Quantitative experimental device and method for wax deposition under pipeline transportation conditions

Abstract

The invention provides a qualitative wax deposition experimental device and a qualitative wax deposition experimental method under pipeline transportation conditions. The qualitative wax deposition experimental device under pipeline transportation conditions comprises an oil storage tank, a wax deposition main body and a pump, wherein a water jacket interlayer is formed in the outer side of the oil storage tank in a sleeved manner and is connected with a first temperature controller; the wax deposition main body comprises an upper tank body and a lower tank body; the upper tank body is provided with an upper water flow chamber; the upper water flow chamber is connected with a second temperature controller; the lower tank body is a tank body of which the upper end is open; the upper tank body is connected to the opening of the lower tank body in a sealed manner; a clapboard is arranged in the lower tank body; the lower tank body above the clapboard is an experimental cavity; the lower tank body below the clapboard is a lower water flow chamber; the lower water flow chamber is connected with a third temperature controller; the inlet end of the experimental cavity and the outlet end of the experimental cavity are respectively communicated with the oil storage tank; and the pump is connected between the inlet end of the experimental cavity and the oil storage tank. The device disclosed by the invention is capable of measuring the wax deposition rule of crude oil and oil-water mixtures under simulated pipeline transportation conditions and has significance on pipeline safety and economic operation.

Description

technical field [0001] The present invention relates to an experimental device and an experimental method, in particular to an experimental device and an experimental method for quantifying wax deposition under pipeline transportation conditions for studying wax deposition under petroleum pipeline transportation 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 cr...

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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