公开(公告)号：US20230272696A1

公开(公告)日：2023-08-31

申请号：US18114300

申请日：2023-02-27

Applicant: Shandong University of Science and Technology

Inventor： Bin GONG ,  Yujing JIANG

IPC: E21B41/00 ,  E21B7/04 ,  E21B33/13 ,  E21B49/00 ,  E21B33/12

CPC classification number: E21B41/0099 ,  E21B7/046 ,  E21B33/13 ,  E21B49/00 ,  E21B33/12

Abstract: Disclosed is a method for deep-sea extraction of natural gas hydrates with reservoir top control and sand prevention, belonging to the technical field of natural gas hydrates mining. A grouting layer is constructed between a natural gas hydrates reservoir layer and an upper overburden layer by adopting a multi-branch horizontal well process, a vertical shaft is drilled further into the natural gas hydrates reservoir layer after the grouting layer is stabilized, and a mining device and a bottom plugging device are installed in the vertical shaft according to a thickness of the reservoir.