一种求地层压力的新方法

A New Kind of Method for Calculating Formation Pressure

地层压力监测在气井生产中非常重要,然而取得准确的地层压力往往需要长时间的关井进行压力恢复,给油气田生产带来较大影响。因此,提出一种新的计算压力的方法,利用气井在拟稳态时气井拟压力降落曲线彼此平行的现象,得知地层拟压力下降值等于井底流动拟压力下降值,这样只需要关井一次,便能求出以后各生产阶段的地层压力值。通过与关井折算法、实测资料对比,此方法计算误差较小,具有显著的经济效益。

Formation pressure monitoring in production of gas well is very important,however,to obtain accurate formation pressure often takes long time of shut-in pressure recovery which brings bigger impact to production of oil and gas fields.This paper puts forward a new calculation method using the phenomena of the pseudo pressure drawdown curves for gas well being parallel each other in quasi steady state,to obtain that formation pseudo pressure drop value is equal to the flow of pressure drop.By shutting in the well once time,the formation pressure value of the later every production stage is obtained.Compared With the value from conversion method of closing well or the measured data,the calculation error is much small,and has significant economic benefits.