FORMATION OF CROSS-LINKING IN THE SWELLABLE POLYMER WITH PEI Russian patent published in 2017 - IPC C08C19/22 C09K8/588 E21B43/16 

FIELD: chemistry.

SUBSTANCE: composition contains polymer particles expand, capable of containing polymers based on acrylamide, cross stitched using unsustainable cross-linking agents and stable cross-linking agents. These polymers have the ability to reamidation reaction. Particles are mixed with liquid and not reacted with a tertiary crosslinking agent that contains the polyethylenimine PEA ("PEI"). Tertiary crosslinker has the ability to continue sew these particles covalently through reamidation reaction at a temperature of 150-190°F after the destruction of the unsteady crosslinking agent with the formation of a stable gel.

EFFECT: invention allows to receive stable gels, stable and less susceptible to fluid loss or resistant to leaching of subsequent download liquid.

17 cl, 6 dwg, 1 tbl, 8 ex