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为了减小视表皮系数从而提高气井产能,水力压裂在高渗透性气藏中的应用日益广泛。压裂后剩余裂缝率取决于表皮系数的变化。目前仍不清楚表皮系数的变化是裂缝中非达西流的结果、还是地层的影响,或两者的作用。 本文研究了压裂气井中的地层和紊流效应,通过数值模拟研究发现所需的裂缝半长可以消除地层紊流的影响。对地层和裂缝中均存在非达西流的类似研究得到了裂缝长度的一个关系式,它需要得到绝对无阻流量AOF的75％时零视表皮系数,该系数是地层渗透率、压力、裂缝导流能力及紊流系数β的函数。
In order to reduce the apparent skin coefficient and improve the productivity of gas wells, hydraulic fracturing has been widely used in high permeability gas reservoirs. The residual fracture rate after fracturing depends on the change of epidermal coefficient. It is not yet clear whether the change in the skin factor is the result of non-Darcy flow in the fracture, or the effect of the formation, or both. In this paper, the formation and turbulence effects in fractured gas wells are studied. The numerical simulation shows that the required half-crack length can eliminate the influence of formation turbulence. A similar study of non-Darcy flow in both strata and fissures gave a relation for the length of the fracture, which required a zero skin factor of 75% of the absolute unobstructed flow AOF, which is the ratio of formation permeability, pressure, Flow capacity and turbulence coefficient β function.