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Patent Searching and Data


Title:
CONTINUOUS DRILLING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/139166
Kind Code:
A1
Abstract:
A lock plug (7A) is inserted into a plug installation location of an insertion hole (5a) in a tool stem (5) connected to a drill string (10). When fluid is introduced into the insertion hole (5a), a locked state is achieved as the result of a stopper (62) projecting radially outward from a mounting pipe (6) and locking onto a hole casing (4), and an internal stopper (66) projecting radially inward from the mounting pipe (6) and locking onto the tool stem (5). An unlock plug is inserted into the plug installation location of the insertion hole (5a). When fluid is introduced inside the insertion hole (5a), the locked state is released as the result of the stopper (62) being separated from the hole casing (4) and the internal stopper (66) being separated from the tool stem (5).

Inventors:
SARUHASHI TOMOKAZU (JP)
SAWADA IKUO (JP)
KYO MASANORI (JP)
YOKOYAMA TAKAHIRO (JP)
SAKURAI NORIAKI (JP)
WEE RYAN BO JIA (SG)
SENEVIRATNE CHAMAL JAYANATH (SG)
GOI KIM KOK (SG)
TEO SIM GUAN (SG)
Application Number:
PCT/JP2019/000920
Publication Date:
July 18, 2019
Filing Date:
January 15, 2019
Export Citation:
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Assignee:
JAPAN AGENCY MARINE EARTH SCI (JP)
NUSTAR TECH PTE LTD (SG)
International Classes:
E21B43/10; E21B23/00; E21B33/03
Foreign References:
US3837684A1974-09-24
US3468559A1969-09-23
US3404736A1968-10-08
US5259459A1993-11-09
US20100007089A12010-01-14
US20120305269A12012-12-06
JPS5697014A1981-08-05
JPS496962B11974-02-18
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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