EXPERIMENTAL AND ECONOMIC STUDIES OF OPTIMUM MATRIX ACIDIZING IN VARIOUS SANDSTONE RESERVOIRS

Sandstone acidizing in oil industry has been considered a crucial process to treat and enhance permeability of hydrocarbon reservoirs due to permeability reduction using drilling mud. Corrosion rate is a significant parameter in a traditional acidizing which is used mineral acids to do sandstone treatment, and this parameter can be norm to apply treatment successfully. The main objective in this paper is to discover a new technique to apply the treatment job by injecting organic mud acids mixture as one-step in order to minimize the treatment cost and implementation time practically. Furthermore, this technique is injected inside the various scenarios such as fractured and unfractured “homogeneous” cores, damaged and undamaged cores using drilling mud, and the treatment job is then evaluated by the pre- and post- permeabilities measurements at high pressure and temperature. Moreover, the consumption and cost of acids and materials using the new treatment technique for each experiment are investigated, and then compare them with the traditional treatment technique economically. The porosities and permeabilities of unfractured “homogeneous” cores in both damaged and undamaged cases are concluded enhancement and improvement after complete treatment stages. In contrast, the permeability of 45 degree fractured core is mistreatment especially around fracture because it is observed that the acids can pass through the fracture and channel which do not have any resistances. Finally, a traditional treatment technique is costly rather than a new treatment technique economically, thus, the new treatment technique can be more benefit for industry. In order to treat and simulate homogenous formation, the consumption of acids in damaged core is logically higher than in undamaged core.