长水平段超深井连续管钻塞作业受力分析

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中图分类号：TE358文献标识码：A DOI：10.12473/CPM.202407004

Abstract： For purpose of accurate landing depth prediction and process safety assessment of coiled tubing （CT）plug driling operation，considering thefactors such as wellbore trajectory，buoyant weightofCT，frictionof pipe sleeve，CTbuckling and boundary conditions of botomhole assembly（BHA），based on the soft rope model， amechanical modelof CToperations was constructed by incorporating variable friction factor and CTwith variable wall thickness，and taking into account the influence of wellfluiddrag force.Moreover，the estimatesof diferent models were compared using theactual data from an ultra-deep wellS9P1H.The results show that the wellfluid drag force leads to enhanced load on CT，while the variable friction factor isconducive to the decreased load on CT，and the variable wall thicknesshelps reduce the stress on CTand relieve the fatigue ofCT，prolonging its service life. The use of CT of 60.3mm in diameter enables drilling to the bottomhole even at the weight on bit（WOB） of 20kN and 25kN ，suggesting that the mechanical model incorporating variable friction factor and variable stiffness maximizes the plug driling capability within the safe range.The research results provide guidancefor addressing insufficient extension of CT in plug drilling operation in ultra-deep wells.

Keywords： plug drilling operation；ultra-deep well；mechanical model;； CT with variable wall thickness; landing depth;drag force

0 引言

连续管作业以高效率、强大的带压作业能力和作业过程中的持续流体循环能力，在非常规油气井的开发中扮演着重要角色[1-5]。（剩余11900字）