Acoustic reverberation in a logging tool-borehole-saturated porous medium system

Markov, A.; Markov, M.; Jarillo, G. Ronquillo; Sadovnychiy, Sergiy

doi:10.1134/s1069351314020050

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…This effect was also observed by and when comparing samples with different moisture content. In addition, the presence of water in the pores of the material may still result in a decrease in the ultrasonic wave amplitude (Bernat-Maso et al, 2017;Mansour et al, 2016;Markov et al, 2014).…”

Section: Nondestructive Testingmentioning

confidence: 99%

Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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The elastic constants obtained through conventional destructive (triaxial and resilience) tests can present great variability, even for soils with the same classification. Thus, a test is necessary to determine the elastic constants of soils in a reliable and replicable way. The ultrasonic technique is used to characterize rock and several construction materials (wood, cementitious matrices, metals), including the elastic parameters (elastic modulus, shear modulus, and Poisson's ratio). The aim of this study was to verify the correlation between the elastic modulus obtained through ultrasonic testing and through a simple unconfined compression test on compacted clayey soil. Test specimens were molded at normal compression energy with three moisture contents; the specimens were exposed to air and packed with plastic wrap for 120 days. After this period, we performed ultrasonic and compression tests. The technique presented great potential to study the mechanical behavior, with correlation coefficients over 0.97 for both parameters (compressive strength and static elastic modulus). We also verified that the ultrasonic testing is influenced mainly by the moisture content.

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Section: Nondestructive Testingmentioning

confidence: 99%

Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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“…One of the several possible schemes for acoustic measurements destined to register the acoustic wavefield reflected from the borehole wall is described in the works of Markov et al . (2014, 2015). In these works, the authors have evaluated the acoustic reverberation time of a borehole in an elastic or saturated porous medium.…”

Section: Introductionmentioning

confidence: 99%

Impedance loading an acoustic source in a borehole located in a fluid‐saturated porous medium

Markova

Markov

Sabag

et al. 2021

Geophysical Prospecting

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Conventional sonic logging tools are destined mainly for the determination of elastic waves’ velocities. In this paper, we have considered a different type of sonic logging tool that is destined for the registration of parameters of reflected waves in a borehole. We have calculated the mechanical impedance loading an acoustic source located on the axis of a fluid‐filled borehole. The problem was solved for a borehole drilled in a poroelastic formation. The solution was obtained in the framework of the Biot theory of poroelasticity. We have considered two limiting cases with permeable and impermeable (mudcake at the boundary between the borehole and porous rock) borehole wall. We have obtained the frequency dependences of the mechanical impedance. It was shown that the acoustic system ‘logging tool – fluid‐filled borehole – porous rock’ presents several resonance frequencies. These resonances’ frequencies are close to the resonance frequencies of a liquid layer between two rigid cylinders with radii equal to the source and borehole radii. The mechanical impedance calculated at the resonance frequency depends on the porosity and permeability that allows one to use impedance measurements in the frequency range near the resonance to determine the filtration properties of highly permeable rocks (of order higher than 10 mD). We have calculated the mechanical impedance in the low‐frequency range. The results obtained have shown that the use of low‐frequency impedance measurements provides a good way to evaluate the permeability of porous media.

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“…(2014) determined Young's modulus of two kinds of new asphalt materials, and concluded that the vertical of Young's modulus is greater than that of the horizontal. Actually, there are also lots of scholars at home and abroad who have studied the relationship between natural resources and rock mechanics method (Fan et al., 2014; Lee and Bobet, 2014; Liu et al., 2014; Markov et al., 2014; Song and Hu, 2014; Wasantha and Ranjith, 2014; Wu et al., 2014; Yang et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Tang (2014) analyzed wave velocities and modulus of the anisotropic rock under the condition of quasi static and dynamic state, he believed that anisotropic characteristics was related to porosity, compaction history, and particle composition; Nishimura (2014) used a new type of tri-axial test instrument to quantify the small strain of rock material value in high precision, which could help to get more accurate determination of anisotropic Young's modulus; Kongkitkul et al (2014) determined Young's modulus of two kinds of new asphalt materials, and concluded that the vertical of Young's modulus is greater than that of the horizontal. Actually, there are also lots of scholars at home and abroad who have studied the relationship between natural resources and rock mechanics method (Fan et al, 2014;Lee and Bobet, 2014;Markov et al, 2014;Song and Hu, 2014;Wasantha and Ranjith, 2014;Wu et al, 2014;Yang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

New inspiration on effective development of tight reservoir in secondary exploitation by using rock mechanics method

Shi

Guan

et al. 2016

Energy Exploration & Exploitation

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This study attempted to raise new significant inspiration on effective development of tight reservoir in secondary exploitation by using rock mechanics method. After refitting the conventional tri-axial rock mechanics testing instruments, a set of probing experiments on rock mechanics determination were performed. Results show that mechanism of the influence of confining pressure on the Young's modulus is different from that of the pore pressure. The physical significance of the slope and intercept value in Young's modulus changing curves were analyzed; two kinds of mechanisms which cause changes of Young's modulus were raised. Meanwhile, we put forward the concept of ''microscopic'' anisotropy and introduce the coefficient of ''S'' and ''H'' to quantitatively characterize the relative difference on impact extent, where pore pressure and confining pressure could lead to change in Young's modulus and the size of microscopic anisotropy of Young's modulus. We predicted the size of microscopic anisotropy of Young's modulus in Qijiagulong district of Daqing Oilfield by using the above method. The conclusion could provide scientific basis for judging the well pattern adaptability, preponderant direction of water flooding, the reservoir rock fracturing, and optimization design of fracturing parameters.

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Acoustic reverberation in a logging tool-borehole-saturated porous medium system

Cited by 6 publications

References 8 publications

Soil Elastic Modulus Determined by Ultrasound Tests

Soil Elastic Modulus Determined by Ultrasound Tests

Impedance loading an acoustic source in a borehole located in a fluid‐saturated porous medium

New inspiration on effective development of tight reservoir in secondary exploitation by using rock mechanics method

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