SEDIMENT CORE-BORING DRILLING PROCESS SUITABLE FOR SUBMARINE ROPE CORE-BORING DRILL

Title:

SEDIMENT CORE-BORING DRILLING PROCESS SUITABLE FOR SUBMARINE ROPE CORE-BORING DRILL

Document Type and Number:

WIPO Patent Application WO/2020/034661

Kind Code:

A1

Abstract:

Disclosed is a sediment core-boring drilling process suitable for a submarine rope core-boring drill, which comprises the following steps: 1) drilling down; 2) pure press-in suction core-boring drilling; 3) single-action rotary press-in suction core-boring drilling; 4) coring; 5) salvaging a core inner tube; 6) sweeping a hole; 7) punching before adding a rod; 8) placing the core tube down; 9) adding and connecting a drill rod; 10) punching after adding the rod; 11) repeating steps 2)-10) until the core is drilled to a given hole depth; 12) recovering the drill rod and a rope core-boring outer pipe drilling tool; and 13) recovering a submarine rope core-boring drill. The described drilling process is suitable for drilling and core-boring conditions of seabed sediment mud-free lubrication and wall protection. Moreover, the process has the advantages of low disturbance and a high core-boring rate, which may be better applicable for remote-controlled operation modes.

Inventors:

WAN BUYAN (CN)
JIN YONGPING (CN)
HUANG XIAOJUN (CN)
WANG JIALIANG (CN)

Application Number:

PCT/CN2019/084697

Publication Date:

February 20, 2020

Filing Date:

April 27, 2019

Export Citation:

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Assignee:

UNIV HUNAN SCIENCE & TECHNOLOGY (CN)

International Classes:

E21B25/18

Foreign References:

CN109025880A	2018-12-18
CN105239947A	2016-01-13
CN105604514A	2016-05-25
CN102606074A	2012-07-25
CN205577920U	2016-09-14
US20140158434A1	2014-06-12
SU1571212A1	1990-06-15

Other References: