Simultaneous determination of the effective stress coefficients for permeability and volumetric strain on a tight sandstone

Nolte, Steffen; Fink, Reinhard; Krooß, Bernhard M.; Littke, Ralf

doi:10.1016/j.jngse.2021.104186

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…Equations (10) and (11) illustrate that the Biot's coefficient is a key parameter controlling the influence of SF on the effective stress field of rocks. Multiple recent studies have been carried out to measure and determine the Biot coefficient of rocks, 50,51 while the focus of this paper is intended to explore the impact of SF on HF initiation under the control of Biot's coefficient. Since the values of Biot coefficients of different unconventional formations are quite varied, based on the measurement results of some previous studies, 51–53 we selected the Biot coefficient range from 0.2 to 1.…”

Section: Resultsmentioning

confidence: 99%

“…Multiple recent studies have been carried out to measure and determine the Biot coefficient of rocks, 50,51 while the focus of this paper is intended to explore the impact of SF on HF initiation under the control of Biot's coefficient. Since the values of Biot coefficients of different unconventional formations are quite varied, based on the measurement results of some previous studies, 51–53 we selected the Biot coefficient range from 0.2 to 1. Figure 11 demonstrates the comparison of FIP for different fluid viscosity and Biot's coefficient.…”

Section: Resultsmentioning

confidence: 99%

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Mechanistic study on the effect of seepage force on hydraulic fracture initiation

Wang,

Zhou

2024

Fatigue Fract Eng Mat Struct

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The flow of fracturing fluid through rock pores generates a seepage force (SF) that disrupts the existing stress equilibrium and significantly affects rock deformation and failure. Despite its impact, the effect of SF on hydraulic fracture (HF) initiation has yet to be fully understood. In this study, a mechanistic model of SF's impact on fracture initiation was established through analysis of the force balance on a microscopic element. Using the finite difference method, a transient hydro‐mechanical model was developed to simulate fluid seepage‐induced stress distribution and pore pressure variation around a wellbore. Model results were validated through comparison with an analytical solution of pore pressure. The influence of SF on fracture initiation was investigated by conducting simulations with various wellbore pressurization rates and fracturing fluid viscosities. The results showed that fluid viscosity and pressurization rate have a significant impact on fracture initiation pressure (FIP) and SF‐induced circumferential stress. A larger SF‐induced circumferential stress and a lower FIP were observed when the viscosity and pressurization rate were smaller. A higher Biot coefficient results in stronger SF and reduced FIP. The theoretical mechanical model of seepage force established in this paper can provide crucial theoretical support for understanding the mechanism of fracture initiation and propagation, as well as for optimizing the effectiveness of hydraulic fracturing construction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mechanistic study on the effect of seepage force on hydraulic fracture initiation

Wang,

Zhou

2024

Fatigue Fract Eng Mat Struct

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“…Analytical fitting models frequently employed are power law, (Ghabezloo, Sulem, Guédon, & Martineau, 2009), exponential David et al (1994), Nolte et al (2021) and Wang et al (2018) and polynomial Zhao et al (2011). In this work, a linear model 9.…”

Section: Permeability Data Fitting In Terms Of Effective Stress σ'mentioning

confidence: 99%

Experimental Bedford limestone permeability dependence on confining stress and pore pressure. A comparative study with previous works

Domínguez Torres,

Serrano Saldaña,

Coronado

et al. 2024

Geofis Int

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El impacto de los cambios en el estado del esfuerzo de confinamiento y de la presión de poro sobre la permeabilidad de una roca es muy importante en la explotación de yacimientos de petróleo, particu- larmente los cambios por la disminución de la presión del yacimiento durante la extracción de hidro- carburos. A lo largo de los años, se han realizado numerosos estudios experimentales con muestras de núcleos que han mostrado una amplia gama de respuestas. En el presente estudio, se analizó dicho efecto en una muestra de roca caliza Bedford. Se investigan dos modos diferentes de confinamiento, hidrostático y no hidrostático. Los datos de permeabilidad obtenidos de los experimentos se ajustan a modelos comúnmente utilizados basados en el esfuerzo de confinamiento, la presión de poro y el esfuerzo efectivo. Los resultados indican que los modelos lineales ofrecen un ajuste satisfactorio en ambos modos de confinamiento. Se observa un coeficiente efectivo de presión relativamente grande de 5.78 en el modo hidrostático, mientras que se encuentra un inusual valor negativo de -1.63 en el modo no hidrostático. Estos resultados se examinaron en el contexto de los datos de permeabilidad y modelos de ajuste publicados. Para facilitar este análisis, se elaboraron tablas completas que integran la información disponible de la literatura sobre experimentos de permeabilidad en areniscas y calizas.

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“…To achieve this, rock samples are tested under laboratory conditions using cyclic confining pressure to simulate variations in pore pressure (Yang and Hu, 2018;Lei et al, 2020;Liu et al, 2020;Xin et al, 2021;Wang et al, 2022;Kozhevnikov et al, 2023). Numerous experimental studies have observed that the curves depicting the reduction and restoration of permeability under loading are most accurately represented by power law functions (Li et al, 2014;Zheng et al, 2015;Milsch et al, 2016;Nolte et al, 2021;Stanton-Yonge et al, 2023). Experimental equations may be the most straightforward approach to model permeability.…”

Section: Introductionmentioning

confidence: 99%

Rock permeability evolution during cyclic loading and colloid migration after saturation and drying

Kozhevnikov,

Turbakov,

Riabokon

et al. 2024

Adv. Geo-Energy Res.

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The study of the influence of cyclic loading on the permeability of rocks has been conducted for a long time. Despite the extensive research database, the actual reasons for the decrease in permeability during loading have not been fully revealed. One of these reasons, as described in the research, is the migration of colloids. This paper presents the findings of a study on colloid migration as one of the causes of permeability degradation in porous rocks under cyclic loading. Permeability is measured by injecting nitrogen at a constant pressure. The cyclic loading program is designed to eliminate the effects of residual deformations, creep, and gas slippage. Direct and reverse nitrogen blowings with increased injection pressure were performed between loading cycles. These blowings promote colloidal movement within the porous medium, blocking pore throats and changes in permeability. A notable aspect of this work is that cyclic testing was performed before and after the saturation and drying procedure. Stuck colloids that cannot be moved by blowing are mobilized during saturation and drying. Comparative tests of cores after saturation and drying confirm the effect of colloid migration on permeability and enable the examination of whether plastic deformations caused permeability degradation in previous loading cycles. Additionally, it was observed that when saturated, new colloids can detach due to the Rehbinder effect, significantly reducing permeability.

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Simultaneous determination of the effective stress coefficients for permeability and volumetric strain on a tight sandstone

Cited by 21 publications

References 33 publications

Mechanistic study on the effect of seepage force on hydraulic fracture initiation

Mechanistic study on the effect of seepage force on hydraulic fracture initiation

Experimental Bedford limestone permeability dependence on confining stress and pore pressure. A comparative study with previous works

Rock permeability evolution during cyclic loading and colloid migration after saturation and drying

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