Wax deposition experimental device and method

Abstract

The invention provides a wax deposition experimental device and method. The wax deposition experimental device comprises an oil storage tank, a cold finger and a stirrer. The oil storage tank is provided with an oil storage cavity and sleeved with a water jacket interlayer, and the water jacket interlayer is connected with a first temperature control device. The cold finger is arranged in the oil storage cavity and is provided with an inner cylinder and an outer cylinder which is arranged outside the inner cylinder in a sleeving mode, an annular cavity is formed between the inner cylinder and the outer cylinder, and the annular cavity is connected with a second temperature control device. The stirrer is provided with a rotating shaft penetrating in the inner cylinder, and the end, penetrating out of the inner cylinder, of the rotating shaft is connected with a plurality of stirring paddles. The stirring paddles are located between the outer peripheral wall of the cold finger and the inner peripheral wall of the oil storage tank. According to the wax deposition experimental device and method, the wax deposition laws of crude oil and an oil-water mixture under the flowing condition can be determined, and it is of great significance to pipeline safety and economic operation.

Description

technical field [0001] The present invention relates to an experimental device and an experimental method, in particular to a wax deposition experimental device and an experimental method for studying wax deposition under oil flow conditions. Background technique [0002] Waxy crude oil is a complex mixed system, which is mainly composed of wax, gum, aromatic hydrocarbon, asphalt and light hydrocarbon components. When the temperature is high, the wax component in the crude oil is in a dissolved state, and the crude oil exhibits Newtonian fluid rheological properties. As the temperature decreases, the wax component gradually crystallizes and precipitates, and the viscosity of the crude oil increases accordingly, and has a non-Newtonian fluid characteristics. When the amount of wax crystals precipitated reaches 2% to 3%, a three-dimensional network structure can be formed, which wraps liquid crude oil in it, hinders its flow, and causes the crude oil to lose its fluidity as a...

AI Technical Summary

Problems solved by technology

The above wax deposition process has brought a series of problems to the pipeline transportation of waxy crude oil: the effective inner diameter of the pipeline is reduced, the transmission pressure is increased, the pipeline transmission capacity is reduced, the frequency of pigging is increased, and even wax plugging accidents are caused

Moreover, under the condition of low outbound oil temperature and low delivery volume, waxy crude oil transported by pipelines is prone to changes in flow pattern and flow state, which will affect the pressure drop of the pipeline and increase the operating cost of the pipeline

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