公开(公告)号：US12221849B2

公开(公告)日：2025-02-11

申请号：US17997275

申请日：2021-01-26

Applicant: SICHUAN UNIVERSITY

Inventor： Mingzhong Gao ,  Ling Chen ,  Jianan Li ,  Cong Li ,  Zhiqiang He ,  Le Zhao ,  Mingqing Yang ,  Nianhan Wu ,  Bo Yu

IPC: E21B34/14 ,  E21B33/06 ,  E21B34/12

Abstract: An internal blowout-prevention gas-retaining connector has a body mounted at the bottom of a drill pipe. The body includes a valve pipe section and a connecting pipe section arranged from top to bottom. The bottom of the valve pipe section is inserted into the top of the connecting pipe section. The blowout-prevention valve seat is provided at a bottom end of the valve pipe section while a blowout-prevention valve bonnet is provided on a bottom surface of the valve pipe section. The edge of the blowout-prevention valve bonnet is rotatably connected to a bottom surface edge of the valve pipe section. A torsion spring is provided on a bottom surface of the blowout-prevention valve bonnet. One end of the torsion spring is connected to the bottom surface of the blowout-prevention valve bonnet while the other end is connected to the inner wall of the connecting pipe section.