基于约束优化的高温高压气井产能评价方法

Productivity Estimation of High-Temperature and High-Pressure Gas Well by Constrained Optimization

高温高压气井利用测试资料求取产能时,普遍存在产能曲线反向以及无阻流量求取数值偏大等问题。在高温高压气井三项式产能方程合理性分析的基础上,形成基于约束优化算法的高温高压气井产能测试资料解释方法,并进行了实例应用,确定新疆某深层高温高压气井无阻流量为203.0~4×104m^3/d。研究结果表明:基于约束优化方法的二项式产能方程和无阻流量与前人方法结果接近,而基于约束优化的三项式产能方程和无阻流量则更符合现场实际。

The reverse productivity curve and AOF( absolute open flow) will be overestimated when test data are used to estimate the productivity of high-temperature and high-pressure gas well. Based on the analysis of trinomial productivity equation,a new interpretation method of high-temperature and high-pressure gas well productivity test data is developed by constrained optimization. This method is applied to estimate the productivity of a high-temperature and high-pressure gas well in Xinjiang Oilfield and the corresponding gas well AOF is 203. 04×10~4m^3/ d. Research shows that the estimation of productivity and AOF by using binominal productivity equation with constrained optimization approximates to that of previous methods.However,the estimation of productivity and AOF by using trinomial productivity equation with constrained optimization shows much more consistency with field actual values.