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Treatment method for extracting heavy oil by using supercritical water and solvent

A technology of supercritical water and treatment method, which is applied in the treatment of hydrocarbon oil, solvent refining through deasphalting, petroleum industry, etc., can solve the problems of supercritical water treatment and separation capacity bottleneck, etc. reduced effect

Active Publication Date: 2021-12-17
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention directly treats heavy oil or asphalt components with supercritical water, and realizes product separation through a vacuum separation process. There is a certain bottleneck in supercritical water treatment and separation capabilities.

Method used

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  • Treatment method for extracting heavy oil by using supercritical water and solvent
  • Treatment method for extracting heavy oil by using supercritical water and solvent
  • Treatment method for extracting heavy oil by using supercritical water and solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] a) After the heavy oil raw material is heated to 90°C, the heavy oil raw material, water, solvent and light distillate oil are transported to the mixer for mixing to obtain the mixed raw material. The mass ratio of water to heavy oil raw material is 0.2:1, and the mass ratio of solvent to heavy oil raw material is 0.1 :1, the mass ratio of light distillate oil and heavy oil raw material is 0.01:1, and the properties of heavy oil are shown in Table 1.

[0049] b) The mixed raw material obtained in step a) is pressurized to 22.1MPa, heated to 374° C., then, the mixed raw material enters through the lower inlet of the supercritical water reactor, and the residence time of the mixed raw material in the supercritical water reactor is 40 minutes. pyrolysis reaction occurs;

[0050] c) The temperature of the reaction product described in step b) is lowered to 237° C., and the pressure is reduced to 3 MPa, and then transported to a hot high-pressure separator for separation to ...

Embodiment 2

[0058] a) After the heavy oil raw material is heated to 60°C, the heavy oil raw material, water, solvent and light distillate oil are transported to the mixer for mixing to obtain the mixed raw material. The mass ratio of water to heavy oil raw material is 5:1, and the mass ratio of solvent to heavy oil raw material is 5 :1, the mass ratio of light distillates and heavy oil feedstock is 0.25:1, and the properties of heavy oil are shown in Table 1.

[0059] b) The mixed raw material obtained in step a) is boosted to 35MPa, heated to 500° C., then, the mixed raw material enters through the lower inlet of the supercritical water reactor, and the residence time of the mixed raw material in the supercritical water reactor is 30 seconds. pyrolysis reaction occurs;

[0060] c) The temperature of the reaction product described in step b) is lowered to 266° C., and the pressure is lowered to 5 MPa, and then transported to a hot high-pressure separator for separation to obtain a gas pha...

Embodiment 3

[0068] a) The heavy oil raw material is oil sand asphalt heated to 90°C and water heated to 90°C, then the heavy oil raw material, water, solvent and light distillate oil are transported to the mixer for mixing to obtain the mixed raw material, and the mass ratio of water to heavy oil raw material is 1: 1. The mass ratio of solvent to heavy oil raw material is 0.4:1, and the mass ratio of light distillate oil to heavy oil raw material is 0.25:1. The properties of heavy oil are shown in Table 1.

[0069] b) The mixed raw material obtained in step a) is boosted to 25MPa, heated to 420° C., then, the mixed raw material enters through the lower inlet of the supercritical water reactor, and the residence time of the mixed raw material in the supercritical water reactor is 10 minutes. pyrolysis reaction occurs;

[0070]c) The temperature of the reaction product described in step b) is lowered to 260° C., and the pressure is lowered to 4 MPa. Then, it is sent to a hot high-pressure s...

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Abstract

The invention discloses a treatment method for extracting heavy oil by using supercritical water and a solvent, which comprises the steps of respectively heating and pressurizing heavy oil, water, the solvent and light distillate oil, then mixing the raw materials, transferring the mixture to a supercritical water reactor, carrying out cracking reaction on the heavy oil, cooling and depressurizing the reaction product, carrying out separation treatment, and achieving separation and solvent recovery of cracked gas, light distillate oil, medium distillate oil and deoiled asphalt products. The treatment method can effectively realize lightweight modification and separation of the heavy oil, the light distillate oil and the solvent play a role of a hydrogen donor in the modification process, the viscosity is remarkably reduced, and the yield of the light oil is improved. The method is wide in application range and can also be used for treating substances such as petroleum, thickened oil, super-thickened oil and oil sand.

Description

technical field [0001] The invention relates to the technical field of oil treatment, in particular to a treatment method for extracting heavy oil with supercritical water and a solvent. Background technique [0002] Heavy oil is difficult to transport due to its high viscosity, and has impurities such as sulfur, nitrogen, metal elements, and residual carbon, so it needs to be pretreated to upgrade heavy oil. [0003] Hydrotreating and solvent deasphalting are important methods of heavy oil pretreatment. The liquid phase oil obtained by hydroprocessing has a high yield and high quality, but because hydrogen is difficult to dissolve in the oil, the gas-liquid phase mass transfer resistance is relatively large, which makes the hydroprocessing process efficiency low. Solvent deasphalting is the separation of deasphalted oil and asphaltene components by using the difference in the solubility of light hydrocarbon solvents for oil and asphaltene in heavy oil. [0004] CN10979047...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/00C10G9/00C10G21/00C10G21/14C10G21/28
CPCC10G21/28C10G21/14C10G21/003C10G9/00C10G55/00C10G2300/1037C10G2300/202C10G2300/206Y02P20/54
Inventor 辛利于海斌刘冠锋李福双郭春垒刘凯隆薛同晖臧甲忠袁慎忠李佳于瑞香
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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