Tubing Head
Assembly are installed on the upper end of the casing head, which consist of
tubing head spool, tubing hanger and seals. Tubing hanger are used to support a
tubing string in a tubing head, seal off the annual space between the tubing
string and production casing. Tubing head spool are used to positive and
reverse circulation well clean-up, observe casing pressure and carry out work
through the annual space between the tubing string and casing string.