Patent ID: 7066269

Claim:
A tubing head spool for use on a well completed using an independent screwed wellhead and equipped with a casing mandrel having a casing mandrel top end that includes a pin thread, an axial passage through the casing mandrel and a box thread in a top end of the axial passage, the tubing head spool comprising: a spool sidewall with a bottom end having a pin thread that engages the box thread in the top end of the axial passage through the casing mandrel; at least one port through the sidewall that communicates with the axial passage; a top end that includes a tubing bowl; a tubing mandrel adapted to be received in the tubing bowl; a tubing bowl nut having a top flange for locking the tubing mandrel in the tubing bowl, the tubing bowl nut threadedly engaging a pin thread at a top of the sidewall of the tubing head spool; an annular flange located above the pin thread adapted to engage the box thread in the top end of the axial passage; and a lockdown nut adapted for threadedly engaging the pin thread on the casing mandrel top end to lock the tubing head spool to the casing mandrel, the lockdown nut being rotatably retained on the tubing head spool by the annular flange.