Water sensitivity of sandstones containing swelling and non-swelling clays

Mohan, K. Krishna; Fogler, H. Scott; Vaidya, Ravimadhav; Reed, M.G.

doi:10.1016/b978-1-85861-038-2.50020-6

Cited by 37 publications

(65 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the presence of clay minerals is seen to be a key requirement for low-salinity EOR to operate. 4,[6][7][8] This is due to the role that clays play in determining the wettability state of a rock. Clay minerals and quartz grains are widely present in the pores of sandstone reservoirs, where they form surface coatings.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that the salinity and saturation of connate water, 3-5 the reservoir's initial wettability 3 along with the presence of clay minerals 6,7 and polar oil components 4 all 1 play an important role on the degree to which the injection of low-salinity water increases oil production. Moreover, the presence of clay minerals is seen to be a key requirement for low-salinity EOR to operate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular Dynamic Simulations of Montmorillonite–Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery

et al. 2015

View full text Add to dashboard Cite

Publisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in Journal of physical chemistry C, copyright c 2015 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/acs.jpcc.5b00555Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractEnhanced oil recovery is becoming commonplace in order to maximise recovery from oilfields. One of these methods, low-salinity enhanced oil recovery (EOR) has shown promise, however the fundamental underlying chemistry requires elucidating. Here, three mechanisms proposed to account for low-salinity enhanced oil recovery in sandstone reservoirs are investigated using molecular dynamic simulations. The mechanisms probed are electric double layer expansion, multicomponent ionic exchange and pH effects arising at clay mineral surfaces. Simulations of smectite basal planes interacting with uncharged non-polar decane, uncharged polar decanoic acid and charged Nadecanoate model compounds are used to this end. Various salt concentrations of NaCl are modelled: 0% , 1% , 5% and 35% to determine the role of salinity upon the three separate mechanisms. Furthermore, the initial oil/water-wetness of the clay surface is modeled. Results show that electric double layer expansion is not able to fully explain the effects of low-salinity enhanced oil recovery. The pH surrounding a clays basal plane, and hence the protonation and charge of acid molecules is determined to be one of the dominant effects driving low-salinity EOR. Further, results present that the presence of calcium cations can drastically alter the oil wettability of a clay ⇤To whom correspondence should be addressed mineral surface. Replacing all divalent cations with monovalent cations through multicomponent cation exchange dramatically increases the water wettability of a clay surface, and will increase EOR.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Dynamic Simulations of Montmorillonite–Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Kaolinites and illites are non-swelling clays that tend to detach from the rock surface and migrate when the colloidal conditions are conducive for release. The migrating particles can get trapped in pore throats, thus causing a reduction in permeability (Mohan et al, 1993). This is generally observed for the samples with a large fracture apertures (greater than 40 Am) (BarakaLokmane, 2002), where the values of liquid permeability are lower than the values of the gas permeability; this is explained by the presence of the clay minerals within the fracture aperture, which are responsible for the reduction of the water flow rate.…”

Section: Migration Of Clay Particlesmentioning

confidence: 94%

“…Much work has been carried out to study the formation damage in sandstone (Mungan, 1965;Khilar et al, 1983;Khilar and Fogler, 1984;Mohan et al, 1993;Rahman et al, 1995;Civan, 2000;De Lima and Niwas, 2000). The experiments conducted by Mohan et al (1993) and Mohan and Fogler (1997) have shown that the critical salt concentration (CSC) of sodium chloride needed to prevent damage is between 4 and 5 M for Stevens sandstone and 0.07 M for Berea sandstone. According to the studies reported above, the brine used in the experiments was 9% NaCl brine, with a density of 1.067 g/cm 3 and a viscosity at 20 jC of 1.31 cP.…”

Section: Determination Of the Hydraulic And Pneumatic Parametersmentioning

confidence: 99%

“…Strongly hydrophilic minerals, particularly swelling clays can be important in controlling the liquid permeability (Mungan, 1965;Sampath and Keighin, 1982;Khilar et al, 1983;Khilar and Fogler, 1984;Bitton and Gerba, 1984;Appelo and Postma, 1993;Mohan et al, 1993;Rahman et al, 1995;Bloomfield and Williams, 1995;De Lima and Niwas, 2000;Civan, 2000). Smectites can swell with changing ionic conditions and eventually disperse and migrate with the Table 3 Scatter of liquid -gas permeability data from the literature…”

Section: Migration Of Clay Particlesmentioning

confidence: 99%

See 1 more Smart Citation

Hydraulic versus pneumatic measurements of fractured sandstone permeability

Baraka-Lokmane

2002

Journal of Petroleum Science and Engineering

View full text Add to dashboard Cite

Frictional stability‐permeability relationships for fractures in shales

et al. 2017

View full text Add to dashboard Cite

There is wide concern that fluid injection in the subsurface, such as for the stimulation of shale reservoirs or for geological CO2 sequestration (GCS), has the potential to induce seismicity that may change reservoir permeability due to fault slip. However, the impact of induced seismicity on fracture permeability evolution remains unclear due to the spectrum of modes of fault reactivation (e.g., stable versus unstable). As seismicity is controlled by the frictional response of fractures, we explore friction‐stability‐permeability relationships through the concurrent measurement of frictional and hydraulic properties of artificial fractures in Green River shale (GRS) and Opalinus shale (OPS). We observe that carbonate‐rich GRS shows higher frictional strength but weak neutral frictional stability. The GRS fracture permeability declines during shearing while an increased sliding velocity reduces the rate of permeability decline. By comparison, the phyllosilicate‐rich OPS has lower friction and strong stability while the fracture permeability is reduced due to the swelling behavior that dominates over the shearing induced permeability reduction. Hence, we conclude that the friction‐stability‐permeability relationship of a fracture is largely controlled by mineral composition and that shale mineral compositions with strong frictional stability may be particularly subject to permanent permeability reduction during fluid infiltration.

show abstract

Water sensitivity of sandstones containing swelling and non-swelling clays

Cited by 37 publications

References 29 publications

Molecular Dynamic Simulations of Montmorillonite–Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery

Molecular Dynamic Simulations of Montmorillonite–Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery

Hydraulic versus pneumatic measurements of fractured sandstone permeability

Frictional stability‐permeability relationships for fractures in shales

Contact Info

Product

Resources

About