煤层气井排采动态非线性结构特征及其机理研究

项目名称： 煤层气井排采动态非线性结构特征及其机理研究

项目编号： No.41202236

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 陈玉华

作者单位： 中国矿业大学

项目金额： 24万元

中文摘要： 煤层气井排采过程，是依据水文地质条件，制定特定的排采制度，以排水降压的方式，促使煤层气通过裂隙系统不断产出的非线性过程。因此，探索在不同水文地质和裂隙系统条件下煤层气井产水、产气过程的非线性动态变化机理，对于建立稳产排采制度具有重要意义。目前常用数值模拟方法和回归分析方法难以揭示煤储层地下系统的非线性特征及演变规律。为此，本项目拟采用相空间重构和非线性时间序列方法，揭示不同煤储层水文地质单元内产水量非线性结构特征，分析产水量与其他排采参数非线性结构特征随排采过程演化的对应关系，建立煤层气井排采动态参数时间序列预测模型，进而探索排采参数的非线性演变规律及机理。研究成果有助于深刻认识煤层气排采过程中的煤储层流体渗流变化特征和规律，并为建立合理的稳产排采制度提供科学依据。

中文关键词： 煤层气；排采动态；非线性；；

英文摘要： The process of Coalbed Methane(CBM）well draniage is complicated and nonlinear,in which CBM can produce continuously from coal deposit flaw by drain depressurization, under given drainage system. Therefore, it is important to reveal nonlinear feature mechanism of the water production and gas production for establishment of the stable drainage system. At present, these methods ,regression anlysis and numerical simulation methods, are difficutlt to reveal the nonlinear fetures and evolution rules of CBM undeground system. So this project uses space reconstruction and nonlinear time series methods and reveals the nonlinear structure features of coal reservoir hydrogeology units, and analyzes the nonlinear structure features and the corresponding relations between water production and the other parameters in the drainage processes, and then explores the nonlinear rules of drainage parameters by the created time series prediction model of drainage dynamic parameters. Research results can help understand percolation characteristics and rules of coal reservoir fluid in the process of CBM drainage, and provide the scientific basis for establishing reasonable well drainage system of CBM .

英文关键词： coalbed methane；drainage dynamic；nonlinear；；