对流线分布和压力响应特征曲线的综合分析表明，部分射开井的压力导数曲线出现两条水平直线段。
Pressure response characteristics for partially perforated wells were obtained by analyzing synthetically the streamline distribution and the pressure response characteristic curves.
对于存在定压边界煤层气藏，压力双对数曲线的晚期是水平直线段，压力导数双对数曲线的晚期都是急剧下掉的曲线。
As for the coal-bed gas reservoirs with constant pressure boundary, the log-log pressure curves are horizontal lines and the log-log pressure derivative curves are falling rapidly in the late stage.
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