Research on the law of mechanical damage-induced deformation of cement sheaths of a gas storage well

Li, Zaoyuan; Sun, Jianbo; Luo, Pingya; Lin, Luan; Deng, Zhizhong; Guo, Xiaolu

doi:10.1016/j.jngse.2017.03.026

Cited by 38 publications

(14 citation statements)

References 19 publications

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“…(a) The test device replicates the shape of the wellbore cement sheath, and the forces exerted by the device are close to those that occur in the wellbore 42 . (b) Prefabricated samples are not required for the pressurized curing chamber because the pieces can be cured and evaluated directly in the test device 1,37 . This approach avoids damaging the cement sheath during cooling and exposure to reduced pressure before the test.…”

Section: Methodsmentioning

confidence: 92%

“…Therefore, natural gas surpluses are typically injected into closed underground gas storage systems during the off‐season. Gas storage wells constructed from depleted oil or gas reservoirs are reliable and cost‐effective 1 . In general, gas injection and gas storage production are performed after drilling and cementing 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Most studies to date have conducted theoretical or experimental studies. Few studies have combined theory and experiment to construct a simulated wellbore that incorporates size, material, and loading conditions using a stress equivalence method to replicate the effect of the wellbore stress on the cement sheath 1,37 . Li et al 1,37 first converted the casing inner pressure of a wellbore to a von Mises stress to construct a simulated wellbore that replicated the stress state of the actual wellbore and evaluate the mechanical properties of a cement sheath.…”

Section: Introductionmentioning

confidence: 99%

“…Few studies have combined theory and experiment to construct a simulated wellbore that incorporates size, material, and loading conditions using a stress equivalence method to replicate the effect of the wellbore stress on the cement sheath 1,37 . Li et al 1,37 first converted the casing inner pressure of a wellbore to a von Mises stress to construct a simulated wellbore that replicated the stress state of the actual wellbore and evaluate the mechanical properties of a cement sheath. However, this study could not quantify the deformation law of the casing‐cement sheath formation because the material around the cement sheath was a rubber cylinder, which allowed more deformation of the cement sheath and decreased the reliability of the integrity results.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and damage of cement sheath in gas storage wells under cyclic loading

Li¹,

Tang³

et al. 2021

Energy Science & Engineering

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The mechanical damage and failure of cement sheaths in gas storage wells under cyclic loading have been studied extensively. However, because the test device cannot restore the wellbore condition, most studies have been theoretical or regular experimental. If the load‐bearing mode and stress environment in a test device differ from those in a wellbore, then the damage and failure modes will deviate from what occurs in the actual wellbore. Therefore, it is necessary to explore a method that restores the wellbore condition and design a wellbore simulation device that reveals the deformation and damage of the cement sheath. In this study, the development laws of microannulus and microcracks in the cement sheath were studied by triaxial cyclic loading, low‐field nuclear magnetic resonance imaging, and scanning electron microscopy. A device to evaluate cement sheath integrity was then developed. A stress equivalence method was proposed, based on the principle that the stresses at the first and second interfaces of the device are equal to those of the wellbore cement sheath. This method was used to design material, size, and experimental conditions to simulate the load‐deformation law of a cement sheath in a gas storage well. The damage failure mechanism was investigated using the simulation results and computed tomography. Micropores and microcracks in the cement sheath increased continuously under cyclic loading. Damage accumulated, causing strength failure as the period of the cyclic loading increased. Plastic deformation of the cement sheath occurred under cyclic loading, but interfacial peeling did not. The reason is that the cement sheath is under compressive stress during loading and unloading, and the interface between the cement sheath and the outer wall is not damaged. This study provides a new method for studying the mechanical failure of a cement sheath under complex wellbore conditions.

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Section: Methodsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation and damage of cement sheath in gas storage wells under cyclic loading

Li¹,

Tang³

et al. 2021

Energy Science & Engineering

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“…In oil and gas well cementing, the cement slurry is filled outside the casing pipes (Li et al 2017). Thus, the sheath modification is required to maintain the well integrity behind the casing (Zeng et al 2019) and provide longterm zonal isolation to ensure the safety and prevention of environmental problems (Jafariesfad et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Coupled effects of hydrophilic nano silica oxide and anatase nano titanium oxide on strengths of oilwell cement

Mabeyo

2021

Tanz. J. Sci.

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The life of oil wells depends on the stability of cement sheath and bond strength with the formation and casing. Extreme subsurface conditions cause substantial stresses on the cement sheath resulting in a serious impact on well integrity. The recommended API cement for oilwell fails to provide the required durability of the cemented well due to such conditions. Supplementary cementitious materials such as nanoparticles are added to improve the cement for long-lasting zonal isolation. In this study, the compressive and shear bond strengths of oilwell cement containing nano-SiO2 and nano-TiO2 were studied at 80 °C for 3, 7, 14, and 28 days of hydration. The XRD, TG, and DSC were used for the analysis of cement hydration products. The results revealed that both nano-SiO2 and nano-TiO2 increased strength evolution. A ternary system made with 2% nano-SiO2 and 2% nano-TiO2 improved compressive strength by 22.6 and 48.4%, while the shear bond strength increased by 110.6 and 55% at age of 3 days and 28 days, respectively, compared to their corresponding binary systems. Therefore, these results remark the potential of replacing an appropriate proportion of oilwell cement with coupled nano-SiO2 and nano-TiO2 to ensure cement sheath structure durability in the annular and long-lasting zonal isolation. Keywords: Nano-silica, nano-titanium, compressive strength, shear bond strength, oilwell cement

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Preparation of a high‐temperature‐resistant lightening agent and its application in a cement slurry system

Zhang

Cai

2018

J of Applied Polymer Sci

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With an organic–inorganic polymer lightening material (EL) based on epoxy resin and an aromatic amine curing agent, through addition reaction, we synthesized an epoxy‐cured resin coupled with an inorganic activation filler, microsilicon. First, epoxy resin bisphenol A 2‐glycidyl ether (E‐51) and the curing agent, m‐phenylenediamine, were selected as the materials for the epoxy‐curing system. The thermal stability of the epoxy‐cured compound (EM) was studied by differential scanning calorimetry and thermogravimetric analysis. The glass‐transition temperature (T g) of EM reached 131 °C, and the results show that T g and the thermal stability was raised when EM was kept at 150 °C for 12 h. Second, the inorganic active filler was modified with a titanate coupling agent and characterized by contact angle measurement and Fourier transform infrared spectroscopy, and the results show that the titanate coupling agent was successfully applied to the modification of the inorganic active filler. Finally, the performance of EL in a cement slurry system was also studied. The macroscopic data showed that the compressive strength of the cement stone increased from 8.6 MPa for the EM cement stone system to 13.2 MPa for the EL cement stone system. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 136, 47292.

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Research on the law of mechanical damage-induced deformation of cement sheaths of a gas storage well

Cited by 38 publications

References 19 publications

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Deformation and damage of cement sheath in gas storage wells under cyclic loading

Coupled effects of hydrophilic nano silica oxide and anatase nano titanium oxide on strengths of oilwell cement

Preparation of a high‐temperature‐resistant lightening agent and its application in a cement slurry system

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