Spontaneous imbibition in fractal tortuous micro-nano pores considering dynamic contact angle and slip effect: phase portrait analysis and analytical solutions

AbstractThe ultra-low permeability reservoir is regarded as an important energy source for oil and gas resource development and is attracting more and more attention. In this work, the active silica nanofluids were prepared by modified active silica nanoparticles and surfactant BSSB-12. The dispersion stability tests showed that the hydraulic radius of nanofluids was 58.59 nm and the zeta potential was − 48.39 mV. The active nanofluids can simultaneously regulate liquid–liquid interface and solid–liquid interface. The nanofluids can reduce the oil/water interfacial tension (IFT) from 23.5 to 6.7 mN/m, and the oil/water/solid contact angle was altered from 42° to 145°. The spontaneous imbibition tests showed that the oil recovery of 0.1 wt% active nanofluids was 20.5% and 8.5% higher than that of 3 wt% NaCl solution and 0.1 wt% BSSB-12 solution. Finally, the effects of nanofluids on dynamic contact angle, dynamic interfacial tension and moduli were studied from the adsorption behavior of nanofluids at solid–liquid and liquid–liquid interface. The oil detaching and transporting are completed by synergistic effect of wettability alteration and interfacial tension reduction. The findings of this study can help in better understanding of active nanofluids for EOR in ultra-low permeability reservoirs.

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Dynamic contact angle and its relationship to forces of hydrodynamic origin

Journal of Colloid and Interface Science ◽

10.1016/0021-9797(71)90280-3 ◽

1971 ◽

Vol 37 (1) ◽

pp. 196-207 ◽

Cited By ~ 84

Author(s):

R.J Hansen ◽

T.Y Toong

Keyword(s):

Contact Angle ◽

Dynamic Contact Angle ◽

Dynamic Contact

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Effect on Sedimentation Characteristics of Bentonite Suspension at Different Conditions

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.333-335.2004 ◽

2013 ◽

Vol 333-335 ◽

pp. 2004-2009

Author(s):

Lin Ling Jiang ◽

Wei Mo ◽

Xiao Jing Yang ◽

Tian Li Xue ◽

Shao Jian Ma

Keyword(s):

Contact Angle ◽

Dynamic Contact Angle ◽

Dynamic Contact ◽

Sodium Pyrophosphate ◽

Sedimentation Rates ◽

Sedimentation Analysis ◽

Ph Values ◽

Bentonite Suspension ◽

Sedimentation Time ◽

Sedimentation Processes

To better understand the sedimentation processes of bentonite, the sedimentation characteristic of bentonite suspension was studied by using the sedimentation analysis module of Dynamic Contact Angle Meter and Tensiometer. The results indicated that sedimentation characteristics of bentonite suspension were affected by the concentration and pH values of the suspension together with the dosage of dispersants. The natural sedimentation rates of bentonite suspension declined firstly with prolonging the sedimentation time and soon stabilized after about 50s. The sedimentation weight of particles hardly changed when the concentration ranged from 0.5% to 5.0%, while it increased significantly when ranged from 5.0% to 10.0%. The sedimentation weight and rate were relatively bigger at 4.4, 11.8 than that of 6.0, 7.9, and the maximum values appeared at pH11.8. Adding sodium pyrophosphate could improve the dispersibility of bentonite suspension.

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