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Low-tension polymer micro-emulsion, profile control and flooding system, and preparation method and application thereof

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

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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  • Low-tension polymer micro-emulsion, profile control and flooding system, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation of fatty alcohol polyoxyethylene (5) sodium ether sulfonate surfactant:

[0050] (a) synthetic reaction of alcohol ether sodium

[0051] Put 100g of fatty alcohol polyoxyethylene (5) ether (AEO-5) and 10g of sodium hydroxide into a 500mL four-necked flask connected with a water separator and a condenser, then add 120mL of cyclohexane to it, stir and heat in an oil bath At 90°C, the water formed by the reaction was removed by azeotropic distillation. After the reaction was completed, the remaining cyclohexane in the reaction flask was removed.

[0052] (b) Sulfonation reaction

[0053] Sodium alcohol ether is transferred in constant pressure titration funnel, and drop into 120mL toluene and 55g2-sodium chloroethyl sulfonate (the mol ratio 1.2 of 2-sodium chloroethyl sulfonate and sodium alcohol ether) in reaction bottle, be warming up to At 65°C, sodium alcohol ether was added dropwise, and the crude product was obtained after 5 hours of reaction. The ...

Embodiment 2

[0062] The preparation of fatty alcohol polyoxyethylene (5) ether sodium sulfonate surfactant and the preparation process of the low-tension polymer microemulsion adjusting and flooding system are all the same as [Example 1], except that the emulsifier fatty alcohol polyoxyethylene (5 ) Sodium ether sulfonate 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

[0064] The preparation of fatty alcohol polyoxyethylene (5) ether sodium sulfonate surfactant and the preparation process of the low-tension polymer microemulsion adjusting and flooding system are all the same as [Example 1], except that the emulsifier fatty alcohol polyoxyethylene (5 ) Sodium ether sulfonate 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 low-tension polymer micro-emulsion, a profile control and flooding system as well as a preparation method and application thereof and mainly solves the problems of large using amount and no oil washing effect of a conventional emulsifier for inverse micro-emulsion polymerization in the prior art. 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 dispersed phase; the emulsifier comprises a fatty alcohol-polyoxyethylene ether sulfonate surfactant with a structure shown in a formula (1), wherein in the formula, R is C10-C25 aliphatic hydrocarbon, n is equal to 1-24, and M is selected from H, alkali metal or NH4. The problems are well solved, and the system can be used as an oil displacement agent and a deep water shutoff profile control agent and applied to tertiary oil recovery of an oil field to increase the crude oil recovery ratio.RO(CH2CH2O)nCH2CH2SO3M... (1).

Description

technical field [0001] The invention relates to a low-tension polymer microemulsion, a control and flooding system, a preparation method and 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 technology are often used for heterogeneous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/584C08F220/56C08F220/58C08F220/54C08F2/26C08G65/334
CPCC09K8/512C09K8/5086C09K8/5083C09K8/584C08F220/56C08F2/26C08G65/3346
Inventor 宋晓芳夏燕敏苏智青
Owner CHINA PETROLEUM & CHEM CORP
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