【摘要】 气井出水是长期以来困扰涩北气田提高开发效果的主要问题之一。首先从宏观气水分布及气水运动规律的角度出发,分析了边水、层内水、层间水的形成机理和气井见水的3种基本模式;然后从微观角度,对疏松砂岩气藏的储层孔隙结构及岩石润湿性进行了研究,分析其对气藏原始气水分布的控制作用。结果表明,涩北气田储层纵向上砂、泥岩间互分布,对于孔隙结构较差、以细小孔隙为主、孔隙与喉道半径较小且分选性较差的储层,将导致气水分异作用减弱,从而形成较长的气水过渡带。对于涩北气田,构造位置是控制原始气水分布的决定性因素,毛细管压力是造成气水界面分布特征的关键因素,储层岩石的混合润湿性也是影响因素之一。更多还原

【Abstract】 Water breakthrough in gas wells has been one of those problems influencing the development effect in the Sebei gas field.First,from the macro view of gas-water distribution and movement law,the formation mechanisms of edge water,inlayer water and interlayer water,as well as the three basic models of water breakthrough in gas wells were analyzed.Then from the microscopic angle,this paper studied the reservoir pore structure and rock wettability of loose sandstone gas reservoir,and analyzed their control effect on gas reservoir’s original gas-water distribution.The results showed that sandstone and mudstone distribute by turns vertically in the reservoir of Sebei gas field.Moreover,reservoirs,with bad pore structure,small pore & throat radius and poor sorting features,will decrease gas-water differentiation,resulting in longer gas-water transition zone.In the Sebei gas field,structural location,capillary pressure and mixed wettability of reservoir rocks are the main influencing factors on the gas-water distribution,with structural location being the decisive factor on the original gas-water distribution,and capillary pressure being the key factor on the distribution characteristics of gas-water interface.更多还原