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A Viscosity Reducing Underground Oil Recovery Method for Viscous Oil

A technology for upgrading and reducing viscosity and heavy oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of limited recovery effect of extra-ultra-heavy oil, achieve wide application prospects and promotion value, and integrate Convenience in transportation and the effect of improving the quality of heavy oil

Active Publication Date: 2018-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steam huff and puff and steam flooding are currently the most commonly used production methods in the world. Although this method has a good recovery effect on ordinary heavy oil, it has very limited recovery effect on ultra-heavy oil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Catalyst and auxiliary agent: the amphiphilic catalyst is prepared by the reaction of nickel salt and aromatic ring acid, wherein the nickel salt is nickel nitrate, and the aromatic ring acid is sulfonic acid; the auxiliary agent is hydrogen donor toluene; and the mass ratio of the catalyst to the auxiliary agent is 1:0.03.

[0020] Small-scale experiment: the total amount of catalyst and additives is 0.2wt% of heavy oil, the mass ratio of oil to water is 7:3, 0.2g of catalyst and additives are dissolved in 43g of water, and 100g of heavy oil (degassed at 50°C with a viscosity of 179.8Pa.S) into a 500ml reactor, and high-purity nitrogen was introduced to remove the air, and the catalytic cracking reaction was carried out at 200°C for 24 hours. After the reaction, the viscosity of the heavy oil was 48.36Pa.S, and the viscosity reduction rate reached 73.1%.

Embodiment 2

[0022] Catalyst and auxiliary agent: the amphiphilic catalyst is prepared by the reaction of nickel salt and aromatic ring acid, wherein the nickel salt is nickel chloride, and the aromatic ring acid is benzoic acid; the auxiliary agent is dispersant ethanol; and the mass ratio of the catalyst to the auxiliary agent is 1:0.1.

[0023] Small-scale experiment: the total amount of catalyst and additives is 0.5wt% of the heavy oil, and the mass ratio of oil to water is 7:3. Dissolve 0.5g of catalyst and additives in 43g of water and mix with 100g of heavy oil (the degassed viscosity at 50°C is 179.8Pa.S) were added into a 500ml reactor, and high-purity nitrogen was introduced to remove the air, and the catalytic cracking reaction was carried out at 180°C for 36 hours. After the reaction, the viscosity of the heavy oil was 35.74Pa.S, and the viscosity reduction rate reached 80.12%.

Embodiment 3

[0025] Catalyst and auxiliary agent: the amphiphilic catalyst is prepared by the reaction of nickel salt and aromatic ring acid, wherein the nickel salt is nickel nitrate, and the aromatic ring acid is toluene-4-sulfonic acid; the auxiliary agent is hydrogen donor toluene and dispersant dodecane Base benzene sulfonic acid; and the mass ratio of catalyst to total additives is 1:0.3.

[0026] Small-scale experiment: the total amount of catalyst and additives is 0.5wt% of the heavy oil, and the oil-water mass ratio is 6:4. Dissolve 0.5g of catalyst and additives in 66.7g of water, and 100g of heavy oil (50°C degassed viscosity is 179.8Pa.S) into a 500ml reactor, and high-purity nitrogen is introduced to remove the air, and the catalytic cracking reaction is carried out at 200°C for 24 hours. After the reaction, the viscosity of the heavy oil is 19.96Pa.S, and the viscosity reduction rate reaches 88.9%. .

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Abstract

The invention provides an underground upgrading viscosity-reducing oil production method for thick oil. The underground upgrading viscosity-reducing oil production method for the thick oil comprises the steps that in the process of steam injection production of the thick oil, amphiphilic catalysts and additives are injected into a stratum along with steam, an oil layer is heated to enable the temperature to range from 160 DEG C to 240 DEG C, and soaking operation is conducted for 1-5 days, so that an aquathermolysis reaction between asphaltene and colloid in heavy components of the thick oil is facilitated, wherein the total mass of the amphiphilic catalysts and the additives is 0.15-2.0wt% the mass of the thick oil, the amphiphilic catalysts are prepared through a reaction between nickel salt and aromatic ring acid, and the additives are hydrogen donors and / or dispersing agents. According to the invention, the amphiphilic catalysts are hydrophilic and oleophilic, dissolve and disperse in the steam, and then disperse in the thick oil of the stratum along with the steam. Under the existing steam injection condition, the amphiphilic catalysts are added to the steam, and site operation can be conducted. The underground upgrading viscosity-reducing oil production method for the thick oil is easy to operate, and safe and reliable, and has the broad application prospect and the high promotion value, the production cycle is remarkably prolonged, and the good effect of enhanced production of the oil can be achieved.

Description

technical field [0001] The invention relates to an underground upgrading and viscosity-reducing oil recovery method for heavy oil. Background technique [0002] According to estimates by relevant experts, heavy oil is several times to more than ten times higher than conventional crude oil resources, and has a strategic position to replace conventional oil energy. Heavy oil resources are widely distributed and found in almost all oil-producing countries. According to survey data, 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)×10 8 m 3 (including forecast resources). [0003] At present, several heavy oil recovery methods have been developed at home and abroad, and the technologies that have been put into commercial application: steam huff and puff, steam flooding. Process technologies being developed and applied: underground modificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/24
CPCE21B43/162E21B43/24
Inventor 吴川张祖国苏建政张汝生李建平杨立红
Owner CHINA PETROLEUM & CHEM CORP
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