An uncertainty quantitative model of wellbore failure risk for underground gas storage in depleted gas reservoir during the construction process

Zhang, Shengyue; Lan, Shi; Jia, Delong

doi:10.1016/j.est.2022.106144

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…Geotechnical engineering challenges various issues related to engineering fields, including mining, civil, and tunnelling engineering [13,14]. The problems are related to underground mines ground stability, foundation design, earthworks, embankments and wellbore stability and tunnelling [15][16][17]. In tunnelling and underground mining, understanding the mechanical properties of rock is paramount for addressing associated challenges [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Abbas,

Li,

Fissha

et al. 2024

The Journal of Engineering

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In this study, efforts were made to incorporate the influence of discontinuities and failure modes of rock into the classification of rock masses. The past tectonic activities may create microfractures in the rock body therefore the failure moods have been determined carefully under uniaxial compression. The results of the discontinuity analysis, conducted through kinematic study, highlighted the significant impact of wedge failure on the failure of the rock mass. In correlating the geological strength index with rock mass rating, it was observed that joint volume played a negative role, whereas compressive strength played a positive role. These correlations are particularly applicable for a certain rock type, as the compressive strength is inherently dependent on the type of rock. The analysis of failure modes under uniaxial compression reveals that the dissipation energy coefficient initially undergoes rapid increase before reaching its minimum value at the failure stage. The microstructures of the rock effect significantly the elastic and dissipation energy characteristics. Specifically, the axial splitting failure mode emerges as predominant. Given the area's past tectonic activity, these results emphasize the impact of microfractures within the rock body. Relating the failure criteria with the chemical composition of rock types reveals that rocks abundant in SiO2, such as gabbronorite, tend to exhibit brittle failure. Additionally, a dominance of Al2O3 over Fe2O3 suggests a predisposition towards brittle failure, while an increased ratio of CaO to MgO implies increased susceptibility to compression.

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Section: Introductionmentioning

confidence: 99%

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Abbas,

Li,

Fissha

et al. 2024

The Journal of Engineering

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“…Hoseinpour and Riahi (2022) presented a mechanical earth modeling (MEM) that analyzes wellbore stability based on failure criteria for optimum drilling trajectory for Iranian hydrocarbon reservoirs. Zhang et al (2023b) provided an uncertainty quantitative model for wellbore instability control, design, and construction of directional wells in depleted gas reservoirs. In the cited previous research, the presentation of a simple wellbore stability model for depleted reservoirs using coupled thermoporo-elastic units needs to be explained more comprehensively.…”

Section: Introductionmentioning

confidence: 99%

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

Pirhadi,

Kianoush,

Ebrahimabadi

et al. 2023

Preprint

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Maintaining wellbore stability in depleted reservoirs is a critical problem. With production from hydrocarbon reservoirs, the pore pressure of the reservoir is reduced over time, and the reservoir is depleted since field development is one of the main purposes for oil companies. Heavy mud weight in depleted reservoir caused fracture due to reduced fracture gradient, and low mud weight caused blow out in high-pressure zone or well collapse due to shale beds that required high mud weight to prevent collapse. Considering geomechanics and coupled equilibrium equation, continuity equation, Hook’s law, compatibility equation, Darcy’s law, and thermal relation, the Thermo-poro-elastic equation was derived in this research. A finite element method has been developed to implement the fully coupled thermo-poro-elastic non-linear models. The finite element model was validated by comparing it to the available analytical solutions for the thermo-poro-elastic wellbore problems in shale. The non-linear thermal-poro-elasticity finite element model was used to analyze wellbore stability in a depleted reservoir during drilling. The numerical results showed that a decrease drilling fluid’s temperature (cooling) causes to increase in the potential for tensile failure and reduces the potential of shear failure. Due to the depletion reservoir, the potential of tensile failure increased than shear failure, so heating the drilling fluid could cause wellbore stability in the depleted reservoir. Furthermore, based on the numerical results, it may be concluded that the drilling fluid’s temperature is one of the important factors in the wellbore stability analysis in depleted reservoirs.

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“…Sci. 2023, 13, 9753 2 of 16 natural gas in depleted gas reservoirs accounts for 90% in China, and their application and distribution are very extensive [13][14][15][16][17][18][19]. However, it should be noted that there are many domestic and international cases of sealing failure of underground gas storage.…”

Section: Introductionmentioning

confidence: 99%

“…In China, depleted gas reservoirs and salt caverns are two main types of space for the underground gas storage. Among them, the storage capacity of natural gas in depleted gas reservoirs accounts for 90% in China, and their application and distribution are very extensive [13][14][15][16][17][18][19]. However, it should be noted that there are many domestic and international cases of sealing failure of underground gas storage.…”

Section: Introductionmentioning

confidence: 99%

The Application of the Fuzzy Comprehensive Evaluation Method in the Sealing Evaluation of Caprocks in Underground Gas Storage

Ban,

Liu,

Wei

et al. 2023

Applied Sciences

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The good sealing caprocks are significant for the integrity of underground gas storage (UGS) in depleted natural gas reservoirs. The screening of parameters, weight assignment, and evaluation method are important for evaluating the sealing performance of caprocks. Many factors can affect the sealing performance of caprocks, including caprock thickness, lithology, brittleness, porosity and permeability, breakthrough pressure, etc. In this paper, the dominant factors in the sealing performance of caprocks in UGSs are systematically analyzed, and the weights of these factors are analyzed by the analytic hierarchy process (AHP). The fuzzy comprehensive evaluation method (FCEM) is applied in the sealing evaluation of caprocks in three typical underground gas reservoirs (i.e., Zhujiadun, Xu-2, and Xing-9) in China. The sandstone reservoir in the Zhujiadun gas field is only about 20 m, and the thickness of the overlying mudstone is about 600 m. The caprock of the Xu-2 gas reservoir in Zhongba gas field is well distributed and developed, and the breakthrough pressure is relatively large. The caprock of Xing-9 gas field is mudstone with a thickness of over 400 m. The results show that the breakthrough pressure and permeability are the key parameters affecting the sealing ability of caprocks, with weights of 0.4291 and 0.2157, respectively. Among these three examples of gas fields, the sealing performance of caprocks in Zhujiadun gas storage is the best. The evaluation procedure and methods proposed in this paper are valuable for the evaluation of the tightness of caprocks in depleted gas reservoirs.

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An uncertainty quantitative model of wellbore failure risk for underground gas storage in depleted gas reservoir during the construction process

Cited by 7 publications

References 43 publications

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

The Application of the Fuzzy Comprehensive Evaluation Method in the Sealing Evaluation of Caprocks in Underground Gas Storage

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