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

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

Example Embodiment

[0040] Basic Example 1:

[0041] like figure 1 As shown in the figure, an omnidirectional variable angle PDC drill bit of the present invention that slows down the impact force of rock breaking is composed of omnidirectional variable angle teeth 1, non-variable angle teeth 2, blade 3 and base 4; the omnidirectional variable angle teeth 1 and the non-variable angle tooth 2 are welded, inlaid, bonded or screwed in the tooth slot 31 of the blade 3; the installation number of the omnidirectional variable angle tooth 1 is greater than or equal to one, and the 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 teeth, conical teeth, spherical teeth and space curved teeth.

[0043] like figure 2 As shown, the omnidirectional variable angle tooth 1 is composed of a cutting element 11, a support 12, an omnidir...

Example Embodiment

[0055] Example 2: Assembly of the omnidirectional variable angle tooth 1

[0056] The present invention is an omnidirectional variable angle PDC drill bit for reducing the impact force of rock breaking. The assembly process of the omnidirectional variable angle tooth 1 is as follows: firstly, the ball set 18 is placed on the inner curved surface 163 of the ball support seat 16, and then the elastic buffering 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 piece 12 is placed on the elastic buffer ring 19, and the two half stop rings 14 are buckled respectively On the outer side of the ball support seat 16, a packaging box 17 is finally fitted, and the cutting tooth is locked by the conical pin 15, and the formed omnidirectional variable angle tooth 1 is as shown in Fig. Figure 9 (a).

Example Embodiment

[0057] Example 3: The working principle of the omnidirectional variable angle PDC bit

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

[0059] ① Omnidirectional variable angle: A rolling pair is formed between the omnidirectional rotating ball 13 built in the omnidirectional variable angle tooth 1 on the drill bit and the ball support seat 16, so that the full rotation between the omnidirectional rotation ball 13 and the ball support seat 16 is realized. The direction of rotation enables the cutting element 11 to be adjusted in space with variable angle;

[0060] ② Mitigation of impact force: In medium-soft strata, the rake angle and side rotation angle of the omnidirectional variable angle tooth 1 will not change or change very...

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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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