公开(公告)号：US20180208831A1

公开(公告)日：2018-07-26

申请号：US15745508

申请日：2016-07-29

Applicant: ADEKA CORPORATION

Inventor： Masatoshi HOMMA ,  Kazuyuki NODA ,  Hirokatsu SHINANO ,  Yoshihiro ISHIKAWA ,  Daisuke SAWAMOTO ,  Kensaku AKIMOTO

IPC: C09K8/70 ,  E21B43/267 ,  C09K8/68

CPC classification number: C09K8/706 ,  C09K8/68 ,  C09K2208/26 ,  E21B43/26 ,  E21B43/267

Abstract: An encapsulated agent includes: a central part 1; and an outer part 2 that covers a surface of the central part 1. The central part 1 contains a viscosity-reducing material that reduces the viscosity of a fluid to be used in a hydrofracturing technique. The outer part 2 enables gradual release of the central part 1 in the fluid, and contains a styrene-butadiene copolymer having glass-transition temperature that is equal to or higher than −20 degrees centigrade and equal to or lower than 80 degrees centigrade.