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Monitoring Fluid Flow in Oil Reservoirs Using Downhole Measurements of Self-PotentialNormal access

Authors: M. Alarouj and M. Jackson
Event name: 81st EAGE Conference and Exhibition 2019
Session: Field Appraisal and Development (Joint EAGE/SPE)
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901221
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 631.74Kb )
Price: € 20

Summary:
Self-Potential (SP) logging using wireline tools in open-hole wells is a common method for characterizing hydrocarbon reservoirs. However, SP signals are also generated during production with the availability of an active aquifer or water flooding due to gradients in pressure, temperature and composition. Continuous downhole measurements of these signals could be interpreted to track saturation changes within the reservoir. In this study, numerical modeling was used to simulate the SP generated during oil production from a sandstone reservoir supported with water injection. Our results suggested that measurable SP signals can be detected early before water breakthrough using electrically insulated electrodes installed at a monitoring well. Theses SP signals can be interpreted and related to the water front location. Interpretations of the resulted SP suggested that the water front can be sensed up to 150m away from the monitoring well. Sensitivity analysis showed the dependency of the SP signals on the reservoir permeability, production rate, formation and injected water salinities.


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