Nonlinear seismics and the acoustic action on the oil recovery from an oil pool

Nikolaevskiĭ, V. N.; Stepanova, G. S.

doi:10.1134/1.2133961

Cited by 19 publications

(12 citation statements)

References 16 publications

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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%

“…As a consequence, most research in recent years has shifted to low energy, low frequency waves that can propagate several kilometers into the reservoir. Nevertheless, because dispersion of low frequency waves within porous media forms high-frequency harmonics (ultrasonic noise) one still expects ultrasonic waves to be present in the reservoir [7,8]. Additionally, because of its very…”

Section: Introductionmentioning

confidence: 99%

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Ultrasonic Energy on Capillary Fluid Displacement

Hamida

2006

SPE Annual Technical Conference and Exhibition

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“…In seismicity, a different situation has been observed experimentally, described in [12]. Low-frequency vibration excitation on the earth beds generates ultrasound.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear interaction of elastic waves in solid porous material under the condition of phase-group synchronism

Ерофеев¹,

Dar’enkov²,

Plekhov³

et al. 2016

J. vibroeng.

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Nonlinear interaction of quasiharmonic longitudinal waves, which propagate in solid porous material, was investigated theoretically. It was shown that as a result of such interaction between low-frequency waves (vibration field) and high-frequency waves (ultrasound) an ultrasound wave of summarized frequency would be generated. This newly generated wave can be in a phase-group synchronism with the vibration field. Analytical analysis qualitatively agrees with experimental data of ultrasound generation through seismic load.

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“…Nevertheless, because dispersion of low frequency waves within porous media forms high frequency harmonics ͑ultrasonic noise͒ one still expects ultrasonic waves to be present in the reservoir. 7,8 Additionally, because of its very short wavelength, ultrasound may be more influential on the capillary dynamics within a pore than large wavelength alternatives, which dominate in the bulk response of the rock.…”

Section: Introductionmentioning

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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Nonlinear seismics and the acoustic action on the oil recovery from an oil pool

Cited by 19 publications

References 16 publications

The Influence of Ultrasonic Energy on Capillary Fluid Displacement

The Influence of Ultrasonic Energy on Capillary Fluid Displacement

Nonlinear interaction of elastic waves in solid porous material under the condition of phase-group synchronism

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

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