Formation Mechanism of Trailing Oil in Product Oil Pipeline

Much less attention has been focused on the particle deposition in rectifying plate though it is a common problem in shale gas pipe systems. The effects of particle parameter and flow field on the deposition and distribution of particle in a new‐type rectifying plate system are investigated. Both the computational fluid dynamics (CFD) method and the experiment method are used in order to analyze the particle deposition under various conditions. The accuracy of simulation model is verified with measurements in the experiment and from analyzing, and it is found that the Boltzmann equation can well describe the relationship between gas Reynolds number and particle deposition in the rectifying plate system. It is also found from investigation that the particle deposition is greatly affected by the particle parameter. Deposition rate rises with the increase of the particle diameter; however, it reduces gradually with the decrease of particle shape factor. Moreover, the particle mass concentration is an essential dimension that can give a prediction of where the particle may deposit.

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“…In the simulation, kinetic energy of turbulence (

k

) and turbulent dissipation energy ( ε ) are used to restrict turbulent fluctuation and are shown as follows:

U_{j} \frac{\partial k}{\partial x_{j}} = \frac{\partial}{\partial x_{j}} (\frac{v_{t}}{σ_{k}} \frac{\partial k}{\partial x_{j}}) + v_{t} (\frac{\partial U_{i}}{\partial x_{j}} + \frac{\partial U_{j}}{\partial x_{i}}) \frac{\partial U_{i}}{\partial x_{j}} - ε

U_{j} \frac{\partial ε}{\partial x_{j}} = \frac{\partial}{\partial x_{j}} (\frac{v_{t}}{σ_{k}} \frac{\partial k}{\partial x_{j}}) + \frac{ε}{k} [C_{ε 1} v_{t} (\frac{\partial U_{i}}{\partial x_{j}} + \frac{\partial U_{j}}{\partial x_{i}}) \frac{\partial U_{i}}{\partial x_{j}} - C_{ε 2} ε]

…”

Section: Deposition Mechanism and Mathematical Modelmentioning

confidence: 99%

“…In the simulation, kinetic energy of turbulence (k) and turbulent dissipation energy (ε) are used to restrict turbulent fluctuation 26,27 and are shown as follows:…”

Section: Model Of Fluid Phasementioning

confidence: 99%

Analysis of particle deposition in a new‐type rectifying plate system during shale gas extraction

Peng

Chen

Zheng³

et al. 2019

Energy Science & Engineering

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“…Pei et al simulated the erosion in pipe elbows and have given the position of maximum erosion; the abrasive terms in erosion simulation are proved necessary, and the particle impact angles are generally low in transportation of dense gas . Peng et al studied the particle trajectories in erosion simulation by combining eight erosion models and two rebound models, and have found the prediction of the maximum erosion zone in this paper; Laín et al studied the bend erosion with the approach of Euler/Lagrange and found that the roughness of wall can reduce the penetration ratio; Zeng et al used the CFD‐DEM coupling way to study the motion of sulfur particles in the gas flow; Liu et al used CFD to study the diffusion rule of two different oils in tee pipe; Duarte et al studied the relationship between collision of interparticles and the elbow erosion with the numerical simulation; Vieira et al combined the PIV technique and the sand erosion experiment, then simulated the erosion and gave the prediction of erosion; in the study of Duarte et al the particle erosion in the pipe elbow was investigated, and the conclusion indicated that the collision of inner particles can effectively reduce the erosion in the elbow.…”

Section: Introductionmentioning

confidence: 94%

Numerical analysis of particle erosion in the rectifying plate system during shale gas extraction

Peng

Chen

Shan³

et al. 2019

Energy Science & Engineering

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Erosion caused by sand particles in the pipe system is a major concern in the shale gas industry. In the rectifying plate system, the fluid with high Reynolds number is assumed to be the fully turbulent flow. To investigate particle erosion under the complex flow in the rectifying plate system, various erosion simulations are conducted in this study. Because the gas velocity, sand input, particles size, and particles shape can affect the erosion in rectifying system, the effect of gas velocities (5‐30 m/s), sand inputs (50‐400 kg/d), and particle parameters (various particle sizes and various particle shapes) on erosion is simulated. Moreover, the erosion experiment conducted in Tulsa University is used to verify the accuracy of simulation model. Through the calculation and analysis, it is obtained that different gas velocities will change the position where the max erosion rate appears. Various sand inputs lead to different max erosion rates. In addition, the effect of sand input on the distribution of erosion scars on rectifying plate is more obvious than that of on elbows. Finally, the effect of size and shape of particles on erosion is investigated. It is found that with the increase in particle diameter, the shape of erosion scar on elbow 1 changes gradually from an ellipse to the V‐shape.

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“…At present, many scholars have used Fluent flow field analysis software to conduct a large number of numerical simulation calculations on air cooler, pipeline, and other flow fields, proving the feasibility of this method. [31][32][33][34][35][36] Therefore, this paper adopts the numerical simulation method, taking the dry air cooler configured in the West-East Natural Gas Pipeline II as an example, using CFD software to carry out three-dimensional modeling and meshing of air-cooled finned tubes.…”

Section: Physical Modelmentioning

confidence: 99%

Numerical simulation and simplified calculation method for heat exchange performance of dry air cooler in natural gas pipeline compressor station

Liu

Guo

et al. 2020

Energy Science & Engineering

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In view of the complicated heat transfer calculation for air coolers and the difficulty of directly calculating the exit temperature of natural gas in a compressor station, taking the dry air cooler of model GP12 × 3-6-258-13.0S-S-23.4/DR-Ia configured in the West-East Natural Gas Pipeline II as an example, a three-dimensional simplified model of the air cooler is established. The model is used to simulate a temperature flow field of a dry air cooler-finned tube based on Fluent flow field analysis software. This paper studies the cooling effect of the dry air cooler-finned tube on high-temperature and high-pressure natural gas at compressor outlet. By comparing and analyzing the relationships among natural gas mass flow, inlet air temperature, inlet natural gas temperature, and outlet natural gas temperature for an air cooler, the formula of temperature drop of dry air cooler to natural gas is fitted, and the fitting formula is verified by field operation data. The results show that the average error between the fitting results and the actual data is less than 1.5%, which proves the correctness of the fitting formula and greatly simplifies the heat transfer calculation process for air coolers. K E Y W O R D Sdry air coolers, finned tube, optimization, outlet natural gas temperature

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Formation Mechanism of Trailing Oil in Product Oil Pipeline

Cited by 62 publications

References 28 publications

Analysis of particle deposition in a new‐type rectifying plate system during shale gas extraction

Analysis of particle deposition in a new‐type rectifying plate system during shale gas extraction

Numerical analysis of particle erosion in the rectifying plate system during shale gas extraction

Numerical simulation and simplified calculation method for heat exchange performance of dry air cooler in natural gas pipeline compressor station

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