Impact of Geological Heterogeneity on Performance of Secondary and Tertiary Low Salinity Water Injection

Attar, Ahmed; Muggeridge, Ann

doi:10.2118/172775-ms

Cited by 13 publications

(6 citation statements)

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“…Within the oil industry the spatial distribution and geometry of the reservoir bodies is commonly investigated (Jones et al, 1995;Willis and Tang, 2010;Attar et al, 2015). The geometry and distribution control the reservoir connectivity, which is the ratio of the volume of the largest connected reservoir body over the sum of the volume of all reservoir bodies.…”

Section: Introductionmentioning

confidence: 99%

The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs

et al. 2016

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a b s t r a c tA three-dimensional model is used to study the influence of facies heterogeneity on energy production under different operational conditions of low-enthalpy geothermal doublet systems. Process-based facies modelling is utilised for the Nieuwerkerk sedimentary formation in the West Netherlands Basin to construct realistic reservoir models honouring geological heterogeneity. A finite element based reservoir simulator is used to model the fluid flow and heat transfer over time. A series of simulations is carried out to examine the effects of reservoir heterogeneity (Net-to-Gross ratio, N/G) on the life time and the energy recovery rate for different discharge rates and the production temperature (T min ) above which the doublet is working. With respect to the results, we propose a design model to estimate the life time and energy recovery rate of the geothermal doublet. The life time is estimated as a function of N/G, T min and discharge rate, while the design model for the energy recovery rate is only a function of N/G and T min . Both life time and recovery show a positive relation with an increasing N/G. Further our results suggest that neglecting details of process-based facies modelling may lead to significant errors in predicting the life time of low-enthalpy geothermal systems for N/G values below 70%.

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Section: Introductionmentioning

confidence: 99%

The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs

et al. 2016

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“…The effect of low-salinity waterflooding on sandstone has been thoroughly investigated in contrast to carbonate rocks. Clay particles distributed in the sandstone pore structure play an important role in the suggested wettability alteration mechanism explanations, which is not the case in carbonate rocks. − From the low-salinity waterflooding in sandstone reservoirs, several mechanisms have been suggested, such as IFT reduction and pH increase by McGuire et al, fines migration by Tang and Morrow, multicomponent ionic exchange (MIE) by Lager et al, salt-in effects by RezaeiDoust et al, and wettability alteration and osmotic pressure by Buckley and Morrow, related to salinity contrasts between the formation water (FW) and injection water. Also, low-salinity waterflooding leads to expansion of the electrical double layer (EDL) between the clay and oil interfaces and altered the sandstone wettability toward water-wet conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Low-Salinity Waterflooding in Secondary and Tertiary Enhanced Oil Recovery in Limestone Reservoirs

Gandomkar

Rahimpour

2015

Energy Fuels

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Improved oil recovery from oil-wet low-permeability limestone reservoirs is a great challenge by altering the reservoir rock wettability. The purpose of this study is to compare the results of low-salinity waterflooding in secondary and tertiary modes to decrease the residual oil saturation from limestone reservoirs. Three different stock-tank crude oils and limestone cores are used in this study. All of the coreflooding experiments were performed at 60 °C and 2000 psi by injection of actual formation and seawater, with brine solutions containing single-component salt, such as MgSO 4 , KCl, Na 2 SO 4 , CaCl 2 , MgCl 2 , and NaCl, with a wide range of salinity levels. During low-salinity flooding in secondary recovery, the dominant displacement-suggested mechanism is snap-off, which results in an oil recovery factor with different values for the various wettability conditions. The most interesting result is that tertiary low-salinity recovery was never observed in these coreflooding experiments. The measured effect of tertiary low-salinity waterflooding from limestone core experiments was rock dissolution, as a result of surface reactions, and an increase in water relative permeability.

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“…It was observed that heterogeneity plays less important role in the case of carbonates compared to sandstones. (Attar et al 2015;Attar et al 2018) studied the impact of heterogeneity on oil recovery and water cut when low salinity waterflood is being employed as a secondary and tertiary method. They observed that the heterogeneity plays an important role in carbonates and that the water cut was being encountered earlier compared to homogeneous model.…”

Section: Impact Of Heterogeneity On Lswf Performance In Carbonatesmentioning

confidence: 99%

A review on low salinity waterflooding in carbonates: challenges and future perspective

Nande

Patwardhan

2021

J Petrol Explor Prod Technol

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Low salinity waterflooding has gained significant attention and importance in the last decade, as it is seen as an impactful method for recovery of additional oil from carbonate reservoirs. Existing literature does not do justice to the underlying mechanisms that aid in the recovery of additional oil from such rock types. In this paper, we present a comprehensive review of the research conducted on low salinity waterflooding in carbonates and further provide a detailed and critical analysis on the same. The intention of this paper is also to present a condensed research summary on the said topic, and to chart out a detailed roadmap for future work, thereby opening the possibilities of new avenues of research in the field.

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Impact of Geological Heterogeneity on Performance of Secondary and Tertiary Low Salinity Water Injection

Cited by 13 publications

References 1 publication

The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs

The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs

Investigation of Low-Salinity Waterflooding in Secondary and Tertiary Enhanced Oil Recovery in Limestone Reservoirs

A review on low salinity waterflooding in carbonates: challenges and future perspective

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