Preparation method of star polymer

A star-shaped polymer and monomer technology, which is applied in the field of preparation of star-shaped polymers for movable gel systems in high-temperature and high-salt oil reservoirs, can solve the problems of poor water solubility and low sexual viscosity, and achieve the goal of reducing the polymerization initiation temperature Effect

Active Publication Date: 2011-06-15
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of existing star polymers such as low intrinsic viscosity, poor water solubility, and thickening properties, the invention provides a preparation method for star polymers. The method uses a redox initiation system, and tert-butyl acrylate, 2 -Acrylamido-2-methylpropanesulfonic acid and three water-soluble monomers of acrylamide are subjected to free radical copolymerization in aqueous solution; the redox initiation system is composed of the following components: trimethylolphenol, persulfate, Hydrogen peroxide, urea, sodium formaldehyde sulfoxylate, azobisisobutyronitrile, chain transfer agents and surfactants

Method used

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Embodiment 1

[0024] Weigh 15 grams of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5.56 grams of tert-butyl acrylate (TBA), 15 grams of acrylamide monomer, and an appropriate amount of deionized water to a total liquid volume of 100 grams , added to the ground bottle, stirred and mixed, and prepared into a solution of the required monomer concentration; then 0.005 grams of trimethylolphenol, 0.005 grams of azobisisobutyronitrile, 0.01 grams of urea, and 0.005 grams of formaldehyde. Sodium bisulfate, 0.01 g of disodium edetate and 0.01 g of Span-20 were added to the grinding bottle; the grinding bottle was placed in a constant temperature water bath at 0°C, and after 25 minutes of deoxygenation with nitrogen, 0.005 g of supernatant was added. Add ammonium sulfate and 0.0005 g of hydrogen peroxide aqueous solution, continue to pass nitrogen for 5 minutes, and seal the ground bottle with a latex tube; after standing for 3 hours, raise the temperature of the water bath to 80 ° C, continue ...

Embodiment 2

[0026] Weigh 17 grams of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.56 grams of tert-butyl acrylate (TBA), 15 grams of acrylamide monomer, and an appropriate amount of deionized water to a total liquid volume of 100 grams , added to the ground bottle, stirred and mixed, and prepared into a solution of the required monomer concentration; then 0.005 grams of trimethylolphenol, 0.005 grams of azobisisobutyronitrile, 0.01 grams of urea, and 0.005 grams of formaldehyde. Sodium bisulfate, 0.01 g of disodium edetate and 0.01 g of Span-20 were added to the grinding bottle; the grinding bottle was placed in a constant temperature water bath at 0°C, and after 25 minutes of deoxygenation with nitrogen, 0.005 g of supernatant was added. Add ammonium sulfate and 0.0005 g of hydrogen peroxide aqueous solution, continue to pass nitrogen for 5 minutes, and seal the ground bottle with a latex tube; after standing for 3 hours, raise the temperature of the water bath to 80 ° C, continue ...

Embodiment 3

[0028] Weigh 19 grams of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4.56 grams of tert-butyl acrylate (TBA), 15 grams of acrylamide monomer, and an appropriate amount of deionized water to a total liquid volume of 100 grams , added to the ground bottle, stirred and mixed, and prepared into a solution of the required monomer concentration; then 0.005 grams of trimethylolphenol, 0.005 grams of azobisisobutyronitrile, 0.01 grams of urea, and 0.005 grams of formaldehyde. Sodium bisulfate, 0.01 g of disodium edetate and 0.01 g of Span-20 were added to the grinding bottle; the grinding bottle was placed in a constant temperature water bath at 0°C, and after 25 minutes of deoxygenation with nitrogen, 0.005 g of supernatant was added. Add ammonium sulfate and 0.0005 g of hydrogen peroxide aqueous solution, continue to pass nitrogen for 5 minutes, and seal the ground bottle with a latex tube; after standing for 3 hours, raise the temperature of the water bath to 80 ° C, continue ...

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Abstract

The invention discloses a preparation method of a star polymer, belonging to the technical field of petroleum extraction. The method adopts a redox initiation system, and carries out water solution radical copolymerization on three water-soluble monomers, including tert-butyl acrylate, 2-acrylamido-2-methylpropane sulfonic acid and acrylamide. The redox initiation system comprises trihydroxymethyl phenol, persulfate, hydrogen peroxide, urea, sodium formaldehyde bisulfite, azoisobutyronitrile, chain transfer agent and surfactant. The molecular weight of the star polymer prepared by the method is 8-15 million; the star polymer is water-soluble; the content of the residual monomers in the product is less than or equal to 0.1 wt%; and the star polymer and a crosslinking system, which is composed of water-soluble phenolic resin and polyethylene imine, can form a movable gel system for carrying out deep profile control on a high-temperature high-salt oil reservoir of which the salinity is 117000 mg / L and the temperature is 140 DEG C.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a preparation method of a star-shaped polymer for a movable gel system in high-temperature and high-salt oil reservoirs. Background technique [0002] In recent years, the deep control and flooding technology applied to medium and low temperature reservoirs (below 70°C) has developed rapidly and has been widely used in oilfields. However, the development of deep control and flooding technology for high-temperature reservoirs (above 70°C) is relatively slow, mainly because the development of high-temperature polymers and high-temperature crosslinking agent products is relatively slow and there are relatively few products. At present, there are very few domestic researches on deep profile control and flooding technology under the high temperature condition of 126°C, and the gel system applied under high temperature (80°C-110°C) oilfield conditions is mainly polymer a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F4/40C08F2/38C08F220/58C08F220/18
Inventor 罗文利马德胜樊剑林庆霞韦莉
Owner PETROCHINA CO LTD
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