【摘 要】
：
The flowing mechanism of a low permeability gas reservoir is different from a conventional gas reservoir, espe-cially for that with higher irreducible water sat
【机 构】
：
MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Research Institute of P
论文部分内容阅读
The flowing mechanism of a low permeability gas reservoir is different from a conventional gas reservoir, espe-cially for that with higher irreducible water saturation the threshold pressure gradient exists. At present, in all the deliverability equation, the additional pressure drop caused by the threshold pressure gradient is viewed as constant, but this method has big error in the practical application. Based on the non-Darcy steady flow equation, the limited integral of the additional pressure drop is solved in this paper and it is realized that the additional pressure drop is not a constant but has something to do with production data, and a new deliverability equation is derived, with the relevant processing method for modified isochronal test data. The new deliverability equation turns out to be practical through onsite applica-tion.
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