Method for plugging subterranean formations with siliceous gels
Patent
·
OSTI ID:7017568
This patent describes a process for selectively plugging a permeably zone in a subterranean formation. It comprises injecting into the zone a high pH aqueous solution of colloidal silica or alkali metal silicate and an inorganic fluoride salt which hydrolyzes to form hydrofluoric acid. The inorganic fluoride salt being present in sufficient concentration to reduce the pH of the aqueous solution and effect gelling of the colloidal silica or alkali metal silicate in situ.
- Assignee:
- Conoco, Inc., Ponca City, OK
- Patent Number(s):
- A; US 4901797
- Application Number:
- PPN: US 7-372396A
- OSTI ID:
- 7017568
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADSORBENTS
ALKALI METAL COMPOUNDS
CHEMICAL COMPOSITION
COLLOIDS
DISPERSIONS
GELATION
GELS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OIL WELLS
OXYGEN COMPOUNDS
PERMEABILITY
PLUGGING
PLUGGING AGENTS
SILICA GEL
SILICATES
SILICON COMPOUNDS
WELL COMPLETION
WELLS
020300* -- Petroleum-- Drilling & Production
ADSORBENTS
ALKALI METAL COMPOUNDS
CHEMICAL COMPOSITION
COLLOIDS
DISPERSIONS
GELATION
GELS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OIL WELLS
OXYGEN COMPOUNDS
PERMEABILITY
PLUGGING
PLUGGING AGENTS
SILICA GEL
SILICATES
SILICON COMPOUNDS
WELL COMPLETION
WELLS