Classification and Development Status of Automatic Vertical Drilling Tools

The principle and advantages of automatic vertical drilling technology are introduced from the aspects of oil drilling and geological drilling. The automatic vertical drilling tools are classified according to different structures and working principles, and the advantages and disadvantages of each type of tools are briefly analyzed. Based on the classification, the vertical drilling tools and their technical characteristics are summarized systematically. The domestic and foreign technical gap of the automatic vertical drilling tool is analyzed. Finally, the problems of automatic vertical drilling tools and the development trend in the future are summarized. Miniaturization, coring capacity, high precision and long life are the development trend. Suggestions for future research ideas and methods include:optimization of the structure and layout of actuator components; reducing the outer diameter of the tool while increasing the internal space of the tool, thus enabling coring while vertically drilling in a small diameter wellbore; optimizing the measurement and control sensor and the sealing system of the electronically controlled vertical drilling tool to improve the overall temperature and pressure resistance; studying the response law of the heavy platform of the mechanical vertical drilling tool in complex downhole environment, and exploring the corresponding error suppression compensation method to improve the accuracy of the tool’s inclination control.