摘要
从物理模拟、数值模拟和理论计算3个方面总结了边底水气藏水侵研究成果。在物理模拟方面,主要通过CT扫描、核磁共振、微观可视化和衰竭开采实验等手段研究剩余气形成机理及其分布特征,水相从高渗孔缝绕流进入低渗孔缝产生的绕流封闭气多存在于孔洞型储层,储层基质自吸水相产生的水锁封闭气多存在于孔隙型储层,气水界面能量最小化产生的卡断封闭气多存在于缝洞型储层。在数值模拟方面,对比了LBM和Level-set 2种方法的优缺点,通过LBM方法可研究毛管自吸、黏性耦合、湿相润滑及表观滑移等微观力学机制对气水两相渗流的影响,这4种作用效果越强,则气藏水侵越严重,采出程度越低,而Level-set方法侧重于描述气水界面的拓扑变化,当驱动压力达到一定阈值后,对应毛管中的气水界面开始运移,运移过程中毛管数>10^(-4)时,气相不易发生卡断,剩余气相对集中。在理论计算方面,总结了适用于不同气藏的水侵量及动态储量计算方法,通过分阶段的流动物质平衡方法可使计算误差<3%。最后,总结了各类研究方法及现有研究成果的不足,建议今后的研究重点应包括提高储层描述精度、完善物理模拟相似准则、整合并量化各类研究成果、强化室内实验成果的矿场应用4个方面。
The research results of edge and bottom water gas reservoirs were summarized from three aspects:physical simulation,numerical simulation and theoretical calculation.In terms of physical simulation,the forma⁃tion mechanism and distribution characteristics of residual gas are mainly studied by means of CT scanning,nu⁃clear magnetic resonance,microscopic visualization and depletion develop experiments.The trapped-gas gener⁃ated by the aqueous phase flowing from the high-permeability pore gap into the low-permeability pore gap is mostly present in the hole-type reservoir,the water-locked gas generated by the self-infiltration aqueous phase of the reservoir matrix is mostly present in the pore-type reservoir,and the cut gas generated by minimizing the energy-water interface is mostly present in the fracture-cavern type reservoir.In terms of numerical simulation,the advantages and disadvantages of LBM and Level-set methods were compared,and the influence of microme⁃chanical mechanisms such as capillary self-priming,viscous coupling,wet-phase lubrication and apparent slip on gas-water seepage can be studied through the LBM method.The stronger the effect of these four effects,the more serious the water invasion of the gas reservoir and the lower the recovery,while the Level-set method fo⁃cuses on describing the topological change of the gas-water interface,when the driving pressure reaches a cer⁃tain threshold,the corresponding gas-water interface in the capillary begins to migrate.When the number of cap⁃illaries>10^(-4) during migration,the gas phase is not easy to break,and the residual gas is relatively concentrat⁃ed.In terms of theoretical calculation,the calculation methods of water inversion and dynamic reserves suitable for different gas reservoirs are summarized,and the calculation error can be<3%through the sublevel flow ma⁃terial balance method.Finally,based on various research methods and the shortcomings of existing research re⁃sults,it is suggested that future research should focus on imp
作者
杨东升
谢坤
殷庆国
卢祥国
肖京池
沈伟军
YANG Dongsheng;XIE Kun;YIN Qingguo;LU Xiangguo;XIAO Jingchi;SHEN Weijun(Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education,Northeast Petroleum University,Daqing 163318,China;Petroleum Engineering Research Institute of PetroChina Dagang Oilfield Company,Tianjin 300280,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2024年第7期1304-1322,共19页
Natural Gas Geoscience
基金
国家自然科学基金面上项目“深层页岩气水赋存特征及流动机理研究”(编号:12172362)资助。
关键词
气藏水侵
物理模拟
数值模拟
水侵动态
发展方向
Water intrusion of gas reservoir
Physical simulation
Numerical simulation
Water intrusion dynamics
Direction of development
