Preload and centralizing device for milling subterranean barrier valves
US9051799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2012 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | May 22, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A device is associated with a downhole tool to control the weight that can be set down on the tool while the tool is operating. A shroud is secured to the string that supports the tool with interior modular biasing components that for run in extend the tool past the shroud. Upon encountering a support for the tool, further set down weight compresses the biasing components for a predetermined stroke length delineated by the shroud landing on a support. If the tool is a mill, its operation takes place under the biasing force as the mill advances into the piece being cut or milled under a predetermined pressure. When the mill reaches full extension from the shroud the process can be repeated until the milling is complete. The shroud also centralizes the mill during milling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.