Experimental device and method for wax precipitation of pipeline

Abstract

The embodiment of the invention provides an experimental device and method for the wax precipitation of a pipeline. The experimental device comprises oil storage equipment, first temperature control equipment, liquid supply equipment, flow measurement equipment, a testing section, a reference section, second temperature control equipment, third temperature control equipment and a plurality of pressure and temperature measurement equipment, wherein the first temperature control equipment is connected with the oil storage equipment and used for controlling the temperature of oils at predetermined temperature; the liquid supply equipment outputs the oils at predetermined flow when the temperature of the oils reaches the predetermined temperature; the testing section is provided with a first inlet and a first outlet, wherein the first inlet is connected with the flow measurement equipment through a pipeline; the reference section is provided with a second inlet and a second outlet, wherein the second inlet is connected with the first outlet through a pipeline, and the second outlet is connected with the oil storage equipment through a pipeline; the second temperature control equipmentcontrols the temperature of the testing section lower than the temperature of wax precipitation points of the oils and the temperature of the oils inside the testing section; and the third temperature control equipment controls the temperature of the reference section to be higher than the temperature of the wax precipitation points of the oils and the temperature of the oils inside the referencesection. The experimental device can be used for accurately measuring the wax precipitation amount and the wax precipitation rate inside the pipeline.

Description

technical field [0001] The embodiment of the present invention relates to a pipeline wax deposition experiment device and method, which are suitable for multiphase flow, single-phase flow wax deposition experimental research and multiphase flow flow pattern measurement. 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 to hinder the flow of crude oil, resulting in the overall loss of fluidity an...

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Problems solved by technology

[0003] 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

The present invention finds in the process of realizing the present invention that the experimental device and experimental method of the prior art cannot accurately measure the wax deposition thickness and wax deposition rate in the pipeline, nor can it be used to study the wax deposition law

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