裂缝性致密油藏体积压裂水平井压力动态分析  

Pressure Behavior Analysis of Volume Fracturing in Horizontal Wells in Fractured Tight Oil Reservoirs

作　　者：武治岐[1] 王厚坤 王睿[3] WU Zhiqia;WANG Houkunb;WANG Ruic(PetroChina Xinjiang Oilfield Company,a.Heavy Oil Development Compan;b.Researeh Institute of Engineering Technolog;e.No.1 Oil Production Plant,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司重油开发公司,新疆克拉玛依834000 [2]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [3]中国石油新疆油田分公司采油一厂,新疆克拉玛依834000

出　　处：《新疆石油地质》2018年第3期333-339,共7页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05055-002-002)

摘　　要：基于格林函数、镜像反演及压力叠加原理,建立了箱式封闭边界裂缝性致密油藏体积压裂水平井压力动态分析半解析模型,模型使用经典的Warren-Root模型表征体积改造区域内基质—裂缝间渗流关系及裂缝系统空间展布,考虑了相邻主裂缝间压力干扰,能更好地描述储集层渗流特征,解释参数更符合实际情况。并利用建立的模型对裂缝数、裂缝半长、裂缝间距、储容比和窜流系数等相关参数敏感性进行分析。结果表明,在双对数曲线图版上井底压力响应过程可划分为人工裂缝线性流、双重介质窜流、第一径向流、第二线性流、拟径向流和封闭边界流6个渗流阶段。裂缝数对整个井底压力响应过程都有显著影响,裂缝数越多,生产压差越大,单井产能越高,裂缝数增加,生产压差增幅减小,存在一个经济最优值;裂缝半长越长,初期生产压差越大,单井产能越高;裂缝间距越大,第一径向流阶段时间相对增加,第二线性流阶段时间相对减少,生产后期压差越大,产量增幅越小;储容比越小,窜流越明显;窜流系数越小,窜流发生得越晚。Based on Green function, Mirror inversion and pressure superposition principle, a semi-analytical model for pressure behavioranalysis is established for volume fracturing in horizontal wells in fractured reservoirs with box-type closed boundaries. This model uses theclassical Warren-Root model to show the seepage relationship between matrix and fracture and the spatial distribution of fracturing systemin the volume fracturing regions, and takes the pressure interference of adjacent main fractures into consideration. So the reservoir seepagecharacteristics can be described better and the interpretation parameters are more consistent with the actual situation. The paper uses themodel to analyze the sensibilities to parameters such as fracture number, fracture half-length, fracture interval, storage ratio and interporosi-ty flow coefficient. The results show that the response process of bottom hole pressure can be divided into 6 flow stages based on the doublelogarithm curve chart, i.e., linear flow of artificial fracture, interporosity flow of dual medium, the first radial flow, the second linear flow,pseudo-state radial flow and closed boundary flow. Fracture number has significant influences on the whole response process—the largerthe fracture number and the producing pressure drop are, the higher the single well deliverability will be. The growth of producing pressuredrop decreases with the increase of the fracture number. There is an optimal economic value in a volume fracturing horizontal well. The sin-gle well deliverability and the producing pressure drop at the early production stage will increase with the increase of fracture half-length. Ifthe fracture interval increases, the effective time of the first radial flow will increase and that of the second radial flow will decrease. At thelate production stage, the larger the producing pressure drop is, the smaller the growth of the deliverability will be; the smaller the storageratio is, the more obvious the fluid channeling will be; the smaller the interpo

关 键 词：裂缝性致密油藏 体积压裂 水平井 压力动态分析 箱式封闭边界 点源函数解 

分 类 号：TE348[石油与天然气工程—油气田开发工程]