Mechanical response and damage mechanism of cement sheath during perforation in oil and gas well

Yan, Yan; Guan, Zhichuan; Yan, Weijun; Wang, Hongtu

doi:10.1016/j.petrol.2020.106924

Cited by 33 publications

(12 citation statements)

References 23 publications

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“…Once again, the parameters set out in the engineering data section in ANSYS are [ 22 ]: T t max —maximum equivalent tangential contact debonding (the value of this parameter will be extracted from the experimental work). δ t *—tangential slip at the completion of debonding (this value will also be extracted from the experimental data).…”

Section: The Finite Element Simulationmentioning

confidence: 99%

“… δ t *—tangential slip at the completion of debonding (this value will also be extracted from the experimental data). Artificial damping coefficient—according to [ 22 ], this parameter is used for convergence purposes, and, normally, it is related to the incremental time step used for the simulation. …”

Section: The Finite Element Simulationmentioning

confidence: 99%

“…Yan et al [ 21 ] developed a numerical and experimental methodology for modelling the debonding of the cementing interface during perforation jobs. Although Yan et al [ 21 , 22 ] used ANSYS as a numerical simulation environment, they came to the conclusion that the CZM method may not fully describe the dynamical simulation they proposed; hence, they used simple casing–cement bonding models.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigations of Cement Bonding Properties at Elevated Temperatures—The Effect of Sample Cooling

Lambrescu

Teodoriu

2022

Materials

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Well integrity is currently defined through the concept of well barriers, in which one or more barriers are used to prevent unwanted fluid flow. Many papers have highlighted that the casing–cement interfacial bonding is critical for well integrity, but many discrepancies between laboratory experiments and field data have been noticed. The use of finite element analysis is now established as an alternative to complex in situ tests, but these simulations are sensitive to the input parameters, which results in many discrepancies across published works. Currently, the cohesive zone material (CZM) method is considered to offer good results if the correct parameters are selected or experimentally determined. The novelty of this paper lies in the development of a better workflow that enables the simulation of three processes that are acting on the laboratory-scale casing–cement system: temperature changes, debonding, and post-debonding behavior. The aim of this paper is to fully understand the debonding process within laboratory-scale samples, and thus to eventually enable upscaling in the near future. The paper presents a new workflow generated using FEM that allows us to determine the contact stresses at the casing–cement interface during temperature changes at the moment of debonding and post-debonding. The results presented within this paper show that temperature samples tested according to the push-down setup will provide similar interfacial bonding shear strength values; however, post-debonding, there is a remaining frictional force slightly higher than that of the room-temperature samples. In this case, the results are within a 5% error of the average field data, which is slightly higher than in our previous experiments, where only room temperature data were considered. A major outcome of our paper is the demonstration of the existence of friction forces after debonding, which are a result of radial stresses induced during the debonding process.

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Section: The Finite Element Simulationmentioning

confidence: 99%

Section: The Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigations of Cement Bonding Properties at Elevated Temperatures—The Effect of Sample Cooling

Lambrescu

Teodoriu

2022

Materials

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“…Meanwhile, positive pressure perforation was used in the downhole, which required the holding pressure in the wellbore to open the perforating tool; therefore, there was increased pressure in the wellbore. 35 After perforation was completed, a highdensity fluid circulation method was used to increase buoyancy in the wellbore and reduce the probability of causing an obstruction in the lifted perforating string.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Experiment and failure mechanism of cement sheath integrity under development and production conditions based on a mechanical equivalent theory

Huang

et al. 2021

Energy Science & Engineering

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During their life cycle, high-pressure gas wells experience circulating working fluid, acid fracturing, blow off, and other development and production conditions. This may lead to the failure of the cement sheath integrity and result in sustained casing pressure (SCP). Therefore, we explored the failure types and mechanisms of the cement sheath using different wellbore operating procedures. In this study, we used the downhole packer as the demarcation point; the integrity of the cement sheath at the upper and lower parts of the packer was tested through a self-developed wellbore simulation device, which is based on the equivalent theory of cement sheath interface differential pressure. Results showed that the lower part of the single-layer cement sheath underwent compressive strength failure due to the pressure drop in the wellbore before perforation. Plastic deformation of the cement sheath occurred during acid fracturing.In addition, the cooling effect caused by the acid fracturing led to the bonding failure at the cement sheath's second interface. The double-layer cement sheath's inner-layer cement sheath was subjected to tensile failure -attributed to highpressure -and the outer-layer cement sheath maintained its integrity under the pressure changes. Considering the risk factors associated with integrity failure, we propose an engineering optimization plan in the study. The retest results showed that reducing the internal casing pressure and temperature and controlling the annular pressure in the production stage was beneficial in ensuring the integrity of the cement sheath at the lower and upper parts of the packer, respectively. The research results provided an important reference for ensuring the integrity of the cement sheath of high-pressure gas wells.

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“…The Jones-Wilkins-Lee (JWL) equation is used for the calculation of explosion (Yu et al 1999;Yan et al 2020), where V is the volume of the charge, E is the initial ratio of internal energy and A 1 , B 1 , ω, R 1 and R 2 are material constants. 32 g RDX is used as explosive for the perforating shaped charge in DP36RDX25-2 perforating gun.…”

Section: Description Of Explosivementioning

confidence: 99%

Finite element modeling of the shaped charge jet and design of the reusable perforating gun

Zhang

Jin

2020

Pet. Sci.

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Finite element method is used to study the formations of the penetration jet, the bulge, and the burr in the designed reusable perforating gun. The attached layer of the soft metal on the perforator is studied for the controlling of the bulge height on the casing of the reusable perforating gun. Results indicate that the shaped charge jet is initially formed in the center of the shaped charge liner and then the material of the liner is driven to the centerline of the liner by the detonation wave. The attachment of the soft metal layer to the cartridge of the perforator can be beneficial to control the bulge height. The design on the blind holes on the casing can affect the burr height formed by the collision between the jet and the casing. With the increase in the liner angle, the penetration width on the cement wall of the wellbore is increased.

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Mechanical response and damage mechanism of cement sheath during perforation in oil and gas well

Cited by 33 publications

References 23 publications

Experimental and Numerical Investigations of Cement Bonding Properties at Elevated Temperatures—The Effect of Sample Cooling

Experimental and Numerical Investigations of Cement Bonding Properties at Elevated Temperatures—The Effect of Sample Cooling

Experiment and failure mechanism of cement sheath integrity under development and production conditions based on a mechanical equivalent theory

Finite element modeling of the shaped charge jet and design of the reusable perforating gun

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