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Stabilizer for polymer solution under high temperature and high salt conditions, preparation method and application thereof

A polymer solution, high-temperature and high-salt technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as high cost, human health hazards, and reduce the viscosity of polymer solutions to achieve improved stability and protection Environmental and cost reduction effects

Active Publication Date: 2021-09-07
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the polymer solution is injected into the formation, it will be degraded under the influence of high temperature conditions, thereby greatly reducing the viscosity of the polymer solution; at the same time, under high-salt conditions, the formation contains a large number of divalent ions that will neutralize the negative charges of the polymer molecular chain, As a result, the polymer molecules cannot be effectively stretched to reduce the viscosity of the solution
At present, most of the stabilizers used to increase the viscosity of polymer solutions are thiourea compound systems, which can improve the stability of polymers under high temperature and high salt conditions, but there are still the following deficiencies in the use process: (1) high cost (2) Thiourea is a dangerous chemical, and long-term use will cause harm to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Accurately weigh raw materials (grams): lignin 10g, hydrogen peroxide 5g, sodium carbonate 5g and deionized water 980g. Preparation steps: 1) add lignin to deionized water at room temperature, and stir evenly at 100 rpm to prepare aqueous solution A; 2) weigh hydrogen peroxide at room temperature and add it to aqueous solution A, and stir at 100 rpm uniform, prepare aqueous solution B; 3) add sodium carbonate to solution B at room temperature, and stir at 100 rpm for 20 minutes to obtain the product.

Embodiment 2

[0016] Embodiment 2: Accurately weigh raw materials (grams): lignin 15g, hydrogen peroxide 7.5g, sodium carbonate 7.5g and deionized water 970g. Preparation steps: 1) add lignin to deionized water at room temperature, stir evenly at 150 rpm to prepare aqueous solution A; 2) weigh hydrogen peroxide at room temperature and add it to aqueous solution A, and stir at 150 rpm uniform, prepare aqueous solution B; 3) add sodium carbonate to solution B at room temperature, and stir at 150 rpm for 25 minutes to obtain the product.

Embodiment 3

[0017] Embodiment 3: Accurately weigh raw materials (grams): lignin 20, hydrogen peroxide 10, sodium carbonate 10 and deionized water 960. 1) Add lignin to deionized water at room temperature and stir evenly at 150 rpm , to prepare aqueous solution A; 2) weigh hydrogen peroxide at room temperature and add it to aqueous solution A, stir evenly at 150 rpm to prepare aqueous solution B; 3) add sodium carbonate to solution B at room temperature, Down stirring for 30 minutes, the product was obtained.

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Abstract

The invention belongs to the field of polymer stabilizers, and in particular relates to a stabilizer for a polymer solution under high temperature and high salt conditions, a preparation method and application thereof. The stabilizer of the polymer solution under high temperature and high salt conditions includes the following components in parts by mass: 10-20 parts of lignin, 5-10 parts of hydrogen peroxide, 5-10 parts of sodium carbonate and 900-1000 parts of deionized water. The hydrogen peroxide in the stabilizer of the polymer solution under the high temperature and high salt conditions of the present invention can moderately oxidize the lignin, remove the divalent metal ions contained in the lignin, and the sodium carbonate can precipitate the oxidized metal ions, and the treated lignin It can effectively remove oxygen and free divalent iron ions in the configuration water, so as to replace thiourea and improve the stability of the polymer solution, which can not only reduce the cost but also protect the environment.

Description

technical field [0001] The invention belongs to the field of polymer stabilizers, and in particular relates to a stabilizer for polymer solutions under high-temperature and high-salt conditions, a preparation method and application thereof. Background technique [0002] Polymer solution is currently a chemical agent system mainly used in the tertiary oil recovery process of various oil fields. Its oil displacement mechanism is to use the viscoelasticity of polymer solution to increase the swept volume to achieve the purpose of enhancing oil recovery. After the polymer solution is injected into the formation, it will be degraded under the influence of high temperature conditions, thereby greatly reducing the viscosity of the polymer solution; at the same time, under high-salt conditions, the formation contains a large number of divalent ions that will neutralize the negative charges of the polymer molecular chain, As a result, the polymer molecules cannot be stretched effecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 郭志强葛红江李冉易博雷齐玲熊英何丕祥袁肖肖程静杨卫华
Owner DAGANG OIL FIELD GRP
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