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低渗透气藏存在较强的应力敏感性,对大量岩石实验数据回归研究表明,幂函数渗透率应力敏感性经验方程相关性相对较好,但是利用该关系式来研究低渗透气藏气井产能的报道还较少。利用幂函数渗透率应力敏感性经验公式,综合考虑渗透率应力敏感效应、启动压力梯度、紊流效应和表皮系数,建立了一个新的适用于低渗透异常高压气井的三项式产能方程。不同参数组合情况下的气井流入动态曲线对比研究结果表明,应力敏感性、启动压力梯度和紊流效应对低渗透气藏气井产能的影响较大,在产能评价研究时必须予以考虑。
The low permeability gas reservoirs have strong stress sensitivity. The regression analysis of a large number of rock experimental data shows that the empirical correlation of stress sensitivity empirical equation of power function permeability is relatively good, but this formula is used to study the productivity of gas wells in low permeability gas reservoirs Reported less. Based on experiential formula of stress sensitivity of power function permeability, a new tri-equation productivity equation suitable for low-pressure abnormally high pressure gas well is established by comprehensively considering permeability stress sensitivity effect, starting pressure gradient, turbulence effect and skin factor. Comparisons of dynamic inflow curves of gas wells under different combinations of parameters show that stress sensitivity, starting pressure gradient and turbulence effect greatly affect the productivity of gas wells in low permeability gas reservoirs and must be considered when evaluating productivity.