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Polymeric acid solution thickener

A technology of polymer acid and thickener, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of unfavorable large-scale industrial production, high reaction temperature of preparation process, increase of product dissolution time, etc., and achieve production High efficiency, reduced production costs, and mild production conditions

Inactive Publication Date: 2017-07-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product is easy to transport and the process is simple, but the reaction temperature of the preparation process is too high, which is not conducive to large-scale industrial production, and the introduction of the cross-linking agent will also increase the dissolution time of the product in the acid solution, affecting on-site use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation technology of polymer acid solution tackifier of the present invention comprises the following steps:

[0031] (a) Add 30g of monomer to 100g of distilled water and stir to dissolve, wherein acrylamide is 80% of the total molar weight of the monomer, sodium styrene sulfonate is 10% of the total molar weight of the monomer, and acryloyloxyethyl Trimethylammonium chloride is 10% of the total molar weight of monomers.

[0032] (b) The reaction solution is added to a three-necked round-bottomed flask, and nitrogen is vented to adjust the bubbles to be uniform and consistent;

[0033] (c) Use 10% NaOH solution to adjust the pH value to be neutral, heat to 45°C, and keep the temperature constant for 30min;

[0034] (d) adding initiator (NH 4 ) 2 S 2 o 8 -NaHSO 3 , the mass concentration of the initiator was 0.3% of the total mass of the monomers, nitrogen was continued, and the reaction was continued for 4 hours.

[0035] (e) after precipitation, filtra...

Embodiment 2

[0040] The preparation technology of polymer acid solution viscosifier comprises the following steps:

[0041] (a) Add 25g of monomer to 100g of distilled water and stir to dissolve, wherein acrylamide is 90% of the total molar weight of the monomer, sodium styrene sulfonate is 5% of the total molar weight of the monomer, and acryloyloxyethyl Trimethylammonium chloride is 5% of the total molar weight of monomers.

[0042] (b) The reaction solution is added to a three-necked round-bottomed flask, and nitrogen is vented to adjust the bubbles to be uniform and consistent;

[0043] (c) Use 10% NaOH solution to adjust the pH value to be neutral, heat to 50°C, and keep the temperature constant for 30min;

[0044] (d) adding initiator (NH 4 ) 2 S 2 o 8 -NaHSO 3 , the mass concentration of the initiator was 0.7% of the total mass of the monomers, nitrogen was continued, and the reaction was continued for 5 hours.

[0045] (e) after precipitation, filtration, and vacuum drying a...

Embodiment 3

[0050] The preparation technology of polymer acid solution viscosifier comprises the following steps:

[0051] (a) Add 30g of monomer to 100g of distilled water and stir to dissolve, wherein acrylamide is 75% of the total molar weight of the monomer, sodium styrene sulfonate is 15% of the total molar weight of the monomer, and acryloyloxyethyl Trimethylammonium chloride is 10% of the total molar weight of monomers.

[0052] (b) The reaction solution is added to a three-necked round-bottomed flask, and nitrogen is vented to adjust the bubbles to be uniform and consistent;

[0053] (c) Use 10% NaOH solution to adjust the pH value to be neutral, heat to 40°C, and keep the temperature constant for 30min;

[0054] (d) adding initiator (NH 4 ) 2 S 2 o 8 -NaHSO 3 , the mass concentration of the initiator was 0.7% of the total mass of the monomers, nitrogen was continued, and the reaction was continued for 8 hours.

[0055] (e) after precipitation, filtration, and vacuum drying a...

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Abstract

The purpose of the invention to provide a polymeric acid solution thickener. The thickener has excellent resistance to a high temperature and shearing, and can meet high temperature and deep well construction requirements. The ternary copolymeric acidified fracturing thickener obtained in the invention can be used for thickening an acid solution with the hydrochloric acid concentration of 5-28%, the apparent viscosity of the thickener at room temperature is 100 mPa.s or above, the viscosity retention rate at 90 DEG C still reaches 60% or above, the viscosity at 110 DEG C can still reach 30 mPa. s or above, and the thickener has good thickening and temperature resisting performances. Compared with conventional preparation technologies, a technology disclosed in the invention has the advantages of high production efficiency, simplicity, mild production conditions, easiness in control of the polymerization process, great reduction of the production cost, and easiness in industrial promotion; and the above product has the advantages of good solubility, convenience in transportation, and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of oil field chemicals, and in particular relates to a polymer acid thickener. Background technique [0002] In recent years, a number of deep or ultra-deep carbonate oil and gas reservoirs have been discovered and developed in my country. Due to poor reservoir physical properties, low porosity and permeability, such reservoirs usually cannot provide the seepage required for economic development. Most of the channels have no natural production capacity, so acid fracturing, acidizing and other measures are required for reservoir reconstruction. [0003] Conventional acid solution has many disadvantages such as low viscosity, small penetration depth, fast filtration rate, serious corrosion, etc., and the acidification transformation often fails to achieve the expected effect. Thickening acid, as a kind of slow acid, has a good effect on medium, high and even low permeability with cracks. By adding a thickener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/88C08F220/56C08F212/14C08F220/34
CPCC08F220/56C09K8/74C09K8/882C08F212/14C08F220/34C09K2208/32C08F212/30
Inventor 赵明伟戴彩丽徐中良由庆孙永鹏吴一宁赵光高明伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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