Analysis of the role of the isolation ball in the process of pushing the water from the oil pipeline with complex terrain

Energy Science & Engineering

Guo

Wang

et al. 2020

Self Cite

To explore the problem of the slack flow and waterhead having a huge impact on the low point of a pipeline during the water-filling process of a large-drop pipeline, the crossing section of the Nujiang China-Myanmar crude oil pipeline (for which the maximum height difference is 1480 m) is taken as an actual case, and water filling of an oil pipe segment with a large drop is simulated based on an OLGA multiphase flow transient simulation. The maximum velocity, pressure, and corresponding liquid holdup at different low points of the pipeline are studied, and the variations of water flow velocity, pressure, and liquid holdup with time at different low points under different load conditions are obtained. A stress analysis of the pipeline is performed through CAESAR II. The results showed that, when the volume flow rate was 900-2000 m 3 /h, the probability of slug flow in pipe could be reduced by 57%. Meanwhile, the tube pressure fluctuation and damage to the pipeline and equipment are reduced and pipeline transportation efficiency is improved, thereby providing an effective basis for engineering practice.

Section: Mathematical Modelmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the water‐filling process for crude oil pipelines with a large drop in height

Energy Science & Engineering

Guo

Wang

et al. 2020

Self Cite

“…When solving the air cooler outlet temperature, it is only necessary to solve the temperature drop value of the air cooler to the hot fluid natural gas by fitting the formula, instead of performing a large number of iterative calculations based on the heat transfer calculation process, which greatly simplifies the heat transfer calculation process. The method used in this article can be used not only for the calculation of natural gas pipeline systems, but also for the analysis of the production process of oil and gas pipelines, [39][40][41] and the analysis and calculation of air coolers in gas storage systems. [42][43][44]…”

Section: Formula Correctionmentioning

confidence: 99%

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

Energy Science & Engineering

Guo

et al. 2020

Self Cite

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

“…At present, China’s large-scale natural gas pipelines have reached 76 000 km, such as the west–east gas pipeline and the China–Myanmar pipeline. − In the compressor station of the natural gas pipeline, the vibration of the station pipeline will be caused by the fluctuation of pressure and flow, the pulsation of air caused by the unstable operation of the compressor equipment, and other reasons. Slight vibration can be treated by the support and damping device and will not cause damage to the pipeline system.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Research on Pipeline Vibration of a Natural Gas Compressor Station and Vibration Reduction Measures

Wang

Zhao³

et al. 2020

Energy Fuels

Self Cite

The abnormal vibration of natural gas station pipelines seriously threatens the safety of pipeline transportation, and improper handling will cause huge economic losses. For the abnormal vibration of the pipeline, reasonable treatment must be carried out. The Yongchang gas station belongs to the west–east gas pipeline system in China. Since its production, abnormal vibration has often occurred in the west-third outbound pipeline of the Yongchang gas station, and the vibration changes according to the different gas transport volumes. In this paper, the outbound pipeline of the Yongchang pressure station is taken as the research object, and the vibration analysis of the station yard pipeline is carried out. The numerical model of the station yard pipeline is established, and the correctness of the model is verified by the field vibration test. The fluid–solid coupling method is used to analyze pipeline vibration under different working conditions. Then, three kinds of vibration reduction schemes are proposed and verified by simulation. The main conclusions are as follows: (1) The fluid pressure fluctuation in the pipeline is the root cause of abnormal vibration in the station. (2) When the gas transmission volume is large, the vibration of the pipeline system will become more severe. (3) The scheme of increasing pipe diameter and adding appropriate constraints has the best vibration reduction effect.