带状高含硫气藏分支水平井拟三维产能预测研究

RESEARCH ON PSEUDO-THREE-DIMENSIONAL PRODUCTIVITY PREDICTOR FORMULA OF BRANCH HORIZONTAL WELL FOR SOUR GAS RESERVOIR

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关系,著名的齐成伟公式被成功改造为带状高含硫气藏中分支水平井的拟三维产能预测公式。根据齐成伟公式的高含硫气藏修正公式,分析硫沉积量和渗透率各向异性系数对产能的影响规律后,取得了硫沉积量对产能的影响大于渗透率各向异性系数、相同井和生产段长的情况下,纵向井产能大于横向井,且两者差值随着含硫饱和度的增大或渗透率各向异性系数的增大而减小;在带状高含硫气藏中宜打纵向双分支水平井的重要认识。

According to the similarity principle between gas seepage and liquid seepage,and the relationship,summed up by Roberts,between gas relative permeability and sulfur saturation,the famous QI-Chengwei's formulae were successfully generalized to pseudo three-dimensional productivity formulae of horizontal wells in ribbon-shaped sour gas reservoir.On the basis of the revised formulae,the impact of sulfur deposition amount and permeability anisotropy coefficient on productivity was analyzed,and an important knowledge was obtained that the effect of sulfur deposition amount on productivity was greater than that of permeability anisotropy coefficient,and longitudinal horizontal well has more advantages than transverse horizontal well in ribbon-shaped sour gas reservoir.