Research on Vibration Reduction, Energy Enhancement, and Speed Increase Methods for Drilling String in Deep Heterogeneous Strata

There are a series of problems in the drilling process of deep heterogeneous formations, such as severe drilling string vibration, slow rock-breaking drilling speed, and the short practical working life of drill bits. It is urgent to develop supporting technical methods for breakthroughs. Based on the main characteristics of the drilling environment in deep formations and the results of drilling string dynamics research in recent years, a technical equipment design concept was proposed to use the vibration of the drill string during the drilling process in heterogeneous formations to improve the hydraulic energy of the bottom hole drilling fluid and thus improve the drilling speed. A technical equipment research and development design was carried out to use the vibration energy of the drill string to enhance the injection energy of the bottom hole drilling medium, and a vibration reduction and energy enhancement device for the bottom hole drill string was developed; we conducted on-site acceleration effect testing, and the research results showed that the vibration of the drill string contains enormous energy, which can be converted into rock-breaking acceleration energy; The designed vibration reduction and energy enhancement device for the bottom hole drilling string can enhance the injection energy of drilling fluid, and reduce the harm of preparing a string vibration; The vibration reduction and energy enhancement device of the bottom hole drill string can significantly improve the drilling speed. The research results have opened up new directions for deep well acceleration technology and provided equipment support for accelerating the exploration and development of deep oil and gas resources. It is recommended to strengthen further the research on the basic theory of downhole drill string vibration, the acceleration technology equipment based on drill string vibration, and vibration acceleration methods.