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Modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil

A surfactant and polyvinyl alcohol technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor oil displacement efficiency and complex composition of oil displacement systems

Active Publication Date: 2016-02-17
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of existing surfactants such as poor oil displacement efficiency in the tertiary oil recovery process and complex composition of the oil displacement system, to provide a simple oil displacement system, strong oil washing ability, and no damage to formations and oil wells. A modified PVA polyvinyl alcohol polymer surfactant for oil displacement that causes harm and does not corrode equipment and pipelines

Method used

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  • Modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil
  • Modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil
  • Modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment P

[0014] Example PVA and oleic acid

[0015] Heat the PVA aqueous solution with a mass fraction of 10% to 90°C, use hydrochloric acid to adjust the pH to 2, then add oleic acid, the amount of PVA and oleic acid is 20:1 (mass ratio), and react for 2 to 4 hours. After the reaction, the performance test of the obtained product was carried out.

[0016] Reaction equation:

[0017]

[0018] Among them, R is -C 17 h 34 The structure is the same as that of the long chain of oleic acid, m and n are subscripts, representing the number of repeating units, among which 100<m<120, 1580<n<1600. The model of polyvinyl alcohol used in this example is PVA-1788, that is, the degree of polymerization is 1700, and the degree of alcoholysis is 88%.

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Abstract

The invention provides modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil and relates to polymer surfactant. The modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil is simple in displacement system, high in oil washing capability, free of damage to a stratum or an oil well and free of corrosion to equipment and pipelines. The modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil is composed of water-soluble PVA and oil-soluble matter at the mass ratio of (100-20):1. Oleic acid and the like can be adopted as the oil-soluble matter. Water-soluble PVA and the oil-soluble matter react for 2-4 h under the condition of 90 DEG C, and the modified PVA polyvinyl alcohol polymer surfactant for displacement of reservoir oil is obtained. The prepared product contains a plurality of C18 hydrophobic chains each provided with a saturated bond, so that the product is water soluble and partially oil soluble, the compatibility of the surfactant and crude oil is increased, and thus the recovery ratio of crude oil is increased.

Description

technical field [0001] The invention relates to a polymer surfactant, in particular to a modified PVA polyvinyl alcohol polymer surfactant for oil displacement. Background technique [0002] In the petroleum industry, at the end of secondary oil recovery, a lot of crude oil remains in the rock crevices due to capillary action and cannot flow to production wells. Squeeze out of rock crevices. If a substance with strong miscibility with the oil phase can be injected, a uniform miscible phase can be formed with the crude oil, the capillary force of the retained oil in the pores will be reduced or disappeared, and the crude oil can be driven to the production well. The key to trying to enhance oil recovery is to find a suitable solvent that can dissolve well with crude oil. Exploration and research in this area began in the 1950s. Due to the high cost of hydrocarbons such as propane and natural gas, there has been a lot of research on polymers in recent years. The so-called ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08F18/08C08F8/12C08F8/14
CPCC08F8/12C08F8/14C09K8/584C08F18/08
Inventor 沙勇徐亚东
Owner XIAMEN UNIV
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