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Dinuclear cobalt compound and application thereof in underground catalytic reforming viscosity reduction of heavy oil

A technology of cobalt compound and viscosity reduction, which is applied in the field of binuclear cobalt compound and its application in heavy oil underground catalytic upgrading and viscosity reduction, which can solve the problems of poor catalytic effect, limited contact with crude oil, and high price

Active Publication Date: 2016-10-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Homogeneous catalysts are divided into water-soluble catalysts and oil-soluble catalysts. Water-soluble catalysts, such as inorganic metal salts, are cheap and easy to obtain, but have limited contact with crude oil, and the catalytic effect is relatively poor; oil-soluble catalysts, such as organometallic salts, Catalytic effect is good, but the price is more expensive

Method used

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  • Dinuclear cobalt compound and application thereof in underground catalytic reforming viscosity reduction of heavy oil
  • Dinuclear cobalt compound and application thereof in underground catalytic reforming viscosity reduction of heavy oil
  • Dinuclear cobalt compound and application thereof in underground catalytic reforming viscosity reduction of heavy oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a kind of binuclear cobalt compound, and the preparation step of this compound comprises:

[0037] Add n-butyllithium (178 ml of 2.8 mol / L n-hexane solution) to a solution of Cp*H (68 g) in tetrahydrofuran (1000 ml) at -78°C, and raise the temperature to 20°C within 2 hours after the addition is complete. and maintained at 20°C for 2 hours to obtain a reaction solution A containing Cp*Li;

[0038] Cool the reaction solution A to -78°C, then add anhydrous cobalt chloride (64 g), gradually raise the temperature to 0°C after the addition, and keep the temperature at 0°C for 2 hours to obtain the reaction solution B;

[0039]Cool the reaction solution B to -78°C, then add 1,3-propanedithiol dilithium salt (27 g), maintain the reaction at -78°C for 1 hour after the addition, and then rise to room temperature to obtain the reaction solution C;

[0040] The reaction solution C is subjected to vacuum distillation to remove the solvent, and then n-hexan...

Embodiment 2

[0045] This example provides an application of the binuclear cobalt compound prepared in Example 1 in the underground catalytic upgrading and viscosity reduction of heavy oil, which specifically includes the following steps:

[0046] (1) Mix 50 grams of Z32 heavy oil with 0.5 grams of binuclear cobalt compound Placed in a 250ml reactor;

[0047] (2) Replace the reactor with nitrogen for 3 times, then heat up to 100°C, and stir at this temperature for 15 minutes;

[0048] (3) Linearly increase the temperature to 300° C. within half an hour, and stop the reaction after the reforming reaction at this temperature for 8 hours.

[0049] Test steps:

[0050] Cool the thick oil after the reaction to room temperature, take out the modified sample, and test the viscosity of the sample at 50°C with a Haake rheometer.

[0051] Test results: Viscosity of heavy oil decreased from 35805mP·s before modification to 5335mP·s, and viscosity reduction rate was 85.1%. It can be seen that the ...

Embodiment 3

[0061] This example provides an application of the binuclear cobalt compound prepared in Example 1 in the underground catalytic upgrading and viscosity reduction of heavy oil, which specifically includes the following steps:

[0062] (1) Mix 50 grams of Z32 heavy oil with 0.5 grams of binuclear cobalt compound Placed in a 250ml reactor;

[0063] (2) Replace the reactor with nitrogen for 3 times, then heat up to 100°C, and stir at this temperature for 15 minutes;

[0064] (3) Linearly increase the temperature to 250° C. within half an hour, and stop the reaction after the reforming reaction at this temperature for 8 hours.

[0065] Test steps:

[0066] Cool the thick oil after the reaction to room temperature, take out the modified sample, and test the viscosity of the sample at 50°C with a Haake rheometer.

[0067] Test results: Viscosity of heavy oil decreased from 35805mP·s before modification to 15970mP·s, and viscosity reduction rate was 55.4%. It can be seen that the...

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Abstract

The invention provides a dinuclear cobalt compound and application thereof in underground catalytic reforming viscosity reduction of heavy oil. Specifically, the dinuclear cobalt compound is prepared by the method of: firstly reacting Cp*Li with anhydrous cobalt chloride, then reacting the product with 1, 3 propanedithiol dilithium salt, and then conducting aftertreatment to obtain the dinuclear cobalt compound. The invention also provides application of the dinuclear cobalt compound as a catalyst in underground catalytic reforming viscosity reduction of heavy oil, wherein the catalytic reforming viscosity reduction utilizes catalytic cracking reaction or hydrogen donor catalytic cracking reaction. Testing proves that the dinuclear cobalt compound provided by the invention has a good effect in underground catalytic reforming viscosity reduction of heavy oil.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a binuclear cobalt compound and its application in underground catalytic upgrading and viscosity reduction of heavy oil. Background technique [0002] The world's heavy oil resources are huge, estimated to be several times higher than conventional crude oil resources, and are one of the most realistic alternative energy sources. Heavy oil resources are widely distributed and found in almost all oil-producing countries. According to survey statistics, countries rich in heavy oil (including extra-heavy oil) resources in the world include the United States, Venezuela, Canada, and the former Soviet Union. Sand resource about (4000-6000)×108m 3 (including estimated resources). my country is extremely rich in heavy oil resources, and more than 70 heavy oil fields have been discovered in 12 large and medium-sized oil-bearing basins and depressions, including th...

Claims

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Application Information

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IPC IPC(8): C07F17/02C09K8/592
CPCC07F17/02C09K8/592
Inventor 李阳黄佳江航陈希马德胜吴康云张善严孙盈盈周明辉
Owner PETROCHINA CO LTD
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