发明名称 Well sealing apparatus and method
摘要 A well sealing apparatus, and method of use, which seals between tubular goods and a well casing without the use of a sealing tool run separately. The apparatus has a resilient skirt which is sealed against the well casing by split rings which are released from containment by the assembly as the assembly is released from the drill pipe.
申请公布号 US4930577(A) 申请公布日期 1990.06.05
申请号 US19890348207 申请日期 1989.05.05
申请人 GRANTOM, CHARLES 发明人 GRANTOM, CHARLES
分类号 E21B33/12;E21B33/127;E21B43/10 主分类号 E21B33/12
代理机构 代理人
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