Add initial cut at well definition.

well.h

@@ -0,0 +1,31 @@
+#ifndef WELL_H_INCLUDED
+#define WELL_H_INCLUDED
+
+enum well_type         { INJECTOR, PRODUCER };
+enum well_control_type { BHP     , RATE     };
+
+#define WELL_DESCRIPTOR                         \
+    int                     number_of_wells;    \
+                                                \
+    enum well_type         *type;               \
+                                                \
+    enum well_control_type *control_type;       \
+    double                 *target;
+
+#define WELL_TOPOLOGY                           \
+    int *well_connpos;                          \
+    int *well_cells;
+
+#define WELL_CONNECTION_DATA                    \
+    double *WI;                                 \
+    double *depth;
+
+/* ---------------------------------------------------------------------- */
+
+typedef struct {
+    WELL_DESCRIPTOR
+    WELL_TOPOLOGY
+    WELL_CONNECTION_DATA
+} well_t;
+
+#endif