Apparatus to determine static and dynamic elastic moduli

Howarth, D.F.

doi:10.1007/bf01032338

Cited by 17 publications

(10 citation statements)

References 14 publications

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“…The unjacketed modulus K s is not significantly influenced by w/c ratio, but this influence is more significant on the modulus K φ which shows an increasing trend with w/c ratio. Figure It is well-known that the dynamic elastic properties of geomaterials, particularly at saturated state, are significantly higher than the static ones [63][64] [65][66][67] [68]. Different empirical relations between the dynamic and the static elastic moduli of geomaterials are proposed in the literature.…”

Section: Effect Of Water-to-cement Ratio On Poroelastic Propertiesmentioning

confidence: 99%

Association of macroscopic laboratory testing and micromechanics modelling for the evaluation of the poroelastic parameters of a hardened cement paste

Ghabezloo

2010

Cement and Concrete Research

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International audienceThe results of a macro-scale experimental study performed on a hardened class G cement paste [Ghabezloo et al. (2008) Cem. Con. Res. (38) 1424-1437] are used in association with the micromechanics modelling and homogenization technique for evaluation of the complete set of poroelastic parameters of the material. The experimental study consisted in drained, undrained and unjacketed isotropic compression tests. Analysis of the experimental results revealed that the active porosity of the studied cement paste is smaller than its total porosity. A multi-scale homogenization model, calibrated on the experimental results, is used to extrapolate the poroelastic parameters to cement pastes prepared with different water-to-cement ratio. The notion of cement paste active porosity is discussed and the poroelastic parameters of hardened cement paste for an ideal, perfectly drained condition are evaluated using the homogenization model

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Section: Effect Of Water-to-cement Ratio On Poroelastic Propertiesmentioning

confidence: 99%

Association of macroscopic laboratory testing and micromechanics modelling for the evaluation of the poroelastic parameters of a hardened cement paste

Ghabezloo

2010

Cement and Concrete Research

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“…The rock mechanical properties are not directly obtained from logging tools but can be derived from well log data or obtained from laboratory test (Ameen et al 2009). The properties determined from well log data are called dynamic properties while those obtained from stress-strain laboratory measurements are referred to as static constant (Howarth 1984). In situ log measurements represent continuous profile of the formation strength (Hsieh et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Modified approach for identifying weak zones for effective sand management

Sulaimon

Teng

2019

J Petrol Explor Prod Technol

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Sand production is a major problem that the oil and gas industry has been facing for years. It can lead to loss of production, equipment damage or complete well abandonment. Prediction of sand has been historically challenging due to the periodic nature of sand production, insufficient laboratory tests and lack of field tests validation. Analyses have been performed to identify weak zones for planned wells, and common technique is the application of shear modulus and mechanical properties log (MPL) criteria developed by Tixier et al. (J Pet Technol 27:283-293, 1975). However, the set criteria have been found to be generally inadequate to detect transition zone or predict weak formation in some fields. In this study, using the knowledge of rock behavior, geomechanical properties and well log data, we have established new simple criteria for identifying fragile sections within a transition zone. In situ logging data from a field X, located in Sabah, Malaysia, and Field Y, located in Shimokita, Japan, were used in this study. Using the threshold for shear modulus and MPL, the criteria for the geomechanical properties are set to differentiate formation strengths at different depths. The threshold for Poisson's ratio is 0.34, Young's modulus at 1.6 × 10 6 psi and the unconfined compressive strength at 2400 psi. The MPL and geomechanical models were generated to predict sanding incident. The results were subsequently validated with artificial neural network using MATLAB. Also, critical wellbore pressure is calculated and acts as a guide to operate outside the sand failure envelope. Thus, the prediction of the weak formation using geomechanical properties has been further established in this study.

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“…Consequently, tensile stress creates in the center. Eventually, the rock specimen will split into segments at failure [1,12,[17][18][19].…”

Section: Static Methods (Direct)mentioning

confidence: 99%

Review of Mechanical Rock Properties Measurement and Estimation Techniques

Issa

Abdulkareem

et al. 2022

IJAEFEA

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At the wellbore, the majority of mechanical rock characteristics are not immediately measured. Therefore, it is crucial to establish these characteristics employing measurable data from well logs and core samples. With this decision, numerous drilling and production difficulties over the well's life might possibly be reduced. These properties are classified into the strength parameters (rock cohesiveness, friction angle, and unconfined compressive strength of the rock) and the elastic parameters (bulk and shear moduli, Poisson's ratio, and Young's modulus). This article includes a complete review of the mechanical rock properties and their impacts on the rocks. Also, the measurement techniques (static and dynamic) of these properties were explained, and the worldwide empirical correlations for different lithologies were inserted in order to determine the static profiles of the mechanical rock properties. Lastly, this study can be used as a reference or guideline for any application related to geomechanics.

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Apparatus to determine static and dynamic elastic moduli

Cited by 17 publications

References 14 publications

Association of macroscopic laboratory testing and micromechanics modelling for the evaluation of the poroelastic parameters of a hardened cement paste

Association of macroscopic laboratory testing and micromechanics modelling for the evaluation of the poroelastic parameters of a hardened cement paste

Modified approach for identifying weak zones for effective sand management

Review of Mechanical Rock Properties Measurement and Estimation Techniques

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