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齐成伟带纵公式不适用于带状高含硫气藏,根据气相渗流与液相渗流的相似原理和Roberts气体相对渗透率与含硫饱和度的关系,将齐成伟带纵公式的适用条件推广为高含硫气藏,推导出了带状高含硫气藏中纵向双分支水平井的拟三维产能预测公式,即齐成伟带纵公式的高含硫气藏推广公式。根据齐成伟带纵公式的高含硫气藏推广公式,分析了硫沉积量、渗透率各向异性系数、带状气藏长度、生产段井筒位置和生产段长度对产能的影响。分析结果表明:产能随着含硫饱和度或渗透率各向异性系数的增大而减小;相同井境下,含硫饱和度对产能的影响要明显大于渗透率各向异性系数;产能随着带状气藏长度的增大而减小;产能随着生产段井筒位置的增大先增大,后减小,且当生产段井筒处于气藏中央高度时,产能最大;产能随着生产段长度的增大而增大。
According to the similar principle of gas seepage and liquid seepage and the relationship between relative permeability and sulfur saturation of Roberts gas, the applicable conditions of Qi Cheng Wei’s longitudinal formula are generalized as high Containing gas reservoirs, the quasi-three-dimensional productivity prediction formula of horizontal bifurcated horizontal wells in strip-shaped high-sulfur gas reservoirs is deduced, that is, the promotion formula of high-sulfur gas reservoirs with the vertical formula of Qi Chengwei. According to the extension formula of high-sulfur gas reservoirs with vertical and horizontal integration of Qi Chengwei, the influence of sulfur deposition, permeability anisotropy coefficient, length of belt-shaped gas reservoirs, production wellbore position and production section length on productivity were analyzed. The results show that the productivity decreases with the increase of sulfur saturation or permeability anisotropy coefficient. Under the same well condition, the influence of sulfur saturation on productivity is obviously greater than that of permeability anisotropy coefficient. With the length of belt-shaped gas reservoirs increasing and decreasing; capacity increases first and then decreases with the increase of wellbore position in production section, and reaches the maximum when production wellbore is at the central height of gas reservoir; Section length increases and increases.