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Polymer micro-emulsion adopting gemini sulfonate type composite emulsifier, profile control and flooding system, and preparation method and application of polymer micro-emulsion

A technology of polymers and microemulsions, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of reduced oil displacement effect, poor oil-water interface activity, aquatic toxicity, skin irritation, poor teratogenicity and biodegradation sexual issues

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lipophilicity of Span will make the activity of the oil-water interface worse. After the microspheres are formulated into an aqueous solution and injected into the ground, the oil displacement effect will be greatly reduced; Poor biodegradability, its use has been restricted in most countries and regions in recent years

Method used

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  • Polymer micro-emulsion adopting gemini sulfonate type composite emulsifier, profile control and flooding system, and preparation method and application of polymer micro-emulsion
  • Polymer micro-emulsion adopting gemini sulfonate type composite emulsifier, profile control and flooding system, and preparation method and application of polymer micro-emulsion
  • Polymer micro-emulsion adopting gemini sulfonate type composite emulsifier, profile control and flooding system, and preparation method and application of polymer micro-emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of N, N-dilauroyl ethylenediamine diacetic acid dipolyoxyethylene ether (m+n=6) disulfonate surfactant:

[0057] (a) Synthesis of two lauryl (lauroyl) ethylenediamine

[0058] Add 300g (1.5mol) of lauric acid, 267.8g (2.25mol) of thionyl chloride and 4.5g of DMF (0.06mol) into a 2000mL four-necked flask equipped with a sealed mechanical stirrer, a thermometer, a condenser, etc., and react at 80°C After 3 hours, excess thionyl chloride was distilled off under reduced pressure to obtain lauroyl chloride. When the temperature drops to 60°C, add 150g of dry toluene, stir evenly, slowly add dropwise the composition consisting of 30.0g (0.5mol) of anhydrous ethylenediamine, 99.0g (1.25mol) of anhydrous pyridine and 150g of dry toluene The mixed solution, the temperature is controlled to be less than 60°C, and the temperature is raised to 85°C for 2 hours after the dropwise completion. After cooling and filtering, the crude product was recrystallized from ethanol...

Embodiment 2

[0075] The preparation of N,N-dilauroyl ethylenediamine diacetic acid dipolyoxyethylene ether (m+n=6) sodium disulfonate surfactant and the preparation process of the polymer microemulsion control and flooding system are the same as [implementation Example 1], but the amount of emulsifier N, N-dilauroyl ethylenediamine diacetic acid dipolyoxyethylene ether (m+n=6) sodium bissulfonate and Tween80 were changed to 8g and 10g respectively. The polymer microemulsion control and flooding system and the characterization method of the polymer microspheres in it are the same as [Example 1], and the results are shown in Table 1.

Embodiment 3

[0077] The preparation of N,N-dilauroyl ethylenediamine diacetic acid dipolyoxyethylene ether (m+n=6) sodium disulfonate surfactant and the preparation process of the polymer microemulsion control and flooding system are the same as [implementation Example 1], but the amount of emulsifier N,N-dilauroyl ethylenediamine diacetic acid dipolyoxyethylene ether (m+n=6) sodium bissulfonate and Tween80 were changed to 10g and 8g respectively. The polymer microemulsion control and flooding system and the characterization method of the polymer microspheres in it are the same as [Example 1], and the results are shown in Table 1.

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Abstract

The invention relates to a polymer micro-emulsion adopting a gemini sulfonate type composite emulsifier, a profile control and flooding system, and a preparation method and application of the polymermicro-emulsion, and mainly solves the problems of large dosage and no oil washing effect of a conventional emulsifier for inverse micro-emulsion polymerization in the prior art. According to the technical scheme, the polymer micro-emulsion comprises an oil-soluble solvent, water, an emulsifier and polymer microspheres, wherein the oil-soluble solvent is a continuous phase, the water is a dispersedphase, and the emulsifier comprises a gemini sulfonate type surfactant represented by a formula (1), wherein in the formula, R1 is a C9-C17 alkyl group, R2 is a C2-C6 alkylene group, m and n are adduct numbers of ethoxyl groups EO, m+n is any number from 2 to 12; and M is any ion of K, Na and Li. The problems are well solved, and the system can be used as an oil displacement agent and a deep water plugging and profile control agent and applied to tertiary oil recovery of an oil field to increase the crude oil recovery ratio.

Description

technical field [0001] The invention relates to a polymer microemulsion using a gemini sulfonate type composite emulsifier, a control and flooding system, a preparation method and an application thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. However, for heterogeneous formations, the displacement can only act on the high-permeability layer, not the oil-bearing low-permeability layer, which reduces the recovery rate of crude oil and increases the cost. Generally, injection well profile control and production well water plugging te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/54C08F222/38C08F2/26C08F2/30C09K8/584C09K8/60C09K8/88
CPCC08F2/26C08F2/30C08F220/56C09K8/584C09K8/604C09K8/887
Inventor 宋晓芳夏燕敏沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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