184 having a frustaconical outer surface expander tool 144 also includes a piston section 186 in operation once sand control screen 140 is positioned across openings 142 of slotted liner 138 as depicted in fig5 expander tool 144 may be operated to expand the diameter of end sections 160 162 of sand control screen 140 specifically expander member 178 is longitudinally moved through end section 160 and expander member 180 is longitudinally moved through end section 162 as best seen in fig6 in the illustrated embodiment this may be achieved by operating a downhole power unit disposed within support member 176 electricity for the downhole power unit is provided via electric line 152 the downhole power unit may be used to rotate a threaded member within piston section 186 which urges expander member 178 and expander member 180 toward one another alternatively the downhole power unit may be used to pump fluid from a downhole hydraulic fluid source disposed with support member 176 into piston section 186 to urges expander member 178 and expander member 180 toward one another in either case expander member 176 is downwardly urged such that the frustaconical surface of tapered cone section 182 of expander member 176 contacts the interior wall of cylindrical ramp section 164 likewise expander member 180 is upwardly urged such that the frustaconical surface of tapered cone section 184 of expander member 180 contacts the interior wall of cylindrical ramp section 168 tapered cone sections 182 184 respectively apply a radially outward force to cylindrical ramp sections 164 168 when this force is sufficient to plastically deform cylindrical ramp sections 164 168 expander members 178 180 begin to.