CAJ | 학술논문

理论分析及矿场实践表明，页岩气藏采用传统渗流模型预测的产量总是比实际产量低，经典的达西渗流定律不再具有适应性，需要建立能准确描述页岩介质气体流动行为的数学模型。目前针对页岩气藏的渗流模型基本都是对传统黏性流动的校正或者在黏性流动模型上简单的附加分子流动项，忽略了黏性流与分子流中间流态的问题。考虑页岩介质中可能存在不同流态，建立了描述页岩气藏的流动分析模型。计算结果表明：页岩储层的孔隙越小、气体分子摩尔质量越小、地层压力越低，气体流动越倾向表现为微观流态，表观渗透率与达西渗透率的比值越大。模型可解释页岩气藏生产时实际产量高于达西模型预测产量，该研究对于指导页岩气藏生产具有重要的指导意义。
이론분석급광장실천표명，혈암기장채용전통삼류모형예측적산량총시비실제산량저，경전적체서삼류정률불재구유괄응성，수요건립능준학묘술혈암개질기체류동행위적수학모형。목전침대혈암기장적삼류모형기본도시대전통점성류동적교정혹자재점성류동모형상간단적부가분자류동항，홀략료점성류여분자류중간류태적문제。고필혈암개질중가능존재불동류태，건립료묘술혈암기장적류동분석모형。계산결과표명：혈암저층적공극월소、기체분자마이질량월소、지층압력월저，기체류동월경향표현위미관류태，표관삼투솔여체서삼투솔적비치월대。모형가해석혈암기장생산시실제산량고우체서모형예측산량，해연구대우지도혈암기장생산구유중요적지도의의。
Shale gas reservoir theory and field practices showed that the actual yield is higher than the predicted production of traditional seepage flow model,and that classic Darcy percolation law cannot fully describe the shale gas flow behavior of the shale media. Thus a calculation model for accurate description and calculation of gas flow of shale media needs to be established. Existing shale gas reservoir seepage flow models are the correction to traditional viscous flow by simply attached molecular flow,which ignored the middle flow state of the molecular flow and viscous flow,especially for characterization of transition flow. This paper considers different complex flow pattern in shale media to established gas flow analysis model of describing the shale reservoir. The calculation results show that the smaller the porosity of shale reservoir is,the smaller the gas molecular molar mass is and the lower formation pressure could be,the easier gas flow shows the micro flow regime, and the greater the ratio of the apparent permeability to Darcy permeability is. The model reveals the essential reason why the shale reservoir actual yield is higher than predicted yield of Darcy model,and the research has significant guiding importance to direct shale gas reservoir production.