连续管注入头夹持块结构优化研究

Structural Optimization of CT Clamping Block on Injection Head

注入头是连续管装备中控制连续管上提和下注的主要装置,而夹持块是注入头与连续管直接接触的关键部件,结构合理的夹持块不仅能满足注入头作业质量要求,而且对连续管的伤害也较小。以夹持块和连续管的接触模型为研究对象,探索夹持块结构参数与连续管应力和变形之间的变化规律。研究结果表明,夹持块采用圆弧形结构可减轻对连续管的伤害,圆弧形夹持块的组合式设计可缩短其更换而造成的停工时间;当夹持块圆周包角在160°～175°、内径在88.75～88.90 mm范围内取值时,连续管的应力和变形情况均较好,夹持块的夹持能力也较强,能够收到较好的优化效果。

Injector head is the main device of coiled tubing （CT） equipment which controls CT upstrain and injection. Clamping block is the key part for direct contact between injector head and CT. The clamping block with a reasonable structure must do relatively less harm to CT. Taking as the object of study the contact model of clamping block and CT, this paper explores the variation law of structural parameters of the block and stress and deformation of CT. The research findings show that the circular-arc structure adopted by the block can reduce damage to CT. The combined design of the circular-arc block can shorten the replacement time. When the circumferential wrap angle of the block is between 160° and 175° and the inner diameter is between 88.75 mm and 88.90 mm, the stress and deformation of CT are desirable. The clamping capacity of the block is strong and the desirable optimization effect can be achieved.