评价气井产能的拟压力"一点法"OA

In order to evaluate the deliverability of a new gas well rapidly and accurately,solve the problems of time-consuming and costly multi-point testing,and improve the computational accuracy of the conventional pressure-squared"one point method"for gas well deliverability evaluation,a pseudopressure"one point method"was derived from the binomial deliverability equation based on gas well pseudopressure.The following results are obtained.(i)The introduction of dimensionless pseudopressure and dimensionless production simplifies the pseudopressure binomial deliverability equation into quadratic equation in one unknown,and derives a formula for calculating absolute open flow potential(AOFP).(ii)The flow regime factor(α)suitable for newly commissioned vertical gas wells is determined to be 0.25,and the derived pseudopressure"one point method"deliverability evaluation equation is robust in theoretical accuracy and calculation convenience.(iii)Field application shows that the AOFP values at different testing points of Well Wei-2 calculated using this method are basically consistent,indicating good stability of prediction results.(iv)Compared with the data measured through multi-point testing,the inflow performance relationship(IPR)curve generated from the prediction by the pseudopressure"one point method"is more consistent with the measurement results,verifying the reliability of this method in predicting gas well deliverability under different bottomhole flowing pressures(BHFPs).The proposed method not only inherits the merits of simplicity and rapidity from the conventional"one point method",but also theoretically accords with the gas seepage laws.Therefore,it is a practical and efficient method for evaluating gas well deliverability and predicting IRP curves.