Core barrel sealing structure capable of increasing sealing-specific pressure

US11761283B2 · kind B2 · utility

Assignees

• SHENZHEN UNIVERSITY · CN
• Sichuan University · CN

Inventors

• Heping Xie · Sichuan, CN
• Ling Chen · Lo Wu, CN
• Mingzhong Gao · Longbeilingcun, CN
• Jun Guo · Sichuan, CN
• Zhilong Zhang · Chengdu, CN
• Zetian Zhang · Chengdu, CN
• Yiqiang Lu · Sichuan, CN
• Cong Li · Longbeilingcun, CN
• Zhiqiang He · Nanhu, CN

Key dates

• Filing date: Nov 12, 2018
• Grant date: Sep 19, 2023
• Expiry date: Sep 21, 2039

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B25/12
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A core barrel sealing structure includes a core barrel, a drilling machine outer barrel, a chain mail-type flap valve and a trigger mechanism. The flap valve includes a valve seat and a chain mail-type valve flap. The trigger mechanism includes a trigger inner barrel and a trigger block. The trigger block is arranged in a through hole in a sidewall of the trigger inner barrel, and an inner wall of the drilling machine outer barrel is provided with a recessed opening adapted to the trigger block. When the core barrel is located in the valve seat, the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel. When the core barrel is lifted upwards, the valve flap returns to a top face of the valve seat to make sealing contact with a sealing face of a valve opening.