Modified discrete element method (MDEM) as a numerical tool for cement sheath integrity in wells

Gheibi, Sohrab; Agofack, Nicolaine; Sangesland, Sigbjørn

doi:10.1016/j.petrol.2020.107720

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…Sohrab et al 96 employed a modified discrete element method to consider cement sheath and rock formations as porous media, analyzing radial fractures, shear failures, and interface debonding during pressurization/depressurization operations. Results indicated that casing pressure reduction led to casing-cement sheath interface debonding, while pressure increase potentially induced progressive shear and tensile failures in the cement sheath.…”

Section: Numerical Simulation Of Casing-cement Sheath-formation Systemmentioning

confidence: 99%

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Wu,

Li,

Hou

et al. 2024

ACS Omega

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The cement sheath, serving as the primary element of well barriers, plays a crucial role in maintaining zonal isolation, protecting the casing from corrosion, and providing mechanical support. As the petroleum industry shifts from conventional to deep unconventional resources, the service environment for cement sheaths has become increasingly complex. High temperatures, high pressures, cyclic loading, and thermal stresses in downhole conditions have significantly increased the risk of cement sheath failure. A growing trend toward theoretical analysis of stress distribution, failure modes, and control mechanisms within the casing-cement sheath-formation system is evident. This paper comprehensively reviews theoretical research on cement sheath integrity from four key perspectives: (1) the concept of cement sheath integrity failure, (2) cement sheath constitutive models, (3) analytical models of the cement sheath-casing-formation system, and (4) numerical simulations of the cement sheath-casing-formation system. Through these discussions, this review provides profound insights into cement sheath integrity failure and offers valuable guidance for future research and practices.

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Section: Numerical Simulation Of Casing-cement Sheath-formation Systemmentioning

confidence: 99%

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Wu,

Li,

Hou

et al. 2024

ACS Omega

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“…Studies on cement-rock interface damage have focused on investigating the influence of factors such as compressive strength [5], Young's modulus [6], friction angle, and cohesion [7,8] on the instability and damage of cement sheaths. Some researchers have also noted the impact of filter cake on shear strength [9,10], leading to further research on the primary causes of cement-rock interface cracking under tension [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cement Sheath–Rock Damage Mechanism—A Case Study on Water Injection Wells

Zhao,

Li,

Luo

2023

Applied Sciences

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In the field of water injection wells within oilfields, comprehending the intricate mechanics of water channeling and the resulting rock damage on the external cemented surface holds paramount significance for the efficient management of reservoirs. This paper presents a comprehensive study aimed at illuminating the complex nature of rock damage on the external cemented surface of casings and deciphering the underlying mechanisms that underpin water channeling occurrences. To this end, a robust constitutive model is established and refined to capture the multifaceted interactions inherent in rock damage on the cemented surface. This model introduces a modified bonding force approach to enhance shear stress precision and thoughtfully accounts for the profound effects of elastic–plastic behavior, cracking damage, and elastic-cracking coupling damage on damage progression. Subsequently, the refined model is employed to investigate rock damage on the external cemented surface of water injection wells, encompassing variations in confining pressure, rock width on the cemented surface, and the ratio of Young’s modulus between the cement sheath and the rock. The research findings emphasize the interplay between cracking and elastic damage as the catalyst for rock damage on the cemented surface. Impressively, the accuracy of the refined constitutive model for the cemented surface has advanced by over 5% compared to prior studies. The manipulation of confining pressure and the Young’s modulus ratio enhances peak fracture water pressure, signifying substantive strides in comprehending damage propagation mechanics. Furthermore, the study discerns the negligible influence of rock width on the cemented surface regarding damage patterns. These findings have important implications for the effective management of water injection wells, providing insights for the restoration of water channeling wells and proactive measures against water channeling phenomena. They also contribute to the refinement of well cementing practices and the proficient management of water channeling and water flooding in oilfields. The research findings have profound implications for the domain of water injection wells, offering novel insights into the restoration of water channeling wells and the implementation of preemptive measures against water channeling phenomena. These findings hold the potential to guide the refinement of well cementing practices and the adept management of water channeling and water flooding wells within the studied oilfield.

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“…The experience, laboratory studies, and actual field cases have proved that, even though primary cementation has been successful and initially cement performs its sealing functions effectively, changes may occur in the pressure and temperature conditions due to the well's operative life which induce stresses through the casing and the formation, capable of deteriorating the integrity of cement and cause its mechanical failure [3]. One of these types of failure is by debonding in its interfaces, which causes undesirable phenomena such as sustained pressure behind the casing, uncontrolled interzone flow, and leak of fluids towards the surface that lead to severe technical, economic, and environmental problems [4,5]. Therefore, modeling the mechanical failure on the interfaces is a significant step to avoid the aforementioned problems and ensure the safe operation of the well.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling to evaluate tensile mechanical and shear failure of cement in the casing-cement interface

Mayorga-Ribero

Gambús-Ordaz

Palencia-Muñoz

et al. 2022

DYNA

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This paper presents a numerical model of an integrated 3D casing-cement-formation system, to evaluate the mechanical tensile and shear failure of the cement at the casing-cement interface as the pressure and temperature conditions of the formation and borehole vary during production. The model which includes the formation pressure, unlike others proposed, was developed by stages under finite element discretization and compared to analytical models. Results show that increasing the formation temperature increases the probability of tensile and shear failure in the cement, while increasing the wellbore temperature decreases these probabilities. On the other hand, the decrease in the well pressure reduces the probability of shear failure and increases the tensile failure. In the case of formation pressure, the opposite occurs.

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Modified discrete element method (MDEM) as a numerical tool for cement sheath integrity in wells

Cited by 12 publications

References 18 publications

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Analysis of Cement Sheath–Rock Damage Mechanism—A Case Study on Water Injection Wells

Numerical modeling to evaluate tensile mechanical and shear failure of cement in the casing-cement interface

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