Invention Grant
- Patent Title: Differential shifting tool and method of shifting
- Patent Title (中): 差速换档工具及换档方法
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Application No.: US12844160Application Date: 2010-07-27
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Publication No.: US08371389B2Publication Date: 2013-02-12
- Inventor: Raymond Hofman , Steve Jackson
- Applicant: Raymond Hofman , Steve Jackson
- Applicant Address: US TX Midland
- Assignee: Summit Downhole Dynamics, Ltd
- Current Assignee: Summit Downhole Dynamics, Ltd
- Current Assignee Address: US TX Midland
- Main IPC: E21B23/00
- IPC: E21B23/00 ; E21B23/04

Abstract:
A shifting tool and method of shifting a downhole device that requires only a minimal profile or no profile to engage and move the movable portion of the tool. The invention comprises a ported housing assembly and at least one friction pad alignable with said at least one port and radially movable through the port between a first pad position and a second pad position. In the second pad position, the friction pad extends outside said outer diameter of said housing assembly to engage the targeted downhole device. A mandrel positioned through the ported housing has a first section with a first outer diameter and a second section with a second outer diameter, said second outer diameter being greater than said first outer diameter. The mandrel is movable between a first mandrel position and a second mandrel position. In the second mandrel position, the second outer diameter supports the friction pads in the second pad position.
Public/Granted literature
- US20110226489A1 Differential Shifting Tool and Method of Shifting Public/Granted day:2011-09-22
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