Title:
CONSECUTIVE DRILLING SYSTEM
Document Type and Number:
Japanese Patent JP2019124030
Kind Code:
A
Abstract:
To provide a consecutive drilling system capable of detaching a drilling hole casing from a mounting cylinder without rotating the drill string, preventing a cable near a drill string from being wound up together even in a deep sea.SOLUTION: A lock plug 7A is inserted in a plug installation position of an insertion hole 5a of a tool stem 5 connected to a drill string 10. A stopper 62 engages a drill hole casing 4 by protruding outward in a radial direction from a mounting cylinder 6 when fluid flows in the insertion hole 5a. Then, an internal stopper 66 engages the tool stem 5 to lock by protruding inward in the radial direction from the mounting cylinder 6. An unlock plug is inserted in the plug installation position of the insertion hole 5a, releasing the stopper 62 from the drill hole casing 4 and releasing the internal stopper 66 from the tool stem 5 to release the lock when flowing the fluid in the insertion hole 5a.SELECTED DRAWING: Figure 4
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Inventors:
SARUHASHI TOMOKAZU
SAWADA IKUO
KYO MASANORI
YOKOYAMA TAKAHIRO
SAKURAI AKIRA
WEE RYAN BO JIA
CHAMAL JAYANATH SENEVIRATNE
GOI KIM KOK
TEO SIM GUAN
SAWADA IKUO
KYO MASANORI
YOKOYAMA TAKAHIRO
SAKURAI AKIRA
WEE RYAN BO JIA
CHAMAL JAYANATH SENEVIRATNE
GOI KIM KOK
TEO SIM GUAN
Application Number:
JP2018004546A
Publication Date:
July 25, 2019
Filing Date:
January 15, 2018
Export Citation:
Assignee:
JAPAN AGENCY FOR MARINE EARTH SCIENCE & TECH
NUSTAR TECH PTE LTD
NUSTAR TECH PTE LTD
International Classes:
E21B43/10
Attorney, Agent or Firm:
Sumio Tanai
Shu Oikawa
Shunsuke Fushimi
Shu Oikawa
Shunsuke Fushimi