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A kind of preparation method of polyacrylamide used in polymer flooding oil recovery
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A technology of polyacrylamide and acrylamide, which is applied in the field of polymers and can solve the problems of poor viscosity-increasing effect of polyacrylamide
Active Publication Date: 2018-11-27
山东东方盛嘉石油科技有限责任公司
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[0004] The purpose of the present invention is to solve the problem that ultra-high molecular weight polyacrylamide has a poor viscosity-increasing effect in high-salt reinjection water. By modifying polyacrylamide, it can be used in oil fieldpolymer flooding and reinjection water. Can improve oil recovery efficiency
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Embodiment 1
[0018] Step 1, mix 5g of methacryloxyethyltrimethylammonium chloride, 120g of acrylamide, 5g of trimethylolmethylamine, 5g of sodium cetylbenzenesulfonate and 1000g of water, and then mix Nitrogen is fed into the solution, and the time of feeding nitrogen is 10 minutes;
[0019] Step 2: Add 0.5 g of initiator ammoniumpersulfate to the mixture obtained in step 1, raise the temperature to 50°C, keep the reaction for 10 minutes, and cool down to 5°C at a rate of 5°C / min;
[0020] Step 3: Add 10g of hydroxyethyl acrylate and 5g of dimethylchlorosilane to the mixture obtained in step 2, then adjust the pH of the reaction system to 9-10, raise the temperature to 60°C, and keep the reaction for 2 hours , after the end, take out the obtained jelly product, cut, dry, granulate, and sieve to obtain polyacrylamide product.
Embodiment 2
[0022] Step 1, mix 10g of methacryloyloxyethyltrimethylammonium chloride, 200g of acrylamide, 10g of trimethylolmethylamine, 10g of sodium cetylbenzenesulfonate and 4000g of water, and then mix Nitrogen is passed into the solution, and the time of feeding nitrogen is 60 minutes;
[0023] Step 2: Add 1 g of initiator ammoniumpersulfate to the mixture obtained in step 1, raise the temperature to 70°C, keep the reaction for 20 minutes, and cool down to 10°C at a rate of 5°C / min;
[0024] Step 3: Add 15g of hydroxyethyl acrylate and 10g of dimethylchlorosilane to the mixture obtained in step 2, then adjust the pH of the reaction system to 9-10, raise the temperature to 80°C, and keep the reaction for 4 hours , after the end, take out the obtained jelly product, cut, dry, granulate, and sieve to obtain polyacrylamide product.
Embodiment 3
[0026] Step 1, mix 7g of methacryloxyethyltrimethylammonium chloride, 150g of acrylamide, 8g of trimethylolmethylamine, 8g of sodium cetylbenzenesulfonate and 2000g of water, and then mix Nitrogen is passed into the solution, and the time of feeding nitrogen is 30 minutes;
[0027] Step 2: Add 0.7 g of initiator ammoniumpersulfate to the mixture obtained in step 1, raise the temperature to 60°C, keep the reaction for 15 minutes, and cool down to 6°C at a rate of 5°C / min;
[0028] Step 3: Add 12g of hydroxyethyl acrylate and 7g of dimethylchlorosilane to the mixture obtained in step 2, then adjust the pH of the reaction system to 9-10, raise the temperature to 70°C, and keep the reaction for 3 hours , after the end, take out the obtained jelly product, cut, dry, granulate, and sieve to obtain polyacrylamide product.
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Abstract
The invention discloses a preparation method of polyacrylamide for polymer-flooding oil extraction and belongs to the technical field of macromolecules. The preparation method comprises steps as follows: a cationic monomer, acrylamide, trihydroxymethyl aminomethane, a surfactant and water are uniformly mixed, and then nitrogen gas is introduced into the mixed solution; an initiator is added, the mixed solution is heated, has a reaction at a constant temperature and then is cooled, hydroxyethyl acrylate and dimethylchlorosilane are added to the mixture, pH of the reaction system is adjusted, then the mixture is heated and reacts at a constant temperature, an obtained colloidal product is taken out after the reaction ends, and a polyacrylamide product is obtained through cutting, drying, pelletizing and screening. The monomerreaction sequence of modified polyacrylamide is adjusted during polymerization, the cationic monomer and acrylamide have a partial polymerization reaction, then hydroxyethyl acrylate and dimethylchlorosilane continue to have a polymerization reaction, and the prepared modified polyacrylamide has the effect of increasing viscosity of a solution with a high ionic concentration.
Description
technical field [0001] The invention discloses a preparation method of polyacrylamide used for polymer flooding and recovery, and belongs to the technical field of polymers. Background technique [0002] my country's oil consumption has grown rapidly, becoming the world's third largest oil consumer, and its dependence on oil imports has risen rapidly, exceeding 50% in 2009. As a non-renewable energy source, petroleum has very limited underground reserves. Under the current water flooding conditions, the oil recovery rate is only 35% to 45%, that is to say, most of the crude oil remains underground after the water flooding ends. How to maximize the remaining underground crude oil has become an important task in the petroleum industry. "Developing the west and stabilizing the east" is the development strategy of my country's petroleum industry. Improving the underground crude oilrecovery rate in the late stage of high water cut in the east oilfield is an important part of s...
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