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Bone Structure01:55

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.

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Experimental study on new structure teeth in a high-temperature environment.

Dongdong Song1, Yingxin Yang2, Zhangping Ren1

  • 1CNPC Chuanqing Drilling Engineering Co. Ltd, Chuanxi Drilling Company, Chengdu, Sichuan, China.

Science Progress
|February 16, 2024
PubMed
Summary

A novel tapered tooth structure significantly enhances cone bit performance in high-temperature geothermal drilling. This design improves tooth retention strength, addressing severe tooth loss and extending bit service life in demanding conditions.

Keywords:
High temperature geothermalfastening forcelaboratory experimenttaper structuretooth fixing strength

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Area of Science:

  • Geological Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • Cone bits in high-temperature geothermal drilling suffer severe tooth loss, reducing service life and efficiency.
  • Conventional tooth-fixing methods are inadequate for high-temperature environments.
  • Improved tooth retention is critical for cone bit performance in extreme conditions.

Purpose of the Study:

  • To propose and evaluate a novel tapered tooth structure for enhanced cone bit performance.
  • To investigate the tooth-fixing strength of tapered structures at various temperatures and interference levels.
  • To address the critical issue of tooth loss in high-temperature drilling applications.

Main Methods:

  • Laboratory experiments were conducted to test tapered teeth with varying degrees of taper.
  • Fastening forces were measured at both normal and high temperatures (up to 300°C).
  • Comparative analysis was performed against conventional cylindrical teeth under identical conditions.

Main Results:

  • Maximum fastening force increased with taper degree, peaking at C50.
  • Tapered teeth showed an 88.6%-271.1% increase in fastening force compared to cylindrical teeth.
  • Despite a decrease at 300°C, tapered structures consistently demonstrated superior tooth retention strength.

Conclusions:

  • The proposed tapered tooth structure significantly enhances tooth-fixing and retention strength.
  • This innovative design offers a viable solution to tooth loss in high-temperature drilling.
  • The findings support the adoption of tapered structures for improved cone bit durability and efficiency.