Introduction

The reservoir simulation is a technology of generalized use in the petroleum industry to evaluate actual and future reservoir performance. However, a general methodology for reservoir performance. However, a general methodology for reservoir simulation has not been completed defined in the literature.

In view that reservoir simulation is a basic tool of reservoir management, Maraven S.A decided to standardize the procedures involved into a reservoir simulation study, procedures involved into a reservoir simulation study, developing a methodology aimed to eliminate engineering and computing time waste during the process of model initialization, history match, and predictions, which represent the main part of the reservoir simulation process. Consequently, work processes were established and documented including flow diagrams, and forms were prepared to obtain information, in order to keep track of the prepared to obtain information, in order to keep track of the time used during the execution of each stage of the processes, allowing to use statistic control to monitor each processes, allowing to use statistic control to monitor each process performance. process performance. The application of the developed methodology allowed to identify the main time consuming activities, optimizing the studies execution process by reducing the risk of overlooking key aspects and variables, thus increasing the level of confidence of the simulation results.

Finally, the preliminary statistic control results have allowed to identify the following actions. 1) Guarantee the use of flow diagrams and measures of the time used in the execution of each process stage, 2) Develop automatic data processing and administration systems to accomplish the processing and administration systems to accomplish the simulator requirements, and 3) Continuous training in computerized tools.

GENERAL METHODOLOGY

The general methodology for reservoir simulation presented in this work, consisted of structuring into stages the process of initialization, history, match, and predictions. The aim was to provide new reservoir simulator predictions. The aim was to provide new reservoir simulator users with a detailed description of the activities (a series of actions and changes) involved in the execution of each of the main reservoir simulation processes. Figures 1, 2 and 3, shown the flow diagrams of each process. Detailed discussion of the different stages involved in each process will be presented next.

PROCESS FOR INITIALIZATION OF THE PROCESS FOR INITIALIZATION OF THE RESERVOIR SIMULATION MODEL

The initialization process consist of the reservoir model validation through the calculation of the original fluid in place volumes. The model initialization allow to establish place volumes. The model initialization allow to establish the initial fluid saturation and pressure distribution within the reservoir. The flow diagram presented in Figure l, show the procedure to carry out the initialization process for the hypothetical general case of a reservoir with a gas cap and water zone.

A detail discussion of the different stages involved is presented next. presented next.

1. Preliminary initialization run

The first run of the initialization data is conducted in order to check data entry format errors. As result the pressure, fluids saturation distribution, and fluid in place pressure, fluids saturation distribution, and fluid in place volumes for the different fluids inside the reservoir are obtained, i.e., the simulator interpreted initialization data.

2. Data entry verification

Normally, the first initialization run of a simulation model may abort dub to errors in data entry formats, inconsistency of relative permeabilities and/or PVT data. The errors of initialization data are normally of the following types. Parametric problems, fluid properties tables, saturation Parametric problems, fluid properties tables, saturation tables, equilibrium condition tables, aquifer definition, and array generation.

P. 35

This content is only available via PDF.
You can access this article if you purchase or spend a download.