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  • Is there new design for wellhead secondary pack off seal?
    • August 11. 2021

    JST successfully got the authorization of invention patent on a wellhead secondary pack off seal structure in USA by United States Patent and Trademark Office in July, 2021. During the drilling operation and oil and gas testing, the casing head slip hanger is the basic part of wellhead equipment, which is installed at the upper end of casing string to hang casing strings of each layer and seal the...

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