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Acrylamide terpolymer and polymer and preparation method and application thereof

An acrylamide-based terpolymer, polymerization reaction technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large difference in acrylamide copolymerization activity, poor water solubility, use, etc., to achieve anti-corrosion Effects of high shear rate and enhanced oil recovery, good solubility and injectability, and increased oil recovery

Active Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] At present, temperature-resistant and salt-resistant monomers, such as 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N-vinylpyrrolidone (NVP) or N, N-dimethylacrylamide (DMAM) and Acrylamide copolymerization has improved the temperature and salt resistance of polyacrylamide to a certain extent, but it still cannot fully meet the requirements of the three types of oil reservoirs, mainly due to the following disadvantages of the above-mentioned acrylamide binary copolymers: ① Due to the difficulty in preparing the relative molecular mass For higher binary copolymers, the apparent viscosity of the solution is not high under high-temperature and high-salt formation conditions; Not high, its heat resistance stability and salt resistance need to be further improved; ③ When injected into the wellhead, the high-speed shear resistance needs to be improved urgently; ④ The dissolution time needs to be shortened
[0008] Literature (Properties of Biomedical Pressure-Sensitive Adhesive Copolymer Films with Pendant Monosaccharides, J Appl Polym Sci, 1995, 56: 1615) reports a preparation method of butyl acrylate-glucosyloxyethyl methacrylate copolymer: In a glass test tube, add a certain amount of dimethyl sulfoxide, butyl acrylate, glucosyloxyethyl methacrylate, and azobisisobutyronitrile, blow nitrogen to remove oxygen, and react at 70°C for 12 hours. The product is precipitated with water / acetone to obtain butyl acrylate-glucosyloxyethyl methacrylate copolymer, but butyl acrylate-glucosyloxyethyl methacrylate copolymer is very poor in water solubility and cannot be used as an EOR oil displacing agent use

Method used

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  • Acrylamide terpolymer and polymer and preparation method and application thereof

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[0044] The invention provides a method for preparing a polymer, which is characterized in that the preparation method comprises the following steps: under the solution polymerization reaction conditions of olefins, in the presence of an initiator, a monomer mixture is polymerized in water, wherein It is characterized in that the monomer mixture contains monomer D, monomer E and monomer F, the monomer D has the structure shown in formula (15), and the monomer E has the structure shown in formula (16)-formula ( 18) At least one of the monomers with the structure shown in the formula (19)-(21), and the monomer F is at least one of the monomers with the structure shown in the formula (19)-(21), and in the monomer mixture Based on the total number of moles of monomers, the content of the monomer D is 5-95 mol%, the content of the monomer E is 2.5-90 mol%, and the content of the monomer F is 0.5-90 mol%. ; Preferably, the content of the monomer D is 10-70 mol%, the content of the mo...

Embodiment 1

[0073] At room temperature, the monomer of the structure shown in the acrylamide (AM) of 50.0g, the AMPS of 50.0g and the formula (23) of 35.3g (according to document Macromolecules, 1995, Vol.28, No.8, 2961-2968 method prepared) into a reaction flask, add 287.0 g of deionized water, stir to dissolve the monomer completely, then slowly add 38.6 g of NaOH aqueous solution with a concentration of 25% by weight, and stir evenly. Add 5.5 g of 1 wt % EDTA aqueous solution, 1.1 g of 1 wt % azobisisobutylamidine hydrochloride aqueous solution, chain extender N, N'-dimethylethylenediamine 0.066 g, urea 0.11 g respectively in the flask g, stir well to make it evenly mixed. The pH of the system was adjusted to 7.5 with 1% by weight sodium hydroxide solution. The initial temperature of the system was controlled to 4° C., and 1.1 g of 1% by weight ammonium persulfate aqueous solution was added after 30 minutes of nitrogen deoxygenation, and nitrogen deoxygenation was continued for 20 min...

Embodiment 2

[0079] 45.0 g of AM, 34.2 g of N-vinylpyrrolidone NVP and 103.2 g of monomers of the structure shown in formula (25) (according to the method of document Macromolecules, 1995, Vol.28, No.8, 2961-2968 (obtained) into the polymerization bottle, add 495g of deionized water, stir to make the monomer completely dissolved, respectively add 5.65g of sodium citrate aqueous solution with a concentration of 0.1% by weight in the flask, and add 2,2’ with a concentration of 0.1% by weight -Azobis[2-(2-imidazoline-2-propane)-dihydrochloride aqueous solution 1.13g, add chain extender N,N'-dimethylpropylenediamine 0.01g, adding concentration is 0.1% by weight Add 0.01 g of sodium formate to 1.13 g of sodium bisulfite solution, stir well to make it evenly mixed. The initial temperature of the system was controlled to 4° C., and after 30 minutes of nitrogen deoxygenation, 1.0 g of a 1% by weight potassium persulfate aqueous solution was added and nitrogen deoxygenation was continued for 10 min...

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Abstract

The invention provides an acrylamide terpolymer, characterized in that the acrylamide terpolymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit of formula (1), the structural unit B is at least one of the structural units of formula (2)-(4), the structural unit C is at least one of the structural units of formula (5)-(7), and the viscosity-average molecular weight of the acrylamide terpolymer is 18,000,000-28,000,000. The invention further provides a polymer and its preparation method and application. According to the invention, the polymer of the invention has the advantages of high viscosity, good dissolvability, good high-speed shearing resistance, good injection and good advancing value of recovery efficiency.

Description

technical field [0001] The present invention relates to an acrylamide terpolymer, a preparation method of a polymer and a polymer prepared by the method, and the acrylamide terpolymer and the polymer are used as polymer oil flooding application of the agent. Background technique [0002] Today, domestic oilfields have generally entered a period of high water-cut development, polymer flooding EOR technology represented by high-molecular-weight partially hydrolyzed polyacrylamide (HPAM) has been effective, and in a low-temperature, low-salt environment , Secondary reservoirs are widely used. However, in view of the formation conditions of high temperature and high salinity in the three types of oil reservoirs, high molecular weight partially hydrolyzed polyacrylamide (HPAM) has poor salt tolerance, easy hydrolysis, easy degradation, complexation with divalent metal ions such as calcium and magnesium, and easy formation The actual oil displacement efficiency in the three type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F216/14C08F226/10C09K8/588
Inventor 杜凯赵方园计文希刘晓光
Owner CHINA PETROLEUM & CHEM CORP
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