低渗气藏多层合采层间干扰系数的确定

对低渗气藏,为达到工业气流,常采用多层合采的方法。气藏多层合采层间干扰系数的计算,目前还没有合理的方法。根据气井多层合采物理模型,利用气井二项式产能公式及井筒压力计算模型建立了气井层间干扰系数的计算方法。实例计算了低渗气藏Y的16口气井的层间干扰系数,并进行了线性回归,得到气井层间干扰系数与层间跨度、测井KH差、生产压差的一个经验公式。利用该经验公式得到了低渗气藏Y的不同层的层间干扰系数,并采用面积加权平均,得到了Y气藏的干扰系数,得出Y气藏可多层合采的结论。该方法为低渗气藏开发方案的合理制定提供了重要依据。

Determination of interlayer interference coefficient for commingling production in low permeability gas reservoir

Commingling production is always used in the low permeability gas reservoir to yield an industrial gas. However, there was no reasonable method to calculate the interlayer interference coefficient for commingling production. Basing on a physical model, this paper adopts methods of gas well binomial deliverability equation and well bore pressure calculation to get the interference coefficients of 16 gas wells; a linear regressed formula involving interlayer width, KH difference from well logging and pressure drop can be obtained. The interlayer interference coefficient of the different layers of the Y gas reservoir can be acquired with this formula, and the interference coefficient of the Y gas reservoir can also be obtained with the area weighted average method. As a result, a conclusion can be drawn that the Y gas reservoir can adopt commingling production. This method provides a significant basis to establish a development project of the low permeability gas reservoir.