校正地层损害时绝对无阻流量的计算方法

Calculation Method of Absolute Open Flow Capacity during Formation Damage Correction

不应把直接从二项式产能方程或指数式产能方程或经验产能方程得到的绝对无阻流量q作为评价气井产能的参数，应采用消除地层损害后的绝对无阻流量q′AOF作为评价气井产能的参数；校正后的绝对无阻流量与地层损害表皮系数、地层压力、厚度、渗透率、气体粘度、体积系数等有关。对于校正后的绝对无阻流量的计算，在利用压力法和压力平方法时有所不同。

Gas well productivity should be evaluated by using the absolute open flow capacity q＇AOF which is obtained after eliminating the formation damage rather than the absolute open flow capacity qAOF which is acquired directly from the binomial exponential or empirical deliverability equations． The corrected absolute open flow capacity is correlated with skin factors formation pressure thickness permeability gas viscosity and volume factor． Calculation of corrected AOF is slightly different by using the pressure method and pressure square method．