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Heat-resistant salt-tolerate graft polyacrylamide and preparation method thereof

A technology of polyacrylamide and polyacrylamide oil displacement agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problem of no polyacrylamide products for oil displacement

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These types of polymers have their own characteristics, and some performance indicators are improved compared with traditional polyacrylamides. However, affected by international crude oil prices, mining costs, and synthetic technologies, some are limited to basic laboratory tests. Research
At present, for the three types of oil reservoir resources, under the conditions of formation temperature of 70-95°C and formation salinity of 10,000-30,000mg / L, there are still no mature and commercialized polyacrylamide products for oil displacement

Method used

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  • Heat-resistant salt-tolerate graft polyacrylamide and preparation method thereof
  • Heat-resistant salt-tolerate graft polyacrylamide and preparation method thereof
  • Heat-resistant salt-tolerate graft polyacrylamide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 poly (N-vinylpyrrolidone) acrylamide macromolecular monomer A

[0078] Dissolve 20.0 grams of N-vinylpyrrolidone in 80.0 grams of absolute ethanol, pass through high-purity nitrogen gas for deoxygenation for 20 to 30 minutes, add 1.16 grams of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyrolidinate at 60 At ~70°C, react for 6 hours, add sodium hydroxide solution to adjust the pH value to 8-9, remove most of the solvent under reduced pressure, centrifuge, precipitate in ether three times, and dry to obtain a white solid macromonomer precursor. Its structural formula is shown in formula (2). Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into the three-necked flask, dissolve 5.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add it to the above reaction solution while stirring. The ice-water bath controls the reaction temperature at 0-4 ° C. At the same time, a certain amount of 10% sodium carbona...

Embodiment 2

[0079] Embodiment 2 Poly(N-vinylpyrrolidone) acrylamide type macromonomer B

[0080] Dissolve 20.0 grams of N-vinylpyrrolidone in 80.0 grams of absolute ethanol, pass through high-purity nitrogen gas for deoxygenation for 20 to 30 minutes, add 116 mg of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyrolidinate at 60 At ~70°C, react for 6 hours, add sodium hydroxide solution to adjust the pH value to 8-9, remove most of the solvent under reduced pressure, centrifuge, precipitate in ether three times, and dry to obtain a white solid macromonomer precursor. Its structural formula is shown in formula (2). Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into the three-necked flask, dissolve 2.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add it to the above reaction solution while stirring, and control the reaction temperature at 0-4°C in an ice-water bath. At the same time, a certain amount of 10% sodium carbonate aque...

Embodiment 3

[0081] Embodiment 3 Preparation of temperature-resistant and salt-resistant grafted polyacrylamide oil displacement agent of the present invention

[0082] At room temperature, add 5.10 g of acrylamide, 4.90 g of 2-acrylamido-2-methylpropanesulfonic acid and 1.0 g of poly(N-vinylpyrrolidone) acrylamide type A (Mn=4800) into the polymerization reaction bottle , add 19 grams of water to dissolve, and after 20 minutes of nitrogen deoxygenation, add successively 1.0 grams of 2,2-azobis(2-amidinopropane) dihydrochloride aqueous solution with a mass concentration of 0.025%, and 1.0 grams of an aqueous solution of 0.1% mass concentration. 1.0 grams of ammonium sulfate aqueous solution, 1.0 grams of disodium edetate aqueous solution of mass concentration 0.3%, 1.0 grams of urea aqueous solution of mass concentration 0.6%, 3.7 grams of sodium hydroxide solution of mass concentration 25%, adjust the pH value to 7.5, After continuing to pass nitrogen to remove oxygen for 20 minutes, add ...

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Abstract

The invention belongs to the field of water-soluble flooding polymer study, particularly relates to a high-molecular-weight heat-resistant salt-tolerate graft polyacrylamide synthesized with macromolecule monomer route. The preparation method of the heat-resistant salt-tolerate graft polyacrylamide comprises obtaining poly(N-vinyl pyrrolidone)acrylamide macromolecule monomer through chain transfer free radical polymerization and terminal group replacement; and copolymerizing the macromolecule monomer with acrylamide, N-vinyl pyrrolidone, N,N-dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid or other heat-resistant salt-tolerate monomer in the present of an oxidation-reduction composite initiation system to obtain target product. The invention ensures the heat-resistant salt-tolerate performance of the copolymer from molecular design, and the functional long graft side chain can increase the viscoelasticity of polymer modules and reduce solution surface tension. The inventive product is used for type III oil reservoir, and provides a possible solution for increasing recovery efficiency of chemical flooding.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a temperature-resistant and salt-resistant grafted polyacrylamide and a preparation method thereof. Background technique [0002] Macromonomer refers to a class of linear polymers containing polymerizable units at the end of the molecular chain, and its molecular weight is usually above 1000. The preparation of macromers includes methods such as anionic, cationic and free radical polymerization. The free radical polymerization method is widely used in the preparation of macromonomers due to its wide selection of monomers, simple operation and practicality. This method generally includes two steps. First, the macromonomer precursor is obtained by chain transfer radical polymerization. The chain transfer agent will also purposefully introduce a further reactive monomer at the end of the macromonomer precursor while polymerizing to produce chain transfer. Functional groups (su...

Claims

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Application Information

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IPC IPC(8): C08F271/02C08F220/56C08F220/58C08F220/60C08F220/54C08F226/10C09K8/588
Inventor 伊卓赵方园刘晓光林蔚然计文希魏小林祝纶宇杜凯李勇
Owner CHINA PETROLEUM & CHEM CORP
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