A flexible controlled-release microsphere dispersion system formed from natural water-soluble polymer and its preparation and application in enhanced oil recovery

A water-soluble polymer and dispersion system technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor biodegradability and hidden dangers in application, achieve good stability, reduce oil-water interfacial tension, and have no The effect of secondary pollution

Active Publication Date: 2017-06-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The polymer microspheres that have been reported so far are synthesized by chemical methods, and their biodegradability is poor, so there are certain hidden dangers in their application.

Method used

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  • A flexible controlled-release microsphere dispersion system formed from natural water-soluble polymer and its preparation and application in enhanced oil recovery
  • A flexible controlled-release microsphere dispersion system formed from natural water-soluble polymer and its preparation and application in enhanced oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A flexible controlled-release microsphere dispersion system formed by a natural water-soluble polymer, including an aqueous solution of a natural water-soluble polymer containing carboxyl and hydroxyl groups, an aqueous solution of an inorganic salt, and an octane emulsion dispersed by a surfactant;

[0044] The surfactant-dispersed octane emulsion is obtained by adding octane to an aqueous surfactant solution and dispersing it uniformly;

[0045] The mass ratio of the natural water-soluble polymer aqueous solution containing carboxyl and hydroxyl groups, inorganic salt solution and surfactant-dispersed octane emulsion is 12:50:2.4;

[0046]The mass concentration of the described natural water-soluble polymer aqueous solution is 0.6%, the concentration of the described inorganic salt solution is 8000ppm, the mass concentration of the described surfactant aqueous solution is 0.1%, and the described surfactant aqueous solution and octane The mass ratio of alkane is 2:1; ...

experiment example 1

[0055] The flexible controlled-release microspheres prepared in Example 1 were placed in a flowing mineralized aqueous solution with a salinity of 2000ppm, the temperature of the constant mineralized water was 40°C, and the formation environment was simulated to observe the size change of the flexible controlled-release microspheres and degradation.

[0056] The hydration expansion law of the flexible controlled-release microspheres in the process of free migration in the formation was monitored by a microscope, and the size of the flexible controlled-release microspheres changed with time as follows: figure 1 shown. from figure 1 It can be seen that, with the increase of time, the flexible controlled-release microspheres gradually expanded. Therefore, during the formation migration process, the flexible controlled-release microspheres will hydrate and expand until the plugging effect occurs.

[0057] After 300 days, the flexible controlled-release microspheres ruptured and...

experiment example 2

[0059] In Experimental Example 1, the surfactant will be released gradually during the expansion process of the flexible controlled-release microspheres. The external solution of the flexible controlled-release microspheres was collected by filtration, and the ability of the released surfactant to reduce the interfacial tension was measured by a spinning drop interfacial tensiometer. The model of the interfacial tensiometer used is TEXAS-500, and the experimental temperature is adjusted to 50°C. The oil phase used is Shengtuokou Outer Oil, and the rotational speed is adjusted to 6000r / min. It was found that the surfactant released by the flexible controlled-release microspheres Can reduce the oil-water interfacial tension to 10 within 15 minutes -2 mN.m -1 .

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Abstract

The invention relates to a flexible controlled-release microsphere disperse system formed by a natural water-soluble polymer and preparation thereof and application of the system in reinforcement of oil extraction. The disperse system comprises an aqueous solution of the natural water-soluble polymer containing carboxyl and hydroxyl groups, an aqueous solution of an inorganic salt and a surfactant-dispersed octane emulsion, wherein the surfactant-dispersed octane emulsion is prepared by adding octane into an aqueous surfactant solution and carrying out uniform dispersion. According to the invention, the natural water-soluble polymer used in the invention is widely available, regenerable and environment-friendly, contains a great number of hydroxyl groups and a proper amount of carboxyl groups in the molecular chains and can form a flexible controlled-release microsphere with proper chain density and a flexible core-shell structure in the presence of multivalent inorganic salt ions. The flexible controlled-release microsphere migrates in holes in strata and can plug large holes, improve injection pressure and adjust injection profile.

Description

technical field [0001] The invention relates to a microsphere dispersion system formed by a natural water-soluble polymer, which can be used for plugging and profile control in oil field water injection production, and can carry high-efficiency oil displacement agent deep into the reservoir for controlled release, reducing the interfacial tension of crude oil, and once It can significantly increase the recovery rate and belongs to the field of oil field chemistry. Background technique [0002] As a strategic resource, oil plays an important role in its effective exploitation and utilization. Since oil is a non-renewable resource, with the continuous improvement of productivity, the society's demand for oil has risen sharply, and the chance of rediscovering large reserves of oil reservoirs has decreased, so that the improvement of the recovery rate of developed oil fields has attracted much attention, and technical means have been adopted Enhanced oil recovery has become a n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514C09K8/516C09K8/584
CPCC09K8/514C09K8/516C09K8/584
Inventor 李英孙艳阁
Owner SHANDONG UNIV
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