projecting fluid flow lines 20 having wing valves 22 disposed within the lines 20 in one of many possible configurations a main bore 24 projects vertically along the production tree 18 and in line with the wellhead housing 12 a swab valve 26 is set in the main bore 24 for controlling the flow through the main bore 24 projecting upward from the end of the main bore 24 is a reentry mandrel 28 a protective net 30 is illustrated spanning between and connected to vertically mounted guideposts 32 that are oriented substantially parallel with the main bore 24 the lower ends of the guidepost 32 are mounted on a support frame 34 shown mounted on the wellhead housing 12 and radially extending outward the support frame 34 can be made up of individual structural elements or a plate like planar structure the subsea well head assembly 10 also includes a service control module scm 36 for local control of the valves 22 26 and other mechanisms provided on the wellhead assembly 10 a control line not shown such as a flying lead can be attached to the scm 36 for delivering control commands to and from the scm 36 fig1 b provides a perspective view of the wellhead assembly 10 of fig1 a in the embodiment of fig1 b the net 30 includes a series of interconnecting net members 37.