Wetting reversal agent for pressure reduction and augmented injection of ultra-low permeability reservoir and preparation method thereof

A wetting reversal and oil penetration technology, which is applied in ether preparation, reductive alkylation preparation, chemical instruments and methods, etc., can solve the problems of short validity period, small action distance, poor effect, etc., to improve oil displacement efficiency, The effect of improving flow ability

Inactive Publication Date: 2020-06-05
XIAN AODE PETROCHEM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acidizing acid fracturing is to improve formation seepage conditions by removing pollutants on the borehole wall, acid-eroding minerals in rocks, and corroding cracks, so as to increase production and injection. small, short-lived

Method used

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  • Wetting reversal agent for pressure reduction and augmented injection of ultra-low permeability reservoir and preparation method thereof
  • Wetting reversal agent for pressure reduction and augmented injection of ultra-low permeability reservoir and preparation method thereof
  • Wetting reversal agent for pressure reduction and augmented injection of ultra-low permeability reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Cationic gemini type surfactant shown in embodiment 1 formula I

[0048] The preparation method is as follows:

[0049]

[0050] S1. Dissolve 1 mol of p-hydroxybenzaldehyde in 100 mL of dichloromethane, add 1 mol of thionyl chloride and 2 mol of triethylamine in sequence, react at room temperature for 2 hours, add 1 mol of alkyl alcohol (n=12), stir and react at room temperature for 2 hours, and obtain Intermediate I (A);

[0051]

[0052] S2. Dissolve intermediate I (A) in 100 mL of acetonitrile, add 2 mol of triethylamine and 1 mol of p-toluenesulfonyl chloride, heat to 60°C, and react for 2 hours to obtain intermediate II (B);

[0053] S3. Dissolve the intermediate II (B) in 100 mL of acetone, add 2 mol of triethylamine and 1 mol of potassium bromide, and react at room temperature for 1 hour to obtain the intermediate III (C);

[0054]

[0055] S4. Mix 1mol N,N'-dimethylethylenediamine and 100mL 85wt% formic acid, heat up to 80°C, add 100mL 35wt% formaldehyd...

Embodiment 2

[0059] Embodiment 2 cationic gemini type surfactant shown in formula I

[0060] The preparation method is as follows:

[0061] S1. Dissolve 1.2 mol of p-hydroxybenzaldehyde in 100 mL of dichloromethane, add 1 mol of thionyl chloride and 2 mol of triethylamine in sequence, react at room temperature for 3 hours, add 1 mol of alkyl alcohol (n=10), and stir at room temperature for 2 hours. Intermediate I (A) is obtained;

[0062] S2. Dissolve intermediate I (A) in 100 mL of acetonitrile, add 2 mol of triethylamine and 1.2 mol of p-toluenesulfonyl chloride, heat to 80°C, and react for 4 hours to obtain intermediate II (B);

[0063] S3. Dissolving intermediate II (B) in 100 mL of acetone, adding 2 mol of triethylamine and 1.2 mol of potassium bromide, and reacting at room temperature for 2 hours to obtain intermediate III (C);

[0064] S4. Mix 1.2mol N,N'-dimethylethylenediamine and 100mL 85wt% formic acid, heat up to 85°C, add 100mL 40wt% formaldehyde solution, heat up to 120°C, ...

Embodiment 3

[0066] Example 3 Cationic Gemini Surfactants Shown in Formula I

[0067] The preparation method is as follows:

[0068] S1. Dissolve 1.1 mol of p-hydroxybenzaldehyde in 100 mL of dichloromethane, add 1 mol of thionyl chloride and 2 mol of triethylamine in sequence, react at room temperature for 2.5 hours, then add 1 mol of alkyl alcohol (n=18), and stir for 2 hours at room temperature , to obtain intermediate I (A);

[0069] S2. Dissolve intermediate I (A) in 100 mL of acetonitrile, add 2 mol of triethylamine and 1.1 mol of p-toluenesulfonyl chloride, heat to 70°C, and react for 3 hours to obtain intermediate II (B);

[0070] S3. Dissolving the intermediate II (B) in 100 mL of acetone, adding 2 mol of triethylamine and 1.1 mol of potassium bromide, and reacting at room temperature for 1.5 h to obtain the intermediate III (C);

[0071] S4. Mix 1.1mol N,N'-dimethylethylenediamine and 100mL 85wt% formic acid, heat up to 82°C, add 100mL 35-40wt% formaldehyde solution, heat up to...

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Abstract

The invention provides a wetting reversal agent for pressure reduction and augmented injection of an ultra-low permeability reservoir. The wetting reversal agent is prepared from the following raw materials: a cationic gemini surfactant, a nonionic surfactant, an efficient anti-swelling swelling shrinkage agent, ethanol, ethylene glycol monoethyl ether and deionized water. The cationic gemini surfactant has a structure as shown in a formula I which is described in the specification, wherein n is equal to 3-18. The invention provides the wetting reversal agent for pressure reduction and augmented injection of an oil field and a preparation method of the wetting reversal agent. The effects of pressure reduction, augmented injection and yield increase of the sensitive ultra-low-permeability hydrophilic water-injection high-pressure oil reservoir are improved.

Description

technical field [0001] The invention relates to a wetting reversal agent for reducing water injection pressure and increasing water injection volume of water injection wells in an oil field for ultra-low permeability sandstone reservoirs, and belongs to the technical field of increasing production and injection of oil and water wells in oil fields. Background technique [0002] Ultra-low permeability reservoirs generally have poor physical properties, such as low permeability, small pore throats and complex structures, and poor connectivity between pore throats and pores. The complex and variable pore-throat structure makes the flow of multiphase fluid in this fine and unevenly distributed pore-throat structure subject to various resistances, which may lead to excessively high injection pressure during water injection development. [0003] Clay minerals such as illite, kaolinite, and illite mixed layers are relatively high in sensitive reservoirs. Kaolinite is easy to break...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/58C07C213/02C07C215/72
CPCC07C41/01C07C41/22C07C209/24C07C213/02C07C215/72C09K8/58C09K8/584C09K2208/12C07C43/1783C07C43/1742C07C211/09
Inventor 张瀚澜曹建坤李健
Owner XIAN AODE PETROCHEM ENG TECH CO LTD
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