Video: Pressure Pulse Testing Method for Caprock Characterization
- Mojtaba Mosaheb (Louisiana State University) | Mehdi Zeidouni (Louisiana State University) | Mahmood Shakiba (The University of Texas at Austin)
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- Society of Petroleum Engineers
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- 2018. Copyright is retained by the author. This presentation is distributed by SPE with the permission of the author. Contact the author for permission to use material from this video.
- 5.4 Improved and Enhanced Recovery, 6.5.3 Waste Management, 2 Well completion, 2.1.3 Completion Equipment, 2.2.2 Perforating, 5.4 Improved and Enhanced Recovery, 2.2 Installation and Completion Operations, 5.6 Formation Evaluation & Management, 6.3 Safety, 5.6.3 Pressure Transient Testing, 5 Reservoir Desciption & Dynamics
- Analytical solution, Caprock, Characterization, Pulse testing
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Pressure transient testing is a method to obtain information on reservoir characteristics. Thin shale layers isolating productive intervals in a reservoir have important implications for reservoir development and EOR strategies. In addition, weaknesses in caprocks overlying injection intervals may adversely affect the safety of fluid injection approaches including gas storage, waste water disposal, and CO2 geological storage. Even low permeability of a caprock overlying the injection zone can be very important by allowing for pressure dissipation out of the reservoir. In this work, we apply harmonic pressure testing method to characterize a caprock overlying a given injection zone. The diffusivity equations are written and solved in frequency domain for system of injection layer and above zone with the low permeability caprock in between. A vertical well is perforated in the middle of the injection layer. A periodic flow rate pulse is disseminated from the injection well. The pressure pulses traveled through the caprock are observed in the above zone. The hydraulic characteristics of the low permeability caprock are estimated applying the analytical solution based on the above zone pressure amplitude. The caprock diffusivity is found to be in acceptable agreement with the true value. It is shown that the harmonic pulse testing is useful to characterize the intra/inter reservoir low permeability layers (caprocks).