公开(公告)号：US10927606B2

公开(公告)日：2021-02-23

申请号：US16731060

申请日：2019-12-31

Applicant: Hunan University of Science and Technology

Inventor： Buyan Wan ,  Yongping Jin ,  Xiaojun Huang ,  Jialiang Wang

IPC: E21B7/124 ,  E21B21/00 ,  E21B25/18

Abstract: Disclosed is a sediment core-drilling process for a submarine wire-line coring drill rig, including 1) lowering the drill rig; 2) drilling in a pressure-suction mode; 3) drilling in a rotation-pressure-suction mode; 4) cutting sediment cores; 5) recovering a core inner tube; 6) cleaning bottom of hole; 7) punching before adding a drill pipe; 8) lowering another core inner tube; 9) adding the drill pipe; 10) punching after adding the drill pipe; 11) repeating the steps 2)-10) until a given hole depth is reached; 12) recovering the drill pipe and a wire-line coring outer tube drilling tool; 13) recovering the submarine wire-line coring drill rig. The core-drilling process provided herein is suited to working conditions without mud lubrication and mud protection for hole wall. This invention has advantages of low disturbance and high efficiency in coring and is suitable for remote operation.