Novel PDC drill bit utilizing impact effect for improving heart rock breaking efficiency

Abstract

The invention belongs to the field of technical equipment used in oil and natural gas drilling engineering, mine exploiting, geological drilling, constructional engineering, tunnel engineering, shielding and non-excavation, and relates to a novel PDC drill bit utilizing the impact effect for improving heart rock breaking efficiency. The PDC drill bit solves the problems that in the drilling process, a center rock column left in the center part influences drilling efficiency, and the position deviating from the center of a well hole shakes left and right. According to the technical scheme, the upper end of a turbine is fixed through a nut, the lower end of the turbine is fixed through a boss on a turbine shaft, an upper cam is connected to the turbine shaft through threads, a lower cam is fixed to a punch hammer through a sunk screw, the upper section of the punch hammer is hollow, a pore passage enabling drilling fluid to flow out is formed in the upper end of a shell on the lower portion, a pressing head with the top end provided with a tip-shaped PDC tooth is added to the tail end of a connecting cavity, as a main impact part, the lower end of the punch hammer becomes thin, and a bi-directional thrust ball bearing is placed at the lower end. The equipment enables the heart to generate longitudinal impact, improves the rock breaking efficiency and reduces drilling cost.

Description

technical field [0001] The invention belongs to the field of technical equipment such as oil and gas drilling engineering, mining, geological drilling, construction engineering, tunnel engineering, shield tunneling and non-excavation, and relates to a novel PDC drill bit which utilizes impact to improve the rock-breaking efficiency of the core. Background technique [0002] At present, the drilling industry in various countries in the world has begun to gradually develop into the field of deep wells and ultra-deep wells. With the increase of drilling depth, rocks will have obvious hardness and strength increases under the action of formation confining pressure, and the extreme value of drillability Relatively high, these factors will lead to slower drilling speed, thereby increasing drilling costs. This puts forward higher requirements for the rock-breaking efficiency and service life of the new generation of PDC drill bits. Due to the interference of external factors durin...

AI Technical Summary

Problems solved by technology

Due to the interference of external factors during normal work, the conventional PDC bit often deviates from the center of the borehole and sways left and right, and the rock-breaking efficiency is high on the periphery of its contour, while relatively few PDC bits are often arranged in the center. Cutting teeth, often leave a section of central rock pillar and affect the drilling effect

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