Wettability Altering Secondary Oil Recovery in Carbonate Rocks

Mohan, Kshitij; Gupta, Robin; Mohanty, Kishore K.

doi:10.1021/ef200449y

Cited by 95 publications

(57 citation statements)

References 34 publications

(36 reference statements)

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“…Addition of chemical agents can modify rock wettability and therefore, increases the efficiency of waterflooding process. Numerous experimental works have been published discussing the role of chemical agents in wettability alteration of porous media Strand et al 2003;Standnes and Austad 2003;Hognesen et al 2004;Mohan et al 2011;Ravari et al 2011;Tabrizy et al 2011). However, the role of Nanoparticles in this field is still in its infancy and consequently has attracted the attention of many researchersin last decade due to their specific characteristics (Ju et al 2002(Ju et al , 2006Shen and Resasco 2009;Zhang et al 2010;Suleimanov et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of SiO2 nanoparticles on enhanced oil recovery of carbonate reservoirs

Roustaei¹,

Bagherzadeh²

2014

J Petrol Explor Prod Technol

187

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Wettability alteration is an important method to increase oil recovery from oil-wet carbonate reservoirs. Chemical agents are used as wettability modifiers in carbonate systems; however, the role of Nanoparticles in this field is still in its infancy and consequently has attracted the attention of many researchers in the last decade. In this work, the impact of SiO 2 Nanoparticles on the wettability of a carbonate reservoir rock was experimentally studied. The impact of these Nanoparticles on the wettability of carbonate systems is still in its infancy. For this purpose, the effect of Nanofluid's concentration on wettability and interfacial tension were investigated to determine the optimum concentration of Nanofluid for injection into core samples. The result suggests that a concentration of 4 g/L of Nanofluid could significantly alter the wettability of the rock from a strongly oil-wet to a strongly water-wet condition. Moreover, we studied the Nanofluids' potential in enhanced oil recovery of oil-wet core plugs. The results show that a considerable amount of oil can be recovered right after start of water injection to the aged core plug with Nano fluid.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of SiO2 nanoparticles on enhanced oil recovery of carbonate reservoirs

Roustaei¹,

Bagherzadeh²

2014

J Petrol Explor Prod Technol

187

View full text Add to dashboard Cite

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“…Other EOR methods aim to trigger fluid -rock interactions that cause a wettability alteration of the reservoir rock, from oil-wet to water-wet, liberating additional oil (e.g. Mohan et al 2011). One example of this alteration is controlled-salinity water flooding, in which chemical species such as SO 4 22 , Mg 2+ and Ca 2+ dissolved in the brine phase interact with the surface of carbonate minerals.…”

Section: Fundamental Controls On Fluid Flow In Carbonatesmentioning

confidence: 99%

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

Agar

Geiger

2014

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The introduction reviews topics relevant to the fundamental controls on fluid flow in carbonate reservoirs and to the prediction of reservoir performance. The review provides research and industry contexts for papers in this volume only. A discussion of global context and frameworks emphasizes the value yet to be captured from compare and contrast studies. Multidisciplinary efforts highlight the importance of greater integration of sedimentology, diagenesis and structural geology. Developments in analytical and experimental methods, stimulated by advances in the materials sciences, support new insights into fundamental (pore-scale) processes in carbonate rocks. Subsurface imaging methods relevant to the delineation of heterogeneities in carbonates highlight techniques that serve to decrease the gap between seismically resolvable features and well-scale measurements. Methods to fuse geological information across scales are advancing through multiscale integration and proxies. A surge in computational power over the last two decades has been accompanied by developments in computational methods and algorithms. Developments related to visualization and data interaction support stronger geoscience-engineering collaborations. High-resolution and real-time monitoring of the subsurface are driving novel sensing capabilities and growing interest in data mining and analytics. Together, these offer an exciting opportunity to learn more about the fundamental fluid-flow processes in carbonate reservoirs at the interwell scale.

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“…This technique does not simulate the reservoir conditions of temperature and pressure (Muhammad and Rao 2003), and was found to be insensitive at low IFTs (Vijapurapu and Rao 2004). One can measure advancing and receding contact angles from the images of oil droplets on rock surfaces.…”

Section: Introductionmentioning

confidence: 99%

A Procedure for Measuring Contact Angles When Surfactants Reduce the Interfacial Tension and Cause Oil Droplets to Spread

Adejare

Nasralla

Nasr‐El‐Din

2014

SPE Reservoir Evaluation &Amp; Engineering

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Viscoelastic surfactants (VESs) are used as diverting agents in carbonate matrix acidizing. However, these surfactants can adversely affect the wettability around the wellbore.Receding contact angles were measured with the conventional method to study the effect of spent-acid solutions with an amphoteric amine-oxide VES and the mutual solvent ethylene glycol monobutyl ether (EGMBE) on the wettability of Austin cream chalk rocks. The conventional method involves the injection of oil droplets into the surfactant solution. However, contact angles could not be measured when oil droplets were injected into spentacid solutions with VES and EGMBE, because low oil/acid interfacial tensions (IFTs) cause them to spread on the rock surface.A new procedure was used for these contact-angle measurements. Rocks were centrifuged in spent-acid solutions with VES and EGMBE, so that the surfactant changed the interfacial properties of the rock. Then, contact angles were measured in spent acid with hydrochloric acid (HCl) only, to prevent VES and EGMBE from reducing the oil/acid IFT. The effect of the surfactants in the spent acid on the acid/rock and acid/oil IFT, which is the wettability, is shown by the difference in contact angles before and after centrifuging.With the new procedure, a spent-acid solution with HCl, 1 vol% of VES, and 10 vol% of EGMBE made an oil-wet rock water-wet and a water-wet rock strongly water-wet at 25 C. This suggests that an EGMBE post-flush enhances the relative permeability to oil, under the parameters investigated.Contact angles are a function of the oil/rock, acid/rock, and oil/acid IFTs. However, the wettability of the rock is a function of the oil/rock and acid/rock IFT only. The new procedure measures contact angles in such a way that the surface-active agents change the oil/rock and acid/rock IFT only so that "spreading," an artifact caused by oil/acid IFT reduction, may not occur.

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Wettability Altering Secondary Oil Recovery in Carbonate Rocks

Cited by 95 publications

References 34 publications

Experimental investigation of SiO2 nanoparticles on enhanced oil recovery of carbonate reservoirs

Experimental investigation of SiO2 nanoparticles on enhanced oil recovery of carbonate reservoirs

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

A Procedure for Measuring Contact Angles When Surfactants Reduce the Interfacial Tension and Cause Oil Droplets to Spread

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