岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 194–200.doi: 10.12108/yxyqc.20250318

• 石油工程与油气田开发 • 上一篇    

非均质储层致密气藏压裂井复杂缝多井干扰数值试井模型

徐有杰1,2, 任宗孝1, 向祖平3, 樊晓辉4, 于梦男5   

  1. 1. 西安石油大学 陕西省油气井及储层渗流与岩石力学重点实验室, 西安 710065;
    2. 重庆科技大学重庆非常规油气开发研究院, 重庆 401331;
    3. 重庆科技大学 石油与天然气工程学院, 重庆 401331;
    4. 中国石油长庆油田公司 勘探开发研究院, 西安 710018;
    5. 中国石油辽河油田公司 勘探开发研究院, 辽宁 盘锦, 124000
  • 收稿日期:2024-03-04 修回日期:2024-06-24 发布日期:2025-05-10
  • 第一作者:徐有杰（1990—），男，博士，讲师，主要从事渗流力学及试井分析方面的教学与研究工作。地址：（401331）重庆市沙坪坝区大学城东路20号。Email：xuyoujie920309@163.com。
  • 通信作者: 任宗孝（1989—），男，博士，副教授，主要从事油气田数值模拟及采油气工程方面的教学与研究工作。Email：zxren@xsyu.edu.cn。
  • 基金资助:
    重庆科技大学科研资助项目“基于边界元法的不规则边界致密气压裂井复杂裂缝渗流模型研究”（编号：ckrc 20231215）、重庆市科技局面上项目“陆相页岩凝析气试井反演与产能预测模型研究”（编号：CSTB2024NSCQ-MSX0218）及陕西省油气井及储层渗流与岩石力学重点实验室开放基金“基于数值试井的致密含水气藏压裂井多井干扰复杂缝网智能参数反演”（编号：WSFRM20240603002）联合资助。

Numerical well testing model of fractured well with complex fractures multi-well interference in heterogeneous tight gas reservoirs

XU Youjie1,2, REN Zongxiao1, XIANG Zuping3, FAN Xiaohui4, YU Mengnan5   

  1. 1. The key laboratory of well stability and fluid & rock mechanics in Oil and gas reservoir of Shaanxi Province, Xi'an Shiyou University, xi'an 710065, China;
    2. Unconventional Oil and Gas Development Research Institute, Chongqing University of Science and Technology, Chongqing 401331, China;
    3. School of Petroleum engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
    4. Exploration and Development Research Institute, China Petroleum Changqing Oilfield Branch, Xi'an 710018, China;
    5. Exploration and Development Research Institute, China Petroleum Liaohe Oilfield Branchm, Panjing 124000, Liaoning, China
  • Received:2024-03-04 Revised:2024-06-24 Published:2025-05-10

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摘要： 基于嵌入式离散裂缝，在考虑拟启动压力梯度影响的基础上，建立非均质致密气藏压裂井复杂裂缝多井干扰数值试井数学模型，通过修正考虑拟启动压力梯度影响的传导率计算公式，改进了MRST数值模拟求解的算法。研究结果表明：①基于MRST模拟器进行模型计算，简化模型与商业软件对比结果验证了模型的准确性，拟启动压力系数越大，压降及压降导数曲线上翘幅度越大。②邻井生产方式（定产或定压）主要影响井底压降双对数曲线中后期特征，邻井定产生产使得测试井边界反映特征提前表征，邻井定压生产使得测试井晚期双对数曲线表现出先上翘后下掉特征。③邻井裂缝参数及离散裂缝对测试井井底压力曲线影响较小，测试井诱导缝导流能力使得双线性流阶段压降导数曲线表现出明显的下凹。④测试井所在区域渗透率不变的情况下，邻井所在区域渗透率越高，测试井双对数晚期阶段干扰开始的时间越早。该研究成果对致密气藏压裂井井间干扰试井分析提供理论基础。

关键词: 非均质致密气藏, 拟启动压力梯度, 压裂井, 井间干扰, 数值试井, 非线性渗流, MRST数值模拟

Abstract: Based on Embedded discrete crack，a numerical well testing mathematical model of complex fractures and multi well interference in heterogeneous tight gas reservoirs is established，which considers the influence of the threshold pressure gradient to the permeability calculation formula. It improved the algorithm for numerical simulation based on the Multiphase Reservoir Simulator（MRST）. The results show that：（1）Based on the MRST simulator for model calculation，the accuracy of the simplified model was verified by comparing the result with commercial software. The larger the threshold pressure gradient coefficient，the greater the upward curve of the pressure drop and pressure drop derivative curve.（2）The production type of adjacent wells（constant rate or constant pressure）mainly affects the mid to late stage characteristics of the wellbore pressure drop log-log curve. The constant rate production of adjacent wells leads the boundary reflection characteristics appears in advance， while the constant pressure production of adjacent wells causes the late-stage log-log curve of the test well to show an upward trend followed by a downward trend.（3）The influence of adjacent well fracture parameters and discrete fractures on the wellbore pressure drop curve of the test well is relatively small. The induced fracture conductivity of the test well shows a significant depression of bilinear flow stage wellbore pressure drop derivative curves.（4）When the region permeability of the test well keep constant，the higher the permeability of the adjacent well is，the earlier the interference appears during late stage. The research results give a theoretical foundation for the analysis of multiple well interference well test of fractured wells in tight gas reservoirs.

Key words: heterogeneous tight gas reservoir, pseudo threshold pressure gradient, fractured well, inter-well interference, numerical well testing, nonlinear seepage, numerical simulation based on MRST

中图分类号: 

  • TE312
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