PDC drill bit with rear-row tooth water holes

Abstract

The invention discloses a PDC drill bit with rear-row tooth water holes, and belongs to the technical field of petroleum and gas drilling. The drill bit comprises a drill bit body and a plurality of blades extending from the drill bit body or fixed on the drill bit body, wherein a drilling fluid flow channel is formed between every two adjacent blades; front-row cutting teeth are arranged on the blades; at least two rows of cutting teeth are arranged on at least one blade; and water holes, namely the rear-row tooth water holes, are formed between the front-row cutting teeth and rear-row cutting teeth of at least one blade on the drill bit. The rear-row teeth are arranged on a drill bit structure; in a drilling process of hard and high-temperature stratums, the rear-row teeth can cut rocks in time under the condition that main cutting teeth are out of work, so that the drilling efficiency of the drill bit in the stratums is improved, and the service life of the drill bit is prolonged. Meanwhile, the water holes are formed in the blades and the drill bit body (especially in a flow channel groove) at the same time, so that the cooling and chip removal capacity of the drill bit can be further enhanced, the thermal abrasion of the cutting teeth is greatly weakened, and the drilling capacity of the drill bit in the high-temperature, high-hardness, high-abrasiveness and inhomogeneous stratums is further improved.

Description

technical field [0001] The invention belongs to the technical fields of drilling such as petroleum and natural gas, mining engineering, geothermal well, building foundation engineering construction, geology, hydrology, etc., and particularly relates to a PDC drill bit with a rear tooth water hole. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. In addition to the cutting structure, the hydraulic structure on the drill bit also plays an important role in the rock-breaking efficiency and service life of the drill bit, that is, cooling the cutting teeth, cleaning the bottom of the well, transporting cuttings, and assisting in rock breaking. At present, the design of the hydraulic structure on the drill bit is to arrange nozzles or water holes at different positions on the drill bit body, and the drilling fluid or cooling medium in the inner flow channel is sprayed out through the nozzles or wate...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: aim at the deficiencies of the existing drill bit technology, propose a PDC drill bit with rear row of teeth water holes, solve the poor cooling effect of the rear row of cutting teeth of the drill bit, and it is difficult to discharge the cuttings in time, thereby reducing the rock breaking efficiency of the drill bit and The problem of service life

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