AGGLOMERATING POLYMER COMPOSITIONS, MODIFIED SOLID MATERIALS AND METHODS FOR PRODUCTION AND USE THEREOF Russian patent published in 2020 - IPC C09K8/35 C09K8/575 C09K8/80 E21B43/22 E21B43/267 

FIELD: drilling of wells; technological processes.

SUBSTANCE: invention relates to aggregating compositions for treatment of underground formation and borehole fluids. Method for changing characteristics of self-aggregation and/or aggregation ability of particles, surfaces and/or materials for downhole application involves bringing particles, surfaces and/or materials into contact with an aggregating composition containing chitosans, polypeptides containing at least one amino acid selected from a group, consisting of lysine, tryptophan, histidine, arginine, asparagine, glutamine and mixtures and combinations thereof, protein-containing gelatines and mixtures or combinations thereof, wherein said composition forms a partial, substantially continuous and/or continuous coating on said particles, surfaces and/or materials, changing their characteristics of self-aggregation and/or aggregation ability. Method of controlling sand formation or ingress of fine particles into well includes pumping fluid into formation with certain rate and defined pressure to control sand formation and ingress of fine particles into produced fluids, wherein said liquid contains said aggregating composition, where composition forms a partial, substantially continuous and/or solid coating on particles, surfaces and/or materials, changing their characteristics of self-aggregation and/or ability to aggregation. Method for controlling sand formation or ingress of fine particles into a well includes depositing a solid dispersed material with a coating treated with said aggregating composition, where said aggregating composition forms a partial, substantially continuous and/or continuous coating on particles, surfaces and/or materials, changing their self-aggregation characteristics and/or aggregation ability near the mesh type devices to prevent the sand and fine particles from entering the well, so that sand and/or fine particles are attracted to said particles with coating and do not get on screen of mesh type device or do not clog it. Composition for borehole application contains a dispersed material having a surface with a partial or continuous coating applied thereto, wherein said coating contains said aggregating composition, with change of self-aggregation characteristic and/or ability to aggregation. Substrate comprises surfaces partially or completely coated with a coating containing said aggregating composition, where the composition forms a partial, substantially continuous and/or continuous coating on particles, surfaces and/or materials, changing their self-aggregation characteristics and/or aggregation ability, wherein said coating is deformable.

EFFECT: technical result is intensification of aggregating or agglomerating properties of particles and/or surfaces.

15 cl, 2 tbl, 36 ex