考虑介质变形的低渗透气藏数值模拟研究  

A study on numerical simulation of deformable low permeability gas reservoir

作　　者：杨二龙[1] 张建国[2] 陈彩云[3] 宋考平[1] 施红伟[4] 

机构地区：[1]大庆石油学院教育部"提高油气采收率"重点实验室,黑龙江大庆163318 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710021 [3]中国石化河南油田分公司第二采油厂,河南唐河473400 [4]中国石油大庆油田有限责任公司第十采油厂,黑龙江大庆163315

出　　处：《油气地质与采收率》2007年第3期94-96,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"重点基础研究项目"气/液/固复杂相变及渗流理论研究"(2001CB209108);国家自然科学基金重点项目"低渗透油层提高驱油效率的机理研究(50634020)"的部分研究成果

摘　　要：在室内实验得到的孔隙度变化率和渗透率变化率随有效压力变化规律的基础上,建立了考虑介质变形的低渗透气藏数值模拟模型,并采用IMPES方法进行了求解。研究结果表明,无论是否考虑介质变形,随着稳产期产能的增加,稳产期缩短,稳产期采出程度降低;但考虑介质变形与否对模拟结果有较大影响,当考虑介质变形时,井底流压下降较快,稳产期相对更短,稳产结束时的采出程度也更低。因此,对于变形介质气藏,气井的配产不能太大,否则将严重影响稳产期采出程度。Based on the lab study of variation of porosity changing rate and permeability changing rate with effective pressure,a numerical simulation model of deformable low permeability gas reservoir is established and is solved using IMPES method.The simulation result shows that both the duration of plateau production period and the gas recovery factor during this period decrease as the productivity in the period increases;but the deformation of the porous medium has great influence on the simulation results.The flowing bottomhole pressure decreases more quickly,the period of plateau production is shortened and the gas recovery factor obtained when the plateau production period ends is lower while media deformation is considered.The production proration of the gas wells should not be too large in deformable low permeability reservoir,otherwise the gas recovery factor obtained during the plateau production period would decrease greatly.

关 键 词：低渗透气藏 变形介质 数值模拟 有限差分 

分 类 号：TE311[石油与天然气工程—油气田开发工程]