低渗透致密储层气井试井模型研究  

WELL TEST MODEL STUDY OF THE GAS WELLS IN TIGHT RESERVOIR WITH LOW PERMEA BILITY

作　　者：冯曦[1] 钟孚勋[1] 罗涛[1] 

机构地区：[1]四川石油管理局地质勘探开发研究院

出　　处：《天然气工业》1998年第1期56-59,共4页Natural Gas Industry

摘　　要：通过对低渗透致密储层气井试井特殊问题的专题研究，形成了几点认识：①低渗透致密储层中气体渗流阻力主要是细小孔隙喉道处的水化膜造成的；②水化膜表面两侧压差大到一定程度时，气体才能冲破水化膜的阻力而流动；③气体流动过程中压力梯度小到一定程度时，水化膜又形成，流动停止。基于以上认识有针对性地建立了试井模型，用幂级数解法求出模型的解析解；就计算试井标准曲线问题作了算法研究。Through a monographic study on the special well test problems related to the gas wells in tight reservoir with low permeability,some knowledges have been obtained:(1)The resistance of gas flowing through tight and low permeability reservoir is caused mainly by the hydration film at the small pore's throat;(2)only the pressure differential at the two sides of hydration film surface is high to a certain degree,can the gas break the resistance of hydration film and flow;(3)when the pressure gradient of the gas during flowing is low to a certain degree,the hydration film forms again and flowing stops.Based on above mentioned knowledges,a well test model has been set up with aim and the analytical solution of the model is acquired by power series solution method.The algorithm study for calculating well test standard curve is done and the characteristic response and changing law of this special flow mechanism on well test curve are summed up.

关 键 词：低渗透油气藏 气井 试井 迭代法 

分 类 号：TE373[石油与天然气工程—油气田开发工程]