Patent ID: 6966383

Claim:
A horizontal spool tree assembly for controlling fluid flow through a production tubing string within a well, the production tubing string defining a tubing annulus surrounding the tubing string, and the tree assembly adapted for use with a workover string for fluid communication with the tree assembly, the tree assembly comprising: a spool body defining a spool body central bore for receiving a tubing hanger therein, and a spool body production passageway extending laterally from the spool body central bore for fluid communication with a production line; the tubing hanger within the spool body central bore and sealed to the spool body, the tubing hanger adapted to support the production tubing string therefrom, the tubing hanger having a tubing hanger production bore for fluid communication with the production tubing string and a tubing hanger production passageway extending laterally from the tubing hanger production bore for fluid communication with the production passageway in the spool body; an annulus passageway extending laterally through the spool body below the tubing hanger for fluid communication with the tubing annulus; a first annulus valve for controlling fluid flow between the tubing annulus and an annulus line; a second annulus valve positioned downstream from the first annulus valve with respect to the tubing annulus for controlling fluid flow between the tubing annulus and the annulus line; a workover flow path in fluid communication with the annulus passageway and passing through the spool body, laterally into the tubing hanger, and upward through the tubing hanger to the spool body central bore above the tubing hanger, thereby providing fluid communication between the workover string and the tubing annulus; a crossover flow line in fluid communication with the annulus line between the first and second annulus valves and the production line; a crossover valve positioned along the crossover flow line; and a workover flow path in fluid communication with the annulus passageway between the first and second annulus valves, such that the first annulus valve controls fluid flow during a workover operation.