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Deep electric desalting and dewatering method of heavy high-acid crude oil

A technology for electrical desalination and dehydration and high-acid crude oil, which can be applied in the fields of electric/magnetic dehydration/demulsification, and electric/magnetic refining, etc., which can solve the problems such as the inability to meet the salt content of the desalted crude oil and the difficulty of desalting heavy high-acid crude oil. , to achieve the effect of saving power consumption and strong adaptability

Inactive Publication Date: 2017-03-15
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a deep electric desalting and dehydration method for heavy high-acid crude oil. As the conventional AC and DC desalting technology can no longer meet the target of salt content of crude oil <3mg / L after desalination, the method of the present invention can easily Solve the difficult problem of desalting heavy high-acid crude oil well

Method used

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  • Deep electric desalting and dewatering method of heavy high-acid crude oil
  • Deep electric desalting and dewatering method of heavy high-acid crude oil
  • Deep electric desalting and dewatering method of heavy high-acid crude oil

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Embodiment 1

[0034] The density of a certain crude oil is 966.5kg / m 3 , the acid value is 3.32mgKOH / g, and the salt content is 22.0mg / L. The desalination process conditions are: crude oil temperature 130°C, water injection volume 3.5wt%, water injection is fresh water pH 7, water injection temperature 90°C, oil-soluble demulsifier FO 6 The dosage is 10μg / g, the mixing intensity is 45KPa, the field strength of variable frequency power supply is 120V / cm, the frequency of variable frequency power supply is 1500Hz, the field strength of AC and DC power supply is 550V / cm with intelligent response control, and the oil-water interface is 30%. The salt and water content results of the crude oil after two-stage desalination and dehydration are shown in Table 1 below.

[0035] Table 1 Desalination and dehydration effect of two-stage composite electric field technology

[0036]

Embodiment 2

[0038] The density of a certain crude oil is 966.5kg / m 3 , the acid value is 3.32mgKOH / g, and the salt content is 22.0mg / L. The desalination process conditions are: crude oil temperature 130°C, water injection volume 3.5%, fresh water pH 7, water injection temperature 90°C, water-soluble demulsifier FW 4 The dosage is 50μg / g, the mixing intensity is 45KPa, the field strength of variable frequency power supply is 120V / cm, the frequency of variable frequency power supply is 1500Hz, the field strength of AC and DC power supply is 550V / cm with intelligent response control, and the oil-water interface is 30%. The salt and water content results of the crude oil after two-stage desalination and dehydration are shown in Table 2 below.

[0039] Table 2 Desalination and dehydration effect of two-stage compound electric field technology

[0040]

Embodiment 3

[0042] The density of a certain crude oil is 966.5kg / m3 , the acid value is 3.32mgKOH / g, and the salt content is 22.0mg / L. The desalination process conditions are: crude oil temperature 130°C, water injection volume 3.5%, fresh water injection pH 7, water injection temperature 90°C, no demulsifier, mixing intensity 45KPa, variable frequency power field strength 120V / cm, variable frequency power frequency 1500Hz, Intelligent response control AC and DC power field strength 550V / cm, oil-water interface 30%. The salt and water content results of crude oil after two-stage desalination and dehydration are shown in Table 3 below.

[0043] Table 3 Desalination and dehydration effect of two-stage composite electric field technology

[0044]

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Abstract

The invention discloses a deep electric desalting and dewatering method of heavy high-acid crude oil. The electric desalting and dewatering method comprises the following steps of (1) mixing the heavy high-acid crude oil, subjected to heat exchange, with injected water to obtain a mixed solution; (2) putting the mixed solution into an electric desalting tank for oil-water separation, and enabling the mixed solution to flow through a variable-frequency electric field at the lower part and an alternating and direct current electric field at the upper part of the electric desalting tank in sequence; and (3) repeating the step (2) for oil-water separation again on the mixed solution treated in the step (2) to realize deep electric desalting and dewatering treatment of the heavy high-acid crude oil. The method adopts an intelligent response control variable frequency alternating and direct current composite electric field desalting technology; the electric field layout in the tank body adopts a multi-stage gradient electric field combination, including: a high-frequency weak electric field, a high-frequency strong electric field, an alternating current weak electric field, a direct current electric field, a direct current strong electric field and the like. When the heavy high-acid crude oil is processed on the basis of the process disclosed by the invention, after two stages of electric desalting, the salt content of the desalted crude oil can be less than 2 mg / L, and the water content of the dewatered crude oil can be less than 0.2 percent; and generally, the power consumption can be reduced by 30 percent or above.

Description

technical field [0001] The invention relates to a method for deep electric desalting and dehydration of heavy high-acid crude oil, which belongs to the field of crude oil pretreatment in refining and chemical enterprises. Background technique [0002] With the continuous development and utilization of crude oil, the output of heavy high-acid crude oil is increasing. Among them, the Bohai Sea area is the area with the most potential to increase production of heavy high-acid crude oil in China. In addition, the newly developed Penglai 19-3 heavy crude oil It is also one of the crude oil varieties with the highest acid value in the world, with an acid value as high as 6mgKOH / g or more. According to statistics, the global production of heavy high-acid crude oil has exceeded 400 million tons, accounting for more than 10% of the total crude oil production. [0003] Generally, heavy high-acid crude oil has high density, high viscosity, and high content of colloids and asphaltenes....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G32/02C10G33/02
CPCC10G32/02C10G33/02
Inventor 马方义晋西润薛光亭甘为民王宁潘岩左甜葛玉龙
Owner CHINA NAT OFFSHORE OIL CORP