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Self-balancing double-core reamer bit

A self-balancing, reaming bit technology, used in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of unbalanced force and unstable working conditions of the double-center reaming bit, and achieve improved structural design and layout. Tooth method, improve the service life, the effect of stable working condition

Inactive Publication Date: 2015-07-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a self-balancing double-centered reaming drill bit, which can solve the problem of unstable working conditions caused by the unbalanced force of the existing double-centered reaming drill bit, and improve the reaming quality and reaming speed.

Method used

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Embodiment Construction

[0027] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0028] Such as Figure 5 , Image 6 As shown, the self-balancing double-core reamer bit 100 of the present invention includes an upper pilot bit 1 and a lower reamer blade group 2. The pilot bit 1 includes a drill body 11, and the top of the drill body 11 is circumferentially arranged There are the first wing 12 of the pilot eye, the second wing 13 of the pilot eye, the third wing 14 of the pilot eye and the fourth wing 15 of the pilot eye; the upper top of the first wing 12 of the pilot eye is located at the top center of the pilot bit 1 A row of cutting teeth 3 is evenly arranged from the tip of the blade to the end of the blade on the side of the first blade wing 12 of the pilot eye facing the direction of rotation (PDC cutting teeth are gener...

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PUM

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Abstract

The invention discloses a self-balancing double-core reamer bit. The self-balancing double-core reamer bit comprises an upper pilot bit and a lower reamer wing group, wherein the upper pilot bit is provided with a first pilot blade, a second pilot blade, a third pilot blade and a fourth pilot blade, the reamer wing group is provided with two to four blades, and all blades are provided with cutting teeth for breaking rocks; an angle at 180 degrees is formed between the second pilot blade and the first pilot blade, the third pilot blade and the first pilot blade are arranged at an first angle [beta], and the fourth pilot blade and the third pilot blade are symmetrically arranged corresponding to the first pilot blade; the reamer wing group is fixed at a certain side of a lower body of a drill bit, and the reamer wing group and the pilot bit are arranged at a certain angle. The pilot drill bit of the double-core reamer bit and the force subjected by the reamer wing group in the working process are equal in force and opposite in direction in such a way that the force can be contradicted mutually so as to make the drill bit keep in a balanced and stable working state, ensure the reamer quality and improve the life of the drill bit.

Description

Technical field [0001] The invention relates to a reaming tool for petroleum, geological and coal drilling, in particular to a self-balancing double-core reaming bit. Background technique [0002] The double-core reaming bit is an integrated reaming tool that can expand the well diameter while drilling, avoiding the low efficiency and high cost caused by ordinary reaming operations. [0003] Such as figure 1 As shown, the double-core reamer bit 200 includes a pilot bit 210 and a reamer blade group 220. PDC (Polycrystalline Diamond Composite) cutting teeth are distributed on the blades of the two parts, and the two parts are concentric during operation. When rotating, the pilot bit 210 is responsible for breaking the rock and drilling into the formation 230, and the reaming blade group 220 is responsible for expanding the well diameter. [0004] Such as figure 2 As shown, the shaded area 201 is the pilot bit, the shaded area 202 is the reaming blade group, and the blank area 203 is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/26
CPCE21B10/26
Inventor 王镇全
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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