低阶煤储层气-水两相多机理流动规律及数值模拟研究

项目名称： 低阶煤储层气-水两相多机理流动规律及数值模拟研究

项目编号： No.11302265

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张先敏

作者单位： 中国石油大学（华东）

项目金额： 23万元

中文摘要： 本项目针对低煤阶煤储层特殊的孔隙结构及流体赋存特征，开展地应力场作用条件下低煤阶煤层气的吸附/解吸实验及其与渗流间的相互作用机理实验研究，揭示真实低煤阶煤储层条件下受地应力场和温度场等耦合作用的煤层气吸附/解吸规律以及吸附/解吸变形与渗流间的相互作用规律；综合考虑吸附/解吸作用以及应力场、渗流场和浓度场的耦合作用，建立可更为准确描述低煤阶煤储层条件下气-水两相多机理运移的数学模型，并编制相应的模拟计算程序。在此基础上，考虑煤层的非均质性特征及卸压开采特点，以煤层大范围持续均衡降压以及经济效益最大化为目标，结合改进的粒子群优化算法，建立一套新的低煤阶煤层气井网自动优化理论方法，并开展相关的概念井网优化设计分析，为我国低煤阶煤层气的大规模商业开发提供重要的理论基础。

中文关键词： 低煤阶；煤层气；解吸；粒子群优化算法；井网

英文摘要： The exploration and development of low-rank coal bearing areas and its corresponding foundamental research are relatively weak,and the systematic study on the well pattern optimization is relatively few. According to the the special pore structure and fluid occurrence characteristics in coalbed methane reservoirs, the project will conduct the adsorption and desorption experiments under ground stress state and their interaction mechanism experiments with seepage flow,in order to further clarify the interaction mechanism between desorption phenomenon in the matrix and seepage flow of fluids through the macropores under the actual reservoir condition, followed by an establishment of mathematical and numerical models concerning the multi-mechanism of gas-water flow, and a relevant simulation program about them will be worked out. On such basis, a new optimizor of broader universality and greater portability applying the particle swarm optimization algorithom, with two seperate fitness functions of net present value and large-scale isostatic pressure drawdown is to be framed and uesd to guide the low-rank coalbed methane development.As a whole, the above research is of great significance in promoting the all-round development of low-rank coalbed methane industry.

英文关键词： low-rank coal；coalbed methane；desorption；Particle Swarm Optimization；well pattern