智能钻柱关键密封技术研究

为解决目前电动钻井智能钻柱电传输安全技术问题,针对智能钻柱上卸扣自动密封与核心件高压泄漏等问题,根据使用环境与工艺要求,选取出一种适用于智能钻柱的核心件旋转动/静密封结构,通过对初始压缩率、介质压力、插针和插座旋转壳体旋转速度等影响密封性能的主要因素进行有限元分析,进一步完善、提高了密封结构旋转密封性能。最后,通过试验测试验证了其合理性与使用效果。结果表明:初始压缩率为17%时密封圈的密封性能较好,因双三角滑环起到挡圈作用致使该密封结构能够耐住10 MPa高压,插针旋转壳体或插座旋转壳体旋转速度在2 rad/s以下密封性能最好。选用带三角滑环的O型圈组合密封并优选该密封结构相关参数,有效地解决了智能钻柱关键密封问题,从而确保电动钻具的电信号和动力能够高效快速的传输,进一步推动了智能钻柱的发展。

Research on key sealing technique for intelligent drill string

In order to solve the problem of electric transmission safety technique through intelligent drill string in electric drilling and in view of the problems like automatic sealing while makeup and breakout of intelligent drill string and leaking of core component at high pressure, a rotating dynamic/static sealing structure for core component applicable to intelligent drill string was chosen according to service environment and technological requirement, and finite analysis was conducted to the main factors like initial compressibility, medium pressure, rotation speed of needle rotation shell and outlet rotation shell which affect the sealing performance, and the rotating sealing performance of the sealing structure was further improved. Finally, its rationality and using effect were proved by experimental tests. The result shows that the sealing ring has a good sealing performance when initial compressibility is 17%; the double-triangle slip ring acts as a retainer ring, so this sealing structure can stand a high pressure of 10 MPa; the sealing performance of the sealing ring is the best when the rotation speed of needle rotation shell or outlet rotation shell is below 2 rad/s. Using the combined sealing of O-ring with triangle slip ring and optimizing the related parameters of this sealing structure has effectively addressed the problem of key sealing of intelligent drill string, and hence ensures effective and rapid transmission of electrical signals and power of electric drill,which further promotes the development of intelligent drill string.