边水气藏水侵动态分析方法及水侵主控因素  

Water invasion performance and main controlling factors for edge-water gas reservoirs

作　　者：秦正山 何勇明[1] 丁洋洋 李柏宏 孙双双 QIN Zhengshan;HE Yongming;DING Yangyang;LI Baihong;SUN Shuangshuang(School of Energy,Chengdu University of Technology,Chengdu 610000,China;No.6 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi’an 710000,China)

机构地区：[1]成都理工大学能源学院,成都610000 [2]中国石油长庆油田公司第六采油厂,西安710000

出　　处：《岩性油气藏》2024年第4期178-188,共11页Lithologic Reservoirs

基　　金：成都理工大学研究生拔尖创新人才培育项目“含水层储气库注采过程地层干化盐析损伤机理及数学模型研究”(编号:CDUT2022BJCX005)资助。

摘　　要：基于经典分流理论与气水渗流规律,推导了考虑气体高速非达西渗流的边水气藏分流方程,并根据四川盆地某边水气藏多口产水气井的基础资料,分析了水侵动态特征参数的变化规律及主控因素,探讨了延缓气藏水侵的技术思路与对策。研究结果表明:(1)新的改进分流方程能够确定不同开发时刻气藏(或气井)边水的整体推进情况及见边水时间,相较于传统的基于达西定律的分流方程,该计算结果更加可靠。(2)边水气藏水侵动态受制于多种因素的综合影响,其中储层渗透率对其影响最为显著,其次为非达西流系数、相对渗透率及孔隙度,而有效厚度、供气边界及水侵流量的影响程度较小。(3)充分发掘物性较均一的低渗致密段储层的开发潜力是提升边水气藏开发效果的关键,制定合理的气藏采气强度是主动控水、稳水的重要手段。Based on classical fractional flow theory and gas-water percolation law,the fractional flow equation for edge-water gas reservoirs considering high-speed non-Darcy flow of gas phase was derived.The characteristic parameters and controlling factors of water invasion performance were analyzed based on the data of multiple water-producing gas wells in an edge-water gas reservoir in Sichuan Basin,and the technical approaches and strategies for delaying water invasion in gas reservoirs were discussed.The results show that:(1)The derived fractional flow equation can determine the overall advancement and breakthrough time of edge water in the reser‐voir(or gas well)at different development times,and the calculation results are more reliable than that by the traditional Darcy flow model.(2)The water invasion performance of the edge-water gas reservoirs is affected by a combination of multiple factors,the reservoir permeability has the most significant influence,followed by non-Darcy flow coefficient,relative permeability and porosity,while effective thickness,gas supply boundary and water invasion flow rate are less influential.(3)Fully exploiting the development potential of low-permeability and tight reservoirs with relatively uniform physical properties is the key to enhancing the development effectiveness of edge-water gas reservoirs,and formulating a reasonable gas recovery intensity is an important means to actively control and stabilize water.

关 键 词：分流理论 水侵动态 非达西流 熵权法 物性 有效厚度 供气边界 水侵流量 低渗致密储层 采气强度 边水气藏 

分 类 号：TE312[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]