Nonlinear waves in porous media saturated with live oil

Dunin, S. Z.; Nikolaevskiĭ, V. N.

doi:10.1134/1.2133954

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…Such effects are, however, only consequential at very high intensities. Dunin and Nikolaevskii 45 and Nikolaevskii and Stepanova 8 proposed a theory on the generation of ultrasonic waves as consequence of nonlinear effects associated with seismic and low frequency acoustic action in fluid saturated porous media. They claim that the attenuation and dispersion of seismic waves in porous or fractured porous media introduces additional vibration modes at much higher frequency ͑dominant frequencies͒.…”

Section: Literaturementioning

confidence: 99%

Immiscible displacement of oil by water in consolidated porous media due to capillary imbibition under ultrasonic waves

Hamida

Babadagli

2007

The Journal of the Acoustical Society of America

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Numerous studies done in the last four decades have demonstrated that acoustic stimulation may enhance recovery in oil reservoirs. This technology is not only technically feasible, but also serves as an economical, environmentally friendly alternative to currently accepted enhanced oil recovery (EOR) method. It requires low capital expenditure, and yields almost immediate improvement without any additional EOR agents. Despite a vast body of empirical and theoretical support, this method lacks sufficient understanding to make meaningful and consistent engineering predictions. This is in part due to the complex nature of the physical processes involved, as well as due to a shortage of fundamental/experimental research. Much of what the authors believe is happening within acoustically stimulated porous media is speculative and theoretical. This paper focuses on the effects of ultrasound on the interfacial forces between immiscible fluids. Capillary (spontaneous) imbibition of an aqueous phase into oil (or air)-saturated Berea sandstone and Indiana limestone samples experiments were conducted. Solutions of water, brine (15,000 and 150,000 ppm NaCl), anionic surfactant (sodium dodecyl diphenyloxide disulfonate), nonionic surfactant (alcohol ethoxylate) and polymer (xanthan gum) were prepared as the aqueous phase. Both counter-current and co-current geometries were tested. Due to the intrinsically unforced, gentle nature of the process, and their strong dependence on wettability, interfacial tension, viscosity and density, such experiments provide valuable insight into some of the governing mechanisms behind ultrasonic stimulation.

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Section: Literaturementioning

confidence: 99%

Immiscible displacement of oil by water in consolidated porous media due to capillary imbibition under ultrasonic waves

Hamida

Babadagli

2007

The Journal of the Acoustical Society of America

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“…Such effects are however only consequential at very high intensities. Dunin and Nikolaevskii [45] and Nikolaevskii and Stepanova [8] proposed a theory on the generation of ultrasonic waves as consequence of nonlinear effects associated with seismic and low frequency acoustic action in fluid saturated porous media. They claim that the attenuation and dispersion of seismic waves in porous or fractured porous media introduces additional vibration modes at much higher frequency (dominant frequencies).…”

Section: Spe-106521-stu (Student 5)mentioning

confidence: 99%

The Influence of Ultrasonic Energy on Capillary Fluid Displacement

Hamida

2006

SPE Annual Technical Conference and Exhibition

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In recent years, field tests and laboratory investigations have demonstrated that high intensity acoustic stimulation may enhance oil recovery in rocks. This technology is not only technologically feasible, but also serves as an economical, environmentally friendly alternative to currently accepted EOR methods. It requires low capital expenditure, and yields almost immediate improvement without any additional EOR agents. Despite a vast body of empirical and theoretical support, this technology lacks sufficient understanding to make meaningful, consistent engineering predictions. This is in part due to the complex nature of the physical processes involved, as well as due to a shortage of fundamental/experimental research. Much of what we believe is happening within ultrasonically stimulated porous media is speculative and theoretical.This paper aims at identifying and analyzing the influence of high-frequency, high-intensity ultrasonic radiation on the miscible and immiscible displacement of oil in capillary media. We first investigate the effect of ultrasound on flow through a capillary via the pendant drop method. Water was injected into a capillary which is submersed into various processed mineral oils and kerosene. The average drop rate per minute was measured at several ultrasonic intensities, and we determined that there exists a peak drop rate at a characteristic intensity, which strongly depends on oil viscosity and the interfacial tension between water and the oil. The second set of experiments comprises of Hele-Shaw type experiments designed to study instabilities at liquid-liquid interface when ultrasound is applied. Fractal analysis techniques were used to quantify the degree of fingering and branching, allowing a rough assessment of the degree of perturbation generated at the interface. Miscible Hele-Shaw experiments are also presented to illustrate the effect of viscous forces alone. We found that ultrasound acts to stabilize the interfacial front, and that such effect is most pronounced at low viscosity ratios. The third series of experiments focuses on the effect of ultrasound on spontaneous (capillary) imbibition of an aqueous phase into oil-saturated Berea sandstone and Indiana limestone plugs. Both counter-current and co-current geometries were tested. Due to the intrinsically unforced, gentle nature of the process, and their strong dependence on wettability, interfacial tension, viscosity and density, such experiments provide valuable insight into some of the governing mechanisms behind ultrasonic stimulation.

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“…where  and N are constants. Experimental evidence indicated that the existence of gas bubbles in the saturated porous medium changes the characteristics of this medium [11]- [13], acoustic properties and the velocity of the wave. As Nikolaevskiy pointed out [10], in rocks saturated with fluids, the P1-wave is the only observable wave.…”

Section: Introductionmentioning

confidence: 99%

“…However, the presence of gas, even in small proportion can affect the wave type [14], so that P2-wave may be visible. Dunin et al studied [11] the effect of gas bubbles on the P1-and P2-waves. They found that the dispersion curve of the P2-wave consists of two branches: a low-frequency branch and a high-frequency branch.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rheology with Gas Bubbles on Linear Elastic Waves in Fluid-Saturated Granular Media

Ali

Strunin

2018

International Journal of Applied Mechanics and Engineering

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Elastic waves in fluid-saturated granular media depend on the grain rheology, which can be complicated by the presence of gas bubbles. We investigated the effect of the bubble dynamics and their role in rheological scheme, on the linear Frenkel-Biot waves of P1 type. For the wave with the bubbles the scheme consists of three segments representing the solid continuum, fluid continuum and bubbles surrounded by the fluid. We derived the Nikolaevskiy-type equation describing the velocity of the solid matrix in the moving reference system. The equation is linearized to yield the decay rate λ as a function of the wave number k. We compared the λ (k) -dependence for the cases with and without the bubbles, using typical values of the input mechanical parameters. For both the cases, the λ(k) curve lies entirely below zero, which implies a global decay of the wave. We found that the increase of the radius of the bubbles leads to a faster decay, while the increase in the number of the bubbles leads to slower decay of the wave.

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Nonlinear waves in porous media saturated with live oil

Cited by 10 publications

References 1 publication

Immiscible displacement of oil by water in consolidated porous media due to capillary imbibition under ultrasonic waves

Immiscible displacement of oil by water in consolidated porous media due to capillary imbibition under ultrasonic waves

The Influence of Ultrasonic Energy on Capillary Fluid Displacement

The Effect of Rheology with Gas Bubbles on Linear Elastic Waves in Fluid-Saturated Granular Media

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