低渗透油藏注气吸气能力评价方法

低渗透油藏的注水往往存在很大困难，为提高此类油藏的动用程度，选择卫42－14井组实施了氮气驱先导试验，在评价低渗透油藏吸气能力的过程中，有必要建立描述地层吸气能力的数学模型－吸气方程。根据渗流力学理论，注入与产出的区别仅在于流体渗流方向的不同，因此针对不同的注气时期，分别讨论了“达西公式”和“气井产能方程”两种形式的数学模型，并对后者采用压降资料进行求解的方法做了详细介绍，为今后此类注气的研究奠定了基础。

Evaluation Method of Gas-injectivity in Low Permeability Reservoirs

Water injection is always difficult in low permeability reservoirs, to improve the working degree of this reservoir, Wei42 14 well group was selected to conduct the nitrogen gas flooding pilot test. A mathematical model (gas infected equation) was built to describe the gas injectivity of the layer. According to the different gas injection period the two mathematical models of Darcy Equation and Gas Well Production Equation were discussed respectively, a method of solving the later model with the pressure decreasing data was introduced in detailed, providing foundation for this kind gas injection study later.