【摘要】 文章依据气藏水平井湍流仅发生在井附近短半轴小于10倍井半径的旋转椭球体内,而此椭球体外的流动是达西流动,可以使用水平井达西流的各种地层边界条件下的产能公式的特点,研究了高速气体向水平井流动的非达西流二项式产能公式。水平井二项式产能公式是基于气藏被分为达西流动区域和非达西流动区域二部分的公式组合,借助对水平井系列研究成果及非达西流压力梯度的二项式公式,导出了气藏水平井新型产能公式。这些新公式充分考虑了水平气井的特点,较之其它文献,如据Joshi公式导出的气藏水平产能公式,更能准确地反映水平井的渗流规律。更多还原

【Abstract】 According to the characteristics i.e. the turbulence of horizontal gas wells happens only in the rotary ellipsoid with the short semi axis less than 10 radius of the well bore and the flow outside the ellipsoid fits the Darcy’s law, so that the deliverability formula can be used under the various formation boundary conditions for Darcy flow of horizontal wells, the non-Darcy binomial deliverability formula is studied for speed gas to flow into the horizontal wells. Since the gas reservoir is divided into 2 parts of Darcy flow and non Darcy flow, the binomial deliverability formula of horizontal wells is the combination of the 2 parts’ formulas. With the study results for horizontal wells and the binomial pressure gradient formula of non Darcy flow, a new deliverability formula of horizontal gas wells is derived. Comparing the other formulas, such as the deliverability formula of horizontal gas wells derived by Joshi’ formula, the new formula taking the characteristics of horizontal gas wells into full consideration can describe the percolation law of horizontal gas wells more accurately.更多还原