Terpolymer and polymer and preparation method and application thereof

A 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 high-speed shear resistance Enhanced performance 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; ② Due to the large difference in the copolymerization activity of the above-mentioned functional monomers and acrylamide, the content of functional monomers in the copolymer 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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  • Terpolymer and polymer and preparation method and application thereof

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preparation example Construction

[0050] 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 a structure shown in formula (17), and the monomer E has the structure shown in formula (18)-formula ( 20) At least one of the monomers of the structure shown in the monomer F is at least one of the monomers of the structure shown in formula (21)-formula (25), and the monomer in the monomer mixture Based on the total number of moles, 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 Preferably, the content of the monomer D is 10-70 mol%, the content of the monomer E is 20-50 mol...

Embodiment 1

[0081]At room temperature, 50.0 g of acrylamide (AM), 50.0 g of AMPS and 35.3 g of monomers of the structure shown in formula (27) (according to the literature Journal of applied polymer science.1995, Vol.56, 1615-1623 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. Into the flask, add 5.5 g of EDTA aqueous solution with a concentration of 1% by weight, 1.1 g of azobisisobutylamidine hydrochloride aqueous solution with a concentration of 1% by weight, and chain extender N, N'-dimethylethylenediamine 0.066 g, 0.11g of urea, fully stirred to make it evenly mixed. The pH of the system was adjusted to 7.5 with a 1% by weight sodium hydroxide solution. The initial temperature of the system was controlled to 4° C., and after 30 minutes of nitrogen deoxygenation, 1.1 g of ammonium persulfate aqueous solution with a c...

Embodiment 2

[0087] The monomer of the structure shown in the AM of 45.0g, the N-vinylpyrrolidone NVP of 34.2g and the formula (29) of 49.1g (according to document J.Chem.Soc., Perkin Trans.1,2000,2091-2103 Method prepared) joins in the polymerization bottle, adds 495g deionized water, stirs and makes monomer dissolve completely, adds the sodium citrate aqueous solution 5.65g that concentration is 0.1% by weight in the flask respectively, adds the 2 that concentration is 0.1% by weight, 1.13g of 2'-azobis[2-(2-imidazoline-2-propane)-dihydrochloride aqueous solution, add 0.01g of chain extender N,N'-dimethylpropylenediamine, the concentration is 0.1 Add 0.01 g of sodium formate to 1.13 g of the weight % 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...

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Abstract

The invention provides a terpolymer, characterized in that the 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)-(9), and the viscosity-average molecular weight of the 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 a terpolymer, a polymer preparation method and a polymer prepared by the method, and the application of the terpolymer and the polymer as the polymer oil displacement 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 types of reservoirs has been great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/56C08F220/32C08F220/60C08F226/10C09K8/588
Inventor 杜凯刘晓光魏小林
Owner CHINA PETROLEUM & CHEM CORP
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