A sharp ridge cutting tooth

Abstract

The invention discloses a ridge-shaped cutting tooth, which comprises a cylindrical body, and is characterized in that: the upper end of the body is provided with a tooth end surface, the outer edge of the upper end is provided with a tooth top surface, and the side wall is provided with a tooth flank. The tooth end surface includes at least two oblique intersecting transition surfaces. Each transition surface meets the upper surface of the body to form an outwardly convex tooth end surface. The intersection of two adjacent transition surfaces forms a convex ridge. The outer end of one of the convex ridges is connected to The top surfaces of the teeth meet, and the side surfaces of the teeth include two offset wedge surfaces respectively arranged on both sides of the convex ridge that meets the top surface of the tooth. A sharp ridge is formed, and the lower end of the partial wedge surface extends to the side wall of the body or the bottom surface of the body. The present invention can effectively disperse the stress of the cutting teeth during rock breaking by setting the sharp ridges, improve the impact resistance of the cutting teeth, and the sharp ridges can effectively wedge into the formation, effectively release the formation stress, and improve the rock breaking efficiency.

Description

technical field [0001] The invention relates to a sharp ridge cutting tooth, which is applied in the technical field of oil and natural gas drilling. Background technique [0002] In the exploration and development of oil and natural gas resources in recent years, deep well drilling and ultra-deep wells have become the main force to improve the development of oil and gas resources. In such oil and gas drilling, hard formations and interlayer formations are often encountered, and as the well depth increases, drilling The cost is getting higher and higher, so increasing the drilling speed in hard formations and interlayer formations has become an important way and method to shorten the drilling cycle and reduce drilling costs. It is known that in the drilling of soft to medium hard formations, the first choice of PDC bit drilling has become the behavior standard of the oil drilling industry; however, in drilling practice, the drill bit will produce vibration when drilling in a...

AI Technical Summary

Problems solved by technology

It is known that in the drilling of soft to medium hard formations, the first choice of PDC bit drilling has become the behavior standard of the oil drilling industry; however, in drilling practice, the drill bit will produce vibration when drilling in any formation, and when drilling hard formations and interlayer formations, The vibration of the drill bit is more serious, which will cause the drill bit to "swivel", which will cause serious early wear of the PDC bit, and will accelerate the bluntness of the drill bit and the failure of the drill bit; replacing the drill bit will increase the operation time of drilling and tripping, and will increase the drilling cost.

[0003] In the existing design scheme of drill bit, although the conventional round-tooth drill bit has a certain impact resistance, its speed-up effect is already limited, and the drilling pressure can only be increased to increase the ROP, but this method will accelerate the wear and tear of the drill bit. The blunting speed of the drill bit will increase the number of drill bits used; therefore, people have proposed pointed teeth to improve the ability of the drill bit to penetrate the formation, thereby improving the rock-breaking efficiency of the drill bit, but although the pointed tooth can improve the ability to penetrate the formation , but its structure is not as good as the round teeth for chipping and wear resistance

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