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In the construction of large diameter rescue wells, a lot of tripping operations are needed for drill pipes, drill collars and other drilling tools. Aim at that frequent screwing and unscrew of the top drive active drill pipe and the drill string in the tripping operation of the traditional drilling machine, the operation efficiency is low, the labor intensity is high, and the buckle is easy to be damaged. The rapid connection method of drill pipe suitable for conventional drilling tools is studied, and the hydraulic lifting device for rapid drilling under the flag is designed. The maximum lifting force reaches 1350kN, during the tripping operation, the hydraulic lifting device directly grabs the drill rod to realize the rapid connection between the power head and the drill rod; at the same time, it combines with the electro-hydraulic remote control system to complete the remote control of the drill pipe tripping operation. Finally, a set of tiltable hydraulic lifting device suitable for rapid tripping of large diameter rescue wells is formed. Through structural mechanics analysis, performance test and field industrial application, the average tripping efficiency of the hydraulic lifting device is up to 3 minutes/piece. And that trip efficiency is improved. And equipment support is provide for rapid construction of that rescue well.
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