From 88beff7a9dfd0fc1c3375e80953fae61af1ede50 Mon Sep 17 00:00:00 2001
From: hnil <Halvor.M.Nilsen@sintef.no>
Date: Mon, 1 Apr 2019 12:55:06 +0200
Subject: [PATCH] Fixed pressure equation for case where water is not pressent,
 often used for co2 simulations

---
 opm/autodiff/ISTLSolverEbos.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/opm/autodiff/ISTLSolverEbos.hpp b/opm/autodiff/ISTLSolverEbos.hpp
index a336d92eb..964123385 100644
--- a/opm/autodiff/ISTLSolverEbos.hpp
+++ b/opm/autodiff/ISTLSolverEbos.hpp
@@ -194,7 +194,9 @@ protected:
         typedef typename GridView::template Codim<0>::Entity Element;
         typedef typename GET_PROP_TYPE(TypeTag, ElementContext) ElementContext;
         // Due to miscibility oil <-> gas the water eqn is the one we can replace with a pressure equation.
-        enum { pressureEqnIndex = BlackOilDefaultIndexTraits::waterCompIdx };
+        static const bool waterEnabled = Indices::waterEnabled;
+      static const int pindex = (waterEnabled) ? BlackOilDefaultIndexTraits::waterCompIdx : BlackOilDefaultIndexTraits::oilCompIdx;
+        enum { pressureEqnIndex = pindex };
         enum { pressureVarIndex = Indices::pressureSwitchIdx };
         static const int numEq = Indices::numEq;