Advanced 3D Dynamic Model for Forensic Investigation of Reservoir Connectivity in Heterogeneous Systems

Quantifying the magnitude of pressure communication and characterizing reservoir properties among the wells are the key objectives of pressure interference tests. In this study, we will shed light on how to plan for a multi-well pressure interference test in a tight, heterogeneous carbonate reservoir with dynamic model. Then, we will explain the capabilities of the dynamic model to characterize reservoir properties especially between the wells where the uncertainty is high due to a lack of inter-well measured data. This study describes a multi-well, interference test design and analysis procedure for a tight carbonate reservoir for the purpose of developing an injector-producer pattern strategy. This subject test has been performed utilizing three wells. An active producer located in-between two shut-in injectors. These shut-in injectors have been equipped with high-resolution gauges to detect the pulses created by the active well. For accurate interference test results, we have constructed 3D dynamic model based on a high-resolution geological model. This model has been utilized as a platform to characterize the reservoir properties by matching the model output with test data. With this approach, we have successfully quantified the magnitude of hydraulic communication between the producer and each of the two injectors. Moreover, reasonable match results of the dynamic model with the pressure interference data has been achieved. With this quality match, a good understanding of heterogeneous reservoir properties between the producer and each of the injectors has been attained. In fact, the magnitudes of pressure communication between the producer and each of the injectors in addition to the reservoir transmissivity and storativity become the foundation of any future production-injection strategy as part of the development plan. Moreover, the interference test results can be incorporated into the full simulation model to enhance the quality of the model. This study demonstrates the value of utilizing 3D dynamic models for a multi-well interference test design and analysis. With this approach, the outcomes of the interference test, such as, magnitude of hydraulic communication, transmissivity, and storativity between the wells, impact the future development plan. Hence, reservoir engineers will have the upper hand in optimizing the production strategies as well as future developments.