Flow splitting device for gas reverse circulation drilling

US11946334B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• SINOPEC PETROLEUM ENGINEERING TECHNOLOGY SERVICE CO., LTD · CN
• SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD · CN
• DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD · CN

Inventors

• Chuanwei Zhao · Dongying, CN
• Zhonghua WU · Dongying, CN
• Yanjun Zhou · Dongying, CN
• Honglin Tang · Dongying, CN
• Zhihe LIU · Dongying, CN
• Xueliang PEI · Dongying, CN
• Haoyu Sun · Dongying, CN
• Zhenguo Su · Dongying, CN
• Bo-Kyeong Kang · Dongying, CN
• Hui Zhang · Tangxia, CN
• Huangang Zhu · Shandong, CN
• Yongming Chen · Dongying, CN
• Zhongshuai CHEN · Dongying, CN

Key dates

• Filing date: Sep 30, 2020
• Grant date: Apr 2, 2024
• Expiry date: Oct 2, 2040

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B21/16
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A flow splitting device for gas reverse circulation drilling, including: an upper joint for connecting with a double-wall drill pipe; an inner tube which is arranged in the upper joint and defines a first passageway in communication with an inner chamber of the double-wall drill pipe, a second passageway in communication with an annular space in the double-wall drill pipe formed between the inner tube and the upper joint; a lower joint, having an upper end fixedly connected with the upper joint and a lower end for connecting with a drill tool; and a flow guiding member provided between the upper joint and the lower joint. A flexible sealing mechanism is provided outside the upper joint. The flexible sealing mechanism extends radially outward relative to the upper joint and the lower joint to form a sealing contact with a wellbore wall.