Wellbore Characteristics that Control Debonding Initiation and Microannuli Width in Finite Element Simulations

Wise, Jarrett; Cedola, A. E.; Nygaard, Runar; Hareland, Geir; Arild, Øystein; Lohne, Hans Petter; Ford, Eric

doi:10.1016/j.petrol.2020.107157

Cited by 27 publications

(8 citation statements)

References 21 publications

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“…Moreover, the cement sheath is easier to leak under hydraulic fracture 50 or low displacement efficiency 51 . Another type of cement sheath leakage is microannuli in the casing and cement interface 52,53 . The microannuli is usually caused by high stress or cyclic load and temperature.…”

Section: Proposed Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Zhang,

Pan,

Cao

et al. 2023

Energy Science & Engineering

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Leakage is one of the most serious challenges for the safe production of high‐pressure gas wells for its high risks, including abnormal annular pressure, natural gas accumulation, and environment pollution, but available methods can hardly accurately measure the leakage type and depth, which are the key parameters for the rigless leakage repair and risk assessment. Therefore, this paper proposes a method to measure the leakage based on the characteristics, which combines qualitative and quantitative measurement together. Qualitative measurement considers the annular pressure, tubing pressure, liquid level, cement quality, and workover history. Quantitative measurement is determined by noise logging, electromagnetic logging, pressure logging, and temperature logging. The logging should be optimized according to the qualitative measurement. The method was successfully applied in high‐pressure gas well belonging to Tarim Oilfield. Two potential leakage types are provided based on the annular pressure, liquid level, cement quality, and workover history, including tubing leakage and linger hanger leakage. Based on the potential leakage types, the pressure difference, logging devices string, stopping length, and time are optimized to make the engineering logging reliable. Through measurement, two leakage points are found in tubing string. One is tubing body crack at the depth of 2724 m and the other is tubing thread leakage at the depth of 5211.7 m, which well matches the production data.

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Section: Proposed Methodsmentioning

confidence: 99%

“…51 Another type of cement sheath leakage is microannuli in the casing and cement interface. 52,53 The microannuli is usually caused by high stress or cyclic load and temperature. Fluid may also leak into cement sheath from the formation.…”

Section: Packer Leakage/liner Hanger Leakagementioning

confidence: 99%

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Zhang,

Pan,

Cao

et al. 2023

Energy Science & Engineering

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“…[14] showed a chemo-poroelastoplastic model capable of predicting the initial stresses on cement, as well as the possible origin of micro annuli during cement dehydration under different temperature and pressure conditions. [15] used a 3D FE model to develop sensitivity plots for design and operation parameters, such as cement properties, wellbore pressure and annulus pressure; and [16] conducted finite elements analyses to evaluate the critical variables in the origin of failure caused by debonding on the interfaces and formation of micro annuli.…”

Section: Reference Frameworkmentioning

confidence: 99%

Numerical modeling to evaluate tensile mechanical and shear failure of cement in the casing-cement interface

Mayorga-Ribero

Gambús-Ordaz

Palencia-Muñoz

et al. 2022

DYNA

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This paper presents a numerical model of an integrated 3D casing-cement-formation system, to evaluate the mechanical tensile and shear failure of the cement at the casing-cement interface as the pressure and temperature conditions of the formation and borehole vary during production. The model which includes the formation pressure, unlike others proposed, was developed by stages under finite element discretization and compared to analytical models. Results show that increasing the formation temperature increases the probability of tensile and shear failure in the cement, while increasing the wellbore temperature decreases these probabilities. On the other hand, the decrease in the well pressure reduces the probability of shear failure and increases the tensile failure. In the case of formation pressure, the opposite occurs.

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“…In other words, are microannuli homogeneous and uniform around the entire circumference of the cement, or not? Model simulations have shown that the size of microannuli can be dependent on wellbore characteristics such as formation properties, casing size and cement stiffness [27,67], however, the resulting shapes can be challenging to determine from such simulations. Stormont et al [24] and Garcia Fernandez et al [25] found experimentally that the microannulus aperture can vary considerably around the circumference when they studied gas flow through different microannuli, and concluded that microannuli have complex geometries.…”

Section: Visualization Of Microannuli and Cement Debondingmentioning

confidence: 99%

Digital Cement Integrity: A Methodology for 3D Visualization of Cracks and Microannuli in Well Cement

Vrålstad

Skorpa

2020

Sustainability

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Leakages of greenhouse gases, such as methane and carbon dioxide from wells, may have considerable environmental consequences. Although much emphasis is currently put on understanding well barrier failures, and thus, preventing well leakages, especially for an important barrier material as cement, there are still several knowledge gaps and unknowns. However, a step-change in well integrity understanding may be obtained by applying advanced characterization techniques and scientific approaches to studying well barrier materials and their failure mechanisms. This paper describes the development of an experimental methodology that uses X-ray computed tomography to obtain 3D visualizations of cracks and microannuli in annular cement sheaths. Several results are included that demonstrate the value of using such digital methods to study well cement, and it is shown that such experimental studies provide an improved understanding of cement sheath integrity. For example, it is seen that radial cracks do not form in symmetrical patterns and that microannuli do not have uniform geometries. Such experimental findings can potentially be used as benchmark to validate and improve cement integrity simulation tools.

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Wellbore Characteristics that Control Debonding Initiation and Microannuli Width in Finite Element Simulations

Cited by 27 publications

References 21 publications

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Numerical modeling to evaluate tensile mechanical and shear failure of cement in the casing-cement interface

Digital Cement Integrity: A Methodology for 3D Visualization of Cracks and Microannuli in Well Cement

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