Apparatus and methods for cleaning well perforations
US4793417A · kind A · utility
36Cited by
11References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Aug 19, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system for cleaning perforations in a well bore by surging formation fluid through the perforations. A wireline retrievable well tool is installed in the well bore above the perforations to establish a fluid barrier which will divide the well bore into a first fluid pressure zone and a second fluid pressure zone. The well tool includes a flow path closure device which will suddenly open when the difference in pressure between the first zone and the second zone exceeds a preselected value. The sudden opening of the closure device results in a surge of fluid flow from the downhole formation which cleans the perforations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.