Acidizing method for gravel packing wells
US5219026A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Dec 19, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for gravel packing perforations in a wellbore where an acid is directed into the perforations so as to dissolve formation fines in channels contained in said perforations. The acid is of a strength sufficient to dissolve said fines. After the fines are dissolved, a three slug sand consolidating agent is introduced into the perforations before the channels can be filled with formation fines. The consolidating agent remains in the perforations for a time sufficient to form a silicate cement in situ which cement has permeability retentive characteristics. The cement forms pores of a size sufficient to exclude formation fines from the wellbore. Thereafter, the wellbore is packed with gravel to remove any escaping fines from hydrocarbonaceous fluids produced to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.