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Study on multi-segment friction factors inversion in extended-reach well based on an enhanced PSO model

机译:基于改进PSO模型的大位移井多段摩擦系数反演研究

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摘要

Friction factor is an important parameter in the downhole drag & torque calculations and usually determined by inversion method. In traditional inversion calculation of friction factors, wellbore is divided into two sections, including cased hole and open hole, so that only two friction factors are introduced to characterize the drags in cased hole and open hole respectively. However, this traditional method is often not applicable for extended-reach well (ERW) in which the drag is usually too complicated to be characterized by only two friction factors. Therefore, more friction factors are needed to characterize drag in ERW more accurately.
机译:摩擦系数是井下阻力和扭矩计算中的重要参数,通常通过反演方法确定。在传统的摩擦系数反演中,井筒分为套管井和裸眼两部分,因此仅引入两个摩擦系数来分别描述套管井和裸眼的阻力。但是,这种传统方法通常不适用于延伸井(ERW),在该井中阻力通常过于复杂而无法仅通过两个摩擦系数来表征。因此,需要更多的摩擦系数来更准确地表征ERW中的阻力。

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