Flow splitting device for gas reverse circulation drilling

• Main Authors: Wu, Zhonghua, Su, Zhenguo, Sun, Haoyu, Chen, Yongming, Kang, Bo, Liu, Zhihe, Zhou, Yanjun, Pei, Xueliang, Zhu, Huangang, Zhang, Hui, Chen, Zhongshuai, Zhao, Chuanwei, Tang, Honglin
• Format: Patent
• Language: English
• Published: 02.04.2024
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

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.