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Silica nanoparticles as a high-performance filtrate reducer for foam fluid in porous media
Qichao Lv,Zhaomin Li,Binfei Li,Dashan Shi,Chao Zhang,Binglin Li 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
During the fracturing operations for oils and gases, not only the oil and gas reservoirs, but also the nearbycivil aquifers are often polluted by the invasion of fracturing fluid filtrates. In this study, we investigatedthe potential of silica nanoparticles as a high-performance filtrate reducer for a foam fluid in a porousmedia. First, the three factors affecting filtration reduction using nanoparticles, i.e., surface rheology,foam slipping, and foam stability, were described. Then, the foam filtration through a porous media inthe core was measured using a dynamic fluid-loss device, and the effects of foam quality, pressure drop,and core permeability on the performance of the filtrate reducer were evaluated. The difficulty ofbubbles flowing from a throat to a pore in a porous media was described by resistance gradientcoefficient Cf, which is a combination of surface tension and viscoelastic modulus and increases byadding nanoparticles. Nanoparticles improve the roughness of the SiO2/sodium dodecyl benzenesulfonate foam film surface, thus increasing the slipping resistance Fslip when foams flowon the wall of athroat in a porous media. For the foams in a porous media, the diffusion of bubbles decreased in thepresence of nanoparticles, and the growth rate of gas bubble size also decreased, thus increasing thefoam resistance to gas channeling. The results of core filtration tests indicate that the fluid-loss-controlproperties increased with foam quality ranging from 0 to 85%, and the negative effects of pressure dropand permeability increase to foam filtration were weakened by adding SiO2 nanoparticles. Thus, silicananoparticles can be used as a high-performance filtrate reducer for a foam fluid in a porous media.
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