Secondary rock breaking drill bit for assisting pressurizing flow back through spiral blade

Abstract

The invention provides a secondary rock breaking drill bit for assisting pressurizing flow back through a spiral blade. The secondary rock breaking drill bit comprises a drill bit body, the blade anda cone; the blade is arranged at the top end of the drill bit body, and the blade and the drill bit body are of an integrated structure; and a gauge protection part is arranged on the outer wall of the blade. Through improvement for the rock breaking drill bit, primary cutting is conducted at the bottom of the drill bit to form primary rock debris, the rock debris returns to the cone under carrying flow back of a well-drilling fluid, the cone can conduct secondary breaking, the spiral blade slides in the longitudinal direction to be in surface contact with the well wall, a surface contact modeof the spiral blade is far greater than a line contact mode of a traditional straight blade, longitudinal vibration in the well-drilling process can be reduced, the rock debris generated by cutting of the drill bit flows back upwards under the action of vertical component force of the spiral face, fluid carrying the rock debris generates reactive force on the spiral blade surface, the drill bit can be pressurized, and thus the problems and deficiencies proposed in the background technology are effectively solved and overcome.

Description

technical field [0001] The present invention relates to the technical field of rock-breaking drill bits, and more specifically, relates to a method of auxiliary flowback realized by means of helical feeding, while the reaction force acts on the drill bit to increase the drilling pressure, and at the same time, the design of the helical structure reduces the breakage during the working process. Vibration of the rock drill bit. Background technique [0002] At present, in difficult-to-drill formations, the service life of the drill bit and the ROP are in urgent need of improvement. However, with the development of materials science, the technology of PDC composite sheet materials is becoming more and more mature. As a result, the PDC-cone composite drill bit was born, which has the advantages of high drilling efficiency, stable deflection, and long service life of the drill bit in hard formations, dense formations, highly abrasive formations and directional wells. Although c...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a secondary rock-breaking drill bit with the aid of a helical blade to pressurize and flow back, so as to solve the drill bit stability problem in the working process of the drill bit proposed in the above-mentioned background technology. A stabilizer is installed on the drill pipe to reduce the vibration of the drill bit, which will cause frequent tripping and greatly increase the drilling cost; the auxiliary flowback currently mainly depends on the design of the hydraulic parameters of the surface pump set, and the distribution of the surface pump set to the drill bit. flowback

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