用于气藏不稳定试井分析的新图版曲线

A New Chart for Analysing Transient Testing of Gas Reservoir

由于气体的压缩性较大,使得气井关井压力恢复时续流效应十分严重,导致现有的分析图版难以拟合早期段数据。为此,本文提出运用井底岩面产量的变化来描述关井后的续流现象,在此基础上研制出了适合于气井不稳定试井早期数据分析的新图版曲线,通过应用表明,该图版曲线能准确、快速、可靠地求出有关的气藏参数,为气井不稳定试并分析提供了一个新的图版。

Because of the gas compressibility, the afterflow effect is serious during buildup the shut-in pressure of gas well, so that it is difficult to fit the early stage data using the present analysing chart. Therefore, a new chart for analysing the early stage data of transient testing has been developed based on describing the after- flow phenomenon after shut-in by use of the production change of rock surface in the well bottom in this paper. Through the application of the chart, it is demonstrated that the related parameters of gas reservoir can be determined quickly and correctly.