Strength analysis of perforated casing in ultra-deep horizontal shale wells during sublevel acidizing and hydraulic fracturing process

Lian, Zhanghua; Yuheng, Tuo; Zhang, Qiang; Yu, Haibin; Mou, Yisheng; Wu, Yang

doi:10.1177/16878132221114592

Cited by 2 publications

(1 citation statement)

References 21 publications

(30 reference statements)

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“…Because the perforation hole changes the casing structure, when the casing is subjected to external force, the stress concentration around the perforation hole will greatly reduce the casing strength. The number of casing to damage wells caused by perforation in some oilfields accounts for 60%~70% of the total number of casing to damage wells [1][2].…”

Section: Introductionmentioning

confidence: 99%

Strength analysis of perforated casing under non-uniform in-situ stress in ultra-deep wells

liu,

Li,

Luo

et al. 2023

Second International Conference on Applied Statistics, Computational Mathematics, and Software Engineering (ASCMSE 2023)

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Perforate casing to damage often to occur in the process of oil test and production of ultra-deep oil and gas wells under the combined action of non-uniform in-situ stress and internal pressure. The traditional finite element method requires a lot of time and energy to consider the model size, calculation scale, calculation accuracy and other issues when calculating the strength of perforated casing. In this paper, a method of calculating casing strength based on step-by-step finite element method is proposed. Firstly , the contact pressure in casing outer wall of non-uniform in-situ stress is calculated according to the two-dimensional model, and then it is loaded into the three-dimensional perforation casing finite element model by programming to simplify the evaluation of casing bearing capacity. The research shows that perforation changes the distribution of casing stress. After perforation, the maximum stress of casing occur to the perforation hole, and the local stress at the perforation hole increases. The maximum equivalent stress of perforating casing occurs to the direction of minimum horizontal stress. With the increase in perforation holes, casing is more prone to damage. This study provides a calculation method and theoretical basis for the design and application of ultra-deep well casing.

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Section: Introductionmentioning

confidence: 99%

Strength analysis of perforated casing under non-uniform in-situ stress in ultra-deep wells

liu,

Li,

Luo

et al. 2023

Second International Conference on Applied Statistics, Computational Mathematics, and Software Engineering (ASCMSE 2023)

View full text Add to dashboard Cite

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Factors affecting casing equivalent stress in multi-cluster fracturing of horizontal shale gas wells: finite element study on Weirong Block, southern Sichuan Basin, China

Yang

Sun

2023

J Petrol Explor Prod Technol

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Multi-cluster fracturing technology was often used in horizontal well reservoir reconstruction to achieve production increase, which also affected casing equivalent stress distribution. This paper focuses on multi-cluster fracturing and establishes a fracturing model in line with the reality. The three-dimensional finite element model of multi-cluster fracture-formation-cement sheath-casing was proposed, the influence of cluster spacing and fracturing cluster number on casing equivalent stress was studied. On this basis, a single segment 8-cluster three-dimensional finite element model was developed. The influence of rock elastic modulus, casing inner wall pressure, geostress change and elastic modulus of cement sheath on casing equivalent stress was simulated from two aspects of uniform and non-uniform extrusion of wellbore. Actual data was used and analyzed for the fracturing section of a well in Weirong Block, southern Sichuan Basin, China. The results showed that the casing equivalent stress decreased with the increase of fracture dip angle. The casing equivalent stress increased with the increase of cluster spacing; however, it decreased with the increase of rock elastic modulus. The casing equivalent stress increased with the increase of casing wall pressure. Also, the cracks extrude the casing evenly did not affect the change on casing equivalent stress. It was also found that, when casing was uniformly squeezed by multiple fractures, the difference of ground stress had little effect on casing equivalent stress, while non-uniform extrusion had greater effect on casing equivalent stress. Further, when there was no wellhead pumping pressure, the casing equivalent stress increased with the increase of the elastic modulus of the cement sheath, and decreased on the contrary. The elastic modulus of rock was lower than that of cement sheath, and the casing equivalent stress increased with the increase of the elastic modulus of cement sheath, and decreased on the contrary. The research results had certain guiding significance for the prevention and control of casing damage in fracturing section.

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Strength analysis of perforated casing in ultra-deep horizontal shale wells during sublevel acidizing and hydraulic fracturing process

Cited by 2 publications

References 21 publications

Strength analysis of perforated casing under non-uniform in-situ stress in ultra-deep wells

Strength analysis of perforated casing under non-uniform in-situ stress in ultra-deep wells

Factors affecting casing equivalent stress in multi-cluster fracturing of horizontal shale gas wells: finite element study on Weirong Block, southern Sichuan Basin, China

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