稿日期:2018-12-27 修回日期:2019-04-08 出版日期:2019-09-21 发布日期:2019-09-16
  • 第一作者:徐有杰(1990-),男,西南石油大学在读博士研究生,研究方向为油气田开发及试井分析。地址:(610500)四川省成都市新都区新都大道8号西南石油大学石油与天然气工程学院。Email:xuyoujie920309@163.com
  • 通信作者: 刘启国(1969-),男,博士,教授,主要从事渗流力学及试井分析方面的教学和科研工作。Email:liuqg2002@163.com。
  • 基金资助:
    国家重大科技专项“低渗-致密油藏高效提高采收率新技术”（编号：2017ZX05009-004）和“深层碳酸盐岩气藏高效开发技术”（编号：2016ZX05015-003）联合资助

Pressure transient of fractured horizontal well with complex fracture distribution in composite reservoir

XU Youjie1, LIU Qiguo1, WANG Rui2, LIU Yicheng3   

  1. 1. School of Oil & Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. Petroleum Industry Press, Beijing 100000, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610000, China
  • Received:2018-12-27 Revised:2019-04-08 Online:2019-09-21 Published:2019-09-16

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摘要： 压裂改造是提高油田产量、改善井筒附近储层物性的重要方法，但在实际多段压裂体积改造过程中，由于地层条件复杂，导致井筒附近形成了复杂的缝网体积，因此，加强对水平井体积压裂改造试井模型的研究十分必要。基于体积压裂水平井复杂裂缝分布的渗流特征，建立径向复合多段压裂水平井试井解释数学模型，耦合储层与裂缝模型解求得Laplace空间井底压力半解析解，应用Duhamel原理得到考虑井储和表皮影响的Laplace空间井底压力解，利用Stehfest数值反演求得实空间井底压力，并绘制实空间压力动态特征曲线。根据压力导数曲线特征划分流动阶段，通过模型验证证明了该方法的正确性，进而分析了裂缝不对称、裂缝夹角、裂缝分布方式、内区半径和流度比对特征曲线的影响。结果表明，裂缝不对称交错分布有助于增大裂缝控制面积，从而减少流体流入井筒的压力消耗，早期阶段对应的压力曲线也越低；内区半径越大，压裂改造效果越明显，对应压力曲线越靠下。该模型可为多段压裂水平井所形成的复杂裂缝试井资料解释和压裂方案设计提供理论依据。

关键词: 多段压裂水平井, 复杂裂缝分布, 压力动态, 裂缝不对称, 复合油藏

Abstract: Hydraulic fracturing technology is a vital method to increase oil field production and improve reservoir properties near wellbore. In the actual process of multi-stage fracturing volume modification,complex fracture network volume formed near wellbore due to complex formation conditions. Therefore,it is necessary to strengthen the study of volume fracturing modification test model of horizontal well. Based on the seepage characteristics of complex fracture distribution for multi-stage fractured well,a well-test mathematic model of radial composite multi-stage fractured well was established. Wellbore pressure was obtained by coupling reservoir and hydraulic fracture in Laplace domain,and the impact of wellbore storage and skin factor were considered by employing Duhamel principle. Applying Stehfest numerical inversion algorithm,wellbore pressure in real time domain can be calculated and pressure response log-log curve were plotted,and flow regimes were identified by characteristics of pressure-derivative curve. The correctness of this method was proved by model verification. The effects of fracture asymmetry factor,angle between fracture and wellbore,fracture distribution,radius of inner region and mobility ratio on characteristic curves were analyzed. The results show that the fractures of asymmetric staggered distribution are helpful to increase the control area of fractures,thereby reducing the pressure drop loss of fluid flowing into the wellbore,and larger inner radius leads to smaller pressure in log-log plot. This model can provide theoretical basis for the well-test interpretation and fracturing design of complex fracture formed by multistage fractured horizontal well.

Key words: multi-stage fractured horizontal well, complex fracture distribution, transient pressure, fracture asymmetry, composite reservoir

中图分类号: 

  • TE33+1.1
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