Tubing head spool 

1. Tubing head specification

Work pressure:2000-20000psi

Material class: AA -HH

Temperature class: -49°C~121°C(L U class)

Performance class:PR1,PR2

Production class: PSL1~4,

Work medium: petroleum, gas, mud

2. Functions:
1) Hang the tubing string inside well;
2) Seal the annular space between tubing and casing;
3) Give a crossover to connect casing head downwards and to connect x-mass tree upwards;
4) Provide both side outlets in tubing head spool body through which to execute injection and well wash operation.

Tubing head is usually a spool with both flanged ends, which is set on the top flange of casing head to hang tubing hanger and seal the annular space between the tubing string and oil-layer casing and which consists of tubing head spool and tubing hanger. The tubing head is accordance with API 6A.There are tubing head with single tube(TH) and tubing head with dual tube(THD).