Impact voltage rock breaking combined drilling tool for improving mechanical drilling speed of hard stratum

Abstract

The invention provides an impact voltage rock breaking combined drilling tool for improving the mechanical drilling speed of a hard stratum. The problems that an existing drilling tool is low in drilling efficiency, large in drill bit abrasion and high in drilling cost are mainly solved. The impact voltage rock breaking combined drilling tool is characterized in that the upper end of an impact voltage rock breaking drill bit (1) is sequentially connected with a mud current sleeve (2), an impact voltage generator short circuit (3), a lithium battery short circuit (4) and an underground power generation short circuit (5) from bottom to top, wherein an insulating righting bearing (21) is arranged at the upper end of the interior of a drill bit shell (3), the lower end of the interior of the drill bit shell (3) is connected with a spring sleeve (27), the spring sleeve (27) is connected with an electrode holder (24), and the electrode holder (24) is connected with a low-voltage grounding electrode (28) and a high-voltage center electrode (29). The impact voltage rock breaking combined drilling tool for improving the mechanical drilling speed of the hard stratum can be used for impact voltage discharge rock breaking construction, the drilling efficiency is high, the cost is low, the drill bit is not prone to abrasion, and the impact voltage rock breaking combined drilling tool is suitable for drilling various types of wells.

Description

technical field [0001] The invention relates to the field of machinery, in particular to a combination drilling tool for rock-breaking with an impact voltage used in hard formations to increase the speed of penetration. Background technique [0002] Drilling in deep hard rock formations is still a major challenge for drilling technology. The main problems are high drill bit wear and low ROP. When the current drilling tools are used in deep wells, ultra-deep wells and hard formations such as hot dry rocks, the drilling speed ranges from 1m / h to 2 m / h, the drilling efficiency is low, the drill bit is worn out, and the tool life is about 50-60h. Cause high drilling cost. [0003] Shock voltage discharge rock breaking is a newly developed rock breaking technology in recent years. This technology uses the mechanical effect of shock waves, jets or plasma channels generated by shock voltage discharge to cause cracks in rocks until they are broken. It has controllable energy, no po...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of low drilling efficiency, high drill bit wear and high drilling cost of the existing drilling tools, the present invention provides a combination drilling tool for rock breaking with impact voltage for increasing the ROP in hard formations. The impact voltage rock-breaking combination drilling tool of the mechanical speed of penetration can be used for the impact voltage discharge rock-breaking construction, the drilling efficiency is high, the cost is low, the drill bit is not easy to wear, and it is suitable for drilling various types of wells

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