水平井产能替代比模型研究与应用

Study and application of a new horizontal well productivity substitution ratio model

在考虑水平井与定向井单井泄油面积差异对水平井产能影响的基础上,建立了新的替代比模型,通过迭代运算,评价了不同地质条件下的油层厚度、储集层非均质性及不同水平段长度的产能指标,计算出水平井产能与定向井产能的倍比关系,定量分析了上述3个主要因素对水平井产能的影响程度。利用该替代比模型可提高水平井产能研究精准度,由于油层厚度、储集层非均质性对水平井产能影响较大,非均质性小的薄储集层实施水平井优势明显。目前该方法已在A油田得到应用,实施的水平井实际产能与评价计算结果较接近,表明该方法可为水平井的优化部署决策提供量化指标,具有一定借鉴作用。

On the basis of considering the influence of the difference of single well drainage area between horizontal well and directional well on the productivity of horizontal well,a new substitution ratio model was set up.Through iterative computation,core intersection,reservoir heterogeneity and productivity index of different horizontal section were evaluated under different geological conditions.The ratio relationship between horizontal well productivity and directional well productivity was calculated.The influence of above 3 main factors on horizontal well productivity was quantitatively analyzed.Using this substitution ratio model can improve the accuracy of horizontal well productivity research.Due to the influence of reservoir thickness and reservoir heterogeneity on horizontal well productivity,the horizontal wells have obvious advantages in thin reservoirs with small heterogeneity.At present,the method has been applied in A oilfield,and the actual productivity of horizontal wells is close to the evaluation calculation.This method can provide quantitative indexes for the optimal deployment decision of horizontal wells,and has a certain reference effect.