high speed balanced pdc drill bit for oil drilling

Abstract

The invention relates to the technical field of oil drilling, and particularly discloses a high-speed balanced PDC drill bit for oil drilling. The technical solution is: the lower end of the upper joint is connected to the center drill through the butt joint, and the main body of the boring drill is driven and connected through the boring and milling transmission sleeve; multiple groups of milling drill main bodies are arranged in the cavity between the main body of the boring drill and the central drill. The outer wall of the main body of each milling bit is equipped with a speed transmission intermediary wheel, through which the teeth on the outer wall of the butt joint and the teeth on the inner wall of the boring and milling transmission sleeve are engaged; the main body of the milling bit is equipped with a speed transmission bearing and a speed transmission pressure cap , there is a graded bearing between the boring and milling transmission sleeve and the upper joint; the beneficial effect is that the central drill bit of the present invention can drill downward, and the milling drill bit main body can realize the rotary drilling function of self-rotation and revolution around the central drill bit, and the boring The main body of the cutting bit rotates around the center bit, which reduces the rotational speed of the main body of the boring bit, reduces the burning phenomenon of the outer diameter part, and improves the service life of the bit.

Description

Technical field [0001] The present invention relates to the field of petroleum drilling technologies, and more particularly to a high-speed balance PDC drill bit for petroleum drilling. Background technique [0002] During the mining of oil, the drilling is an important part. In the current drilling process, the performance of the drilling is the direction of each drill company has been working hard, and the existing drill bit is an important tool for oil drilling work. First, whether the drill bit adapts to the nature of the rock and its quality, it plays a very important role in choosing a drilling process, especially the impact on drilling quality, drilling speed, drilling cost, PDC drill bit is today's oil and A rock tool widely used in the natural gas exploration and development industry, it effectively improves the mechanical drilling, shortening the drilling cycle; the PDC drill bit has four components, namely diamond composite, nozzles, carcass, and drill bodies. The prob...

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Problems solved by technology

[0002] In the process of oil extraction, drilling is an important link. In the current drilling process, improving the performance of drilling tools is the direction that various drilling tool companies have been working hard, and the existing drill bit is one of the important tools for oil drilling. First, whether the drill bit is suitable for the nature of the rock and its quality plays a very important role in the selection of drilling technology, especially has a huge impact on the drilling quality, drilling speed, and drilling cost. A rock-breaking tool widely used in the natural gas exploration and development industry, which effectively improves the mechanical drilling tool and shortens the drilling cycle; the pdc drill bit mainly has four components, namely, diamond compact, nozzle, matrix and drill body. The existing problem is: when drilling, the pdc drill bit goes downhole and rotates under the drive of the drill pipe, so as to realize drilling. When the diamond composite sheet is polished or damaged, it is impossible to continue drilling, and the drill pipe can only be lifted When drilling a shallow oil well, the time for replacing the drill bit is relatively short, which is acceptable; but when drilling a deep well of several kilometers, when the drill bit needs to be replaced, the drill pipe needs to be replaced one by one. Lifting, the existing drill pipes generally have a length of about 7-13 meters, and about 500 drill pipes are needed for a well depth of 5,000 meters. Such lifting and lowering will cause a lot of time wasted on tripping the drill pipes , causing the cost of drilling to rise sharply, forming a huge drilling cost, therefore, how to improve the service life of the pdc drill bit is of great significance

[0003] In addition, when the diameter of the hole to be drilled is large, a pdc drill bit with a larger diameter is required, but the larger the diameter, it will bring about a problem, the difference between the linear speed of the rotation at the center of the lower end of the drill bit and the linear speed of the outer diameter of the drill bit It is very large, that is to say, the rotational angular velocity of the central position and the outer diameter part is the same under the drive of the drill pipe, but the linear velocity of the rotation is very different, which causes the outer diameter of the large diameter drill bit to quickly In the case of burning drill, the hardness of the drill bit is reduced, which will lead to the rapid loss of performance of the drill bit and reduce the service life, so that the drill bit can only be replaced frequently, resulting in a multiplied increase in drilling costs

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