PRODUCED WATER REINJECTION INTO AN OIL RESERVOIR AND FORMATION DAMAGE

Among existence methods for produced water removal from oil reservoirs, water re – injection into underground layers of reservoir has been considered as a suitable method. But solid particles and other pollutants in this water will damage reservoir formations. Scale deposition is one of the most serious oil field problems that inflict water injection systems primarily when two incompatible waters are involved. Formation damage in this process is similar to cross-flow filtration. In this paper, external cake formation on well bore has been modeled in unsteady state conditions. For this purpose, first, the forces will be analyzed; then, fluid force and mass balances in unsteady state condition will be written. Finally, cake thickness, invasion and well fluid velocity profiles in unsteady state condition will be obtained.