METHOD OF PRODUCING PROPPANTS WITH COATING Russian patent published in 2016 - IPC C09K8/62 C09K8/80 E21B43/267 

FIELD: technological processes.

SUBSTANCE: invention relates to production of coated proppants, proppants obtainable by such a method, uses thereof and methods using proppants. Method for production of coated proppants comprises (a) mixing a proppant with a polyol component and an isocyanate component, wherein polyol component includes a phenolic resin and optionally other compounds containing a hydroxy group, wherein isocyanate component consists of an isocyanate having at least two isocyanate groups and other compounds containing an isocyanate group, where x isocyanate component parts by weight are used in ratio to 100 parts by weight of polyol component, with value of x from approximately 105 % to approximately 550 % of initial value of isocyanate, (b) curing mixture obtained in step (a) by treatment with a catalyst; and (c) optionally repeating steps (a) and (b) one or more times, wherein mixture obtained in preceding step (b) or proppant isolated therefrom is used as a proppant in step (a), wherein polyol component in step (a) is same as or different from polyol component used in previous step (a), and wherein isocyanate component in step (a) is same as or different from isocyanate component used in previous step (a), where coated proppants includes mixture of coated particles and sets, where amount of sets is not more than 10 % of mixture. Invention also provides methods of using obtained proppant. Invention is developed in subclaims.

EFFECT: high efficiency of processing.

35 cl, 3 dwg, 8 tbl, 8 ex