comprise a variety of components depending on the specific application and well environment in which a production operation is to be conducted specific examples are discussed to facilitate an understanding of the present system and technique the present invention however is not limited to the specific embodiments described in one embodiment production control system 24 comprises a horizontal tree section 34 having for example a production line 36 and an annulus line 38 a blowout preventer 40 e g a blowout preventer stack may be positioned in cooperation with the horizontal tree section 34 to protect against blowouts these components also comprise an internal passageway 42 to accommodate passage of tubing string components 44 and related components such as a tubing hanger running tool 45 the production control system 24 also may comprise a variety of additional components incorporated into or positioned above blowout preventer 40 for example at least one pipe ram 46 may be mounted in subsea installation 22 at a suitable location in embodiment illustrated two pipe rams 46 are employed the system also may comprise at least one shear ram 48 such as the two shear rams illustrated additionally one or more e g two annular rams 50 may be employed in the system the various production control systems 24 accommodate a riser 52 designed to receive subsea test tree 26 in the embodiment illustrated the subsea test tree 26 comprises an upper portion 54 releasably coupled with a lower portion 56 via a connector 58 such as a latch connector the upper portion 54 and the lower portion 56 each contain at least one shut off valve.