水平井中心油管完井技术研究

The Method Study on Horizontal Wells with Stinger Completions

流体沿水平井筒产生的不均匀性压降,导致趾端的采收率降低,增加了跟端底水锥进的速度。提出一种将中心油管从水平井跟端延伸至水平井段的一种完井方式。该方式将水平井段分为两段,从而极大地降低了流体沿水平井筒的压降。根据线汇叠加、镜像反映等原理推导得到中心管耦合模型,利用模型计算中心油管置入的最佳位置,延缓了底水锥进,延长了无水采油期。

Pressure drop along horizontal wells causes unequal drawdown along the well, which can rectuce the effectiveness of the toe of the well and increase the tendency for water and gas coning at the heel. Completions have been proposed to combat this effect by using a stinger that extends from the heel into the horizontal section. This reduces the magnitude of the pressure drop over the wellbore, because the well is effectively split into two segments of reduced length. Stinger coupling model can be achieved by liner superimpose and reflection mirror principle and mass conversation and momentum principle. So the difference of influx profile before and after stinger construction can be measured.