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Preparation process of cross-linked polymer clew

A technology of cross-linked polymers and coils, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve problems affecting the rate of cross-linking reactions, precipitation, and inability to form cross-linked polymer coils, etc.

Inactive Publication Date: 2007-02-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when oilfield sewage is used, certain inorganic ions, organic substances and mechanical impurities in the sewage may react with the above-mentioned chemical agents, reduce the concentration of chemical agents, and affect the rate of cross-linking reactions, resulting in flocculation and precipitation in the system, and even failure to form cross-linking reactions. Polymer Coils

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare the oil phase: Weigh 48 grams of base oil isoparaffin (viscosity 10.85cP), add it to a 250 ml three-neck flask with stirring, add 19.2 grams of sorbitan monooleate (Span-80) With 12.8 grams of polyoxyethylene sorbitan monostearate (20) ether (Tween-60) two kinds of non-ionic surfactants, mix as oil phase after;

[0049] Preparation of water phase: Weigh 21.8 grams of conventional water-soluble monomer acrylamide, 6.9 grams of sodium acrylate, functional water-soluble monomer N, N'-diallyl-N, N, N', N'-tetra 0.62 grams of methylhexammonium chloride, its molecular structure contains two double bonds, 1.33 grams of salt anhydrous sodium acetate, 0.98 milligrams of disodium edetate as a chelating agent, 1.31 milligrams of urea as a cosolvent, and 1.31 milligrams of an oxidizing initiator. 0.88 milligrams of ammonium sulfate, the above various ingredients are dissolved in 34.4 grams of deionized water (conductivity ≤ 4μS / cm) as the water phase stand-by;

[0050] Sta...

Embodiment 2

[0055] Prepare the oil phase identical with embodiment 1;

[0056] Prepare the water phase: the functional water-soluble monomer is 0.50 g of N, N'-di-p-vinylbenzyl-N, N, N', N'-tetramethylhexamethylenedichloride, and its molecular structure contains two Double bond, other compositions are identical with embodiment 1;

[0057] Start stirring, and slowly add the above-mentioned water phase to the above-mentioned oil phase, and form a stable W / O microemulsion (conductivity≤0.15μS / cm) after the two are mixed evenly;

[0058] Set 25°C as the initiation temperature. First, inject high-purity nitrogen gas into the above-mentioned stable W / O microemulsion to drive oxygen, reduce the oxygen content in the system (≤0.3μg / g) to initiate the polymerization reaction, and then inject Sulfur dioxide gas is combined with ammonium persulfate in the water phase to form an oxidation-reduction initiation system, so that the polymerization reaction is fully carried out, and a W / O microemulsion c...

Embodiment 3

[0062] Prepare the oil phase: Weigh 45.0 grams of base oil isoparaffin (viscosity 10.85cP), add it to a stirred 250 ml three-necked flask, add 18.0 grams of Span-80 and 12.0 grams of Tween-60 two non-ionic Surfactant, mixed evenly as oil phase;

[0063] Weigh respectively 25.3 grams of conventional water-soluble monomer acrylamide, 8.5 grams of sodium acrylate, and 1.99 grams of functional water-soluble monomer two-p-vinylbenzyl polyethylene glycol (2000), whose molecular structure contains two double bonds, 1.53 grams of anhydrous sodium acetate, 1.13 milligrams of disodium edetate, 1.52 milligrams of urea, and 1.08 milligrams of oxidative initiator ammonium persulfate were dissolved in 39.2 grams of deionized water (conductivity ≤ 4 μS / cm) as the water phase. use;

[0064] Start stirring, and slowly add the above-mentioned water phase to the above-mentioned oil phase, and form a stable W / O microemulsion (conductivity≤0.15μS / cm) after the two are mixed evenly;

[0065] Set ...

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Abstract

The invention discloses a cross-linked polymer clew preparing method, including: dissolving surfactant and oil-soluble initiator in a basic oil to act as a oil phase; dissolving functional water soluble monomer and routine water soluble monomer in water to act as a water phase; uniformly mixing the oil and water phases, forming stable W / O type microemulsion, according to the set initiating temperature, charging inert gases into the microemulsion to drive out oxygen, reducing the oxygen content in the system to initiate polymerization reaction, and obtaining cross-linked polymer clew in the microemulsion. It can change the structure and use quality of the functional water soluble monomer to regulate the size and deforming ability of the cross-linked polymer clew in the water solution, able to make the cross-linked polymer clew able to improve and eliminate the adverse factors of influencing recovery ratio increase by the injected water fast advancing in the high osmotic layer, by absorption and stay in the multiporous medium to complete effective plugging according to oil storage characteristics and recovery degree, increasing crude oil recovery ratio for water-flooding oil storage development.

Description

technical field [0001] The invention relates to a preparation method of a chemical agent capable of improving the heterogeneity of oil reservoirs and increasing the oil recovery rate of water injection development oil reservoirs, in particular to a preparation method of cross-linked polymer coils, belonging to the field of petroleum processing . Background technique [0002] At present, the early development of oil fields has gradually entered the middle and late stages of water flooding. How to further improve the volumetric sweep coefficient of injected water and the displacement efficiency within the water sweep volume, and economically and effectively exploit existing oil fields is a major issue to be solved urgently by the petroleum industry. One, in which the development and application of enhanced oil recovery technology has played an important role. [0003] There are many enhanced oil recovery technologies, and the methods based on improving the displacement effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/32C09K8/04
Inventor 郑晓宇马玉华孟静赵怀珍李明远
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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