Invention Grant
- Patent Title: Dart for downhole device and downhole device
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Application No.: US18006986Application Date: 2021-07-09
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Publication No.: US11767736B2Publication Date: 2023-09-26
- Inventor: Shinya Takahashi
- Applicant: Kureha Corporation
- Applicant Address: JP Tokyo
- Assignee: KUREHA CORPORATION
- Current Assignee: KUREHA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP 20130685 2020.07.31
- International Application: PCT/JP2021/025879 2021.07.09
- International Announcement: WO2022/024711A 2022.02.03
- Date entered country: 2023-01-26
- Main IPC: E21B34/14
- IPC: E21B34/14 ; E21B29/00 ; E21B43/14 ; E21B43/26
Abstract:
In a dart for a downhole device according to the present invention, a ball is formed of a first degradable material having a first degradation rate, a mandrel is formed of a second degradable material having a second degradation rate lower than the first degradation rate, and a sleeve is formed of the second degradable material or a third degradable material having a third degradation rate lower than the second degradation rate.
Public/Granted literature
- US20230212926A1 DART FOR DOWNHOLE DEVICE AND DOWNHOLE DEVICE Public/Granted day:2023-07-06
Information query
