Method for perforating a wellbore in low underbalance systems
US9080431B2 · kind B2 · utility
19Cited by
13References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2009 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Feb 28, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
By substantially eliminating the crushed zone surrounding a perforation tunnel and expelling debris created upon activation of a shaped charge with first and second successive explosive events, the need for surge flow associated with underbalanced perforating techniques is eliminated. The break down of the rock fabric at the tunnel tip, caused by the near-instantaneous overpressure generated within the tunnel, further creates substantially debris-free tunnels in conditions of limited or no underbalance as well as in conditions of overbalance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.