国家/地区 中国（2）
IPC部 B（2）
IPC大类 B29（2） C08（2）
IPC小类 B29D（2）
IPC B29D099/00（2）
发明人 ZHANG Y（2）
公开年
申请年 2021（2）
专利权人

Pod-type degradable temporary plugging ball useful in temporary plugging treatment of oil and gas wells in fracturing system, comprises degradable outer shell (comprising e.g. polymerized product of glycolide, lactide, polybutylene succinate prepolymer) and inner core.

LI H, ZHANG Y, SHANG L, HUANG B, LIU J, WANG Y, YANG X, JIANG Q

Preparing modified graphene fluoroplastic heat exchanger, involves preparing modified graphene fluoroplastic raw materials, fins, seals with graphene coatings required for manufacture of heat exchangers, molding, spraying, drying, packaging.

ZHANG Y, ZHANG C