高产气井井口压力动态Laplace空间解

LAPLACE SPACE SOLUTIONS FOR WELLHEAD PRESSURE BEHAVIOR OF HIGH-RATE GAS PRODUCERS

针对高产气井在井口测试时出现的压力动态异常试井数据,无法采用目前的试井解释方法进行有效的分析,早期研究的成果认为这类压力动态异常主要是温度变化引起的,并给出了相应的非稳定传热特性的井筒压力、温度预测的数学模型,但当时采用的是数值分析的求解方法。通过认真研究和深入分析,获得了其相应的Laplace空间解,从而解决了由温度引起的压力异常问题,这进一步完善了试井分析理论方法。此研究为异常高压气井的动态监测提供了理论基础,对相应的软件的研制具有指导意义。

For wellhead test of high-rate gas producers, there are abnormal well test data of pressure behavior, which cannot be effectively analyzed by current methods. At previous studies, it was thought that such data came from temperature variations, and corresponding mathematical model has been set up for wellbore pressure and temperature prediction. In this paper, Laplace space solutions of such model, which was solved by numerical analysis before, were acquired, so that the abnormal pressures were avoided. This study set up theoretical foundation for performance monitoring of ultra-high pressure gas wells and provided guidance for relevant software development.