Numerical simulation of the thermomechanical behavior of cement sheath in wells subjected to steam injection

Souza, Wendell Rossine Medeiros de; Bouaanani, Najib; Martinelli, Antônio Eduardo; Bezerra, Ulisses Targino

doi:10.1016/j.petrol.2018.04.023

Cited by 29 publications

(5 citation statements)

References 51 publications

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“…It is increasingly important to develop safer, environmentally friendly, and cost-effective technologies to satisfy the growing oil demand while conventional resources are decreasing [1]. As the main barrier to ensure zonal isolation and maintain the integrity of the wellbore, cement sheath must have an acceptable mechanical strength to withstand severe loading conditions resulting from the application of these new technologies.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, more accurate mechanical strength models and better assessment of cement integrity are necessary to reduce the risk of failure. Numerical simulation is commonly applied to investigate the mechanical integrity of cement [2], also by using some software such as ABAQUS [3,4], ANSYS [5], and ADINA [1]. In all types of applications, an accurate well cement stress–strain model is required.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Stress-Strain Model for Confined Well Cement

Ahmed

et al. 2019

Materials

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The cement sheath is the key for providing the zonal isolation and integrity of the wellbore. Oil well cement works under confining pressure, so it exhibits strong nonlinear and ductile behavior which is very different from that without confining pressure. Therefore, for the accuracy of the simulation and the reliability of well construction design, a reliable compression stress–strain model is essential for confined well cement. In this paper, a new axial stress–strain model for confined well cement is developed based on uniaxial and triaxial test data, examinations of failure mechanisms, and the results of numerical analysis. A parametric study was conducted to evaluate and calibrate the model. The model is simple and suitable for direct use in simulation studies and well design. Results from this study show the nonlinear compressive behavior of confined well cement can be predicted using the traditional uniaxial compressive strength test measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Stress-Strain Model for Confined Well Cement

Ahmed

et al. 2019

Materials

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“…The cement sheath can effectively prevent corrosion, deformation, and failure of the metal casing [9][10][11][12] . Failure of the cement sheath can cause a deformation of the metal casing and fracturing well collapse, resulting in hydraulic fracturing process failure and huge economic losses [13][14][15][16] . Studies have found that the cement type, stratum conditions, fracturing methods, and temperature environment significantly affect the safety of cement sheaths [17][18][19][20][21][22][23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

Effects of the porous structure of cement sheaths on the deformation failure mechanism of wellbore cement sheaths

Yao

Sun

2023

Preprint

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Two types of cement sheaths with different porosities were prepared by using cement materials and liquid silicon suspension. The distribution characteristics of the pore radius and space location of two types of cement sheaths were analyzed using CT scanning experiments and statistical principles to obtain their probability density distribution functions. Based on the distribution functions, the “single-layer” and “double-layer” porous models of two types of cement sheaths were constructed using a self-developed program incorporated with the FLAC 3D program. A series of numerical simulations were conducted to study the deformation and failure laws of wellbore cement sheaths under in situ stress and hydraulic pressure. The effects of the porosity and double-layer structure on the breakdown pressure, plastic failure zone, radial deformation, and stress distribution of the cement sheaths were analyzed. As a result, the effect mechanisms of the porosity and double-layer structure on the failure mode, failure path, and interaction between the cement sheath and metal casing were revealed. The failure modes and paths of single- and double-layer cement sheaths were obtained. This research provides a basis for understanding the characteristics of stress distribution, deformation, and failure mode of porous cement sheaths under hydraulic pressure.

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“…The influencing factors and rules of cement seal integrity are complex. Existing studies show that different seal failures of cement sheaths, such as compression failure, tensile failure, and cementation failure (Andrade et al, 2016;De Andrade and Sangesland, 2016), may occur under such conditions as temperature changes in the wellbore, casing pressure tests and density reductions in the casing (Liu et al, 2014;Rossine Medeiros de Souza et al, 2018). The elastic modulus of the cement sheath, initial stress, bonding strength and other factors have a great influence on the sealing ability of the cement sheath (Ladva et al, 2004;Wang and Taleghani, 2014;Arjomand et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Casing Eccentricity on the Cement Sheath Sealing Integrity in the Tie-Back Interval Under the Complex Temperature and Pressure Conditions of Deep-Water Oil and Gas Wells

Zhong¹,

Wu²,

Xie³

et al. 2022

Front. Energy Res.

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The integrity of cement sheath seals in casing connection sections is an important part of preventing air channelization. It is of great significance to evaluate the failure mechanism of cement sheath seals in casing connection sections under complex temperatures, pressures, and casing eccentricities. Based on the self-developed high-temperature and high-pressure full-size casing connection period of the cement sheath seal integrity evaluation device and the casing loading/unloading casing eccentricity influence on the cement sheath seal failure under the experimental conditions, it is concluded that the casing pressure changes, annulus preset pressure, and casing eccentricity influence the law of cement sheath seal integrity. The results show that the following: ① Casing eccentricity has an important influence on the failure of the cement sheath seal when the casing is loaded, and to ensure the integrity of the cement sheath seal the casing should be greater than 75%; ② in the case that the annular pressure is not set, casing eccentricity has little influence on the integrity of the cement annular seal during casing unloading, and sealing failure occurs when pressure unloading is 15–20 MPa; ③ when there is a preset pressure in the annulus, casing eccentricity has a great influence on seal failure during unloading. The greater the preset pressure in the annulus is, the better the seal integrity of the cement annulus. The research results provide an important basis for ensuring the integrity of cement sheath seals in casing connection sections.

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Numerical simulation of the thermomechanical behavior of cement sheath in wells subjected to steam injection

Cited by 29 publications

References 51 publications

Nonlinear Stress-Strain Model for Confined Well Cement

Nonlinear Stress-Strain Model for Confined Well Cement

Effects of the porous structure of cement sheaths on the deformation failure mechanism of wellbore cement sheaths

Influence of the Casing Eccentricity on the Cement Sheath Sealing Integrity in the Tie-Back Interval Under the Complex Temperature and Pressure Conditions of Deep-Water Oil and Gas Wells

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