Assessment of the cement failure probability using statistical characterization of the strength data

Moradi, Seyyed Shahab Tabatabaee; Nikolaev, N.I.

doi:10.1016/j.petrol.2018.01.040

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…(e) The cement sheath exhibits no sliding with the casing and formation before the generation of a microannulus. (f) The tensile stress direction is positive, while the compressive stress direction is negative 29,44 . The structure of the casing‐cement sheath formation is illustrated in Figure 6.…”

Section: Model Establishment and Experimental Parametersmentioning

confidence: 99%

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: Model Establishment and Experimental Parametersmentioning

confidence: 99%

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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“…Critical flow rate at which the flow goes into turbulent mode is calculated by formula: (3) where D-well diameter, m; d ex -drilling string external diameter, m; ρ-drilling mud density, kg/m 3 ; K-consistency coefficient.…”

Section: Calculation Of Equivalent Circulation Density (Ecd)mentioning

confidence: 99%

“…Analytical review of scientific and technical literatures in the field of complications and accidents during well construction [1][2][3][4], in particular, directional and horizontal wells, shows that to prevent the most frequent complications and accidents, first of all it is necessary to use high-quality drilling mud, which will correspond to geological and technical-technological conditions of drilling.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymer Reagents in the Drilling Fluids on the Efficiency of Deviated and Horizontal Wells Drilling

et al. 2020

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Improving the efficiency of well drilling process in a reservoir is directly related to subsequent well flow rates. Drilling of deviated and horizontal wells is often accompanied by an increase in pressure losses due to flow resistance caused by small size of the annular space. An important role in such conditions is played by the quality of borehole cleaning and transport capacity of drilling fluid, which is directly related to the rheological parameters of the drilling fluid. The main viscosifiers in modern drilling fluids are polymer reagents. They can be of various origin and structure, which determines their features. This work presents investigations that assess the effect of various polymers on the rheological parameters of drilling fluids. Obtained data are evaluated taking into account the main rheological models of fluid flow. However, process of fluid motion during drilling cannot be described by only one flow model. Paper shows experimentally obtained data of such indicators as plastic viscosity, dynamic shear stress, non-linearity index and consistency coefficient. Study has shown that high molecular weight polymer reagents (e.g., xanthan gum) can give drilling fluid more pronounced pseudoplastic properties, and combining them with a linear high molecular weight polymer (e.g., polyacrylamide) can reduce the value of the dynamic shear stress. Results of the work show the necessity of using combinations of different types of polymer reagents, which can lead to a synergetic effect. In addition to assessing the effect of various polymer reagents, the paper presents study on the development of a drilling fluid composition for specific conditions of an oil field.

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“…Since its discovery in 1903, cementing technology has made continuous development, but several problems still exist in oil-and gas-well cementing operations, such as bad mud displacement efficiency, annular gas channelling and cement sheath stress failure, etc. [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and performance evaluation of non-foaming styrene-acrylic latex for cementing slurry

Guo

Li³

et al. 2023

R. Soc. open sci.

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The latex used conventionally for oil-well cementing can lead to serious foaming issues in the cement slurry, which not only affects the accurate measurement of the density of the latex-containing cement slurry, but also is detrimental to cementing construction. A large amount of a foam stabilizer used for latex preparation is mainly responsible for foaming of the latex-containing cement slurry. In this study, soap-free emulsion polymerization was conducted using 2-acrylamido-2-methylpropanesulfonic acid (AMPS), styrene (St), and butyl acrylate (BA) as the reaction monomers and the effects of the AMPS dosage, monomer ratio, reaction temperature and stirring speed on the performance of the latex were investigated. The optimum synthesis conditions included a 30% monomer concentration, an St : BA : AMPS monomer ratio of 5 : 4 : 6, a synthesis temperature of 85°C, a stirring speed of 400 r.p.m. and 1.5% of the initiator. As-prepared latex exhibited good filtration loss control, excellent freeze–thaw stability, and extremely low foaming of the cement slurry with the added latex, which was extremely beneficial for on-site cementing construction.

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Assessment of the cement failure probability using statistical characterization of the strength data

Cited by 11 publications

References 12 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

Influence of Polymer Reagents in the Drilling Fluids on the Efficiency of Deviated and Horizontal Wells Drilling

Preparation and performance evaluation of non-foaming styrene-acrylic latex for cementing slurry

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