System for producing high density, extra large well perforations
US5797464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | May 1, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/117
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shaped charge and liner having a minimum outside diameter determined by the formula: EQU D.sub.L =2.625-0.3571(6 -D.sub.ID) Where: PA1 D.sub.L =Liner Minimum Outside Diameter PA1 D.sub.ID =Carrier Inside Diameter The geometry of the shaped charge reduces the chances of interference between charges by controlling burn time, as does the positioning of the primer cord. The liner has an open end with a minimum outside diameter determined by the formula. The shape of the case and liner is determined by keeping the center of the primer cord a distance not greater than 0.10 (D.sub.ID) from the center line of the carrier, ideally not greater than 0.05 (D.sub.ID). This yields a large diameter, flat shaped charge that may be loaded in a tubular carrier having a charge or perforation density of at least 10 shots per foot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.