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|1. (WO2018108186) AUTHIGENIC ACID-INDUCED TACKIFYING CONTROL SYSTEM HAVING OIL WASHING FUNCTION AND PREPARATION METHOD THEREFOR|
|Applicants:||CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
|Title:||AUTHIGENIC ACID-INDUCED TACKIFYING CONTROL SYSTEM HAVING OIL WASHING FUNCTION AND PREPARATION METHOD THEREFOR|
The present invention relates to the field of oilfield chemistry, and specifically to an authigenic acid-induced tackifying control system having an oil washing function for a medium/low temperature reservoir and method therefor. The authigenic acid-induced tackifying control system comprises an anionic polymer, a sodium alkyl sulfate surfactant, methyl propanediamine, a retarded acid, an enhancer, and fluid preparation water. The percentages by mass of the components are as follows: anionic polymer: 0.1-0.2%; sodium alkyl sulfate surfactant: 0.5-1.5%; methyl propanediamine: 0.3-0.8%; retarded acid: 1.0-3.5%; enhancer: 1.0-3.0%; the balance being fluid preparation water and the sum of the percentages by mass of the components being 100%. The present invention has the following beneficial effects: significantly improving the oil washing efficiency of an oil displacement agent; implementing the dual function of controlling deep reservoir ground and improving the swept volume of the oil displacement agent after viscosity increment; and overcoming the defect that a conventional control system is single in function, quick in viscosity increment, or poor in environmental protection, and thus cannot implement deep injection.