均质无限大储层灌注试井图版绘制方法及应用

A DRAWING METHOD AND APPLICATION OF THE IRRIGATION WELL TESTING CHART BOARD FOR HOMOGENEOUSLY INFINITE RESERVOIRS

本文依据灌注模型（Ⅱ）的理论结果［１］，应用ｓｔｅｈｆｅｓｔ算法３６８［２］，首次绘制出均质无限大储层灌注模型无因次压力ＰＤ及其导数Ｐ′ＤｔＤ／ＣＤ与ｔＤ／ＣＤ、无因次压力积分Ｐ（Ｄｉ）及压力积分差Ｐ（Ｄｉｄ）与ｔＤ／ＣＤ、无因次比Ｐ（ｏｉｒ１）、Ｐ（ｄｉｒ２）与ｔＤ／ＣＤ的双对数典型曲线。给出了利用新图版进行拟合的步骤，以及通过拟合求取地层参数的方法。现场４０多井次实测资料的解释结果表明，图版可靠，方法正确。

On the basis of theoretical results[1] of the irrigation model[Ⅱ]and by applying the Stehfest algorithm 368[2],this paper for the first time draws up log-log type-curves of dimensionless pressure PD and its derivative PD' tD/CD vs tD/CD,dimensionless pressure integration P(Di)and pressure integration difference P(Did)vs tD/CD, and dimensionless ratios P(Dir1),P(Dir1),P(Dir)2 vs tD/CD of the irrigation model for homogenously infinite reservoirs.The paper gives fitting procedures using the new chart board and methods of taking formation parameters by fitting.Interpretive results of more than 40 well-time measured data indicate that the chart board is reliable,and the method is correct.