An Electric Pulse-Mechanical Composite Rock Breaking Drill Bit for Deep Difficult-Drilling Formation

Abstract

The invention relates to an electric pulse-mechanical composite rock-breaking drill bit for deep difficult-drill formations. The structure of the electric pulse-mechanical composite rock-breaking drill bit for deep hard-to-drill formations includes an outer ring PDC drill bit, a coaxial cable, a joint, an insulating sleeve, a spring, a cable connecting rod, a casing, a low-voltage grounding electrode and a high-voltage center electrodes etc. The composite drill bit combines the traditional mechanical drill bit with the electrode drill bit to realize the simultaneous electric pulse rock breaking and mechanical rock breaking, which not only improves the rock breaking efficiency, but also makes it easier to discharge the cuttings with the drilling fluid; at the same time, it is also easy to control the drilling trajectory , Deep well drilling and low cost.

Description

technical field [0001] The invention relates to a high-efficiency rock-breaking drill bit used in the oil and gas drilling and development process, especially an electric pulse-mechanical composite rock-breaking drill bit used in deep difficult-drill formations. Background technique [0002] In recent years, China's oil and natural gas imports have continued to grow. In order to reduce my country's dependence on foreign oil and gas resources and ensure national energy security, it is necessary to continue to increase oil and gas exploration and development. my country currently exploits mainly shallow oil and gas resources, which are gradually depleted due to massive exploitation, while deep oil and gas resources are still very rich, of which oil resources account for 40% and natural gas resources account for 60%, which is The field with the largest amount of remaining land resources and the greatest development potential. Therefore, marching into the deep part of the earth ...

AI Technical Summary

Problems solved by technology

At present, some people have proposed to use electrode drill bit + electrode impregnated teeth for deep well drilling. Although this kind of drill bit can use high-voltage electric pulses to break rocks, the electrode drill bit needs to be driven by the drill pipe to rotate mechanically to further break the cuttings. During the process, the bottom hole debris wears the electrode bit seriously, which puts forward high requirements on the performance of the electrode material, which cannot effectively reduce the drilling cost

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