Investigation of Anhydrite Dissolution as a Potential Low Salinity Waterflooding Mechanism in Carbonates

Uetani, Takaaki; Kaido, Hiromi; Yonebayashi, Hideharu

doi:10.3997/2214-4609.201900125

Cited by 4 publications

(1 citation statement)

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“…Indeed, the studied rock contained anhydrite, a mineral that may be destabilized (dissolved) by external waterflooding at reservoir temperature conditions, thus improving the access to pores and the oil recovery. However, that possible correlation between anhydrite dissolution and oil recovery improvement was not confirmed in another study (Uetani et al, 2019). Still, Zahid et al (2012) suggest a migration of fines as a possible origin of oil recovery improvement in Middle East carbonate cores.…”

Section: Carbonatesmentioning

confidence: 84%

Low salinity effects on oil recovery performance: underlying physical mechanisms and practical assessment

Bourbiaux

2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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This paper is a tentative synthesis of the main knowledge and experience gained from recent studies and application of Low Salinity Water Injection (LSWI) in carbonate and clayey silico-clastic rocks. A physical model based on ionic force is presented to explain the so-called Dual Layer Expansion (DLE) mechanism often invoked to account for the Low Salinity Effects (LSE) on rock wettability and oil recovery. The role played by the Multi Ion Exchange (MIE) mechanism is clarified, at least for clayey rocks. Eventually, the proposed physical analysis shows the complementary roles that injected brine concentration and composition can play on waterflood recovery efficiency depending on the Crude Oil Brine Rock (COBR) system under consideration. To account for the diversity of COBR systems, a straightforward modelling methodology is then proposed to simulate laboratory LSWI tests on a case-by-case basis and infer the actual evolution of residual oil saturation with brine concentration and/or composition. The simulation involves a wettability driver that may be either the global salinity or the square root of ionic force. The analysis of published results actually shows that the latter predicts low salinity effects on residual oil saturation better than the former. Hopefully, this paper contributes to the understanding of the DLE and MIE mechanisms induced by a smart water injection and provides a simple and robust methodology to simulate the reference coreflood experiments that remain necessary to assess and optimize LSWI.

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Section: Carbonatesmentioning

confidence: 84%

Low salinity effects on oil recovery performance: underlying physical mechanisms and practical assessment

Bourbiaux

2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Experimental study and surface complexation modeling of non-monotonic wettability behavior due to change in brine salinity/composition: Insight into anhydrite impurity in carbonates

Mogharrab

Ayatollahi²

2022

Journal of Molecular Liquids

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Effects and Mechanisms of Acidic Crude Oil–Aqueous Solution Interaction in Low-Salinity Waterflooding

Chai

Liu

et al. 2021

Energy Fuels

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Crude oil−aqueous solution interactions play an important role in low-salinity waterflooding, but their effects and mechanisms have not been well clarified. Core flooding experiments were first conducted to analyze the effects of crude oil− aqueous solution interactions on enhanced oil recovery (EOR). Then, interfacial tension (IFT) and interfacial dilatational rheology (IDR), total organic carbon (TOC), and ζ-potential measurements were combined to investigate the mechanisms of crude oil− aqueous solution interactions in low-salinity waterflooding. Core flooding results showed that crude oil−aqueous solution interactions are important in low-salinity waterflooding and that adjusting the ionic composition of the aqueous solution could affect EOR. Herein, Mg 2+ and Ca 2+ both had positive effects on EOR, while SO 4 2− showed no positive effect. The IFT and IDR, TOC, and ζ-potential results indicated that the ionic composition of aqueous solutions has a great influence on crude oil−aqueous solution interactions. Thereof, Mg 2+ , Ca 2+ , and Na + preferentially interact with acidic polar molecules and enhance crude oil−aqueous solution interactions, and the intensity is Mg 2+ > Ca 2+ > Na + . SO 4 2− interacts with cations and acidic polar molecules simultaneously, consequently reducing the effects of cations on crude oil−aqueous solution interactions in varying degrees. Therefore, the positive effects of Ca 2+ and Mg 2+ exceed the negative influence of SO 4 2− in CaSO 4 and MgSO 4 , while the negative impact of SO 4 2− outweighs the positive effect of Na + in Na 2 SO 4 .

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Investigation of Anhydrite Dissolution as a Potential Low Salinity Waterflooding Mechanism in Carbonates

Cited by 4 publications

References 0 publications

Low salinity effects on oil recovery performance: underlying physical mechanisms and practical assessment

Low salinity effects on oil recovery performance: underlying physical mechanisms and practical assessment

Experimental study and surface complexation modeling of non-monotonic wettability behavior due to change in brine salinity/composition: Insight into anhydrite impurity in carbonates

Effects and Mechanisms of Acidic Crude Oil–Aqueous Solution Interaction in Low-Salinity Waterflooding

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