Mill and method for drilling composite bridge plugs
US8127851B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2008 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | May 24, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system used to remove multiple isolation plugs from a wellbore. The system is efficient in fluidizing and circulating proppant located below an upper plug resting on top of proppant settled above a lower plug. The system uses a central port of the mill that is in communication with coiled tubing to fluidize and circulate the proppant around the perimeter of the upper plug. Once the proppant has been circulated from underneath the upper plug, the upper plug may mate and rotationally lock with a lower plug set within the wellbore. Upon locking, the system is able to rapidly mill out the upper plug and the lower plug until the lower plug is no longer set within the wellbore. The system provides for the rapid removal of multiple plugs positioned within a wellbore where an amount of proppant is present between the plugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.