«Proceedings of Gubkin University»

Ways of application of compositions based on hydrolyzed polyacrylonitrile in technologies of enhanced oil recovery and water shut-off operations in wells

UDC: 622.276.76
DOI: 10.33285/2073-9028-2023-3(312)-145-157

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: water shut-off, polyacrylamide, hydrolyzed polyacrylonitrile, viscosity, gel-forming composition, gel structure, sedimentation composition

Annotation:

The main aim of physical and chemical methods of water shut-off operations is to block possible ways of formation water flow to the wellbore by applying special compositions, different in mechanism of action and chemical nature. This study focuses on the possibility of using hydrolyzed polyacrylonitrile as a reagent for water shut-off technologies in wells. Rheological characteristics of polymer solutions were determined by rotary viscometry. The structure of the gels was evaluated according to the Sydansk classifier with the assignment of a letter code. The smallest effective concentration of hydrolyzed polyacrylonitrile in aqueous solution was proposed for application as a gel-forming reagent. It was experimentally proved that the structure of the obtained gels depends on the temperature and the content of crosslinking agent in the composition of the system, the more crosslinking agent in the composition of the system, the stronger the structure of the forming gel. The dependence of the volume of the settling reagent obtained as a result of interaction with mineralized water on the polymer concentration was studied. It was proved that increasing the concentration of hydrolyzed polyacrylonitrile in solution, as well as that of calcium and magnesium ions in mineralized water leads to a larger volume of the obtained gel precipitate and strengthening of the gel structure.

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