▎ 摘　　要

NOVELTY - Modified graphene oxide nanosheet tackifier, which is a small molecule surfactant graft modified graphene oxide nanosheet. The small molecule surfactant is from surfactant whose hydrophilic group is carboxylic acid, carboxylic acid ester, acid anhydride, amide, acid chloride and/or aldehyde. The small molecule surfactant is caproic acid, octanoic acid, decanoic acid, dodecyl acid, myristyl acid, hexadecyl acid, caproic anhydride, caprylic anhydride, sebacic anhydride, dodecyl anhydride, tetradecyl anhydride, cetyl anhydride, caproate, caprylate, decanoate, dodecyl acid ester, tetradecyl ester, hexadecanoic acid ester, hexyl amide, octyl amide, decanamide, dodecyl amide, tetradecyl amide, hexadecyl amide, hexanoyl chloride, octyl chloride, decanoyl chloride, dodecyl acyl chloride, tetradecyl acyl chloride, hexadecyl acyl chloride, hexanal, aldehyde, dodecylic aldehyde, myristyl aldehyde and cetyl aldehyde. USE - The polymer system is useful in high temperature and high salt oil reservoir (claimed). ADVANTAGE - The tackifier: is beneficial to control the interaction between the molecules produced by the polymer; has the viscosity of the polymer system for oil displacement to 1-2.5 times that of the initial oil displacement polymer; improves the viscosity increasing efficiency, which can reduce the amount of the viscosity increasing agent; can improve the oil recovery rate by 10-18%, and is suitable for high temperature and high salt reservoir conditions. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the modified graphene oxide nanosheet tackifier comprising grafting and modifying graphene oxide nanosheets or its dispersion with a small molecule surfactant to obtain the modified graphite oxide alkene nanosheet tackifier, where the reaction temperature of the graft modification is 10-70℃, more preferably 45-65℃ and the reaction time of the graft modification is 2-30 hours; an oil-displacing polymer system comprising an oil-displacing polymer and a tackifier. The tackifier is the modified graphene oxide nanosheet tackifier; and a reservoir oil displacement method comprising injecting the oil displacement polymer system into the reservoir from one of (a) uniformly mixing and injecting the oil displacement polymer and tackifier into the oil reservoir or (b) injecting the oil displacement polymer and tackifier respectively the reservoir and mixing in the injection process.