利用井口油压计算地层静压新方法

储层压力的分布规律是气藏开发策略制定的重要依据。高含硫气井下放压力计到井底困难,测试数据少,对此常规方法无法准确求取地层压力。针对这一问题,提出一种利用井口压降求取气藏压力变化的新方法。首先论证了关井时井口油压与地层静压之间具有一致性,然后采用生产过程中关井时井口油压总结了各井的井口压降公式,根据测试点的地层静压得到单井区域地层静压随累产变化的公式,最后得到目前累计产量下各井的地层静压。

A New Method for Calculating Formation Pressure by Using Wellhead Pressure

The distribution rule of reservoir pressure is an important basis for formulation of gas reservoir development strategy. It is difficult to put pressure gauge into bottom hole of gas well with high sulfur content, and the test data are few, so the conventional method cannot get the formation pressure. According to this problem, a new method was put forward to calculate the pressure change of gas reservoir by using well head pressure. At first, it was proved that the wellhead pressure and formation pressure are consistent in the closed well, and then the wellhead pressure drop formula of each well was summarized. According to the static pressure of the test point, the formula of the static pressure of the formation of a single well was obtained, and the formation pressure of the well was finally obtained.