Effects of alternating stress on casing damage mechanism

AN Fengchen; ZHANG Feiyang; YI Hao; ZHANG Sui'an

doi:10.3969/j.issn.1001-1986.2021.01.015

Volume 49 Issue 1

Feb. 2021

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COAL GEOLOGY & EXPLORATION > 2021 > 49(1): 143-150. > DOI: 10.3969/j.issn.1001-1986.2021.01.015

AN Fengchen, ZHANG Feiyang, YI Hao, ZHANG Sui'an. Effects of alternating stress on casing damage mechanism[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(1): 143-150. DOI: 10.3969/j.issn.1001-1986.2021.01.015

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Effects of alternating stress on casing damage mechanism

1. College of Safety and Ocean Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
2. College of Arts and Sciences, Ohio State University, Columbus, Ohio OH 43210, United States of America;
3. College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China

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Received Date: November 19, 2020
Revised Date: December 19, 2020
Published Date: February 24, 2021

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Abstract

Abstract

Horizontal well staged fracturing technology of horizontal well has been widely used in the exploitation of low-permeability oil and gas reservoirs and coalbed methane, and has achieved good economic results. However, the vertical section of the casing is found to be damaged with serious deformation in the process of multi-stage hydraulic fracturing, which will prevent bridge plugs from being installed at the preferred design depths, thereby resulting in abandonment of all remaining fracturing stages. In this study, a user element is developed to simulate the mechanical behavior at the casing-cement sheath interface under cyclic loads. The developed element is then implemented into an axisymmetric finite element(FE) model of the casing-cement sheath-stratum system through ABAQUS to simulate the mechanical behavior of the casing during horizontal well staged fracturing. The FE results reveal that casing damage with large deformation is induced by the alternation of the resultant stress between injection pressure and geo-stress. The fatigue life of the casing is then estimated through FE-safe based on the obtained results through ABAQUS, thereby finding out that the most vulnerable part of the casing is located at interlaced area between hard and soft strata with the lowest fatigue life. Based on the aforementioned results, increasing the pressure inside the casing at the non-fracturing stage is highly recommended to mitigate casing damage in the interlaced area between hard and soft strata during horizontal well staged fracturing.
- casing damage,
- CBM,
- horizontal well staged fracturing,
- finite element model,
- user element

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