Well drilling method and device combining heat energy and mechanical energy

Abstract

The invention relates to a well drilling method and device combining heat energy and mechanical energy. The well drilling device comprises a fuel tank (1), a two-channel connector (6), a compressor (10), a drill bit (13) and a drill rod (9). Two ends of the drill rod (9) are connected with the two-channel connector (6) and the drill bit (13) respectively; the two-channel connector (6) comprises a housing (38), a fuel channel and an air channel, the fuel channel and the air channel are arranged inside the housing (38), the fuel tank (1) is connected with the fuel channel, and the compressor (10) is connected with the air channel; the drill bit (13) comprises a drill head body (18), an upper connector (16) arranged at the upper end of the drill bit body (18) and drill bit cutting teeth (21) arranged at the lower end of the drill bit body (18). The well drilling method and device combining the heat energy and the mechanical energy can achieve rock breaking by combining the combustion heat energy with the mechanical energy to significantly improve the rock-breaking efficiency; besides, well walls can be vitrified through the combustion heat energy to become smooth and hard, casing running and well cementation can even be omitted, and the drilling costs can be saved remarkably.

Description

technical field [0001] The invention relates to the field of well drilling, and more specifically relates to a drilling method and device combining thermal energy and mechanical energy. Background technique [0002] The drill bit is a tool that directly contacts the rock during the drilling process and breaks the rock through cutting and stamping. At present, mechanical energy is widely used in drilling engineering to break rocks. The drill bits used mainly include: roller cone bits, PDC bits, diamond bits, etc. The field application shows that the rock-breaking efficiency of the roller cone bit is low, and the footage of a single bit is small, which is prone to downhole accidents such as roller cone sticking; the PDC bit wears fast and is difficult to penetrate; the diamond bit also has slow drilling speed The problem of short service life has seriously affected the speed of oil and gas exploration and development. [0003] In order to improve drilling efficiency, petrole...

AI Technical Summary

Problems solved by technology

At present, the drilling depth of the drill bit used for drilling has been limited to about 12,000 meters, and it has been impossible to increase the drilling depth.

[0005] To sum up, conventional mechanical rock-breaking tools are not effective enough to increase the ROP, and the supporting equipment of the new rock-breaking technology cannot be applied industrially. It is urgent to develop a mechanical-thermal comprehensive rock-breaking method and device, which can The method of rock breaking improves the drilling speed, saves drilling costs, and is of great significance for accelerating the exploration and development of oil and gas resources

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