微小井眼电机驱动CT牵引器控制系统设计

微小井眼连续管(CT)井下作业技术在钻井、测井、修井、完井、气举采油等方面优势突出,但因微小井眼直径小,CT在井眼中不旋转,井下遇阻严重,送进困难,严重影响该项钻井技术的应用与推广。在分析国内外牵引器研究现状的基础上,设计了一种微小井眼井下电机驱动CT牵引器控制系统。该系统直接利用4个伺服电机驱动与控制牵引器牵引井下CT下入和取出,减少了利用循环液驱动时对液压能的依赖性和利用循环液压阀来控制管路的复杂性,节省了液压管路的空间,使作业过程能正常循环井底液体。CT牵引器控制系统适用于小井眼井下牵引作业,稳定性好,牵引灵活,牵引速度快,解决了因井下CT摩阻较大,下入和取出困难等技术难题,增加了CT在井下的延伸长度,将促进我国微小井眼CT井下作业技术发展。

Design of the Control System for Motor Drive CT Traction Device in Slim Hole

On the basis of analyzing the present situation of CT traction device,the control system of downhole motor drive CT traction device for slim hole operation was designed.The system directly uses four servo motors to drive and control the traction device to drag downhole CT to conduct smooth tripping in and out.As a result the dependence on hydraulic energy in application of circulation fluid to conduct driving and the complexity in application of circulation hydraulic valve to control pipeline were reduced.The space of hydraulic pipeline was saved.The bottomhole fluid could be circulated normally in the operating process.The CT traction device control system is suitable for downhole traction operation in slim hole.It is desirable in stability,flexible in traction and fast in traction speed.It has solved the technological difficulty of CT tripping in the slim hole caused by remarkable downhole CT friction.It ensures CT to operate in slim hole with greater length,contributing to the technological development of CT downhole operation in slim hole in China.