Well tubing hanger method and apparatus for use in well control

摘要

A well tubing hanger designed for severe service applications includes an annular seal formed about the tubing hanger exterior that is not energized during normal well operations. The annular seal is energized by lowering the tubing hanger downward within the tubing head until the annular seal subsequently contacts in a fluid-tight manner both the tubing hanger and the tubing head. The tubing hanger is lowered relative to the tubing head by rotative disengagement of a treaded mandrel operatively connected between the tubing hanger and the tubing head. The annular seal is energized prior to installation or removal of well flow control equipment located above the tubing hanger and tubing head, preferably after well fluid flow through the well has been secured.