WELL ANNULUS PRESSURE CHANGE OPERATED VALVE:PRESSURE CHANGE ON ONE SIDE OF ACTUATING PISTON REDUCED BY FLOATING SHOE SEAL FRICTION,申请号NZ19840208834-传众专利搜索

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发明名称	WELL ANNULUS PRESSURE CHANGE OPERATED VALVE:PRESSURE CHANGE ON ONE SIDE OF ACTUATING PISTON REDUCED BY FLOATING SHOE SEAL FRICTION
摘要
申请公布号	NZ208834(A)	申请公布日期	1986.09.10
申请号	NZ19840208834	申请日期	1984.07.09
申请人	HALLIBURTON CO.	发明人	BECK, H.K.
分类号	E21B34/00;E21B34/10;E21B49/00;(IPC1-7):E21B34/10	主分类号	E21B34/00
代理机构		代理人
主权项
地址

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