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Title:
PLUG, DOWNHOLE TOOL, AND WELL TREATING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/075484
Kind Code:
A1
Abstract:
Provided is a plug that can hold a filling for a predetermined period of time even in water or a fluid having a low salt concentration and a high temperature. This plug (5) for temporarily obstructing circulation of a fluid inside a well is provided with a resin molded article formed from a polyglycolic acid resin composition which contains a polyglycolic acid and a cyclic carbodiimide compound and in which the concentration of carbodiimide groups is not less than 15 eq/t. Alternatively, the plug (5) is formed from said resin molded article.

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Inventors:
KOBAYASHI TAKUMA (JP)
Application Number:
PCT/JP2021/037498
Publication Date:
April 14, 2022
Filing Date:
October 11, 2021
Export Citation:
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Assignee:
KUREHA CORP (JP)
International Classes:
C08K5/29; C08L67/04; C08L101/16; E21B43/00
Domestic Patent References:
WO2013183363A12013-12-12
WO2015072317A12015-05-21
WO2011152199A12011-12-08
WO2013183363A12013-12-12
WO2015199647A12015-12-30
Foreign References:
JP2017200985A2017-11-09
JP2015160872A2015-09-07
US20170342306A12017-11-30
US20170342306A12017-11-30
JP2015160872A2015-09-07
Other References:
See also references of EP 4227355A4
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
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