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Abstract

Summary

Low Salinity Modified Water (LSMW) injection is considered as promising advanced water based Enhanced Oil Recovery (EOR) technique. Understanding the mechanism of modified water injection and its impact is complex due to several chemical liquid-solid interactions. This work presents an experimental study to better investigate the effects of Low Salinity Modified Water injection on oil recovery by in situ monitoring of fluid displacement relying on 3D X-Ray CT imaging.

In this paper, we report the results of sets of advanced core-flooding experiments carried out on outcrop and reservoir sandstone plugs to study the effect of formation water, Low Salinity water (LSW) and modified water composition (MW) on oil recovery. A set of experiments are conducted, where different brine solutions with different salt compositions are injected in tertiary mode, by following the displacements with an advanced X-Ray CT (Computed Tomography) scanner. In our experiments, we measured dynamically pressure variation, oil recovery, pH and conductivity. Additionally interfacial tension (IFT) was measured for some of the collected fluid during outcrop core experiment. On outcrop core an additional experiment in absence of oil was carried out, to highlight the dynamical behaviour of salinity front and displacement. All the core-flooding tests were conducted in tertiary mode by reducing the salinity and modifying the ionic composition of injected water. The oil recovery is obtained through quantification of CT scans acquired during the dynamic flooding.

The results of core-flooding experiments showed the differential effects of Low Salinity Modified Water on increasing the pH and wettability alteration toward more water wet, reducing residual oil saturation. With the aid of advanced core-flooding setup integrated with industrial X-Ray tomography, we were able to deeper monitor the complex dynamics displacements leading to advanced observation of the effects of local sample inhomogeneity on oil recovery.

By optimizing the water salinity and composition, LSMW injection as advanced water based EOR technique, can be implemented to enhance oil recovery in favorable conditions.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202331007
2023-10-02
2025-06-13

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References

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/content/papers/10.3997/2214-4609.202331007
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Low Salinity Modified Water Investigation by Advanced Core-Flooding Under X-Ray Tomographic Monitoring
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202331007
/content/papers/10.3997/2214-4609.202331007
/content/papers/10.3997/2214-4609.202331007
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