复杂结构水平井产能关系研究

Research on deliverability relationship of complicated horizontal well

通过分析多底井油藏内的渗流特征,建立了复杂结构井的概念,并对影响复杂结构井的产能因素进行了正交数值实验研究。结果表明,分支水平井的分支长度和分支井数是影响产能的主要因素,二者的影响程度相当,增加分支长度或分支井数均可以增大泄油范围,进一步增加油井产能。有限导流条件下复杂结构水平井的产能关系呈非线性特征,不同分支井条件下的产能增比与分支井数和分支长度组合数呈指数变化特征。复杂结构井的产能关系式能够涵盖常规水平井,具有水平井产能关系的一般性特征。

A new concept of complicated horizontal wells was defined based on the fluid flowing characteristics in reservoir with muhi-lateral wells. And influnence factors for deliverability of complicated horizontal wells were studied by orthogonal numerical simulations. The results show that the major factors of affecting the well deliverability are lateral branch length and branch number. The oil drainage area can be improved when the branch length or branch number is increased,and the well deliverability will be increased. The deliverability relationship of oil wells with definite conductivity along horizontal wells was investigated through changing branch number, and the deliverability of complicated horizonal wells presents nonlinear characters. The specific productivity ratio shows an power law relation with the group number of lateral branch length and branch number, the relationship is universal and it can overlap the conventional horizontal wells.