A high-strength coring tool and coring method for deep shale broken formation

By designing high-strength coring tools with support components, coring components, deceleration control components, and core fixing components, the problem of core fragmentation during shale sampling was solved, achieving protection of the core and stable drilling, and reducing the risk of breakage.

CN122280480APending Publication Date: 2026-06-26PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2024-12-17
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing core sampling devices are prone to fragmentation when sampling shale, especially when the pressure and rotation speed are too high during drilling, which can cause greater impact on the core and lead to breakage.

Method used

A high-strength coring tool was designed, comprising a support component, a coring component, a deceleration control component, and a core fixing component. The support component drives the coring component to move vertically in a straight line. The deceleration control component automatically decelerates when the pressure is too high. The core fixing component protects and fixes the core, reducing mechanical vibration and friction.

Benefits of technology

It effectively reduces the risk of core breakage during drilling, ensures the stability and success rate of core sampling operations, reduces mechanical vibration and friction of the core, and prevents the core from breaking during drilling.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of rock core sampling technology, and specifically relates to a high-strength coring tool and method for deep shale fragmented strata. A high-strength coring tool for deep shale fragmented strata includes a support assembly, a drive unit fixedly connected to the side of the support assembly, a deceleration control assembly located below the drive unit, a coring assembly fixedly mounted on the drive unit, and a core fixing assembly inside the coring assembly. The support assembly drives the drive unit and the coring assembly to move vertically in a straight line. The deceleration control assembly automatically reduces speed when drilling due to excessive pressure. The core fixing assembly protects and fixes the core. This invention reduces the mechanical vibration and friction experienced by the core during drilling by using the coring assembly, thereby effectively reducing the risk of core breakage. The core fixing assembly effectively protects and fixes the core, solving the problem that the excessively high rotation speed of existing core sampling equipment can easily cause greater impact and breakage to the core.
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