Coupled Well Card (EOR)

STOMP-EOR is designed to solve problems involving the transport of energy, water, CO₂, CH₄, salt, and a user-defined number of petroleum components with passive solutes or reactive species through variably saturated geologic media under non-isothermal conditions.  The Coupled Well Card allows the user to specify injection and production wells, whose conservation equations are fully integrated into the conservation equations for the reservoir.  Wells are specified by defining a well trajectory and an injection/production schedule.  Injection wells are both rate and pressure controlled.  The couple-well model for injection wells injects the specified fluid at the specified rate, unless the pressure limit is exceeded, in which case the injection rate is controlled by the pressure limit.  In the current version of STOMP-EOR production wells are only pressure controlled, which means fluid production is controlled by the specified pressure.  Both injection and production wells can vary over time, and the injection well scheduling includes options for switching the fluid composition, such as required for water alternating gas (WAG) schemes.  The composition of fluids in the production well depends on the fluids in the reservoir and the relative mobility of those fluids.  Scheduling of both injection and production wells can be cyclic, allowing for a repeating schedule.  Specification of fluid compositions for injection wells is similar to that for specifying fluid compositions for initial conditions and boundary conditions.