地层压敏对低渗透气井产能影响研究

对低渗透地层的压力敏感性进行了室内实验,获得了大量数据,在对实验数据分析、归纳和总结的过程中,发现渗透率和地层压力在半对数图上并非象经典理论所描述的表现为直线,而为分段变化特征,从而提出了压敏分段变化的观点.对渗透率与压力变化进行了分段回归,建立了渗透率分段变化压敏数学模型和渗透率指数变异拟稳态产能预测模型.并在此研究的基础上,对塔里木盆地某气藏的压敏特性进行了分析并给出了其单井产能预测方法,该研究对低渗透压敏气田的高效开发具有重要的指导意义.

The Study of Influencing Factor for the Gas Well Productivity in Low Permeability Formation for Stress-Sensitivity

The laboratorial experiment has been done and gotten much data of stress-sensitivity in low permeability formation. By analyzing and summing up to find, the data points plot on semi-log plot does not show a single linear but two or multiple stage linear curves. The theory of multiple stage variety for stress-sensitivity has been put forward. These phenomena can be well characterized by two or multiple stages exponent formulation, then stress-sensitivity mathematical models of permeability variation at different stage and pseudo-steady gas well productivity forecast mathematical models by permeability exponent variation have been made. The stress-sensitivity characteristic has been analyzed in gas fields in Tarim Basin and its methods of gas well productivity forecast have been given. Thetheory and methods have important instructional significance for highly efficiently exploitation of the low permeability stress-sensitivity formation.