Hybrid mixed discontinuous Galerkin finite element method for incompressible wormhole propagation problem.

Wormhole propagation plays a very important role in the product enhancement of oil and gas reservoir. A new combined hybrid mixed finite element method is proposed to solve incompressible wormhole propagation problem with discontinuous Galerkin finite element procedure, in which, the new hybrid mixed finite element algorithm is established for pressure equation, while the discontinuous Galerkin finite element method is considered for concentration equation, and then the porosity function is computed straightly by the approximate value of the concentration. This new combined method can keep local mass balance, meantime it also keeps the boundedness of the porosity. The convergence of the proposed method is analyzed and the optimal error estimate in L 2 -norm is derived. Finally, by the first-order backward Euler scheme in time, numerical examples are presented to verify the validity of the algorithm and the correctness of the theoretical results. [ABSTRACT FROM AUTHOR]