摘要
地下多孔介质因具有较大的比面积而对凝析油气流体具有较强的吸附能力 ,多孔介质对凝析油气藏中流体的渗流具有不可忽略的影响 ,文章根据天然裂缝性凝析气藏渗流特点 ,首次将多孔介质吸附影响项直接纳入渗流微分方程中 ,并建立了考虑多孔介质吸附影响的天然裂缝凝析气藏试井分析模型。利用拉普拉氏变换得出了模型的解 ,绘制了试井分析理论曲线 ,分析了理论曲线的特征 ,给出了试井分析步骤 ,并进行了实例分析。结果表明 :多孔介质吸附对试井解释结果具有较大影响 ,考虑多孔介质吸附影响下的试井分析所得地层有效渗透率低于不考虑吸附影响时的情况 ,但视表皮因子则相反 ;考虑多孔介质吸附影响时的窜流系数低于不考虑吸附影响时的结果 ,弹性储容比则相反。
Underground porous media being of larger specific surface have stronger adsorbability to condensate oil and gas fl uids,which exerts an influence not to be ignored on the percolation of fluids in condensate reservoir.In the paper,according to the properties of the percolatio n flow in fractured condensate gas reservoir,the influence term of porous media adsorption is directly brought into the percolation differential equation firstl y;a well testing analysis model of fractured condensate gas reservoir in conside ration of the influence of porous media adsorption is set up;the solutions of th e model are obtained by use of Laplace transform;the theoretical curves of well testing analysis are drawn;the characteristics of these curves are analyzed;the well testing analysis procedure is given out;and an example analysis is carried out.The analysis results indicates that the influence of porous media adsorption on well testing interpretation achievement is obvious,i.e.the effective permeab ility derived from well testing analysis as considering the influence of porous media adsorption is less than that as unconsidering the influence,but the conclu sion of pseudo skin factor is contrary to that of the effective permeability;t he interporosity flow coefficient as considering the influence is lower than th at as uncon sidering the influence,but the conclusion of elastic reservoir volu me ratio is contrary to that of the interporosity flow coefficient.Therefore it is necessary to consider the influence of the porous media adsorption,when an ac tual well testing analysis is carried out.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2002年第5期71-74,共4页
Natural Gas Industry
基金
由"油气藏地质及开发工程国家重点实验室开放基金项目"(PLN0 1 2 6)资助
