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Method and system for determining total viscosity-temperature curve of crude oil

A viscosity-temperature curve and determination method technology, which is applied in the field of the determination method and system of the full viscosity-temperature curve of crude oil, can solve the problems such as difficulty in meeting the requirements of the full viscosity-temperature curve of the pipeline, inability to adapt, and ignoring the viscosity change in the temperature range of crude oil.

Pending Publication Date: 2020-11-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The formula fitted by the above method simply fits the relationship between crude oil viscosity, temperature and shear rate from the perspective of data only through the change trend of viscosity. Although the wax content in waxy crude oil is also taken into account, it does not Other physical properties of waxy crude oil are used to predict the viscosity of waxy crude oil, and it is difficult to explore the reasons that affect the viscosity of crude oil from the perspective of crude oil physical properties
Secondly, the existing research only focuses on specific waxy crude oil, and once the formula form obtained is fixed, its scope of application is limited, and it cannot be adapted to crude oil samples that need to predict viscosity in the future
Thirdly, the existing crude oil viscosity prediction does not take into account the viscosity change of crude oil in the non-Newtonian fluid and Newtonian fluid temperature range, and it is difficult to meet the full viscosity-temperature curve required for actual pipeline transportation

Method used

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  • Method and system for determining total viscosity-temperature curve of crude oil
  • Method and system for determining total viscosity-temperature curve of crude oil
  • Method and system for determining total viscosity-temperature curve of crude oil

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Experimental program
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Effect test

Embodiment 1

[0085] figure 1 A flow chart of a method for determining the full viscosity-temperature curve of crude oil provided in Embodiment 1 of the present invention, such as figure 1 Shown, the full viscosity-temperature curve determining method of a kind of crude oil of the present invention comprises:

[0086] S101, acquiring the density value and freezing point value of crude oil.

[0087] S102. Using the crude oil Newtonian fluid viscosity-temperature coefficient prediction model according to the density value and the freezing point value, determine the Newtonian fluid state viscosity-temperature coefficient; the crude oil Newtonian fluid viscosity-temperature coefficient prediction model is based on quantum particle swarm optimization algorithm and generalized A recurrent neural network is built.

[0088] S103, acquiring the wax content of the crude oil.

[0089] S104, according to the viscosity-temperature coefficient of the Newtonian fluid state and the wax content, the visc...

Embodiment 2

[0109] In order to achieve the above object of the present invention, the present invention provides Embodiment 2.

[0110] 1. Calculation of viscosity-temperature coefficient

[0111] For waxy crude oil, heating and transportation technology is generally used for long-distance pipeline transportation. According to the national standard GB50253-2014, when heating is required for transportation, the transportation temperature of crude oil at each point along the pipeline should be 3°C to 5°C higher than the freezing point of crude oil. Therefore, the oil transportation temperature may be lower than the crude oil anomalous point, that is, the crude oil is transported in a non-Newtonian fluid state. Therefore, for crude oil transported by pipeline, the oil transport temperature t can be divided into two intervals, see formula 4-1:

[0112]

[0113] Among them, t R is the temperature when the crude oil leaves the station, t F is the temperature of the abnormal point of crud...

Embodiment 3

[0181] The present invention also provides a system for determining the full viscosity-temperature curve of crude oil, such as Figure 5 As shown, the full viscosity-temperature curve determination system includes:

[0182] Crude oil density value and freezing point value acquisition module 1 is used to obtain the density value and freezing point value of crude oil.

[0183] The Newtonian fluid state viscosity-temperature coefficient determination module 2 is used to determine the Newtonian fluid state viscosity-temperature coefficient according to the density value and the freezing point value using a crude oil Newtonian fluid viscosity-temperature coefficient prediction model; the crude oil Newtonian fluid viscosity-temperature coefficient prediction The model is established based on quantum particle swarm optimization algorithm and generalized regression neural network.

[0184] The crude oil wax content obtaining module 3 is used to obtain the wax content of crude oil.

...

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Abstract

The invention relates to a method and system for determining a total viscosity-temperature curve of crude oil. The method comprises the following steps: acquiring a density value and a condensation point value of crude oil; determining a Newtonian fluid state viscosity-temperature coefficient by adopting a crude oil Newtonian fluid viscosity-temperature coefficient prediction model according to the values; determining a non-Newtonian fluid state viscosity-temperature coefficient by adopting the crude oil non-Newtonian fluid viscosity-temperature coefficient prediction model according to the Newtonian fluid state viscosity-temperature coefficient and a wax content; selecting a temperature value greater than a crude oil abnormal point temperature value from the crude oil temperature set as acrude oil Newtonian fluid temperature set, using the rest as a crude oil non-Newtonian fluid temperature set; determining a crude oil Newtonian fluid temperature interval viscosity-temperature curveaccording to the crude oil Newtonian fluid temperature set and the Newtonian fluid state viscosity-temperature coefficient; and determining a crude oil non-Newtonian fluid temperature interval viscosity-temperature curve according to the crude oil non-Newtonian fluid temperature set and the non-Newtonian fluid state viscosity-temperature coefficient. According to the method, the total viscosity temperature curve of the crude oil is obtained, and the safety of crude oil pipeline transportation and storage is guaranteed.

Description

technical field [0001] The invention relates to the technical field of crude oil exploration, in particular to a method and system for determining the full viscosity-temperature curve of crude oil. Background technique [0002] The viscosity of crude oil is a key parameter in the safe transportation and storage of crude oil. On the one hand, for long-distance oil pipelines, the increase of oil viscosity will increase the frictional resistance of the pipeline along the flow direction, and the energy consumption of transportation will increase, and when the viscosity of oil fluctuates, it may cause fluctuations in the load of motors and oil pumps. The motor and oil pump deviate from the high-efficiency working area to cause waste. On the other hand, when an offshore tanker unloads oil at the terminal, if the viscosity of the crude oil is too high, it will bring major safety hazards to the unloading, storage and subsequent pipeline transportation of the crude oil terminal. Es...

Claims

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Application Information

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IPC IPC(8): G06F17/17G06F17/18G06F30/20G06N3/00G06N3/08G01N11/00
CPCG06F17/18G06F17/17G06F30/20G01N11/00G06N3/006G06N3/08G01N2011/0026G01N2011/0093
Inventor 姚博张健铭李传宪杨飞孙广宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)