Finite Element Analysis of Crack Propagation and Casing Failure Process under Thermal Mechanical Coupling

Zhu, Quanyin; Hu, Shou Kang; Chen, Yan Hua

doi:10.4028/www.scientific.net/amr.197-198.1613

Cited by 4 publications

(4 citation statements)

References 10 publications

(8 reference statements)

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“…From this, it can be seen that China has conducted extensive research on the structural aspects of wellbore integrity in thermal recovery wells [14][15][16]. However, there has been relatively limited research on the impact of heating methods for shale oil extraction on the integrity of wellbores, casing, cement, and the geological formations as a whole [17][18][19][20]. This research gap is particularly significant due to the inherent limitations of shale oil reservoirs, which necessitate the timely supplementation of subsurface energy during the development process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Wellbore Integrity and Casing Damage in High-Temperature Injection and Production of Shale Oil

Yu,

Cen,

Kan

et al. 2023

Processes

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Shale oil represents a relatively new form of unconventional oil and gas resource, and the extensive exploration and development of shale oil resources carry significant implications for China’s oil and gas supply and demand dynamics. At present, within the realm of low-maturity shale oil extraction technologies, the reservoir must be subjected to elevated temperatures ranging between 400 to 60 °C. Prolonged exposure of wellbores to such high temperatures can result in a substantial decrease in cement strength, the formation of microcracks due to cement cracking, and damage stemming from thermal stresses on the casing. Casing damage stands out as a prominent factor contributing to wellbore integrity failures and well shutdowns within the context of shale oil development. Given the limited natural energy reservoirs of shale oil formations, it becomes necessary to supplement the reservoir’s energy during the development process. Furthermore, shale oil exhibits high viscosity and poor flowability, and conventional water injection methods yield limited efficacy. This situation can induce significant shifts in the stress field and rock mechanical parameters, potentially activating specific formations and complicating the load dynamics on the casing. Consequently, the risk of failure increases. In light of these considerations, this study uses numerical simulations to study the integrity of high-temperature injection and production wellbores in shale oil and aims to encompass a comprehensive evaluation and analysis of the principal factors that influence casing damage, the fluctuations in thermal stress, and the yield strength of various steel grades of casings exposed to alternating stress conditions. Subsequently, this paper developed a model for simulating the temperature and pressure within shale oil and steam injection wellbores to support engineering design analysis. The research results indicate that the application of pre-stress results in a significant increase in stress at the casing pipe head while causing a noticeable decrease in stress within the pipe wall. When N80 casing is used, the entire casing experiences thermal stresses surpassing the casing’s yield limit. Stress concentration may arise at both ends of the external seal, potentially leading to casing contraction, shear failure, and, under non-uniform stress conditions, casing bending deformation. The temperature of steam injection significantly influences the temperature field of the casing wall, with stress values experiencing a marked reduction when the steam injection temperature decreases from 350 °C to 200 °C, underscoring the substantial impact of temperature on casing thermal stress. As the steam injection process advances along with injection-production cycles, shear stresses at the interface can exceed the bond strength, resulting in relative slippage between the cement and the casing. The bonding force between the wellbore and the cement primarily depends on the interface’s friction, particularly in the context of friction during wellhead lifting. This study endeavors to determine rational injection and production parameters under varying conditions, optimize completion methods, reduce casing damage, and extend the casing’s operational life; it aims to offer critical technical support for the safe and efficient development of shale oil resources.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Wellbore Integrity and Casing Damage in High-Temperature Injection and Production of Shale Oil

Yu,

Cen,

Kan

et al. 2023

Processes

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“…The crack of buried liquid-conveying pipeline is one of the primary engineering problems, which is controlled by site deformation [3][4][5]. Site deformation is affected by soil properties that determine the pipe-soil fiction coefficient, and friction coefficient can be treated as a variable in this case.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Buried Pipeline Crack with Pipe-Soil Friction

Chen¹,

Wang²,

Ma³

et al. 2017

dtmse

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In order to analyze the effect of pipe-soil friction on crack propagation of buried liquidconveying pipeline, computing methods of friction coefficient between site soil and pipe and iterative solution method of two-way couplings on internal interface of pipe for liquid-structure interaction were introduced. A three dimensional finite element model with parasolid and native method was established, in which friction and fluid-structure boundary for interaction iterative solution was considered. Then, crack of buried liquid-conveying pipeline and effect of pipe-soil friction were analyzed. Results show the optimal friction coefficient, the damage position, and its stress. Also, some advice is proposed for engineering protection.

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“…Hence, it is of high significance to use finite element computing and modelling of fluidsolid interaction in porous material to avoid such disasters. [1][2][3][4] The deformation of rock is not only affected by structural stress, but also related to the effect of the fluid flow. Furthermore, the rock properties, such as material, porosity and permeability can also make a great impact on rock deformation.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of deformation mechanism for porous materials under fluid–solid interaction

Zhu

Yin

2014

Materials Research Innovations

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Deformation of underground rocks, also named rock creep, is treated as porous materials which usually results in many engineering problems, especially in petroleum engineering. However, it can be controlled by fluid-solid interaction in porous materials, and the deformation mechanism of underground rocks with fluid-solid interaction was analysed by finite element computing method. Specifically, an Iterative computing method and a computational procedure of two-way fluid-solid coupling are used to simulate deformation process until the fluid and solid solution variables are fully coupled. A typical application example was taken in Jinzhou oil production plant of Liaohe Oil Field Company, and a finite element model is built by combined application of parasolid and native modelling methods. According to the calculation results, deformation mechanism of underground rocks is proposed, and some advice is also presented.

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Finite Element Analysis of Crack Propagation and Casing Failure Process under Thermal Mechanical Coupling

Cited by 4 publications

References 10 publications

Numerical Simulation Analysis of Wellbore Integrity and Casing Damage in High-Temperature Injection and Production of Shale Oil

Numerical Simulation Analysis of Wellbore Integrity and Casing Damage in High-Temperature Injection and Production of Shale Oil

Finite Element Simulation of Buried Pipeline Crack with Pipe-Soil Friction

Finite element analysis of deformation mechanism for porous materials under fluid–solid interaction

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