Title:
Rubber members for downhole tools, downhole tools, and methods for recovering hydrocarbon resources
Document Type and Number:
Japanese Patent JP6327933
Kind Code:
B2
Abstract:
A rubber member for downhole tools, preferably a seal member, ball sealer, ball seat, or protecting member, of which a decrease rate of 50% strain compressive stress after immersion for 24 hours in 150°C water relative to 50% strain compressive stress before immersion is not less than 5%, and preferably not less than 50%; a downhole tool comprising the rubber member; and a method for recovering a hydrocarbon resource using the downhole tool.
Inventors:
High Takeo Hashi
Masayuki Okura
Masayuki Okura
Application Number:
JP2014096464A
Publication Date:
May 23, 2018
Filing Date:
May 08, 2014
Export Citation:
Assignee:
Kureha Co., Ltd.
International Classes:
E21B43/16; C08J5/00
Domestic Patent References:
| JP2013014699A | ||||
| JP2011256221A |
Foreign References:
| US20050205266 |
Attorney, Agent or Firm:
Harakenzo world patent & trademark
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