Parametric study on the integrity of wellbores in CO2 storage sites

Bagheri, Mozhgan; Shariatipour, Seyed M.; Ganjian, Eshmaiel

doi:10.1016/j.conbuildmat.2020.121060

Cited by 6 publications

(2 citation statements)

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“…Models based on the coupling of geochemical and geomechanical changes were developed in order to predict the consequences of the possible losses. The model simulated the change of a rock-cement casing combination in the abandoned well of the carbon storage bank [15][16][17]. The possible geomechanical risks in the CCS process were outlined [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The Influence of CO2 Physical Properties on Casing and Its Prediction Method

Cai,

Li,

et al. 2024

Processes

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In order to reveal the physical properties of CO2 under actual formation conditions, this paper establishes a mathematical model of the temperature field and pressure field in the wellbore under CO2 injection conditions, optimizes the state equation of CO2 physical-property parameters, calculates the change trend of CO2 density, viscosity, and compression factor along the wellbore, and obtains the influence law of CO2 corrosion on the casing and interface. The viscosity showed a downward trend along the well depth; the compression factor showed an upward trend. The surfaces of the three casings were smooth and flat without obvious defects, the cement structure was dense, and there was no obvious pore structure. After corrosion, with the increase of Cr content, the change of interfacial corrosion decreases. The morphology of the Q125 and 3Cr interface is loose after corrosion, while there is no obvious change in the 13Cr interface. With the prolongation of corrosion time, low wellbore internal pressure easily causes casing yield, and high wellbore internal pressure easily causes cement-sheath compression failure. The circumferential stress of the casing increases with the corrosion time extension, and the radial stress of the casing and cement sheath decreases first and then increases with the corrosion time. The compressive strength of the cement sheath does not exceed the compressive strength.

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Section: Introductionmentioning

confidence: 99%

The Influence of CO2 Physical Properties on Casing and Its Prediction Method

Cai,

Li,

et al. 2024

Processes

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“…The failure types of CSI include shear failure (i.e., compressive failure), debonding failure, and tensile failure (i.e., radial crack) [5][6][7]. The Von Mises criterion [8][9][10][11][12][13], Tresca criterion [14,15], Mohr-Coulomb criterion [5,16,17], and Energies 2023, 16, 7089 2 of 17 Drucker-Prager criterion [18,19] are often used to judge the cement sheath's shear failure. The cement sheath's shear failure can produce plastic strain.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Integrity of Cement Sheath under the Coupling Effect of Formation Creep and Temperature during the Operation of Salt Rock Gas Storage

Yang,

Bu,

Jing

et al. 2023

Energies

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Maintaining the integrity of the cement sheath is essential for the sealing of underground gas storage. The formation creep, temperature changes, and operating pressure changes during the operation of underground gas storage can cause changes in the stress of the cement sheath, which probably induces the failure of the cement sheath’s integrity. A creep model taking the effects of stress and temperature into account is developed to study the cement sheath’s integrity in creep formation, and the feasibility of creep simulation via finite element method is verified. The finite element method is used to analyze the effects of formation creep, temperature, operating pressure, and the cement sheath’s elastic modulus on the cement sheath’s integrity. The result shows that the coupling effect of formation creep and temperature increases the cement sheath’s failure risk; both the formation creep and the decrease in cement sheath temperature increase the Von Mises stress on the cement sheath, increasing the risk of the cement sheath’s shear failure. The decrease in cement sheath temperature decreases the circumferential compressive stress on the cement sheath and raises the risk of the cement sheath’s tensile failure. Shear failure of the cement sheath occurs at high operating pressure upper limits. The operating pressure is less than 70 MPa, or the cement sheath’s elastic modulus is less than 3 GPa, which can prevent the failure of the cement sheath’s integrity during the operation of underground gas storage.

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