Temperature-resistant salt-resistant profile control plugging agent and preparation method thereof

The technology of profile control and water shutoff agent and regulator is applied in the directions of chemical instruments and methods, drilling compositions, etc., and can solve the problems of general temperature resistance and salt resistance, high formation water salinity, and high formation temperature of oil wells. Achieve the effect of improving thermal stability and salt resistance, high viscosity and high gel strength

Inactive Publication Date: 2017-05-17
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's oilfields generally adopt the water injection development method, the formation heterogeneity is serious, the reservoir geology is complex, the oil well formation temperature is high, and the formation water salinity is high
Commonly used profile control and water shutoff agents have average temperature and salt resistance, short gelation time at high temperature, low gel viscosity, and limited field application

Method used

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  • Temperature-resistant salt-resistant profile control plugging agent and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0026] Preparation of temperature and salt resistance polyacrylamide:

[0027] The raw materials in parts by weight are: acrylamide 200, acrylic acid 50, 2-acrylamide-2-methylpropanesulfonic acid 15, styrene sodium sulfonate 4, sodium hydroxide 30.6, deionized water 700, sodium formate 0.002, azobisiso Butyronitrile 0.3, potassium persulfate 0.012, sodium bisulfite 0.008. The temperature and salt resistance polyacrylamide has a molecular weight of 18.9 million and a degree of hydrolysis of 20%.

[0028] Preparation of temperature and salt resistance profile control and water shutoff agent:

[0029] The weight parts of raw materials are: temperature and salt resistance polyacrylamide 1.5, hexamethylol melamine 0.4, aluminum citrate 0.06, ethylenediamine tetramethylene phosphate sodium 0.07, ammonium acetate 3, water 995.

[0030] Add ammonium acetate to the water, after fully dissolving, add temperature and salt-resistant polyacrylamide, stir at room temperature for 3 hours, then add ...

example 2

[0032] Preparation of temperature and salt resistance polyacrylamide:

[0033] The weight parts of raw materials are: acrylamide 170, acrylic acid 30, 2-acrylamide-2-methylpropanesulfonic acid 10, styrene sodium sulfonate 3, sodium hydroxide 18.6, deionized water 768, sodium formate 0.0012, azobisiso Butyronitrile 0.3, potassium persulfate 0.012, sodium bisulfite 0.008. The temperature and salt-resistant polyacrylamide has a molecular weight of 20.2 million and a degree of hydrolysis of 15%.

[0034] Preparation of temperature and salt resistance profile control and water shutoff agent:

[0035] The parts by weight of the raw materials are: temperature-resistant and salt-resistant polyacrylamide 2, hexamethylolmelamine 0.6, aluminum citrate 0.05, sodium ethylenediamine tetramethylene phosphate 0.04, ammonium acetate 5, and water 992.

[0036] Add ammonium acetate to the water, after fully dissolving, add temperature and salt-resistant polyacrylamide, stir at room temperature for 3 ho...

example 3

[0038] Preparation of temperature and salt resistance polyacrylamide:

[0039] The parts by weight of raw materials are: acrylamide 150, acrylic acid 45, 2-acrylamide-2-methylpropanesulfonic acid 20, styrene sodium sulfonate 5, sodium hydroxide 28.8, deionized water 751, sodium formate 0.0008, azobisiso Butyronitrile 0.3, potassium persulfate 0.012, sodium bisulfite 0.008. The temperature and salt resistance polyacrylamide has a molecular weight of 22.6 million and a degree of hydrolysis of 23%.

[0040] Preparation of temperature and salt resistance profile control and water shutoff agent:

[0041] The weight parts of the raw materials are: temperature-resistant and salt-resistant polyacrylamide 2.5, hexamethylolmelamine 0.8, aluminum citrate 0.03, ethylenediamine tetramethylene phosphate sodium 0.05, ammonium acetate 4, and water 992.6.

[0042] Add ammonium acetate to the water, after fully dissolving, add temperature and salt-resistant polyacrylamide, stir at room temperature for...

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Abstract

The invention discloses a temperature-resistant salt-resistant profile control plugging agent and a preparation method thereof. The temperature-resistant salt-resistant profile control plugging agent is prepared from the following raw materials in parts by weight: 1-3 parts of temperature-resistant salt-resistant polyacrylamide, 0.15-1.2 parts of crosslinking agent A, 0.03-0.1 part of crosslinking agent B, 0.01-0.1 part of setting retarder, 1-7.5 parts of pH regulator and 988-997 parts of water. The preparation method comprises the following steps: adding the pH regulator into the water, sufficiently dissolving, adding the temperature-resistant salt-resistant polyacrylamide, stirring for 2-4 hours, adding the setting retarder and crosslinking agent B, stirring at normal temperature for 1-2 hours, adding the crosslinking agent A, stirring uniformly, and standing at the constant temperature of 70-90 DEG C for 3-5 days. The profile control plugging agent has the characteristics of temperature resistance, salt resistance, high gel strength, adjustable gelling time and the like, has selectivity for oily water plugging, and can enter the deep part of the oil reservoir after being injected to plug the high-transmissibility paths, thereby improving the waterflooding development effect and enhancing the recovery ratio of the oil reservoir.

Description

Technical field [0001] The invention relates to the technical field of profile control and water shutoff agents for oil reservoirs and preparation techniques, and in particular to a temperature and salt resistance profile control and water shutoff agent and a preparation method. Background technique [0002] In oil fields developed by water injection, after a stage of exploitation, the formation is multi-layered and heterogeneous. As the amount of water injected into the oil layer increases, the injection profile is very uneven. Some blocks have very high water content, while others have insignificant water injection effects. In some blocks, the injected water quickly breaks through the high-permeability layer. The erosion of the high-permeability layer by water increases its permeability and makes The heterogeneity of the formation is further expanded, resulting in a large amount of water from the oil well and a decrease in oil production. In order to make the injected water ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08F220/56C08F220/06C08F220/58C08F212/14C08F2/38C08J3/24C08K5/3492C08K5/098
CPCC08F2/38C08F220/56C08J3/24C08J2333/26C08K5/098C08K5/34922C09K8/512C08F220/06C08F220/585C08F212/14
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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