Casing failure mechanism during volume fracturing: A case study of shale gas well

Lin, Tingyu; Yu, Haibin; Lian, Zhanghua; Sun, Biao

doi:10.1177/1687814017717182

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…Cho et al (2017) investigated bending characteristics of double-walled pipe during offshore sub-sea pipeline reel-lay operations using the finite element method. Rock mechanical experiments and numerical simulation experiments were carried out by Lin et al (2017) to solve the problem of a large number of casing failures that occur during the volume fracturing operation of shale gas, making normal completion stimulations impossible.…”

Section: Conduction Of Evaluation and Stress-relaxation Testing Of Elmentioning

confidence: 99%

Finite Element Analysis Applied to a Metal-to-Metal Seal Design

Lucci

Lamas

Grandinetti

et al. 2020

BJPG

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This work presents the use of a finite element model software and suggests its use as a tool to develop metal-to-metal seals with the objective of reducing the number of designs and empirical tests, increasing possibility of success during validation tests, decreasing the number of repetitions of real tests needed, therefore, reducing execution costs. The present work configures a model of seal in a finite element analysis software and simulates different sizes of meshes to evaluate which configuration presented results and computational costs compatible with this work. Then, it develops different models in an interactive way, this is, it performs geometry changes with the intention of optimizing results. At the end of each model, it evaluates the results. This work develops and evaluates six models. At last, the authors selected the model which presented enough contact pressure to perform the sealing. This model presented a compatible stress in accordance with the failure criteria adopted, plastic strain in an acceptable range, and system behavior in accordance with that suggested by Sweeney, Brammer, and Chalmers (2004) in seal extremities.

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Section: Conduction Of Evaluation and Stress-relaxation Testing Of Elmentioning

confidence: 99%

Finite Element Analysis Applied to a Metal-to-Metal Seal Design

Lucci

Lamas

Grandinetti

et al. 2020

BJPG

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“…According to Lian et al and Lin et al, stress deficiency is zero stress, and tension stress areas could produce “hanging” in the casing, resulting in partial radial deflection and axial S-shape deformation. 10 , 11 Tian et al and Yan et al discovered that the temperature of the retention fluid in the cement voids inside casings decreased sharply during hydraulic fracturing. 12 , 13 This, combined with the pressure drop inside the cement sheath voids, induced casing deformation.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Casing Deformation during Hydraulic Fracturing in the Horizontal Wells of the Weirong Shale Field

et al. 2022

ACS Omega

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Casing deformation is frequent during hydraulic fracturing in the Weirong shale gas field, which impedes shale gas production. We investigated the effect of shale elastic modulus on casing deformation based on shale swelling in this work. According to field data, the silicon content in the Weirong shale gas field has a considerable impact on casing deformation during hydraulic fracturing. Furthermore, the results of the experiment show that the silicon content is positively related to the elastic modulus of shale. We conducted numerical simulations to analyze the casing deformation based on shale swelling. We observed that the shale elastic modulus was negatively correlated with the casing stress without shale swelling; however, the shale elastic modulus was positively correlated to casing stress with shale swelling. Furthermore, when the elastic modulus remained constant, casing stress was positively correlated with shale swelling. The numerical simulation results were validated using field data from the WY23-5 shale well. Moreover, factors such as injection pressure, formation pressure, and cement sheath elastic modulus can increase the impact of the shale elastic modulus on casing deformation with shale swelling. Casing deformation is greatly influenced by the distribution of the stimulated reservoir volume (SRV) area. Different SRV area behaviors result in different types of casing deformation. The symmetric distribution of the SRV area causes casing extrusion deformation, whereas the asymmetric distribution of the SRV area causes casing bending deformation. Moreover, casing stress is positively correlated with the length of the SRV area.

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“…The problem of casing failure has a critical effect on the working lifetime of oil and gas wells and restricts the efficiency mining of oil and gas and reservoir construction. There have been serious casing failure problems in conventional and unconventional oil and gas fields [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Study of Deformation Law of Casing Local Lateral Collapse Based on the Principle of Virtual Work

Zhao

Ranjith

et al. 2019

Energies

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In view of the water swelling of mudstone and the creep induction function of formations in the process of oilfield water injection, the casing incurs collapse deformation under local lateral load. In this study, according to the actual collapse deformation characteristics of the casing in the second section of the Qing formation of the Songliao Basin in China, the yield surfaces of the casing collapse deformation are considered as plane plastic areas (half rhombus) with symmetric parabola shaped boundaries, and a mechanical model for the local lateral collapse deformation of casing is presented based on the principle of virtual work. Four types of casing, 4½″J55, 5½″J55, 4½″N80 and 5½″N80, are selected as examples. The relation of the casing intensity, the absolute reduction of intensity and the relative reduction ratio of intensity change with casing wall thickness, yield stress, radial maximum deformation, and deformation length are calculated and analyzed. The results show that the casing intensity of the casing is reduced under local lateral load, which is lower than the design standard value of the American Petroleum Association specification (API SPEC) 5CT. The relative reduction ratio declines linearly with the wall thickness of the casing wall as the yield stress increases, and increases linearly with increasing maximum deformation. In addition, the local lateral bearing capacity of the casing reaches the minimum value when the plastic deformation length reaches the critical value or the deformation quantity is less than the critical value. The conclusions provide scientific guidance for preventing casing failure accidents caused by deformation.

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Casing failure mechanism during volume fracturing: A case study of shale gas well

Cited by 14 publications

References 10 publications

Finite Element Analysis Applied to a Metal-to-Metal Seal Design

Finite Element Analysis Applied to a Metal-to-Metal Seal Design

Mechanisms of Casing Deformation during Hydraulic Fracturing in the Horizontal Wells of the Weirong Shale Field

Study of Deformation Law of Casing Local Lateral Collapse Based on the Principle of Virtual Work

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