Research and Development of a New Reverse Spiral Electro-Hydraulic Steering Device for Coiled Tubing Drilling

在油气田开发与生产的过程中，连续油管钻井作为一种可内置电缆进行井下双向通电通讯的易于实现井下自动化的小井眼前沿钻井技术，被广泛应用于油气井开窗侧钻、老井加深、死井复活、径向射孔等钻井领域，在国内外具有广泛的应用前景。然而，由于连续油管在井下作业过程中不能旋转，只能通过井下转向器实现定向，转向器作为连续油管钻井定向工具要保证钻具工具面的调整，实现连续油管定向钻井。该连续油管转向器外径95.25 mm，工作最大扭矩882.57 N∙m，单次转动角度为1˚，精度可达±0.5˚，且验证了该连续油管钻井反向螺旋电控液动转向器在刚性条件下通过性满足设计要求。因此，该连续油管钻井反向螺旋电控液动转向器的研制可对连续油管钻井提供技术支撑。In the process of oil and gas field development and production, continuous tubing drilling is a small frontier drilling technology that is easy to implement automation underground by installing cables for bidirectional electrical communication. It is widely used in the drilling fields of window sidetracking of oil and gas wells, deepening of old wells, resurrection of dead wells, and radial perforation, and has a broad application prospect both at home and abroad. However, since continuous tubing does not rotate during underground operation, it can only be directed underground through a downhole steering device. The downhole steering device, as a directional tool for continuous tubing drilling, must adjust the tool face to ensure continuous tubing directional drilling. The outer diameter of the continuous tubing steering device is 95.25 mm, the maximum torque during operation is 882.57 N∙m, the single rotation angle is 1˚, and the accuracy can reach ±0.5˚, which verifies that the trafficability of the continuous tubing directional drilling reverse spiral electric-hydraulic steering device meets the design requirements in rigid conditions. Therefore, the development of the continuous tubing directional drilling reverse spiral electric-hydraulic steering device can provide technical support for continuous tubing drilling.