Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof

A temperature-resistant, salt-resistant and thickener technology, applied in the field of polymers, can solve the problems of sewage solution stability, inability to adapt to temperature resistance of 90°C, and decline in temperature-resistant and salt-resistant performance, and achieves uncompromising synthesis conditions and high production efficiency. High efficiency and improved stability

Active Publication Date: 2011-04-27

CHINA PETROLEUM & CHEM CORP +1

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AI-Extracted Technical Summary

Problems solved by technology

The performance evaluation results show that the effect is better than HPAM only in low-temperature and low-salt environments. The main problems include: ① solubility problems caused by hydrophobic groups; ② temperature and salt resistance due to intramolecular association problems; ③solution injection problems; ④sew...

Abstract

The invention relates to a heat-resistant and salt-resistant polymer thickening agent and a preparation method thereof. The thickening agent is generated by copolymerization of water-soluble compound with olefin groups and maleimide compound. The thickening agent has high viscosity in water body with high mineralized degree and positive divalent ion concentration and has better viscosity maintaining performance under the conditions of high temperature, high shear strength and high shear frequency, thus meeting the technical requirements for the thickening agent under the conditions of high temperature and high salinity in tertiary oil recovery at present, and improving the recovery ratio of a II or III type of oil reservoir in the tertiary oil recovery.

Application Domain

Drilling composition

Technology Topic

IonWater soluble +11

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Examples

Experimental program(6)

Example Embodiment

[0032] Example 1

[0033] 180 parts by mass of acrylamide (AM) and 20 parts of N-acetoxymaleimide represented by structural formula 1 were dissolved in 1000 parts of water under stirring.

[0034] [Structural formula 1]

[0035]

[0036] At room temperature, after deoxygenating the aqueous solution with nitrogen for 30 minutes, adjust the pH value of the solution to 9.2, add 0.02 parts of initiator 2,2-azobis(2-methylpropionamidine) hydrochloride (AIBA) under stirring, Reacting at a constant pressure of 60°C for 6 hours to obtain a colloidal polymer solution product. The product is dried, granulated and crushed to obtain a temperature-resistant and salt-resistant thickener product.

Example Embodiment

[0037] Example 2

[0038] 120 parts by mass of acrylamide (AM), 60 parts of acrylic acid and 20 parts of N-hydroxymaleimide shown in structural formula 2 were dissolved in 1000 parts of water under stirring.

[0039] [Structural formula 2]

[0040]

[0041] At room temperature, after deoxygenating the aqueous solution with nitrogen for 30 minutes, adjust the pH of the solution to 9, add 0.01 parts of ammonium persulfate and 0.01 parts of sodium bisulfite as the redox initiation system under stirring, and react at a constant pressure at 30°C After 7 hours, a colloidal polymer solution product was obtained. The product is dried, granulated and crushed to obtain a temperature-resistant and salt-resistant thickener product.

Example Embodiment

[0042] Example 3

[0043] Dissolve 150 parts by mass of acrylamide (AM), 100 parts of N-vinylpyrrolidone (NVP) and 20 parts of sodium N-ethylsulfonate maleimide as shown in structural formula 3 under stirring In 1000 parts of water.

[0044] [Structural formula 3]

[0045]

[0046] At room temperature, after deoxygenating the aqueous solution with nitrogen for 30 minutes, adjust the pH of the solution to 8.9 and add 0.015 parts of the initiator 2,2-azobis(2-methylpropionamidine) hydrochloride (AIBA) while stirring. The reaction was kept at a normal pressure at 50°C for 6 hours to obtain a colloidal polymer solution product. The product is dried, granulated and crushed to obtain a temperature-resistant and salt-resistant thickener product.

[0047] Thickener product performance test

[0048] The performance of the obtained temperature-resistant and salt-resistant thickener product was compared with traditional polyacrylamide under the same conditions. The results are shown in Table 1 and figure 1.

[0049] Table 1 shows the viscosity data of an aqueous solution of a temperature-resistant and salt-resistant thickener product at a concentration of 1500 mg/L at room temperature. It can be seen from the obtained data that the aqueous solution of Example 3 has a higher viscosity when there is a large difference in molecular weight, and as the solution salinity increases, the viscosity drop is smaller than that of the traditional polyacrylamide. It has excellent salt resistance.

[0050] figure 1 It is the viscosity retention performance of the temperature-resistant and salt-resistant thickener aqueous solution at 80°C. The viscosity of the thickener aqueous solution obtained in Example 3 remained at 91% after 72 hours, which was significantly higher than that of traditional polyacrylamide, indicating that it has good temperature resistance.

[0051] Table 1

[0052]

[0053] (Polymer concentration 1500mg/L, salinity 32868mg/L, divalent ion concentration 800mg/L, shear rate 7.34/S)

PUM

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve stability

Agent delivering system comprised of microparticle and biodegradable gel with an improved releasing profile and methods of use thereof

InactiveUS6287588B1increase stabilityimprove stability

Owner:BTG INT LTD

Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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