公开(公告)号：US20230175339A1

公开(公告)日：2023-06-08

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: E21B33/06 ,  E21B34/12

CPC classification number: 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.