Measurements of streaming potential for downhole monitoring in intelligent wells

M. Z. Jaafar, J. Vinogradov, M. D. Jackson, J. H. Saunders, C. C. Pain

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations


Downhole monitoring of streaming potential, using electrodes mounted on the outside of insulated casing, is a promising new technology for monitoring water encroachment towards an intelligent well. However, there arc still significant uncertainties associated with the interpretation of the measurements, particularly concerning the streaming potential coupling coefficient. This is a key petrophysical property which dictates the magnitude of the streaming potential for a given fluid potential. The coupling coefficient can be measured experimentally, but previous studies have obtained data for sandstone cores saturated with relatively low salinity brine (less than seawater). Formation and injected brine in hydrocarbon reservoirs is typically more saline than this. Extrapolating data obtained at low salinity into the high salinity domain suggests that the coupling coefficient falls to zero at approximately seawater salinity. If this is the case, then streaming potential signals will be very small in most hydrocarbon reservoirs. We present the first measured values of streaming potential coupling coefficient in sandstone cores saturated with brine at higher than seawater salinity. We find that the coupling coefficient is small, but still measurcable, even when the brine salinity approaches the saturated concentration limit. Consistent results arc obtained from two independent experimental setups, using specially designed electrodes and paired pumping experiments to eliminate spurious electrical potentials. We apply the new experimental data in a numerical model to predict the streaming potential signal which would be measured at a well during production. The results suggest that measured signals should be resolvable above background noise in most hydrocarbon reservoirs, and that water encroaching on a well could be monitored while it is several tens to hundreds of metres away.

Original languageEnglish
Title of host publication16th Middle East Oil and Gas Show and Conference 2009, MEOS 2009
Number of pages14
StatePublished - 2009
Externally publishedYes
Event16th Middle East Oil and Gas Show and Conference 2009, MEOS 2009 - Manama, Bahrain
Duration: 15 Mar 200918 Mar 2009

Publication series

NameSPE Middle East Oil and Gas Show and Conference, MEOS, Proceedings


Conference16th Middle East Oil and Gas Show and Conference 2009, MEOS 2009


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