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.

公开(公告)号：US11041344B1

公开(公告)日：2021-06-22

申请号：US16988702

申请日：2020-08-09

Applicant: Hunan University of Science and Technology

Inventor： Buyan Wan ,  Yongping Jin ,  Xiaojun Huang

IPC: E21B7/12 ,  E21B19/00 ,  E21B25/18 ,  E21B21/00 ,  E21B15/02

Abstract: There is provided a wireline coring recovery system of a seafloor drilling rig, including: a winch, a rope, a submersible tension sensor, a cover, a main shaft and a catcher. One end of the rope is wound on the winch, and the other end of the rope is connected to an upper end of the catcher after the rope passes over a first pulley provided below the submersible tension sensor and then through a tapered hole on the cover. The catcher is provided in a center hole of the main shaft. The present application further provides a method of using the wireline coring recovery system. By the cooperation of the compression rod skewed teeth, the first rotating core skewed teeth, the second rotating core skewed teeth and the compression spring, the inner core barrel is readily recovered or released.

公开(公告)号：US10947800B2

公开(公告)日：2021-03-16

申请号：US16833584

申请日：2020-03-28

Applicant: Hunan University of Science and Technology

Inventor： Buyan Wan ,  Xiaojun Huang ,  Yongping Jin

IPC: E21B25/18 ,  E21B49/02 ,  E21B25/04

Abstract: The present disclosure discloses a pressure-retaining cap screwing and unscrewing device for a marine natural gas hydrate pressure-retaining rock-core barrel, wherein it comprises a cap-unscrewing chuck, a support cylinder, a pressure-retaining cap screwing and unscrewing head, a spring, a screwing and unscrewing shaft, and a pressure-retaining cap screwing and unscrewing sleeve, a reducer and a motor; an input shaft of the reducer is connected to the motor, an output shaft of the reducer is the screwing and unscrewing shaft which is a tubular structure with a plurality of guide holes provided on a side wall thereof. The device is simple in structure, compact, light in weight, and convenient to control, and the pressure-retaining cap can be discarded.

公开(公告)号：US11371298B2

公开(公告)日：2022-06-28

申请号：US16876737

申请日：2020-05-18

Applicant: Hunan University of Science and Technology

Inventor： Buyan Wan ,  Yongping Jin ,  Deshun Liu ,  Xiaojun Huang

IPC: E21B19/14

Abstract: A support device for the rotation of a high-capacity and compact drill pipe storage unit of a seabed drilling rig in a lying state, including: a rack, a plurality of curved support frames, a plurality of lateral drill pipe stoppers and a plurality of annular fences. The curved support frames are provided parallelly and coaxially on a slideway of the rack. A separating plate is provided on each of the curved support frames. A curved support surface of each of the curved support frames is in contact with a circular edge surface of the corresponding separating plate. The annular fences are mounted on the rack. Each of the annular fences is provided with a first gap and a second gap. The first gap is provided corresponding to the lateral drill pipe stopper. The second gap is configured to allow the drill pipes enter and exit the drill pipe storage unit.

公开(公告)号：US10704350B2

公开(公告)日：2020-07-07

申请号：US16731068

申请日：2019-12-31

Applicant: Hunan University of Science and Technology

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

IPC: E21B25/06 ,  E21B25/18 ,  E21B10/02 ,  E21B19/14

Abstract: A process for drilling natural gas hydrates. A drilling rig is placed in seawater. A suction-press core drilling mode is adopted in a soft sediment formation, a suction-rotary core drilling mode is adopted in a medium-hard sediment formation, or a pumping direction circle-rotary core drilling mode is adopted in a hard sediment formation. A core is extracted. An inner tube for wireline pressure coring is recovered. A holding seal cap is tightened, and the inner tube is stored in a pipe storage rack. Punching is carried out. An inner tube for wireline pressure coring which is hollow is captured to disengage the holding seal cap. The inner tube is lowered. A drill rod is added. The punching is carried out again. The above steps are repeated until the core drilling reaches a given drilling depth. The drill rod, the drill and the corer are recovered.