PDC (Polycrystalline Diamond Compact) drill bit
A drill bit and cutting surface technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling, etc., can solve problems such as lateral vibration or whirl, PDC cutter damage, large confining pressure, etc., to avoid early damage and increase mechanical penetration rate , the effect of improving the service life
Inactive Publication Date: 2021-08-03
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
When drilling deep rocks, due to the high confining pressure and high rock strength in the deep rocks, it is difficult for the drill bit to penetrate and break the rock, so the mechanical drilling speed of the drill bit is very slow.
In addition, the existing PDC drill bit is prone to lateral vibration or whirl under the action of lateral cutting force, which will cause early damage to the PDC cutting teeth, thereby reducing the service life of the drill bit
Method used
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Embodiment Construction
[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0027] see Figure 1 to Figure 6 . A PDC drill bit provided by an embodiment of the present application may include: a drill bit body 14, which has a first end 17 and a second end 19 opposite to each other; joint 15; a plurality of blades 21, which are circumferentially arranged on the outer wall of the first end 17 of the drill body 14, and each of the blades 21 includes a plurality of cutting portions arranged in a stepped manner in the axial direction 22; the ...
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The invention provides a PDC (Polycrystalline Diamond Compact) drill bit. The PDC drill bit comprises a drill bit body and a plurality of blades, wherein the drill bit body is provided with a first end and a second end which are opposite to each other; the second end is connected with a drill pipe; the plurality of blades are arranged on the outer wall of the first end of the drill bit body in the circumferential direction, and each blade comprises a plurality of cutting parts which are arranged in a step shape in the axial direction; cutting teeth which are used for cutting rock are arranged on the cutting part; and the radial overall dimensions of all the cutting parts on the blades are increased in sequence in the direction from the first end to the second end, so that the rock can be cut in sequence by the blades through all the cutting parts. According to the PDC drill bit provided by the invention, the mechanical drilling speed can be increased, the transverse vibration of the drill bit is reduced, and the early damage to the PDC cutting teeth is avoided, so that the service life of the drill bit is prolonged.
Description
technical field [0001] The invention relates to a PDC drill bit. Background technique [0002] With the development of deep wells and ultra-deep wells in oil and natural gas production, the cost and difficulty of drilling are constantly increasing. The development of high-efficiency rock-breaking drill bits is of great significance to improve drilling efficiency and reduce drilling costs. [0003] Existing PDC drill bits generally include a drill body, cutting teeth and blades. The cutter wing is arranged on the drill bit body, and the cutting teeth are fixed on the cutter wing. When drilling deep rocks, due to the high confining pressure and high rock strength in the deep rocks, it is difficult for the drill bit to penetrate and break the rock, so the mechanical drilling speed of the drill bit is very slow. In addition, the existing PDC drill bit is prone to lateral vibration or whirl under the action of lateral cutting force, which will cause early damage to the PDC cutt...
Claims
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IPC IPC(8): E21B10/43E21B10/32E21B10/54E21B10/60
CPCE21B10/32E21B10/43E21B10/54E21B10/60
Inventor 喻开安曹通赵欣史东铠张爱潇
Owner CHINA UNIV OF PETROLEUM (BEIJING)