A valve installed in the wellhead assembly to provide access to the casing annulus of non-producing casings.

安装在井口装置中的一个阀。它提供通向非生产套管的套管环形空间的通路。

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A valve installed in the wellhead assembly to provide access to the casing annulus of non-producing casings.

安装在井口装置中的一个阀。它提供通向非生产套管的套管环形空间的通路。

youdao