利用无因次压力导数样板曲线快速识别和分析油藏外边界

针对目前试井解释中用压力导数曲线识别和分析油藏外边界时存在的不足,提出利用无因次压力导数曲线识别和分析油藏外边界的新方法。无因次压力导数样板曲线能够清楚地反映各种油藏外边界形态,曲线特征明显,易于辨认。应用表明,利用无因次压力导数样板曲线能够快速准确地识别和分析油藏外边界,再结合自动拟合技术快速拟合压力,最终可得到完整的试井解释结果。对于外边界模式比较复杂的油藏,正确运用该方法可提高试井解释的可靠性。

Rapid identification and analysis of outer reservoir boundary using template curves of dimensionless pressure derivative

A new method to identify and analyze the outer boundary of a reservoir is developed by using template curves of dimensionless pressure derivative,because of the shortcomings of pressure derivative in this aspect. The template curves of dimensionless pressure derivative can clearly indicate outer boundaries of various reservoirs,with their patterns distinctive and recognizable.The method's applications show that the template curves of dimensionless pressure derivative can be used to identify and analyze the outer boundary of a reservoir rapidly and accurately.If the results can be combined with matched pressure from the automatic match technique,a complete interpretation of well testing will be obtained.For reservoirs with complex boundaries,the reliability of well test interpretation can be improved by a correct application of the method.