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层间不渗透多煤层气储层渗流数学模型的建立

发表时间:2014-11-15  浏览量:1445  下载量:406
全部作者: 杜肖,郝树青
作者单位: 丹阳市建设工程质量检测中心;中国矿业大学资源与地球科学学院
摘 要: 研究应用煤层气地质学、渗流力学、石油天然气地质学等学科的理论和方法,在国内外文献资料的基础上,就多年来国内外关于多煤层气渗流方面的研究进展进行论述并建立层间不渗透多煤层气储层渗流数学模型。模型的建立借鉴了油气田开发应用中研究相对较成熟的多储层合采系统,并将煤层气体复杂的热力学性质引入渗流方程中,结合多层稳态渗流的控制方程建立层间不渗透多煤层气的数学模型,实现了渗流过程中压力场与应力场2个物理场的强耦合,使得该模型具有一定的非线性。通过对模型的探讨有如下结论:由于层间不渗透层的阻隔作用,使得临近层位储层压力有较大差异,在这种情况下如果要进行联合开采,就必须针对不同储层的压力差异特点制定开采方案;多煤层的开采对上覆岩层的垂向位移、水平移动、沉降速度等较单一煤气层的开采影响程度明显加大,因此对不同间距、不同储层压力的多煤层气联合开采时的层间影响规律研究具有重要意义;所建立的模型能够概括煤气层在多煤层系统中的运移规律,可以为煤气层渗流开采数值模拟提供便利。
关 键 词: 煤田地质学;多煤层气藏;渗流;越流;数学模型
Title: Establishment of the numerical model of multiple coal bed methane impervious reservoir stratum
Author: DU Xiao, HAO Shuqing
Organization: Construction Projects Quality Inspection Center of Danyang; School of Resource and Earth Science, China University of Mining and Technology
Abstract: Based on the research progress both at home and abroad for many years on the academic sector of multiple seam’s transfusion, and applied the theory and method of coal bed methane geology, seepage flow mechanics, petroleum geology, a mathematical model of multiple seam’s transfusion have been built. The mathematical model takes example by combined method in the exploit of oil and gas field, and the character of thermodynamics have been considered, so pressure field and stress field achieved strong coupling, and make the mathematical model have the character of non-linear. The conclusions have been made through discussion of the model. Because of impermeable barrier between the layers, the near horizon differ from that of reservoir pressure, in this case, if wants to undertake joint exploration, We must make mining plan according to different reservoir characteristics of the pressure difference. For more seam mining overburden of vertical displacement and horizontal direction, settling velocity and so on a single coal seam mining shadow is significantly increased, thus reservoir pressure with different spacing, different layers of the combined mining of coal bed methane influence law research has the vital significance. The established model can sum up the migration rule of coal bed methane in coal seams more system, which can provide convenience for mining coal bed methane seepage numerical simulation.
Key words: coal geology; multiple coal bed methane reservoir; percolation; cross-flow; mathematical model
发表期数: 2014年11月第21期
引用格式: 杜肖,郝树青. 层间不渗透多煤层气储层渗流数学模型的建立[J]. 中国科技论文在线精品论文,2014,7(21):2130-2135.
 
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