火驱燃烧前缘位置研究

Research on the Position of Burning Front of Combustion Drive

在火驱过程中,对注入井进行压力降测试可以为计算燃烧前缘位置提供帮助。在对燃烧前缘位置进行计算分析时,必须考虑到温度对储层流体热力学性质的影响。通过对流动方程、连续性方程和状态方程进行联立求解可以获得燃烧前缘位置的数值解。该方法会将火驱燃烧前缘假定为圆形。但在现场应用时,如果发现燃烧前缘不是圆形的,那么根据该计算方法得到的数值解燃烧前缘的位置是燃烧前缘距离注气井最远点与最近点的平均值。如果地层存在定向渗透性,那么也可将燃烧前缘假定为椭圆形来对其燃烧前缘位置进行求解。

In the process of combustion drive,the pressure drop test on the injection well can help to calculate the combustion front position.In the calculation and analysis of the combustion front position,we also consider the influence of temperature on the thermodynamic properties of the reservoir fluid.The numerical solution of the combustion front position can be obtained by solving the flow equation,continuity equation and state equation.In general,this method assumes that the fire-fighting combustion front is circular.However,in the field application,if it is found that the burning front is not circular,then the numerical solution of the combustion front obtained from this calculation method is the average value of the combustion front from the farthest point and the nearest point of the gas injection well.If the formation has directional permeability,then the combustion front can also be assumed to be elliptical to solve the combustion front position.