Invention Grant
- Patent Title: Process for drilling natural gas hydrates with submersible core drilling rig using pressure wireline
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Application No.: US16731068Application Date: 2019-12-31
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Publication No.: US10704350B2Publication Date: 2020-07-07
- Inventor: Buyan Wan , Yongping Jin , Xiaojun Huang , Jialiang Wang
- Applicant: Hunan University of Science and Technology
- Applicant Address: CN Xiangtan
- Assignee: Hunan University of Science and Technology
- Current Assignee: Hunan University of Science and Technology
- Current Assignee Address: CN Xiangtan
- Agency: Wayne & Ken, LLC
- Agent Tony Hom
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@6a648d08
- Main IPC: E21B25/06
- 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.
Public/Granted literature
- US20200131875A1 PROCESS FOR DRILLING NATURAL GAS HYDRATES WITH SUBMERSIBLE CORE DRILLING RIG USING PRESSURE WIRELINE Public/Granted day:2020-04-30
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