Modelling of mineral precipitation in fractures with variable aperture

Patwardhan, Sanjay; Singh, Deepak; Abhishek, Rockey; Govindarajan, Suresh Kumar

doi:10.1080/09715010.2016.1241725

Cited by 1 publication

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“…Low salinity water flooding has emerged as a cheap and environmentally friendly technique for improving oil recovery [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. Increased calcite dissolution induced by the interaction between the injected low salinity water and calcite [ 42 , 43 , 44 , 45 ] during flooding may lead to a loss of rock integrity [ 46 ]. However, we found that silica nanoparticles could reduce calcite dissolution by ≈30% induced by low salinity flooding of chalk, in addition to increasing oil recovery that can be achieved by low salinity flooding alone [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Salinity on Silica Nanoparticle Adsorption Kinetics and Mechanisms for Fluid/Rock Interaction with Calcite

Hamouda

Abhishek

2019

Nanomaterials

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This study addresses the kinetics of silica nanoparticle adsorption on calcite from a solution at three salinities: deionized water (DIW), synthetic seawater (SSW), and low salinity water (LSW). The nanoparticle adsorption mechanisms and the effects on calcite dissolution are addressed. It was shown that nanoparticle adsorption was best described with the second-order-kinetic model and that silica nanoparticle adsorption reduced calcite dissolution. This was confirmed by measuring the Ca2+ ion concentration, the pH, and by estimating the amount of calcite dissolved. This is an important conclusion of this work, especially as LSW as an enhanced oil recovery technique is a candidate for use in chalk fields. Less formation damage/dissolution of chalk when silica nanoparticles are combined with LSW can lower the risk of reservoir subsidence. Intraparticle diffusion and the pseudo-second-order models, indicated a reduction in the adsorption rate with increasing nanoparticle concentration in LSW. This is explained by possible repulsive forces among the nanoparticles as they diffuse from the bulk fluid onto the calcite surface. Ion charges reduce the repulsion among the nanoparticles through shielding. However, an increasing nanoparticle concentration reduces the shielding efficiency by the ions. Estimates of the surface forces confirmed that nanoparticle–mineral interaction is less attractive in LSW as compared to SSW and DIW.

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