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深水低压井口下入工具是低压井口管柱的唯一平台转移和钻台下入工具,影响着深水导管的安全高效下入作业。为打破国外技术服务公司的长期技术垄断,通过对深水低压井口下入工具的结构设计、工作原理、工作过程及深水钻井平台操作工况、作业程序、作业关键技术难题的研究,设计了一种采用圆头T型卡簧推杆、锥面轴套及卡簧相配合的新型深水低压井口下入工具的锁紧与释放结构;应用该锁紧与释放设计结构并配合安装导向头设计结构,可使下入工具适应于深水恶劣操作工况条件;通过对不同作业工况条件下的承载力学特性分析和操作过程仿真分析,研究了结构系统安全性及工具锁紧与释放过程的可行性;数值模拟分析表明,起吊、下入最危险操作工况条件下,许用应力安全系数分别为3.87、4.98。本研究可为安全、高效地开展深水低压井口头平台转运及下入作业提供一种新的设计思路和方法。
Deepwater low pressure wellhead entry tool is the only platform for low pressure wellhead string transfer and drill down into the tool, affecting the safe and efficient operation of deep water conduit. In order to break the long-term technical monopoly of foreign technology service companies, this paper designs a structural design, working principle, work process and operating conditions of Deepwater Drilling Platform, working procedures and key technical problems of deep well under low pressure wellhead. The utility model adopts a locking and releasing structure of a new type of deep-water low-pressure wellhead which is matched with a round T-shaped clamping spring push rod, a conical surface bush and a clamping spring; the locking and releasing structure is designed and matched with a guide head design structure, Under the condition of different working conditions, the bearing mechanics characteristics analysis and operation process simulation analysis, the structural system safety and tool locking and release process feasibility; Numerical simulation shows that under the conditions of lifting and entering the most dangerous operating conditions, the allowable stress safety factors are 3.87 and 4.98, respectively. This study can provide a new design method and method for the safe and efficient transport and operation of the deep well and low pressure wellhead platform.