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US 4,223,732 AGranted
Microemulsions for use as spaces in well cementation
AssigneeSociete National Elf Aquitaine (Production)
InventorsJean Carriay, Jacques de Lautrec
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Abstract
New application of microemulsions as buffers between the slurry and the cement in the cementation of oil wells. The microemulsions contain an amphoteric surfactant selected from the group of alkyl dimethyl betaines.
Claims7
A method for the cementation of oil wells which have been drilled with the use of an oil base slurry which comprises:
- (1) positioning a well casing in the well;
- (2) injecting a microemulsion comprising by weight
- (a) 10-20% of an amphoteric surfactant
- (b) 10-15% of at least one co-surfactant
- (c) 3-45% of a hydrocarbon oil or mixture of hydrocarbon oils, and
- (d) 30-80% of water to a height of at least about 100 meters in the annular space between the well casing and the side of the well, ahead of a cement grout intended for cementation of the well.
3 more elements
Dependencies are inferred from the claim text.