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A kind of viscosity modifier for oil displacement and preparation method thereof

A viscosity modifier and oil displacement technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of chemical agents not working, prone to chromatographic separation, and huge difference in molecular weight, etc., to achieve thickening of the water phase Significantly, the viscosity of the oil phase is significantly reduced, and the effect of reducing the viscosity of the oil phase

Active Publication Date: 2022-05-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical agents used in surfactant flooding and polymer flooding are different, and their molecular weights differ greatly. Chromatographic separation is easy to occur in the formation, and the chemical agents cannot play a role. Therefore, the chemical agents used in surfactant flooding and polymer flooding cannot be simplified. For mixing and joint use, it is necessary to develop a chemical agent that can simultaneously reduce the viscosity of crude oil with surface activity and increase the viscosity of the water phase to improve the oil-water mobility ratio

Method used

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  • A kind of viscosity modifier for oil displacement and preparation method thereof
  • A kind of viscosity modifier for oil displacement and preparation method thereof
  • A kind of viscosity modifier for oil displacement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 4g of polyvinyl alcohol was dissolved in water, 8g acrylamide, 2g N-isopropyl acrylamide, 1.6g phenoxyacetate were added sequentially, 0.075g of potassium persulfate was dissolved in water, stirred until completely dissolved and then added to the polyvinyl alcohol solution, continuously stirred and introduced nitrogen during the addition process; the oil bath was heated to 40 °C, and 0.2g of hydroquinone was added after the reaction was 4h, and the ethanol precipitation, filtration and drying could obtain graft copolymerization products.

[0025] The prepared viscosity regulator was configured with deionized water into an aqueous solution with a mass concentration of 1%, and its viscosity at 80 °C was tested by a rotary viscometer, and the results were shown in Table 1;

[0026] The viscosity of crude oil at 80 °C was tested by rotary viscometer, and the results were shown in Table 1;

[0027] The prepared viscosity regulator was configured with deionized water into an aque...

Embodiment 2

[0034] The preparation method and test method of the viscosity regulator described in Example 1, the difference is that: the dosage of acrylamide is 7g, and the amount of allyl phenoxyacetate is 1.8g. The test results are shown in Table 1.

Embodiment 3

[0036] The preparation method and test method of the viscosity regulator described in Example 1, the difference is that: the amount of acrylamide is 6g, and the amount of allyl phenoxyacetate is 2.0g. The test results are shown in Table 1.

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Abstract

A viscosity regulator for oil displacement and a preparation method thereof, in particular to a viscosity regulator capable of simultaneously increasing the viscosity of the water phase and reducing the viscosity of the oil phase and a preparation method thereof. The viscosity regulator consists of polyvinyl alcohol, acrylamide, N-isopropylacrylamide, allyl phenoxyacetate in mass ratio (25-50):(50-100):(10-30):(20- 30) Prepared by graft copolymerization, the suitable application mass concentration is 0.2%-2%. After the viscosity modifier is dissolved in water, it can increase the viscosity of the water phase and significantly reduce the viscosity of crude oil by emulsifying heavy oil.

Description

Technical field [0001] The present invention relates to a viscosity regulator, in particular to a viscosity regulator that can increase the viscosity of the aqueous phase, and at the same time reduce the viscosity of the heavy oil by emulsification, to achieve a high yield of heavy oil. Background [0002] The exploitation of oil is divided into three stages, which are primary oil production, secondary oil production and tertiary oil production. A single oil production uses the energy of the oil well itself for oil extraction, and the recovery rate is generally not higher than 20%. Secondary oil recovery uses manual energy input to replenish well energy, and oil extraction can increase the recovery rate to 30%-50%. After the primary oil recovery and secondary oil recovery, 40%-60% of the crude oil is still not exploited, and there is still significant economic value, and three oil recoveries are required. However, as the degree of well extraction increases, the viscosity of the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/54C08F218/12C09K8/584C09K8/588C09K8/88
CPCC08F285/00C09K8/584C09K8/588C09K8/882C08F220/54C08F218/12
Inventor 沙勇陈帅蓝加洪周道伟
Owner XIAMEN UNIV
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