Dual-type plug for wellhead

申请公布号：US7654329(B2)

申请号：US20040557435

申请日期：2004.05.19

申请公布日期：2010.02.02

申请人：

FMC KONGSBERG SUBSEA AS

发明人：LINDLAND HANS JOERGEN;FOELKNER STEIN

分类号：E21B29/12;E21B33/035;E21B33/068

主分类号：E21B29/12

摘要：The invention concerns a dual-type plug to be used in a wellhead. The plug has a separate retrievable inner plug (50). Retrieving only the inner plug allows the use of lighter workover equipment than if the whole plug (10) must be pulled.

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