From 33d58792dece9ca85b7ef7b5f926c8cbcda6ccca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Atgeirr=20Fl=C3=B8=20Rasmussen?= <atgeirr@sintef.no>
Date: Mon, 24 Mar 2014 15:28:46 +0100
Subject: [PATCH] Fix sign bug in well contribution to mass balance.

---
 opm/autodiff/FullyImplicitBlackoilSolver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/opm/autodiff/FullyImplicitBlackoilSolver.cpp b/opm/autodiff/FullyImplicitBlackoilSolver.cpp
index 4052b2417..1f52070c4 100644
--- a/opm/autodiff/FullyImplicitBlackoilSolver.cpp
+++ b/opm/autodiff/FullyImplicitBlackoilSolver.cpp
@@ -917,7 +917,7 @@ namespace {
 
         // Add well contributions to mass balance equations
         for (int phase = 0; phase < np; ++phase) {
-            residual_.mass_balance[phase] += superset(cq_s[phase],well_cells,nc);
+            residual_.mass_balance[phase] -= superset(cq_s[phase],well_cells,nc);
         }
 
         // Add WELL EQUATIONS