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Biosynthetic composite oil-displacing agent and application thereof

A technology of biosynthesis and composite flooding, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc. It can solve the problems of large amount of chemical reagents, poor emulsion stability, poor temperature resistance, etc., and achieve expansion The effects of water flooding on the swept volume, small adsorption capacity, and wide range of temperature adaptation

Active Publication Date: 2020-06-26
陕西中诺油气科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical reagents used in chemical flooding generally have problems such as large dosage, poor temperature resistance, poor emulsion stability, and low oil displacement efficiency, and there are also problems such as not easy to degrade, toxic, and pollute the environment.
The current mature method of enhancing oil recovery is mainly chemical polymer surface binary flooding, in which petroleum sulfonates are mostly used as surfactants, and polyacrylamide polymers are mostly used in high-permeability reservoirs. Chemical polymer surface binary flooding The lower limit of permeability given by the flooding industry is 20 mD, so this method is not suitable for low-permeability reservoirs and ultra-low-permeability reservoirs

Method used

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  • Biosynthetic composite oil-displacing agent and application thereof
  • Biosynthetic composite oil-displacing agent and application thereof
  • Biosynthetic composite oil-displacing agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A kind of biosynthetic compound oil displacement agent, this oil displacement agent is made of the raw material of following percentage by weight:

[0062] Sophorolipid fermentation broth (sophorolipid content 26%) 45%;

[0063] Rhamnolipid fermentation broth (3.5% rhamnolipid content) 15%;

[0064] Sclerotin (molecular weight Mn is about 1 million Da, purity ≥ 85% (wt)) 1%;

[0065] Micron sugar beet molasses 4%;

[0066] Sodium benzoate 2‰;

[0067] The remainder is water.

[0068] The preparation method of described biosynthetic composite oil displacement agent, this method comprises:

[0069] At room temperature, mix Sclerotin with part of the water, stir evenly, and fully swell to obtain a mixed solution 1;

[0070] At room temperature, mix sophorolipids, rhamnolipids, micron-sized sugar beet molasses (with a particle size of 0.1 to 50 μm), sodium benzoate and remaining water, and stir evenly to obtain a mixed solution 2;

[0071] Mix the mixed solution 1 and...

Embodiment 2

[0073] A kind of biosynthetic compound oil displacement agent, this oil displacement agent is made of the raw material of following percentage by weight:

[0074] Sophorolipid fermentation liquid (sophorolipid content 26%) 50%;

[0075] Rhamnolipid fermentation broth (3.5% rhamnolipid content) 20%;

[0076] Sclerotin (molecular weight is about 1 million, purity ≥ 85% (wt)) 0.8%;

[0077] Micron sugar beet molasses (particle size 0.1-50 μm) 2%;

[0078] Sodium benzoate 2‰;

[0079] The remainder is water.

[0080] The preparation method is the same as in Example 1.

Embodiment 3

[0082] A kind of biosynthetic compound oil displacement agent, this oil displacement agent is made of the raw material of following percentage by weight:

[0083] Sophorolipid fermentation liquid (sophorolipid content 26%) 40%;

[0084] Rhamnolipid fermentation broth (3.5% rhamnolipid content) 10%;

[0085] Sclerotin (molecular weight is about 1 million, purity ≥ 85% (wt)) 1.2%;

[0086] Micron sugar beet molasses (particle size: 0.1-50 μm) 5%;

[0087] Potassium sorbate 2‰;

[0088] The remainder is water.

[0089] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a biosynthetic composite oil-displacing agent and application thereof. The oil-displacing agent is prepared from the following raw materials in percentage by weight: 40-50% ofsophorolipid fermentation liquor; 10 to 20 percent of rhamnolipid fermentation liquid; 0.5 to 2 percent of sclerotium rolfsii polysaccharide; 1-10% of micron-sized beet waste molasses; 0.05-0.2% of astabilizing agent; remaining water. The oil-displacing agent provided by the invention can enable an oil film adhered to the surface of a rock to be quickly stripped and residual oil retained by water power to fall off, dispersed oil drops are promoted to converge, start to flow and migrate, emulsified emulsion and polysaccharide components can play a role in profile control and displacement, thewater-displacing swept volume is enlarged, the oil-displacing efficiency and the oil-washing efficiency are improved, and the final recovery ratio is increased.

Description

technical field [0001] The invention relates to a biosynthetic composite oil displacement agent and its application, belonging to the technical field of oil field tertiary oil recovery. Background technique [0002] The information disclosed in this background section is only intended to increase some understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Up to now, the national petroleum geological reserves are medium and low permeability reservoirs (<50×10 -3 μm 2 ) reserves account for about 11%; among the proven undeveloped petroleum geological reserves, low-permeability reservoirs account for more than 50%; and among the proven petroleum geological reserves in recent years, low-permeability reservoirs account for more than 60% . In addition, most oilfields in my country ha...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588E21B43/22
CPCC09K8/584C09K8/588E21B43/16
Inventor 魏战胜李永明王军锋胡卫东冯松林何令普范春林乔守武
Owner 陕西中诺油气科技有限公司
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