Analytical and Numerical Study of Casing Collapse in Iranian Oil Field

Abdideh, Mohammad; Khah, Soheila Hedayati

doi:10.1007/s10706-017-0428-0

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…Using the technique of initial parameters [60], solutions of Equations ( 1)-(3) satisfying conditions (4), (5), and (7) were constructed in the following form:…”

Section: Results and Analysismentioning

confidence: 99%

“…The human factor has been identified as the most common cause of catastrophic accidents in the oil and gas industry [4]. However, there are threats that are relatively independent of human impact, for example, the destruction of casing strings due to landslides [5,6] or the collapse of deep wells built in unstable formations such as mudstones, bischofites, shales and layers of plastic mineral salt [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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One of the main problems of well operation is the risk of uncontrolled leakage of hydrocarbons into the environment. This problem is especially relevant for the long-term operation of wells. The idea for this study was inspired by a real industrial problem that the authors of the article were involved in solving. At several operating gas wells, an abnormal slope of the production tree occurred, which raised the question of the safety of their further operation. An analysis of known studies and current regulatory documents did not allow us to assess the safety of using a gas well based on the measured kinematic parameters of production tree deviations. A mathematical model for the deformation of a package of casing strings when the surface layer of the rock is displaced is developed in the article. A boundary value problem is formulated for differential equations of pipe bending on an elastic foundation. Based on the results of solving this problem, an unambiguous relationship was established between the maximum bending stress in the surface pipe and the angle of inclination of the production tree. The quantitative characteristics of the connection depend on the geometric and mechanical properties of the pipes and on the thickness and mechanical parameters of the formations. It was established that the existing inclination of the production tree can be achieved due to the beginning of the plastic bending of the surface pipe under the slickenside, which does not exclude the exhaustion of the safety margin of the surface pipe and indicates the possible operation of the casing string in a pre-emergency state. In general, the obtained results develop analytical approaches to assessing the behavior of underground structures of a production well in unstable soil bodies.

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“…Using the technique of initial parameters [60], solutions of Equations ( 1)-(3) satisfying conditions (4), (5), and (7) were constructed in the following form:…”

Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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“…The industry standard approach to differentiating these collapses are based on slenderness ratio which is a ratio (casing diameter to its thickness). However, Abdideh and Khah (2018) presents casing collapse phenomena as abnormal displacements of rock formations on the casing leading to collapse. Bastola et al (2014) examined the factors influencing pipe's collapse resistance and concluded that effects are small for 3D models with length to diameter (d/t) ratios above 10, and that an increase in initial ovality would lead to a decrease in the pipe's resistance to collapse.…”

Section: Collapse/burst Failurementioning

confidence: 99%

Casing structural integrity and failure modes in a range of well types - A review

Mohammed

Oyeneyin

Atchison

et al. 2019

Journal of Natural Gas Science and Engineering

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This paper focus on factors attributing to casing failure, their failure mechanism and the resulting failure mode. The casing is a critical component in a well and the main mechanical structural barrier element that provide conduits and avenue for oil and gas production over the well lifecycle and beyond. The casings are normally subjected to material degradation, varying local loads, induced stresses during stimulation, natural fractures, slip and shear during their installation and operation leading to different kinds of casing failure modes. The review paper also covers recent developments in casing integrity assessment techniques and their respective limitations.The taxonomy of the major causes and cases of casing failure in different well types is covered. In addition, an overview of casing trend utilisation and failure mix by grades is provided. The trend of casing utilisation in different wells examined show deep-water and shale gas horizontal wells employing higher tensile grades (P110 & Q125) due to their characteristics. Additionally, this review presents casing failure mixed by grades, with P110 recording the highest failure cases owing to its stiffness, high application in injection wells, shale gas, deep-water and high temperature and high temperature (HPHT) wells with high failure probability. A summary of existing tools used for the assessment of well integrity issues and their respective limitations is provided and conclusions drawn.

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“…Several factors such as corrosion, creation of load on the casing due to lacking proper cementation, reservoir subsidence, and casing material may lead to casing collapse [2][3][4]. The maximum resistance to in-situ horizontal stresses in casing can be generated by applying special alloys and the implementation of efficient concrete operations [5]. The other event which threatens the integrity of oil and gas transmission is pipelines bursting.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Backscatter Radiography for Prediction of Pipelines Situation: Their Bursting and Casing Failure Consideration from inside

2022

IJE

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Backscatter radiography as a technique can successfully be applied for predicting the pipeline bursting and casing failure. A valid numerical technique will allow predicting these issues without needing to access the outside of the pipelines. Furthermore, this technique has the ability to estimate the shape and depth of damages. It is normally preferred to apply non-destructive testing (NDT) methods which can monitor the status of a pipeline from the internal surface of it without needing to access both sides of it depending on various locations of pipe such as underground or submarine. In the current study, backscatter radiography as an applicable and NDT method to detect locations with potential for pipeline bursting or casing failure was carefully investigated using the Monte Carlo simulation tool. T he data obtained by the simulation process showed that backscatter radiography could detect deformations, corroded areas, depositions, creation of load on the casing, lacking proper cementation, excessive pressure inside the pipelines, and other factors which may increase the risk of pipelines bursting or casing failure (in-situ and online) with an acceptable accuracy.

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Analytical and Numerical Study of Casing Collapse in Iranian Oil Field

Cited by 7 publications

References 16 publications

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Casing structural integrity and failure modes in a range of well types - A review

Numerical Analysis of Backscatter Radiography for Prediction of Pipelines Situation: Their Bursting and Casing Failure Consideration from inside

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