Deformation behavior of a regional shale formation from integrated laboratory and well data analysis: insights for underground fluid storage in northern Italy

Benetatos, Christoforos; Rocca, Vera; Verga, Francesca; Adinolfi, L. A.; Marzano, Francesco

doi:10.1016/j.geoen.2023.212109

Cited by 4 publications

(4 citation statements)

References 44 publications

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“…Figure 6a also shows the interpolating function of the regression data of σcβw. The function is a second-order polynomial (parabola), which is used for the calculation of the mud pressure with Equation (6). The minimum of the parabola occurs close to βw = 40°.…”

Section: Interpretation Of Laboratory Tests On Tournemire Shalementioning

confidence: 99%

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Sensitivity Analysis of Wellbore Mud Pressure towards Anisotropic Shale Properties, Pore Fluid Pressure and Far Field Stresses

Deangeli,

Liu,

Yang

2023

Applied Sciences

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The paper investigates the mud pressure to maintain the stability of wellbores drilled in transversely isotropic shale through sensitivity analyses, carried out with analytical and numerical modeling (FLAC). To this end, we interpreted the anisotropic strength of the Tournemire shale with the Weakness Plane Model (WPM) and the modified Hoek–Brown criterion (HBm). The sensitivity analyses of synthetic case studies indicated a different trend in mud pressure for the two criteria. In some cases, the WPM predicts mud pressures higher than those predicted by the HBm and vice versa. The mud pressures predicted by the HBm resulted in being more sensitive to the increase in the anisotropy of the far field stresses for all the inclinations of the weakness planes. In this context, the WPM predicts some anomalous low mud pressures in a wide range of inclinations of the weak planes. The change in the frictional component of strength decreases with an increase in the pore fluid pressure for both criteria. The mud pressure predicted by the WPM resulted in being more sensitive to the change in frictional strength. The change in trend of the two criteria with change in input data suggests caution in the “a priori” selection of the strength criterion. A simple solution is proposed to predict a safe and reliable mud pressure with a small number of lab tests.

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Section: Interpretation Of Laboratory Tests On Tournemire Shalementioning

confidence: 99%

“…Currently, the mitigation of the effects of anthropogenic greenhouse gas emissions should lead to oil and gas output being in gradual decline. However, depleted oil and gas fields are good targets for CO 2 and H 2 storage [4][5][6][7]. In these depleted fields, new wellbores must be drilled for gas injection operations.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Wellbore Mud Pressure towards Anisotropic Shale Properties, Pore Fluid Pressure and Far Field Stresses

Deangeli,

Liu,

Yang

2023

Applied Sciences

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“…A significant step in the workflow involves the rock mechanical characterization that is performed through the analysis of the sonic log data that are converted to dynamic Young's modulus values that are specific to the different lithologies and to various depths. The same approach is also followed by Benetatos et al (2023b) to calculate the mechanical properties of the Argille del Santerno Fm. They used well log data and compared them to those derived from laboratory analysis of core samples.…”

Section: Uoimentioning

confidence: 99%

Subsurface geological and geophysical data from the Po Plain and the northern Adriatic Sea (north Italy)

Livani,

Petracchini,

Benetatos

et al. 2023

Earth Syst. Sci. Data

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Abstract. The Po Plain (Italy) is one of the most densely populated and productive regions of Europe, characterized by a flourishing economy (also linked to strategic subsurface resources) and several world cultural and natural heritage sites. The coupling of socio-economic interests with geological hazards (i.e. seismic, subsidence, and flooding hazards) in this area requires accurate knowledge of the subsurface geology, the active geological processes, and the impact of human activities on natural environments to mitigate the potential natural and anthropic risks. Most data unveiling the subsurface geology of this region were produced by the hydrocarbon exploration industry. Indeed, the Po Plain hosts many hydrocarbon fields that have been discovered since the early 1950s, giving rise to the subsurface exploration through extensive seismic reflection surveys and drilling of numerous deep wells. In this work, geological and geophysical data from 160 deep wells drilled for hydrocarbon exploration and/or exploitation purposes in the Po Plain and in the facing northern Adriatic Sea have been collected and digitized along with several published geological cross-sections and maps. These data have been used to reconstruct the overall subsurface 3D architecture and to extract the physical properties of the subsurface geological units. The digitized data are suitable to be imported into geo-software environments so as to derive the geophysical and mechanical properties of the geological units for a wealth of applied and scientific studies such as geomechanical, geophysical, and seismological studies. The integrated dataset may represent a useful tool in defining regional first-order strategies to ensure the safety of the urbanized areas and human activities and to reduce natural and anthropic risks that may affect this crucial region of Europe. In particular, the data collected would be useful to highlight sensible areas where data collection and more detailed studies are needed. Nowadays, such issues are particularly relevant for the underground industry development related to the increasing interest in possible CO2 and hydrogen underground storage, which can play a fundamental role in the energy transition process towards decarbonization goals. The full dataset is available at the following link: https://doi.org/10.5281/zenodo.8126519 (Livani et al., 2023).

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“…In this paper, we do not aim to demonstrate the overall feasibility of hydrogen storage, which requires not only the mandatory assessments for any fluid storage (recalled above) but also substantial laboratory work and multidisciplinary studies as it is emerging from the recent scientific literature [4,[7][8][9][10][11][12][13]. Here, we focus on the evaluation of possible hydrogen diffusion through the caprock.…”

Section: Introductionmentioning

confidence: 99%

Underground Hydrogen Storage Safety: Experimental Study of Hydrogen Diffusion through Caprocks

Salina Borello,

Bocchini,

Chiodoni

et al. 2024

Energies

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Underground Hydrogen Storage (UHS) provides a large-scale and safe solution to balance the fluctuations in energy production from renewable sources and energy consumption but requires a proper and detailed characterization of the candidate reservoirs. The scope of this study was to estimate the hydrogen diffusion coefficient for real caprock samples from two natural gas storage reservoirs that are candidates for underground hydrogen storage. A significant number of adsorption/desorption tests were carried out using a Dynamic Gravimetric Vapor/Gas Sorption System. A total of 15 samples were tested at the reservoir temperature of 45 °C and using both hydrogen and methane. For each sample, two tests were performed with the same gas. Each test included four partial pressure steps of sorption alternated with desorption. After applying overshooting and buoyancy corrections, the data were then interpreted using the early time approximation of the solution to the diffusion equation. Each interpretable partial pressure step provided a value of the diffusion coefficient. In total, more than 90 estimations of the diffusion coefficient out of 120 partial pressure steps were available, allowing a thorough comparison between the diffusion of hydrogen and methane: hydrogen in the range of 1 × 10−10 m2/s to 6 × 10−8 m2/s and methane in the range of 9 × 10−10 m2/s to 2 × 10−8 m2/s. The diffusion coefficients measured on wet samples are 2 times lower compared to those measured on dry samples. Hysteresis in hydrogen adsorption/desorption was also observed.

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Deformation behavior of a regional shale formation from integrated laboratory and well data analysis: insights for underground fluid storage in northern Italy

Cited by 4 publications

References 44 publications

Sensitivity Analysis of Wellbore Mud Pressure towards Anisotropic Shale Properties, Pore Fluid Pressure and Far Field Stresses

Sensitivity Analysis of Wellbore Mud Pressure towards Anisotropic Shale Properties, Pore Fluid Pressure and Far Field Stresses

Subsurface geological and geophysical data from the Po Plain and the northern Adriatic Sea (north Italy)

Underground Hydrogen Storage Safety: Experimental Study of Hydrogen Diffusion through Caprocks

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