公开(公告)号：US20230147453A1

公开(公告)日：2023-05-11

申请号：US17913075

申请日：2020-09-30

申请人： CHINA PETROLEUM & CHEMICAL CORPORATION ,  SINOPEC PETROLEUM ENGINEERING TECHNOLOGY SERVICE CO., LTD ,  SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD ,  DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD

发明人： Chuanwei ZHAO ,  Zhonghua WU ,  Yanjun ZHOU ,  Honglin TANG ,  Zhihe LIU ,  Xueliang PEI ,  Haoyu SUN ,  Zhenguo SU ,  Bo KANG ,  Hui ZHANG ,  Huangang ZHU ,  Yongming CHEN ,  Zhongshuai CHEN

IPC分类号： E21B33/128 ,  E21B21/12 ,  E21B21/16

CPC分类号： E21B33/128 ,  E21B21/12 ,  E21B21/16

摘要： 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.