Experimental and theoretical rock physics research with application to reservoirs, seals and fluid processes

Dodds, Kevin J.; Dewhurst, David N.; Siggins, Anthony F.; Číž, Radim; Urošević, Milovan; Gurevich, Boris; Sherlock, Donald H.

doi:10.1016/j.petrol.2005.10.018

Cited by 20 publications

(13 citation statements)

References 40 publications

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“…The anisotropy of the wave velocities, and therefore of the material, develops progressively during the loading due to the preferential closure of pre-existing microcracks and penny-shaped pores which are perpendicular (or almost perpendicular) to the direction of the uniaxial stress and the preferential opening of microcracks parallel to the direction of the applied uniaxial stress. This result is in good agreement with past studies on sandstone (Sayers et al 1990;Scott et al 1993;Fortin et al 2005;Dodds et al 2007), calcite rocks ) and shale (Dewhurst & Siggins 2006;Sarout 2006;Dodds et al 2007;Sarout et al 2007).…”

Section: Evolution Of the Damage During The Uniaxial Loadingsupporting

confidence: 93%

“…This experimental device permits the continuous measurement of elastic wave velocities which is different from similar experiments to be found in specialized literature (e.g. Fortin et al 2005;Dewhurst & Siggins 2006;Sarout 2006;Dodds et al 2007;Sarout et al 2007).…”

Section: Experimental Methodology For the Measurements Of The Velocitmentioning

confidence: 99%

“…However research, both in the laboratory and in situ , has more generally used the measurements of US waves velocities and their attenuation to show the presence of open microcracks and fractures and to monitor the progressive damage of rocks (Sayers & Kachanov 1995). Experimental studies of US wave anisotropy during a mechanical loading include those of Sayers et al (1990), Scott et al (1993), Ayling et al (1995), Fortin et al (2005), Dodds et al (2007) for sandstone, Schubnel et al (2005) for calcite rocks (limestone and marble) and Dewhurst & Siggins (2006), Dodds et al (2007), Sarout (2006) and Sarout et al (2007) for shale. It resulted from these studies that the anisotropy of rocks develops during loading due to the opening of microcracks and no discussion was made on how static and dynamic derived moduli differ during the loading.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the damage of a porous limestone from continuous (P- and S-) wave velocity measurements under uniaxial loading and different hydrous conditions

Eslami¹,

Grgic²,

Hoxha

2010

Geophysical Journal International

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S U M M A R YThe damage of a porous rock (Euville oolitic limestone) was studied through uniaxial stresscycling tests. An experimental device, allowing the simultaneous and continuous measurement of strains (in two perpendicular directions) and five elastic wave hree P waves and two S waves) velocities in two different directions under fully controlled hydrous conditions, was developed for the work presented in this paper. Hence, the damage was monitored in a really precise and continuous way through the evolution of dynamic and static elastic moduli. The evolutions of wave velocities and elastic moduli, which reproduce very remarkably the shape of the stress-strains curves, showed that the limestone, initially isotropic, became progressively anisotropic during uniaxial loading due to microcrack damage. Indeed, even if the creation of microcracks is probably scattered and isotropic before the coalescence of microcracks, as shown in past studies, pre-existing microcracks and penny-shaped pores which are perpendicular (or almost perpendicular) to the uniaxial stress direction closed, whereas axially-oriented microcracks opened. The anisotropy of the damage is completely reversible but some of the damage is irreversible. V P(90 • ) , which cannot record the opening of these microcracks, started to decrease just before the macroscopic failure of the sample and can detect, therefore, very precisely the macroscopic failure of the material. The influence of water on the strength and deformation of the Euville limestone was analysed by considering both the hydromechanical and physio-chemical ('Rehbinder effect', intergranular pressure solution and subcritical cracking) effects of water.

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Section: Evolution Of the Damage During The Uniaxial Loadingsupporting

confidence: 93%

Section: Experimental Methodology For the Measurements Of The Velocitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimation of the damage of a porous limestone from continuous (P- and S-) wave velocity measurements under uniaxial loading and different hydrous conditions

Eslami¹,

Grgic²,

Hoxha

2010

Geophysical Journal International

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“…Laboratory experiments under controlled conditions can help in estimating the effects of these parameters. (Dodds, 2007) Table 1 summarizes the ultrasonic results along with the conditions used to run the test. Three waveforms were produced, one for P-waves and two for S-waves.…”

Section: Ultrasonic Testingmentioning

confidence: 99%

Mitigating Shale Drilling Problems through Comprehensive Understanding of Shale Formations

Alarfaj

Abdulraheem

Sultan

et al. 2015

Day 2 Mon, December 07, 2015

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In order to develop an inhibitive water-based mud capable of mitigating the adverse effects of shale-mud interactions, it is important to characterize the shale sample in terms of its geological structure, mineralogical composition, reactivity potential, etc. Further, the shale-mud interactions should be studied through a series of experimental tests such as swelling, dispersion and inhibition durability.This paper presents the results of characterization and testing of one of the studied shale samples with X-ray diffraction, micro-CT, ultrasonic rock mechanics testing, capillary suction time and cation exchange capacity. The paper also shows how petrophysics data of shale formations can be utilized to improve and optimize drilling practices in order to achieve the ultimate goal of enhanced wellbore stability. Depending on clay content, different shale formations have different responses when exposed to drilling fluids. It is therefore very important to characterize the shale formation to develop the appropriate drilling fluid.The tested shale sample was found to be a silica-rich shale with a small percentage of clay minerals, mainly kaolinite. Characterization scheme included also Micro-CT where the images revealed the heterogeniety and fractures in the internal matrix. Dynamic elastic moduli were determined using ultrasonic rock mechanics testing. A cation exchange capacity (CEC) value of 2.5 meq and capillary suction time (CST) value of 42.6 seconds indicated low tendency of the shale rock to both swelling and dispersion.

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“…Experimental studies of ultrasound wave anisotropy during mechanical loading include those of Scott et al (1993); King et al (1995); Eslami et al (2010); Sayers et al (1990); Fortin et al (2005); Dodds et al (2007); Sarout et al (2007). Several studies have shown how an initially isotropic solid can become progressively anisotropic during uniaxial loading due to microcracking damage.…”

Section: Introductionmentioning

confidence: 99%

Bridging the macro to mesoscale: Evaluating the fourth-order anisotropic damage tensor parameters from ultrasonic measurements of an isotropic solid under triaxial stress loading

Olsen-Kettle

2018

International Journal of Damage Mechanics

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One of the most challenging problems which arises in continuum damage mechanics is the selection of variables to describe the internal damage. Many theories have been proposed and various types of damage variables ranging from scalar to vector to tensor quantities have been used. In this paper we consider anisotropic damage and the most general form for damage by using a fourth order tensor for the damage variables. We demonstrate how experimentally measured quantities can be related to the internal tensorial damage variables. We apply this analysis to experiments of an initially isotropic solid becoming transverse isotropic under triaxial or uniaxial stress loading.

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Experimental and theoretical rock physics research with application to reservoirs, seals and fluid processes

Cited by 20 publications

References 40 publications

Estimation of the damage of a porous limestone from continuous (P- and S-) wave velocity measurements under uniaxial loading and different hydrous conditions

Estimation of the damage of a porous limestone from continuous (P- and S-) wave velocity measurements under uniaxial loading and different hydrous conditions

Mitigating Shale Drilling Problems through Comprehensive Understanding of Shale Formations

Bridging the macro to mesoscale: Evaluating the fourth-order anisotropic damage tensor parameters from ultrasonic measurements of an isotropic solid under triaxial stress loading

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