Timing the deposition of an asphalt plugging material from an asphalt-cationic emulsion
Patent
·
OSTI ID:6543698
A mixture of urea and urease provides a timed breaking of a cationic asphalt emulsion when the emulsion is used in plugging a subsurface formation. The composition is especially useful in plugging low temperature formations. The composition is a pH-increasing reactant, the higher pH breaking the emulsion. (11 claims)
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 4002204
- OSTI ID:
- 6543698
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
AMIDES
AMIDINASES
ASPHALTS
BITUMENS
CARBONIC ACID DERIVATIVES
CATIONS
CHARGED PARTICLES
COLLOIDS
DISPERSIONS
EMULSIONS
ENERGY SOURCES
ENZYMES
FOSSIL FUELS
FUELS
HYDROLASES
IONS
NON-PEPTIDE C-N HYDROLASES
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PH VALUE
PLUGGING
TAR
UREA
UREASE
WELLS
020300* -- Petroleum-- Drilling & Production
AMIDES
AMIDINASES
ASPHALTS
BITUMENS
CARBONIC ACID DERIVATIVES
CATIONS
CHARGED PARTICLES
COLLOIDS
DISPERSIONS
EMULSIONS
ENERGY SOURCES
ENZYMES
FOSSIL FUELS
FUELS
HYDROLASES
IONS
NON-PEPTIDE C-N HYDROLASES
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PH VALUE
PLUGGING
TAR
UREA
UREASE
WELLS