【作者】 肖晓春；

【导师】 潘一山；

【作者基本信息】 辽宁工程技术大学 ， 固体力学， 2005， 硕士

【摘要】 我国煤层气资源有66%赋存在地下千米以下,在此深度下煤层的抗压强度较低,煤层气开采已经属于深部开采。而进入深部开采后出现了许多新的影响因素使得原有的浅部煤层气渗流模型不再适用,因此本文建立了考虑滑脱效应及孔隙压力的煤层气渗流模型,建立了考虑滑脱效应及温度场耦合的煤层气渗流的数学模型,建立了考虑滑脱效应的水气耦合煤层气渗流数学模型。通过有限元数值手段分析了不同渗透率情况下综合考虑滑脱效应、孔隙压力、温度场和两相耦合作用等深部因素对煤层气渗流场的影响。得到了滑脱效应在衡量煤层气可采性和煤层气产量预测上有着正面的影响;而孔隙压力和温度场都会对煤层气的可采性和产量预测产生不利的影响等结论。建立的水气两相耦合的煤层气渗流数学模型能更为真实的描述煤层气渗流的规律,为研究煤层气非线性渗流理论奠定了一定的理论基础。本文使用有限元方法对建立的煤层气非线性渗流的控制方程近似求解。为煤层气的大规模工业化开发和产量预测提供了理论指导。更多还原

【Abstract】 The 66% of coalbed methane resource of our country is deposited under one kilometer, the compression intensity of the coal seam is relatively lower under this depth, the coalbed methane exploitation belongs to deep exploitation. Under this condition, a lot of new influence factors appear, the superficial model of coalbed methane is no longer suitable, so we set up the coalbed methane seepage model considered slip effect and porosity pressure, set up the coalbed methane seepage model considered coupling of slip effect and temperature field, set up the coalbed methane seepage model considered coupling of the slip effect and two phase of water - gas in this paper. Through numerical method, we can analyse the influence of coalbed methane seepage field that considered deep factors such as slip effect, porosity pressure, temperature field and two phase of water - gas. We can get the conclusion that slip effect has favorable influence on aspect of weighting coalbed methane exploitation and output of coalbed methane prediction, temperature field and porosity pressure have unfavorable influence on this aspect. The coalbed methane seepage model considered the coupling of slip effect and two phase of water - gas is truer describes the law of coalbed methane seepage, establishes the foundation for studying the non-linear seepage question of coal-bed methane. In this paper we utilize finite element program to calculate the non-linear seepage model. It has significant academic value to estimate the output of the coal-bed methane and industrial exploitation.更多还原