Hydrochloric Acid → HCID 86739559, compound

Participants

Reaction Steps

100 barrels of urea-formaldehyde-acrylamide polymer slug are prepared by combining 50 barrels of 0.5% acrylamide polymer with 50 barrels of 37% formaldehyde solution at ambient temperature. The acrylamide polymer contains 60% unhydrolyzed acrylamide groups and 40% hydrolyzed acrylamide groups. 3805 kilograms of solid urea is added to the above solution and dissolved by passing the mixture through a series of in-line mixers. The pH of the resulting solution is maintained at 4.0 with the addition of hydrochloric acid. The entire volume of the slug is immediately injected into a hydrocarbon-bearing formation via a well in the same manner and under the same conditions as Example 7. After two days the injected fluid precipitates to form a partial plug of the highly permeable zones.

Provenance & Evidence