Alkali-resisting polymer for displacement of reservoir oil of oil field and preparation method thereof

A polymer and alkali-resistant technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as viscosity reduction, temperature resistance, and viscosity increase ability, and achieve good viscosity increase and thermal stability. The effect of good chemical stability and good thermal stability

Inactive Publication Date: 2015-01-28
黑龙江吉地油田服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional linear polyacrylamide has the following problems in the environment of high salinity and high alkalinity: first, under the condition of high salinity and high salt, the viscosity-increasing ability of the partially hydrolyzed polyacrylamide solution is significantly reduced; Valence cations such as calcium and magnesium can precipitate with the carboxyl groups on the molecular chain of polyacrylamide under certain conditions; second,

Method used

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  • Alkali-resisting polymer for displacement of reservoir oil of oil field and preparation method thereof
  • Alkali-resisting polymer for displacement of reservoir oil of oil field and preparation method thereof
  • Alkali-resisting polymer for displacement of reservoir oil of oil field and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1.1 The raw material composition (parts by weight) of the alkali-resistant polymer used for oil field displacement of the present invention:

[0025]

[0026] 1.2 The preparation method of the alkali-resistant polymer used for oil field displacement of the present invention:

[0027] Dissolve acrylamide in deionized water to make an aqueous solution, add sodium carbonate and stir evenly, add anionic monomers, hydrophobic monomers, alkali-resistant monomers, and surfactants, stir evenly, transfer to the reactor, and add 1 #Initiator, continue to pass nitrogen for 10 minutes and add 2# initiator, add nitrogen for 10 minutes to add 3# initiator, continue to pass nitrogen until the reaction system has a temperature of 1-2 ° C, stop nitrogen, and wait for the reaction system to reach a peak temperature of 85-95 ℃, heat preservation for 6 hours, cutting, granulation, drying and crushing to obtain the alkali-resistant polymer of the present invention.

Embodiment 2

[0029] 2.1 The raw material composition (parts by weight) of the alkali-resistant polymer used for oil field displacement of the present invention:

[0030]

[0031] 2.2 The preparation method of the alkali-resistant polymer used for oil field displacement of the present invention:

[0032] 1.2 with embodiment 1.

Embodiment 3

[0034] 3.1 The raw material composition (parts by weight) of the alkali-resistant polymer used for oil field displacement of the present invention:

[0035]

[0036]

[0037] 3.2 The preparation method of the alkali-resistant polymer used for oil field displacement of the present invention:

[0038] 1.2 with embodiment 1.

[0039] The polymer prepared by embodiment 1-3 is carried out viscosity measurement, method and result are as follows:

[0040] Determination method: the polymer is formulated into a 5000ppm solution, diluted with 1.2% sodium hydroxide solution to a solution with a concentration of 1000ppm, and the viscosity is measured with a DV-III viscometer at 45°C.

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Abstract

The invention discloses an alkali-resisting polymer for displacement of reservoir oil of an oil field and a preparation method thereof. The alkali-resisting polymer is prepared from the following components in parts by weight: 70-130 parts of acrylamide, 10-25 parts of a negative ion monomer, 2-5 parts of a hydrophobic monomer, 2-6 parts of an alkali-resisting monomer, 0.1-0.6% of a surfactant, 13-26 parts of sodium carbonate and 200-400 parts of deionized water. The preparation method disclosed by the invention comprises the following steps: preparing an aqueous solution by acrylamide; adding sodium carbonate, negative ion monomer, hydrophobic monomer, alkali-resisting monomer and surfactant; transferring into a reactor; introducing nitrogen for 30 minutes; adding a 1# initiator; continuously introducing nitrogen for 10 minutes; adding a 2# initiator; introducing nitrogen for 10 minutes and adding a 3# initiator; continuously introducing nitrogen till the temperature is raised to 1-2 DEG C; stopping introduction of nitrogen; raising the temperature to peak temperature and insulating for 6 hours; and cutting, granulating, drying and crushing. By adding the alkali-resisting monomer into the alkali-resisting polymer disclosed by the invention, the viscosity of the product is not reduced in a ternary system. The viscosity retention rate for 90 days is over 80%.

Description

technical field [0001] The invention relates to the technical field of oil field flooding, in particular to an alkali-resistant polymer used for oil field flooding and a preparation method thereof. Background technique [0002] At present, many water flooding oil fields in China have entered the middle and late stages. Due to the heterogeneity of reservoirs and unfavorable mobility ratio in this period, there is still a large amount of remaining oil in the strata after water flooding, which is generally manifested as high water cut in oil wells. The output is low and the economic benefits of exploitation are poor. In order to ensure the stable production of the oil field, increase production and solve the contradiction between oil production and market demand, chemical flooding is a constant and beneficial method of enhancing oil recovery, mainly including polymer flooding, Alkali / polymer flooding, alkali / polymer / surfactant flooding. [0003] At present, the conventional li...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/18C08F230/08C08F220/16C08F220/04C09K8/588
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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