国家/地区 中国（2）
IPC部 C（2）
IPC大类 C08（2）
IPC小类 C08G（2）
IPC
发明人 LIU J（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

Heat preservation heating rock plate comprises base material rock plate, electrode, heating layer and insulating layer, base material rock plate the heating layer and the insulating layer are connected in turn, and the base rock plate.

LIU J, FAN X, LIU Y