摘要
气体在低渗透异常高压气藏中的渗流为偏离达西规律的非线性渗流,常规气藏数值模拟技术基于达西定律,无法对这种非线性渗流予以准确描述。基于以前的研究成果,通过分析启动压差、变形介质对低渗透异常高压气藏渗流的影响,建立了低渗透异常高压气藏的三维气、水两相非线性渗流数学模型,模型可以考虑多种非线性渗流对气藏开发动态的影响。利用该模型对四川某低渗透异常高压气藏典型井进行了数值模拟研究,模拟单井增压与不增压开采方案,对比结果表明,低渗透异常高压气藏采用增压开采,生产效果可得到明显改善。模拟单井采用增压开采后,当产气量为11×104 m3/d时,稳产期为8.5 a,采出程度为60.06%,与不增压开采相比,稳产期延长1 a,采出程度提高8.37%。
Gas flow in a low permeable and abnormal high pressure gas reservoir shows non-linear flow that is not in accordance with the Darey＇s law,the conventional gas reservoir simulation technology that is based on the Linear Darcy＇s law can not describe accurately the seepage of nonlinear flow of gas in such reservoir.Based on previous research results,the nonlinear flow mathemati-cal model which is established on three-dimensional gas and water two-phase in low permeable and abnormal high pressure gas reservoir can consider the influence of variable non-linear flow on gas reservoir development.Numerical simulation of the typical well in a low permeable and abnormal high pressure gas reservoir in Sichuan is carried out by this model,and the contrast between simulated boost pressure mining and non-boost pressure mining indicates that the production performance of boost pressure mining is improved significantly in low permeable and abnormal high pressure gas reservoir.After simulated boost pressure mining in the single well,when daily gas production is 11×104m3/d,the stable production time may be maintained by 8.5 years.Compared with non turbo-charged mining,the stable production time is extended by 1 year,and EOR enhanced by 8.37%.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第1期80-84,116-117,共5页
Petroleum Geology and Recovery Efficiency
基金
教育部博士点基金项目"低渗透油气藏非线性渗流机理研究"(20040615004)
关键词
低渗透气藏
异常高压
启动压力梯度
介质变形
数值模拟
low permeability
abnormally high pressure
threshold pressure
medium deformation
numerical simulation
