深层气井试气过程中关井油压变化动态预测方法

Dynamic Monitor Method on Oil Pressure Change of Oosed Well for Gas Testing in Deep Gas Well.

以往对关井恢复中油压的变化趋势预测和分析的方法,不能准确预测油压稳定时间以及稳定油压。新的油压分析方法以不稳定试井理论为基础,用Excel将油压及时间数据绘成半对数曲线,根据直线斜率确定油压与恢复时间的关系式,不仅可以预测油压稳定时间,而且还可以计算出稳定时油压值,进一步估算出地层恢复压力。通过现场实例分析,证明该方法科学可靠,预测结果准确,使用简单方便,易于推广应用。

The former method of forecasting and analysis for change of oil pressure at time of build up in closed well can not foresee stable time and oil pressure accurately. Based on unstable testing theory, the new way, using Excell to plot half logarithm curve of oil pressure and time data and determining relationship between oil pressure and built up time by beeline slope, can not only dope out stable time of oil pressure, but also calculate oil pressure value at stable condition to estimate formation build up pressure, by analysis for field examples, it is proved that this way is scientific and reliable whose forecasting result is nicety and easy to popularize and apply for its simple operation and convenience which provides an effective way for dynamic monitoring work in gas well.