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Biological polysaccharide gel for oil displacement as well as preparation method and application thereof

A biological polysaccharide and gel technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as time being not effectively controllable, delaying effect cannot be achieved, and green environmental protection is not achieved, and the viscoelasticity can be improved, The effect of improving the implementation effect

Pending Publication Date: 2020-01-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, most of the substances in the delayed gelling agent used in this patent are substances that can help gelation, but in fact, the delayed effect cannot be achieved to a certain extent; on the other hand, the hydrogen bonding force mentioned in the patent promotes The substance mentioned in the agent itself does not delay the gelling effect, and the time is not effectively controllable; moreover, the patent requires the use of high molecular polymers to hydrolyze polyacrylamide, which does not realize the true sense of green environmental protection

Method used

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  • Biological polysaccharide gel for oil displacement as well as preparation method and application thereof
  • Biological polysaccharide gel for oil displacement as well as preparation method and application thereof
  • Biological polysaccharide gel for oil displacement as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Biological polysaccharide gelling agent A 1 and its preparation method

[0048] 1. Biological polysaccharide gelling agent A 1 The composition and components are as follows:

[0049]

[0050] Described biological polysaccharide gelling agent is made of acetic acid, Mg 2+ , Potassium dihydrogen phosphate is composed according to the mass ratio of 15:1:0.5.

[0051] 2. Biological polysaccharide gelling agent A 1 preparation of

[0052] (1) Dissolution and dispersion of biological polysaccharides: put xanthan gum into 50% water, use a magnetic stirrer to stir at room temperature for 5 minutes at a speed of 30 rpm, to obtain a biological polysaccharide solution; add sophorolipids to the biological polysaccharide solution During the process, the rotating speed was increased to 80 rpm, and the stirring was continued for 30 min to obtain a dissolved and dispersed solution of biological polysaccharides.

[0053] (2) Preparation of biological polysaccharid...

Embodiment 2

[0055] Embodiment 2: Biological polysaccharide gelling agent A 2 and its preparation method

[0056] 1. Biological polysaccharide gelling agent A 2 The composition and components are as follows:

[0057]

[0058] Described biological polysaccharide gelling agent is made of lactic acid, Ca 2+ , Disodium hydrogen phosphate is composed according to the mass ratio of 18:2:0.6.

[0059] 2. Biological polysaccharide gelling agent A 2 preparation of

[0060] (1) Dissolution and dispersion of biological polysaccharides: put curdlan gum into 50% water, and stir at room temperature for 8 minutes using a magnetic stirrer at a speed of 40 rpm to obtain a biological polysaccharide solution; add rhamnolipids to biological In the polysaccharide solution, increase the rotation speed to 90 rpm, and continue to stir for 50 minutes to obtain a dissolved and dispersed solution of biological polysaccharides.

[0061] (2) Preparation of biological polysaccharide gelling agent: first put la...

Embodiment 3

[0063] Embodiment 3: biological polysaccharide gelling agent A 3 and its preparation method

[0064] 1. Biological polysaccharide gelling agent A 3 The composition and components are as follows:

[0065]

[0066]

[0067] Described biological polysaccharide gelling agent is made of acetylacetone, A1 3+ , Disodium hydrogen phosphate is composed according to the mass ratio of 20:3:1.

[0068] 2. Biological polysaccharide gelling agent A 3 preparation of

[0069] (1) Dissolution and dispersion of biological polysaccharides: put Wenlun glue into 50% water, use a magnetic stirrer at a speed of 50 rpm, and stir at room temperature for 10 minutes to obtain a biological polysaccharide solution; add lipopeptides to the biological polysaccharide solution , increase the rotational speed to 100 rpm, and continue stirring for 60 min to obtain a dissolved and dispersed solution of biological polysaccharides.

[0070] (2) Preparation of biological polysaccharide gelling agent: fi...

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Abstract

The invention belongs to the technical field of tertiary oil recovery and particularly relates to biological polysaccharide gel for oil displacement as well as a preparation method and application thereof. The biological polysaccharide gel comprises the following components in percentage by weight: 2 to 5 percent of biological polysaccharide, 0.1 to 0.5 percent of biological polysaccharide dispersant, 10 to 20 percent of biological polysaccharide gelatinizing agent, 0.5 to 2 percent of biological polysaccharide regulator and the balance of water, wherein the biological polysaccharide is one ofxanthan gum, Curdlan, Welan gum and sclemglucan; the biological polysaccharide dispersant is one of sophorolipid, rhamnolipid, lipopeptid and lipoprotein; and the biological polysaccharide regulatoris one of ferric sulfate, ammonium carbonate, sodium acetate and sodium hydrogen carbonate. The biological polysaccharide gel has high anti-shearing property, temperature resistance and salt resistance and has good application prospect particularly in an oil well of a high-temperature and high-salt oil reservoir; and in field application, the water content is reduced by over 10 percent, the validity period exceeds 60 days and the average daily-increased oil quantity is more than 5 t.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a biological polysaccharide gel for oil displacement and its preparation method and application. Background technique [0002] Biological polysaccharides are long carbon chain polymer substances produced by certain bacteria, fungi or algae. Many microorganisms can produce a certain amount of different types of biological polysaccharides under different environmental conditions during their growth and metabolism. Biological polysaccharides have attracted much attention because of their safety, non-toxicity and unique physical and chemical properties. According to the existing literature reports, the main uses of biological polysaccharides in the petroleum industry are divided into two categories. One is to provide effective viscosity for solid transmission and solid suspension. It can be used in both low-solid content systems and high-density systems. Wi...

Claims

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Application Information

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IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 曹嫣镔刘涛李彩风冯云胡婧李金志王新耿雪丽林军章刘廷峰
Owner CHINA PETROLEUM & CHEM CORP
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