Cone single roller bit

Abstract

The present invention relates to a single cone bit used for petroleum well drilling and geological prospecting field. The single cone bit includes a bit body and a cone. The bit body is connected to the cone through a bias bit leg journal at lower end. It is characterized in that the cone surface is composed of a main distribution tooth surface and at least one auxiliary distribution tooth surface; the main distribution tooth surface is cone surface or cone ball surface, the auxiliary distribution tooth surface is ball surface or truncated cone surface. The main distribution tooth surface and the auxiliary distribution tooth surface are mounted with teeth. The invention adopts a cone shape combined by main and auxiliary distribution tooth surfaces, and can reduce the tooth scrape distance, make the cutting load of each part of teeth of the cone be reasonably distributed in order to reduce the abrasion of the teeth and reinforce the impact effect of the teeth to make the bit can be adapted to break rigid ground and prolong the effective use life of the bit. The invention can increase the cone surface, dispose plurality of teeth, and can make the reverse composite force of the rock for the cone bit adjacent to the bit axes; the invention also can satisfy the requirements for drilling different ground.

Description

technical field [0001] The invention relates to a single-cone drill bit used in the fields of oil drilling and geological exploration. Background technique [0002] The single cone bit is mainly composed of a bit body and a cone. The bit body is connected to the cone through the offset palm journal at the lower end. The cone not only revolves with the bit body but also rotates around the palm journal line during operation. To achieve its task of scraping and breaking rocks. At present, most of the single-cone bits that have been used in actual production are spherical cones. The spherical cones rely on the teeth arranged on the spherical surface to scrape and break rocks at the bottom of the well, forming a network of cutting tracks. In soft formations and medium-hard formations It has high ROP and service life, but in hard and abrasive formations, due to the existence of permanent contact zone, some teeth are seriously worn in advance, and the average ROP and service life ...

AI Technical Summary

Problems solved by technology

At present, most of the single-cone bits that have been used in actual production are spherical cones. The spherical cones rely on the teeth arranged on the spherical surface to scrape and break rocks at the bottom of the well, forming a network of cutting tracks. In soft formations and medium-hard formations It has high ROP and service life, but in hard and abrasive formations, due to the existence of permanent contact zone, some teeth are seriously worn in advance, and the average ROP and service life of the roller cone bit are low, so that the single The performance and range of the roller cone bit are affected and limited to a certain extent

Images