This paper provides an integrated evaluation study of thermo-chemical injection in heavy oil carbonate reservoirs. The objective of this study that is established through an optimum development plan is to appraise the possibility of improving the recovery factor and production rate of these reservoirs in an economic way, which will help to extend the productive life and profits of many neglected heavy oil reservoirs. This paper will share the work flow of planning, designing, and evaluating the experimental work and simulation studies of the project.
Within the study, a reservoir example of a large carbonate Middle Eastern reservoir that may utilize advanced production of heavy oil using thermo-chemical flooding is presented. Thorough investigations are carried out by employing several analyses to the aforementioned technique as it is considered the scope of this project. To approach this goal, a number of core flooding experiments are conducted on oil and rock samples obtained from the reservoir under the same conditions of the pressure and temperature measurements. Specific equipment required for the experiments are designed and assembled in order to accomplish these operations.
Fluid characterization is done for the oil, and the prepared chemical solutions. Along with this, rock properties of the used core samples are examined. The performed experiments are operated with different chemical concentrations that are analyzed to determine the best combination based on the economic studies. The applicability of thermal process during the chemical injection has been also examined by several experimental runs. Implementing this type of techniques will give an extra benefit to the reservoir by reducing its oil viscosity. This reduction will yield to a substantial increment in the oil production and therefore will maximize the oil recovery.
In order to clarify the impact of the used techniques on the reservoir, the rock sample properties are checked intensively throughout the flooding processes. Several geological tests are also conducted on the cores before and after the application of the experiments to determine whether the samples are affected or not.