Method for reducing the permeability of underground strata...

Details Method for reducing the permeability of underground strata... Method for reducing the permeability of underground strata...

E - Fixed Constructions

21

B

166/31

E21B 43/28 (2006.01)

Patent

CA 1187404

Abstract of the Disclosure The invention provides a method for the secondary recovery of oil from an oil- bearing stratum having a zone of high fluid permeability, in which this zone is plugged by introducing into the stratum a gelable solution comprising an alkaline material, a polyphenolic vegetable material such as mimosa tannin extract and formaldehyde, the last compound being present as free formaldehyde para- formaldehyde or a phenol-formaldehyde resole. The gelable solution has a pH of at least 9.5 and may optionally include a viscosifier. The gelable solutions are relatively insensitive to brines or temperature and gel to produce mechanically strong gels, even in the presence of oil-wet minerals. If desired, the alkaline material can be an alkali metal carbonate, and the use of such carbonates permits the permeability of the plugged high permeability zone to be adjusted after formation of the gel by treating the gel with acid.

398179

Affiliated with

Also associated with

Rating

Method for reducing the permeability of underground strata... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for reducing the permeability of underground strata..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reducing the permeability of underground strata... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1335523