非常规储层微纳米孔隙介质中流体相态研究进展  

Research progress of fluid phase behavior in micro-nano porous media of unconventional reservoirs

作　　者：汪周华[1] 范琨鹏 赵建飞 余曹 匡红先 郭平[1] 涂汉敏 WANG Zhouhua;FAN Kunpeng;ZHAO Jianfei;YU Cao;KUANG Hongxian;GUO Ping;TU Hanmin(Southwest Petroleum University,Key Laboratory of Petroleum Reservoir Geology and Development Engineering,Chengdu,Sichuan 610500,China;Chengdu Exploration and Development Research Institute of Daqing Oilfield,Chengdu,Sichuan 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程重点实验室,四川成都610500 [2]大庆油田成都勘探开发研究院,四川成都610500

出　　处：《世界石油工业》2024年第3期68-77,共10页World Petroleum Industry

基　　金：国家自然科学基金面上基金“微纳米孔界面效应影响多组分烃流体相变特征研究”(52074236)。

摘　　要：非常规油气储层具有岩石骨架颗粒小、比表面积大、微纳米孔隙发育的特点,流体与孔隙介质间存在着诸多复杂的界面效应问题,影响微纳米孔隙介质中流体的相态变化规律。对于受限域流体,经典油气相态理论方法忽略分子间相互作用及界面效应的影响,预测微纳米孔隙介质中流体相变特征存在偏差。为了更全面地揭示油气在受限空间中的相态特征及其微观作用机理,总结当前微纳米孔隙介质中流体相态研究技术现状,详细阐述微观实验测试、相态理论模型和分子模拟3种主流技术方法,指出3种技术各自的优缺点,并对未来流体相态研究技术提出展望。分析认为:微观实验测试方法可通过研究流体热力学参数的变化来确定流体相变点,由于实验误差、人为误差等原因,需与理论计算相结合;相态理论模型方法可通过改进临界参数场、考虑流体与孔壁界面作用、考虑相间毛管压力修正相平衡判据方程等方法建立纳米孔隙空间相态理论模型,但是由于没有综合考虑界面效应带来的影响且缺乏有力的实验数据支撑,难以推广应用;分子模拟方法能在分子尺度上揭示流体分子的相行为,但现有研究主要围绕小分子展开,并且与流体发生相变时的临界参数结合得较少。后续研究应以多界面效应耦合影响的微纳米孔隙介质中油气流体相变特征为研究对象,以微观实验、理论模型和分子模拟为技术手段,为描述微纳米孔隙介质中流体相态提供合理的实验测试手段和可靠的理论计算模型。Unconventional oil and gas reservoirs have the characteristics of small rock skeleton particles,large specific surface area and micro-nano pore development.There are many complex interface effects between fluid and porous media,which affect the phase change law of fluid in micro-nano porous media.For confined fluid,the classical oil and gas phase theory method ignores the influence of intermolecular interaction and interface effect,there is a deviation in predicting the phase transition characteristics of fluid in micro-nano porous media.In order to reveal the phase behavior characteristics and microscopic mechanism of oil and gas in confined space more comprehensively,the current research status of fluid phase behavior in micro-nano porous media is summarized.The three mainstream technical methods of microscopic experimental test,phase behavior theoretical model and molecular simulation are described in detail.The advantages and disadvantages of the three technologies are pointed out,and the future research technology of fluid phase behavior is prospected.According to the analysis,the microscopic experimental test method can determine the phase transition point of the fluid by studying the change of the thermodynamic parameters of the fluid,but due to the experimental error,human error and other reasons,it needs to be combined with the theoretical calculation.The phase theory model method can establish the phase theory model of nanopore space by improving the critical parameter field,considering the interaction between fluid and pore wall,and considering the phase equilibrium criterion equation of interphase capillary pressure correction.However,it is difficult to popularize and apply due to the lack of comprehensive consideration of the influence of interface effect and the lack of strong experimental data support.The molecular simulation method can reveal the phase behavior of fluid molecules on the molecular scale,but the existing research mainly focuses on small molecules,and is less combined with the critic

关 键 词：流体相态 微观实验测试 相态理论模型 分子模拟 油气藏开发 

分 类 号：TE319[石油与天然气工程—油气田开发工程] U175[交通运输工程]