A high build-up rate drill bit suitable for push-by rotary steerable drilling technology
A technology of rotary steerable drilling and build-up rate, applied in directional drilling, drill bits, drilling equipment, etc., can solve the problems of low build-up capacity, inability to complete build-up, ignoring the drill bit, etc., to improve build-up ability and build-up performance , The effect of prolonging the life of the drill bit
Active Publication Date: 2021-11-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
These three methods can achieve the effect of improving the deflection capacity to a certain extent, but the improvement effect is still not ideal. The reason is that the role played by the drill bit in the deflection is ignored. , the rock-breaking process cannot be realized, and the deflection cannot be completed.
[0004] However, the existing drill bits are all designed to increase the axial drilling speed of the wellbore, and the lateral cutting ability of the drill bit is low, resulting in low deflection ability. The corresponding relationship of cutting capacity does not meet the requirements of push-by rotary steerable drilling technology
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[0047] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0048] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0049] In the present invention, terms such as "connected" and "connected" should be understood in a broad sense...
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The invention discloses a high deflection rate drill bit suitable for push-to-type rotary steerable drilling technology, which comprises a drill bit joint and a drill bit crown; a plurality of drill bit blades are arranged on the drill bit crown; a first inner cone surface and a first top arc surface The main cutting teeth and auxiliary cutting teeth are set on the upper and second top arc surfaces; several gauge auxiliary teeth are set on the rear end of the main cutting teeth on the first gauge surface and the second gauge surface; the first gauge surface, the second gauge surface The protruding height of the main cutting teeth and auxiliary teeth on the gage surface is 0.1mm to 5.0mm; The back rake angle of the main cutting teeth gradually decreases from the end close to the central axis of the drill bit to the outside along the direction of the generatrix. The present invention improves the lateral cutting capability by setting the relevant main cutting teeth and gauge auxiliary teeth protruding from the corresponding gauge surface height, and realizes the lateral cutting capability and axial cutting ability of the drill bit through the change of the back rake angle of the relevant main cutting teeth. Reasonable regulation of capacity.
Description
technical field [0001] The invention belongs to the technical field of drilling engineering, and in particular relates to a high build-up rate drill bit suitable for push-back rotary steerable drilling technology. Background technique [0002] The push-by rotary steerable drilling technology is one of the most common rotary steerable technologies, and further improving the deflection capability of this technology is an urgent problem to be solved. [0003] There are three main methods to improve the deflection building ability of push-on rotary steerable drilling technology: (1) Optimizing drilling parameters; (2) Optimizing drilling tool assembly; (3) Strengthening the pushing force of tools. These three methods can achieve the effect of improving the deflection capacity to a certain extent, but the improvement effect is still not ideal. The reason is that the role played by the drill bit in the deflection is ignored. , then the rock-breaking process cannot be realized, an...
Claims
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IPC IPC(8): E21B10/26E21B10/43E21B10/60E21B7/06
CPCE21B7/061E21B10/26E21B10/43E21B10/60
Inventor 刘永旺黄勇邹德永管志川史玉才
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)