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Wax deposition experimental device and method

A technology of experimental device and experimental method, applied in the direction of measurement device, flow characteristics, instrument, etc., can solve the problems of reduced pipeline transportation capacity, wax blocking accident, and increased pigging frequency.

Inactive Publication Date: 2016-02-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Wax deposition experimental device and method
  • Wax deposition experimental device and method

Examples

Experimental program
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Effect test

Embodiment approach 1

[0028] like figure 1 As shown, the present invention provides a wax deposition experimental device, which includes an oil storage tank 1, a cold finger 2 and an agitator 3, wherein: the oil storage tank 1 has an oil storage chamber 11, and the oil storage tank 1 is covered with a water Jacket interlayer 12, the water jacket interlayer 12 is connected with a first temperature controller 4; the cold finger 2 is arranged in the oil storage chamber 11, and the cold finger 2 has an inner cylinder 21 and is sleeved on the inner cylinder 21 outside the outer cylinder 22, an annular cavity 23 is formed between the inner cylinder 21 and the outer cylinder 22, and the annular cavity 23 is connected with a second temperature controller 5; the agitator 3 has a The rotating shaft 31 in the inner cylinder 21, the end of the rotating shaft 31 passing through the inner cylinder 21 is connected with a plurality of stirring paddles 32, and the stirring paddles 32 are located between the outer p...

Embodiment approach 2

[0071] like Figure 1~3 As shown, the present invention also provides an experimental method using the wax deposition experimental device described in Embodiment 1, the structure, working principle and beneficial effects of the wax deposition experimental device in this embodiment and the wax deposition experimental device in Embodiment 1 Same, no more details here. Described experimental method comprises the steps:

[0072] a) The temperature of the oil in the oil storage tank 1 is controlled at an experimental temperature by the first temperature controller 4;

[0073] b) The temperature of the water in the annular cavity 23 between the inner cylinder 21 and the outer cylinder 22 of the cold finger 2 is controlled to be lower than the oil temperature by the second temperature controller 5, and the water in the annular cavity 23 The temperature is lower than the waxing point temperature of the oil product and higher than the freezing point temperature of the oil product;

...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/04G01N11/00
CPCG01N15/04G01N11/00
Inventor 黄启玉吕志娟周泽婷
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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