drop using statement for ref_depth_

rather qualify member variable with this->

opm/simulators/wells/MultisegmentWell.hpp

@@ -181,7 +181,6 @@ namespace Opm
         WellSegments::MultiPhaseModel multiphaseModel() const;
 
         // protected member variables from the Base class
-        using Base::ref_depth_;
         using Base::number_of_perforations_; // TODO: can use well_ecl_?
         using Base::number_of_phases_;
 

opm/simulators/wells/MultisegmentWell_impl.hpp

@@ -908,7 +908,7 @@ namespace Opm
 
         const int nseg = this->numberOfSegments();
         double seg_bhp_press_diff = 0;
-        double ref_depth = ref_depth_;
+        double ref_depth = this->ref_depth_;
         for (int seg = 0; seg < nseg; ++seg) {
             // calculating the perforation rate for each perforation that belongs to this segment
             const double segment_depth = this->segmentSet()[seg].depth();