One trip multiple string section milling of subterranean tubulars
US8555955B2 · kind B2 · utility
17Cited by
19References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2010 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Jan 13, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Multiple section mills are run in a single trip with an intervening mill preferably a watermelon mill to grind up any cuttings that get past the first mill in a direction toward the second mill below it. The blades of the second mill are held by the innermost tubular until the location of the initial cut is reached at which point the longer arms of the second mill can be extended and its body centralizes due to the flexibility of the connection between the mills.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.