Three-cone drill bit for particle impact drilling

Abstract

The invention relates to a three-cone drill bit for particle impact drilling. The three-cone drill bit is composed of jaws, cones, teeth, particle jet flow preparing nozzles, a joint and a drill bit body. The particle jet flow preparing nozzles are made of hard alloys and are connected with the drill bit body in a brazed mode. The outlet positions and inclined angles of the nozzles are all different, and the arrangement positions of the teeth on the three cones are also different. Prepared particle jet flows can completely cover the shaft bottom, meanwhile it can be ensured that the particle jet flows penetrate through gaps of the teeth and the cones, and the situation that the particle jet flows directly impact the cones and the teeth is avoided. Through the main working mode that impactof the particle jet flows is used for rock-breaking drilling and the auxiliary working mode of mechanical rock-breaking drilling of the cones and the teeth, and the drilling efficiency of a hard stratum and a high-grindability stratum is greatly superior to that of an existing cone drill bit; and under the extreme condition, when a ground particle injection system breaks down, the three-cone drillbit can also be used as a common cone drill bit to conduct rock-breaking drilling, and thus operation risks are avoided effectively.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering drilling, in particular to a tri-cone drill bit for particle impact drilling. Background technique [0002] With the gradual depletion of shallow oil and gas resources in my country, the development of deep oil and gas resources is accelerating. During the drilling of deep and ultra-deep wells, hard formations and strong abrasive formations have become an important factor restricting the ROP. Take the Xujiahe and Zhenzhuchong Formation as an example, the average ROP of the roller cone bit is only 0.7-1.34 m / h, and the footage of the hard formation and strong abrasive formation accounts for 4%-10% of the total well, but the drilling time However, it accounts for 25-30% of the drilling cycle of the whole well. Low drilling speed and long drilling time bring about long drilling cycle and high development cost, which restricts the overall development benefits of deep oil and gas resources;...

AI Technical Summary

Problems solved by technology

[0002] With the gradual depletion of shallow oil and gas resources in my country, the development of deep oil and gas resources is accelerating. During the drilling of deep and ultra-deep wells, hard formations and strong abrasive formations have become an important factor restricting the ROP. Take the Xujiahe and Zhenzhuchong Formation as an example, the average ROP of the roller cone bit is only 0.7-1.34 m / h, and the footage of the hard formation and strong abrasive formation accounts for 4%-10% of the total well, but the drilling time However, it accounts for 25-30% of the drilling cycle of the whole well. Low drilling speed and long drilling time bring about long drilling cycle and high development cost, which restricts the overall development benefits of deep oil and gas resources; at the same time, the roller cone bit In hard formations with drilling speed and strong abrasive formations, the phenomenon of tooth wear, broken teeth, and tooth loss also occurs from time to time, and the life of the drill bit is too short. The footage is less than 20 meters, and the frequent tripping and tripping caused by the replacement of the drill bit also further reduces the development benefits of deep oil and gas resources

[0003] Foreign studies have shown that particle impact drilling technology can greatly increase the ROP in hard formations and strongly abrasive formations, and the final execution component of particle impact drilling is the drill bit, but the existing roller cone bits are difficult to apply to particle impact drilling technology In this process, there are many problems to be solved, such as how to modulate the high-efficiency and dense particle jet, how to effectively cover the bottom of the well with the particle jet formed by the nozzle, and how to prevent the particle jet from directly impacting the cones and teeth, etc.

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