Method of clay stabilization in enhanced oil recovery

Details Method of clay stabilization in enhanced oil recovery Method of clay stabilization in enhanced oil recovery

E - Fixed Constructions

21

B

31/22

E21B 43/22 (2006.01) C09K 8/588 (2006.01) C09K 8/60 (2006.01)

Patent

CA 1200371

ABSTRACT A method of preventing permeability damage due to clay swelling, disintegration and migration in subterranean formations producing oil and gas, where such formations are to be the sub- ject of enhanced oil recovery techniques using anionic or caus- tic flood chemicals. Prior to the use of such enhanced oil recovery techniques, a cationic organic polymer capable of stabil- izing clays is introduced into an oil reservoir treatment area followed by introduction of a sufficient amount of a non-anionic aqueous spacer fluid to cause the cationic organic polymer to reorient itself on the reservoir clays in a substantially mono- molecular layer and manner such that it will continue to stabilize the reservoir clays but will not substantially react with the anionic or caustic flood chemicals to form permeability damaging precipitates or to decompose thereby reducing its clay stabiliza- tion effectiveness.

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