Drill bit with energy-gathered attack to unload well bottom stress and drilling method

A drill bit and energy gathering technology, applied in drilling equipment and methods, drill bits, drilling equipment and other directions, can solve the problems of complex drill bit and tool structure, low drilling efficiency, limited application scope, etc. The principle and structure are simple, and the idea is unique.

CN110905418AActive Publication Date: 2020-03-24CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-03-24

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Abstract

The invention relates to a drill bit with energy-gathered attack to unload well bottom stress and a drilling method. The drill bit comprises a drill bit body, an energy-gathered spring and a dominanceattack assembly, wherein the dominance attack assembly is installed inside the drill bit body, energy-gathered attack teeth at the bottom end of the dominance attack assembly protrude out of cuttingteeth at the bottom surface of the drill bit body, the energy-gathered spring is installed inside the drill bit body and above the dominance attack assembly, and the dominance attack assembly and thedrill bit body can axially move relative to each other but cannot rotate relative to each other, so that the energy-gathered attack teeth at the bottom end of the dominance attack assembly protrude out of the drill bit cutting teeth at the bottom end of the crown of the drill bit body to crush the well bottom to form an annular well bottom, the well bottom stress is released, the drill bit cuttingteeth at the bottom end of the crown of the drill bit body break rock under pressure and torque, the whole rock breaking process is realized by releasing the stress firstly and breaking the rock of the well bottom completely, and the drilling speed process is improved.
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Description

technical field

[0001] The invention belongs to the field of drilling engineering, and in particular relates to a drill bit with energy-gathering attack unloading well bottom stress and a drilling method. Background technique

[0002] During the drilling process, early release of the formation stress at the bottom of the well can effectively improve the rock-breaking efficiency of the drill bit, thereby increasing the drilling speed. So far, scholars at home and abroad have proposed two methods to release the bottomhole stress in advance. One is to change the bottomhole stress field by changing the shape of the bottomhole to release the formation stress. The other is a method of releasing formation stress based on hydraulic energy, represented by ultra-high pressure jet-assisted rock-breaking and speed-up technology. The method of changing the bottom hole stress field by changing the shape of the bottom hole only needs to optimize the shape of the bit, change the shape of t...

Examples

Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments.

[0025] See attached Figure 1-4 , a drill bit utilizing energy-gathering attack to unload bottomhole stress, the drill bit includes a drill bit body, an energy-gathering spring 4 and an advantage attack assembly 5; the advantage attack assembly 5 is installed inside the drill bit body, and the advantage attack assembly 5 The energy-gathering attack tooth 6 at the bottom protrudes below the cutting teeth on the bottom surface of the drill bit body; the energy-gathering spring 4 is ins...