Reduced wear position indicating subterranean tool
US8201623B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2009 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Jun 23, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A positioning tool engages a profile with retaining members such as dogs so that a pulling force can be applied for a predetermined time as a signal that the tool is at the proper location. The time delay is a fluid system that drives fluid through a narrow restriction. The restriction is variable to allow unloading of the resistance from the fluid system while the dogs are still adequately supported. As a result the dogs are released from the profile without regional overstressing. A lock can prevent the tool from resetting to limit its use to locating at a single location. The lock holds the hydraulic system in a defeated position so that even if the dogs engage another profile when locked they will immediately exit that profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.