一种新型送入工具的研制与应用

Design and Application of New Running Tool

针对油气田井下作业过程中脱手失败后无法提供备用方案,以及送入工具种类繁多、适应性不强等问题,研制了一种新型送入工具总成。建立了弹性爪结构和接触应力计算模型,利用有限元分析建立了弹性爪轴对称有限元模型,评估了弹性爪插入、上提及解锁时3种应力状态,同时对CEM镁铝合金溶解速率进行了分析。研究结果表明:该送入工具解决了管柱下入过程中不能旋转的问题,适用于尾管送入、储层保护阀回接、水平井压裂管柱送入及堵塞器投放等多种作业;工作筒采用CEM镁铝合金材料,可在设定时间自动溶解;该送入工具总成在管柱遇阻时可提供扭矩,具备液压、机械及自溶3种脱手方式。研究结果可以为送入工具的设计提供技术指导。

In response to the failure of machinery or hydraulic release during downhole operation in oil and gas fields,no stand-by solutions are available and various running tools are lack of applicability.To address these problems,a new running tool assembly was developed.A structure of elastic claw was presented and the contact stress calculation model was established.By means of finite element analysis,an axisymmetric finite element model of the elastic claw was established and three stress states were evaluated when the elastic claw is inserted,lifted and unlocked.Meanwhile,the dissolution rate of CEM magnesium aluminum alloy was analyzed.The results show that,this running tool could solve the problem that the pipe string cannot be rotated during running in the hole,so it is applicable for many operations such as liner run-in-hole,reservoir protection valve retrieval,fracturing pipe string running in horizontal wells and plugging devices placement.The working cylinder made of CEM magnesium aluminum alloy could be dissolved automatically at a set time.This running tool could provide torque in case of pipe stuck and possess three release ways including hydraulic,mechanical and automatic dissolution.This study could provide a technical guidance for the design of running tools.