A Comparison Between Carson's Formulae and a 2d Fem Approach for the Evaluation of Ac Interference Caused by Overhead Power Lines on Buried Metallic Pipelines

Cristofolini, Andrea; Popoli, Arturo; Sandrolini, Leonardo

doi:10.2528/pierc17080501

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…The magnetic field strength in the external area of pipe is significantly stronger than that in the internal area. [32][33][34] Under ideal conditions, assuming the pipe is with infinite length and the magnetic shielding coefficient is recorded as the ratio of external magnetic field of pipe to internal magnetic field of pipe, which can be calculated by using Equation (6). When the magnetic induction line is parallel to the iron pipe, the magnetic induction line in the air will not bend toward the ferromagnetic material, so the axial magnetic shielding coefficient can be taken as 1.…”

Section: Magnetic Shielding Analysismentioning

confidence: 99%

Magnetization influence analysis of the casing and drill pipe in shale gas dual horizontal well Rotating Magnet Ranging System drilling process

Wei

2020

Energy Science & Engineering

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Rotating Magnet Ranging System (RMRS) is one of the core guiding technologies for shale gas extraction, and its magnetic measurement data will inevitably be affected by the downhole magnetic objects in the target magnetic field. The casing and drill pipe, which are apt to be magnetized by the magnetic sub, are major influencing factors of the measurement results. In order to study the influence comprehensively, a dual horizontal well RMRS drilling model is established. Based on static magnetic dipole theory, the magnetic field distribution equation of the low‐rotational magnetic sub is deduced and characterized. Firstly, the casing and drill pipe were segmented into ring, layer, and block volume elements. Then according to the dynamic magnetic dipole field distribution equation, the magnetic field strength of the magnetic source at the volume element (equivalent magnetic dipole) and the sensor was calculated, as well as the magnetic strength of independent magnetization field and superposition magnetization field of casing and drill pipe at the sensor position. Finally, the effectiveness of the numerical method results was verified by outdoor experiments, and the shielding effect of the static magnetic shielding on the external magnetic field of casing was preliminarily analyzed. The research results indicate that the magnetic sub has a strong magnetization effect on the casing and drill pipe. The magnetization field of the casing is about 2.39 times stronger than that of the drill pipe, and they will seriously affect the sensor measurement data. When the well spacing is small, the magnetization field waveform will be distorted. With the increase of the well spacing d, the waveform gradually changes sinusoidally, the fluctuation period of the magnetization field also gradually becomes twice (d > 1.5 m) that of the magnetic source, and the peak value of the magnetization field decreases exponentially. A preliminary analysis of the magnetic shielding of casing revealed that the magnetic shielding would cause great attenuation to the strength of the magnetic source. The numerical simulation proposed in this paper provides a theoretical basis for the error analysis of RMRS, which is of great significance for measurement correction and accuracy improvement.

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Section: Magnetic Shielding Analysismentioning

confidence: 99%

Magnetization influence analysis of the casing and drill pipe in shale gas dual horizontal well Rotating Magnet Ranging System drilling process

Wei

2020

Energy Science & Engineering

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“…Overall, researchers have studied this topic for several decades, and many modeling efforts have been made throughout the years. Much of the initial efforts in this field originated from circuital or transmission line approaches based on Carson's formulae for mutual impedance [13][14][15][16]. These methods are also generally based on performing a discretization of the considered corridor into sets of coupled smaller sections, described by lumped parameters [17]; such circuital approaches are computationally efficient, making them suitable for fast evaluations or parametric studies.…”

Section: Introduction Concerns Over Metallic Pipelines Integritymentioning

confidence: 99%

FLARE: A Framework for the Finite Element Simulation of Electromagnetic Interference on Buried Metallic Pipelines

Popoli,

Pierotti,

Ragazzi

et al. 2023

Applied Sciences

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The functionality of buried metallic pipelines can be compromised by the electrical lines that share the same right-of-way. Given the considerable size of shared corridors, computer simulation is an important tool for performing risk assessment and mitigation design. In this work, we introduce an open-source computational framework for the analysis of electromagnetic interference on large earth-return structures. The developed framework is based on FLARE—an efficient finite element solver developed by the authors in MATLAB®. FLARE includes solvers for problems involving static electric and magnetic fields, and DC and time-harmonic AC currents. Quasi-magnetostatic transient problems can be studied through time-marching or—for linear problems—with an efficient inverse-Laplace approach. In this work, we succinctly describe the optimization of time-critical operations in FLARE, as well as the implementation of a transient solver with automatic time-stepping. We validate the numerical results obtained with FLARE via a comparison with the commercial software COMSOL Multiphysics®. We then use the validated time-marching analysis results to test the accuracy and efficiency of three numerical inverse-Laplace algorithms. The test problem considered is the assessment of the inductive coupling between a 500 kV transmission line and a metallic pipeline buried in the soil.

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“…These algorithms are mainly based on the transmission line model for both inducing and induced plants. Afterwards, other algorithms based on Finite Element Method (FEM) have been proposed [10][11][12][13], and more recently, some theoretical evaluations of the AC induced corrosion risk have been presented in [14,15].…”

Section: Introductionmentioning

confidence: 99%

Ac Corrosion on Pipelines: Influence of the Surface Layer Soil Resistivity in Evaluating the Current Density by a Probabilistic Approach

Lucca¹

2019

PIER M

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The context of the paper is the 50-60 Hz electromagnetic interference between AC power lines/electrified railway lines and pipelines; we present here an algorithm for the evaluation of the AC induced current density, flowing through the holidays (defects) in the pipeline insulating coating, from pipe to soil by modelling this last one as a two-layer structure. Moreover, the value of holidays area is treated as a random variable (as actually is from field experience) so allowing to associate a certain level of probability to the event of exceeding the AC current density limit, established by standards, for AC corrosion risk. The results show that the surface layer soil resistivity is a very significant factor influencing the level of AC induced current density.

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A Comparison Between Carson's Formulae and a 2d Fem Approach for the Evaluation of Ac Interference Caused by Overhead Power Lines on Buried Metallic Pipelines

Cited by 12 publications

References 7 publications

Magnetization influence analysis of the casing and drill pipe in shale gas dual horizontal well Rotating Magnet Ranging System drilling process

Magnetization influence analysis of the casing and drill pipe in shale gas dual horizontal well Rotating Magnet Ranging System drilling process

FLARE: A Framework for the Finite Element Simulation of Electromagnetic Interference on Buried Metallic Pipelines

Ac Corrosion on Pipelines: Influence of the Surface Layer Soil Resistivity in Evaluating the Current Density by a Probabilistic Approach

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