Acidizing method for gravel packing wells
US5209296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1992 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for producing substantially sand or fines free hydrocarbonaceous fluids from a wellbore which is initially gravel packed. Thereafter, an acid is directed into the wellbore so as to dissolve formation fines in channels contained in perforations communicating with a productive interval of the formation. The acid is of a strength sufficient to dissolve said fines. After the fines are dissolved, a sand consolidation agent is introduced into the perforations before the channels can be filled with formation fines. The consolidation agent remains in the perforations for a time sufficient to form a cement in situ which cement has permeability retentive characteristics. The cement forms pores of a size sufficient to exclude formation fines from the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.