Experiment and Dynamic Simulation of PIG Motion during Pigging Operation in a Slope Pipeline
-
Jun Zhou
,
Tao Deng
,
Guangchuan Liang
Abstract
Pigging techniques are widely used in the oil and gas industry. The unsteady motion of the PIG in an undulating pipe section during the pigging process after a water pressure test affects the stable operation of the pipeline and also causes a pipe rupture accident in serious cases. First, an experimental study was conducted to investigate the pigging process of air–water two phase pipe flows, and the PIG reverse movement and hydraulic pulse phenomenon were observed. Subsequently, a hydraulic transient model of the pigging process after a water pressure test was established in a dual-grid system. The model combined mass and motion equations of gas and liquid and PIG dynamic equations, considered three types of PIG motion states, namely positive movement, reverse movement and still, and used the method of characteristics to solve the equations. The model exhibits the ability for PIG tracing and hydraulic pulse prediction. It can be used to obtain the position and speed of the PIG. Finally, the field data and simulation results were compared, and the results indicated that they are essentially identical. This verified the accuracy of the model that is established in this study and the reliability of computed results and provided a reliable and effective theoretical basis for the development of field pigging plans.
Nomenclature
- A Cross-section area of the pipeline (m2)
- f Friction factor
- m Index number of the Darcy formula
- a Acoustic speed of the fluid (m/s)
- t Time (s)
- x Distance along the pipeline (m)
- P Pressure (Pa)
- g Gravity acceleration (m·s-2)
- D Diameter of the pipeline (mm)
Acknowledgements
The authors would like to express sincere acknowledgements to the National Natural Science Foundation of China (51704253) and the Young Scholars Development Fund of SWPU (201599010096) for the financial support in this project.
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- Modeling of Fluid Bed Reactor of Ethylene Di Chloride Production in Abadan Petrochemical Based on Three-Phase Hydrodynamic Model
- Optimization and Reaction Kinetics Studies on Copper-Cobalt Catalyzed Liquid Phase Hydrogenation of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran
- Role of Fe(III) and Oxalic Acid in the photo-Fenton System for 3-Methylphenol Degradation in Aqueous Solution under Natural and Artificial Light
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