Research And Application Of Electric Top Drive Drilling System In Deep Hole Core Drill

Drilling system is always thought to be as the core of geological drill, whose working ensures the safety, sample quality, and economical interest. The traditional drilling system’s performance, including mainly spindle type drill, power head drill and rotary table drill, has failed to meet the frequently updated demand for geological drilling. The goal of this paper is to design a novel electric top drive through the following three aspects:theoretical analysis, computer simulation, and lab experiment. Some satisfying results are finally obtained.First, on the basis of column mechanical, friction theory, and hydromechanics, three models of torque friction between drill string and borehole wall, of tripping operation, and of vascular resistance are established. Mechanical analysis in different drilling stages is made to provide data for further work.Second, advantages of different traditional drilling systems, including spindle type drill, power head drill, rotary table drill and top driver drill are compared and summarized. An overall drilling system, adopting inverter direct drive top drive system, is finally developed considering the advantages of petroleum drilling system.Thirdly, some key components, including main spindle, guide, tong, elevator, clip and automatic drilling system are designed by utilizing virtual prototype theory. Furthermore, mechanical models for key carriers are developed by utilizing the basic theory of multi-body dynamics. The software of CREO is applied to conduct the finite element analysis of the main spindle and drawwork under two different working conditions, such as twist power transmission and braking torque transmission. The software of ADAMS is applied to conduct the simulation analysis for three models, such as couple model of top driver and guid, elevators swing model and trip operation model. Based on the virtual prototype which is characterized by standardization, modularity and versatility, the overall system design is optimized.In addition, some auxiliary equipment, including inclined cycle plane tong, hydraulic Elevators and pneumatic clip are innovatively developed in terms of wire-line drill pipe in large diameter. This successful address the problems of automatically breakout in high location and safety lifting, as well as effectively clip of wire-line drill pipe in drilling system. The optimization of loading, diameter and operation can effectively enhance the adaptation of wire-line coring in different diameters. The experiments also improve the working efficiency, reliability and safety.Lastly, a physical prototype of type XD35DB was eventually manufactured, which was tested in field of the project of CUSD-1. The results show that this novel design breaks many limits in traditional drilling system, including working capacity, energy consumption, efficiency, and intelligent manipulation. Its power especially displays in preventing accident, deviation, and torque monitoring in the borehole. This paper also provides both theoretical support and practical data for further research.