Electric pulse-mechanical composite rock breaking drill bit for deep stratum difficult to drill

Abstract

The invention relates to an electric pulse-mechanical composite rock breaking drill bit for a deep stratum difficult to drill. The electric pulse-mechanical composite rock breaking drill bit for the deep stratum difficult to drill structurally comprises an outer ring PDC drill bit body, a coaxial cable, a connector, an insulating sleeve, a spring, a cable connecting rod, a sleeve body, a low-voltage grounding electrode, a high-voltage center electrode and the like. According to the composite drill bit, a traditional mechanical drill bit and an electrode drill bit are combined, electric pulse rock breaking and mechanical rock breaking are synchronously conducted, the rock breaking efficiency is improved, and rock debris is easier to discharge along with drilling fluid; and meanwhile, the drilling track is easy to control, and the deep well drilling cost is low.

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 increasingly 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%. The field with the largest amount of remaining land resources and the greatest development potential. Therefore, marching into the deep part of the earth and ex...

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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