Abstract
China-Kazakhstan pipeline is the first land import transnational crude oil pipeline in China. It is also the only long-distance crude oil channel connecting the resources in the west of Kazakhstan and the two refineries in the east of Kazakhstan and exports to China. It undertakes the dual responsibilities of crude oil supply of the two refineries in the east of Kazakhstan and the crude oil guarantee of refineries in Western China. At present, the annual throughput of China-Kazakhstan crude oil pipeline accounts for about 20% of China's onshore crude oil imports. Therefore, the pipeline’s safe, stable and efficient operation plays an important role in ensuring the strategic security of energy in Western China. Since the China-Kazakhstan crude oil pipeline has commissioned, it has been found that there is slack flow in the pipeline under different working conditions, which has a great impact on the safe and stable operation of the pipeline and the measurement accuracy of commercial trade. In this paper, the causes of slack flow in China-Kazakhstan crude oil pipeline are studied, the potential location of slack flow is analyzed, and the boundary conditions of slack flow condition are defined. At the same time, control strategies to avoid slack flow under different conditions are formulated by using simulation technology. The research results will provide direct technical case support for reasonable formulation of operation scheme of China-Kazakhstan crude oil pipeline system and terminal station inlet pressure control strategy, so as to ensure safe, stable and efficient operation of the pipeline.
Highlights
The China-Kazakhstan crude oil pipeline starts from Atyrau in the west of Kazakhstan, passes through Kenkiyak, Kumkol and Atasu, and ends at the oil pipeline of Alashankou metering station in Xinjiang, China
The following problems were found in the research process: [1] The whole pipeline of China-Kazakhstan crude oil pipeline has the characteristics of complex oil source composition and great difference in physical properties of different oil sources
OIL PHYSICAL PROPERTY TEST The whole pipeline of China-Kazakhstan crude oil pipeline has the characteristics of complex oil source composition and great difference in physical properties of different oil sources
Summary
The China-Kazakhstan crude oil pipeline starts from Atyrau in the west of Kazakhstan, passes through Kenkiyak, Kumkol and Atasu, and ends at the oil pipeline of Alashankou metering station in Xinjiang, China. By optimizing the equation fitting the pump factory characteristics, the head-flow characteristic parameters and efficiency-flow characteristic parameter curves of the pump are fitted, and 24 pumps in the whole line are fitted; the calibration method of factory characteristic curve of oil pump is studied, and the pump performance curve is corrected by screening the steady-state historical operation data, and the pump performance calculation and curve data automatic correction software are developed to ensure the simulation accuracy deviation from the actual value is less than 3%; [3] The whole line simulation model is established. The control strategy of slack flow of China-Kazakhstan crude oil pipeline is proposed by using transient simulation technology to ensure the safe operation of the pipeline and the measurement accuracy reaches the standard
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