Process for chemically treating reservoir pyrobitumen to improve permeability
US5513707A · kind A · utility
4Cited by
6References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 23, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The process involves a well stimulation treatment of a hydrocarbon reservoir containing solid pyrobitumen. A strong oxidant, preferably sodium hypochlorite, is injected into the reservoir as an aqueous solution containing 5 wt. % or higher concentration of the oxidant. The oxidant is retained in contact with the formation for a predetermined retention period and the well is then backflowed or pumped to remove oxidation products. The permeability of the reservoir is improved, apparently by conversion of the solid pyrobitumen to removable gaseous and liquid products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.