低渗气藏变井储试井分析研究  

Well Testing Analysis and Research on Variable Wellbore Storage in Low Permeability Gas Reservoir

作　　者：陈艳芳[1] 赵宏军[1] 

机构地区：[1]联合能源东方勘探开发研究院保利科技有限公司,北京100101

出　　处：《油气井测试》2017年第3期33-35,38,共4页Well Testing

摘　　要：低渗气藏大范围内压力恢复时变井储效应将对井底压力动态产生重要影响,通常采用Hegeman和Fair变井储数学模型进行分析求解,并系统分析变井储时各参数对压力动态的影响及压力导数曲线特征。模型通常包含两个重要的参数C_i/C_f和Delta t,在试井解释过程中,通过对其进行特征化拟合来实现描述早期变井储效应,从而更好地识别中期的储层特征。通过对巴基斯坦油气项目中MKK北区某气田W-1气井的试井实例分析,说明变井储模型在试井模型中的合理应用。此外,基于变井储涉及的三个参数C_i/C_f、Delta t和表皮系数S,利用Saphir试井软件中的试井设计和敏感性分析功能对早期压力响应进行敏感性分析。根据敏感性分析,结果认为,早期变井储模型的识别比较关键,否则会对中期储层的识别带来干扰,甚至造成试井解释的不正确。Variable wellbore storage effect will have important impact on the bottom hole dynamic pressure at pressure recovery time in wide scope of the low permeability gas reservoir,so,Hegeman and Fair mathematical models are usually adopted to acquire solution,and the influence of various parameters on the dynamic pressure and pressure derivative curve characteristics are systematically analyzed at changing wellbore storage time. It generally contains two important parameters of C_i/C_fand Delta t,and through the study of the characteristic of the fitting to describe early changing wellbore storage effect in the process of well test interpretation,so as to the middle of reservoir characteristics is identified better. By well testing field analysis of W-1 gas well at MKK north district in Pakistan's oil and gas projects,it shows that the variable wellbore storage model is applied reasonably in well testing model. In addition,based on three parameters of C_i/C_f,Delta t and S involved changing wellbore storage,functions of well testing design and sensitivity analysis in Obama well testing software are used to conduct sensitivity analysis of the early pressure response. Through the sensitivity analysis,the result shows that recognition of early well changing storage model is very critical,otherwise,it will interfere with the recognition of middle reservoir and even cause the incorrect well test interpretation.

关 键 词：Hgeman Fair变井储效应 试井分析 低渗气藏 MKK北区 敏感性分析 

分 类 号：TE353[石油与天然气工程—油气田开发工程]