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Omnidirectional angle-shift PDC drill for relieving rock breaking impact force

An impact force and rock-breaking technology, which is applied in the field of omnidirectional variable-angle PDC bits, can solve the problems of PDC bits not available, PDC bit wear, and failure to realize PDC, etc., to achieve flexible cutting posture, low wear rate, good cutting posture and The effect of stress

Active Publication Date: 2019-08-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides an omnidirectional variable-angle PDC drill bit that slows down the rock-breaking impact force, and aims to solve the problem that the elastic buffer structure of the current PDC drill bit cannot realize the adjustment of the forward angle and side rotation angle of the PDC tooth, resulting in that the PDC drill bit does not have formation self-adaptation Angle adjustment function, limited cushioning capacity, which in turn makes PDC bit prone to rapid wear, impact damage and failure

Method used

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  • Omnidirectional angle-shift PDC drill for relieving rock breaking impact force
  • Omnidirectional angle-shift PDC drill for relieving rock breaking impact force
  • Omnidirectional angle-shift PDC drill for relieving rock breaking impact force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the present invention is an omnidirectional variable-angle PDC drill bit for slowing rock-breaking impact force, which is composed of omnidirectional variable-angle teeth 1, non-variable-angle teeth 2, blades 3, and base 4; the omnidirectional variable-angle teeth 1 and non-variable-angle teeth 2 are welded, inlaid, glued or screwed in the tooth groove 31 of blade 3; The number of installations is greater than or equal to zero; the blade 3 and the base 4 are integrally sintered or machined.

[0042] The types of the non-variable-angle teeth 2 include circular teeth, elliptical teeth, wedge-shaped teeth, conical teeth, spherical teeth and space curved teeth.

[0043] Such as figure 2 As shown, the omnidirectional variable-angle tooth 1 is composed of a cutting element 11, a support member 12, an omnidirectional rotating ball 13, a half stop ring 14, a tapered pin 15, a ball support seat 16, a packaging box 17, and a ball assembly 18 It is a...

Embodiment 2

[0055] Embodiment 2: Assembly of omni-directional variable-angle tooth 1

[0056] An omnidirectional variable-angle PDC drill bit of the present invention that slows down the rock-breaking impact force, the assembly process of its omnidirectional variable-angle tooth 1 is: firstly, the ball assembly 18 is placed on the inner curved surface 163 of the ball support seat 16, and then the elastic buffer The ring 19 is placed on the support ring 162 of the ball support seat 16, and then the omnidirectional rotating ball 13 welded with the cutting element 11 and the support member 12 is placed on the elastic buffer ring 19, and the two half stop rings 14 are fastened respectively On the outside of the ball support seat 16, the packaging box 17 is finally put on, and the cutting tooth is locked with a conical pin 15, so that the omnidirectional variable-angle tooth 1 formed is as follows: Figure 9 (a) shown.

Embodiment 3

[0057] Example 3: Working Principle of Omnidirectional Variable Angle PDC Bit

[0058] Such as Figure 9 As shown, the present invention is an omnidirectional variable-angle PDC drill bit that slows down the rock-breaking impact force, and relies on the omnidirectional variable-angle teeth 1 installed on the blade 3 to perform self-adaptive omnidirectional variable-angle adjustment:

[0059] ① Omni-directional variable angle: The omni-directional rotating ball 13 built in the omni-directional variable-angle tooth 1 on the drill bit and the ball support seat 16 form a rolling pair, and then the omni-directional rotating ball 13 and the ball support seat 16 realize a full range of motion. Rotation in the same direction, so that the cutting element 11 can be adjusted in a variable angle in space;

[0060] ② Shock reduction: In medium-soft formations, the forward angle and side angle of the omnidirectional variable-angle tooth 1 will not change or change very little. At this time...

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Abstract

The invention relates to an omnidirectional angle-shift PDC drill for relieving rock breaking impact force, and belongs to the field of drilling engineering equipment. The omnidirectional angle-shiftPDC drill is composed of omnidirectional angle-shift teeth, non-angle-shift teeth, a cutter blade and a substrate; the omnidirectional angle-shift teeth and the non-angle-shift teeth are welded to, embedded in, bonded or connected in a threaded mode in a tooth groove of the cutter blade; the mounting number of the omnidirectional angle-shift teeth is larger than or equal to one; and the cutter blade and the substrate are integrally sintered or formed by mechanically machining. According to the omnidirectional angle-shift PDC drill, the linkage adjustment of the PDC drill tooth front-inclined angle and side corner can be achieved, self-adaptive adjustment can be conducted on the size of the angle according to the formation hardness degree, the abrasion rate of PDC teeth is reduced, meanwhile energy storing and releasing of the PDC tooth cutting edge on any position can be achieved, the impact force on cutting elements is effectively relieved, the service life of the drill is long, and the rate of drilling is high.

Description

[0001] Technical field: [0002] The invention relates to an omnidirectional variable-angle PDC drill bit for slowing rock-breaking impact force, belonging to the field of drilling engineering equipment. [0003] Background technique: [0004] PDC bit is the main drilling equipment in oil and gas exploration and development. More than 85% of oil and gas drilling footage in my country is completed by PDC bit. However, during the rock-breaking process of the PDC bit, due to the reaction force of the rock, the cutting teeth on the PDC bit will suffer from abrasion and impact damage. It affects the bit life and drilling efficiency, which has become the main bottleneck restricting the further development of PDC bit. [0005] In response to the above problems, many scholars have carried out the structural design of PDC bits and teeth that can reduce the impact force. In the utility model patent "a diamond drill bit with flexible cutting structure" (application number: 2001820353452...

Claims

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Application Information

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IPC IPC(8): E21B10/54E21B10/62E21B10/43
CPCE21B10/43E21B10/54E21B10/62
Inventor 马亚超黄志强练章华李琴
Owner SOUTHWEST PETROLEUM UNIV
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