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Water-soluble hyper-branched polymer oil displacement agent and preparation method thereof

A hyperbranched polymer, water-soluble technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited improvement range, and achieve mild preparation process conditions, enhanced recovery, good water solubility and the effect of thickening performance

Active Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the research on the molecular modification of polyacrylamide, the types of polymers have been enriched and the performance of the product has been improved. However, due to the limitations of linear molecules, the range of improvement is limited.

Method used

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  • Water-soluble hyper-branched polymer oil displacement agent and preparation method thereof
  • Water-soluble hyper-branched polymer oil displacement agent and preparation method thereof
  • Water-soluble hyper-branched polymer oil displacement agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] 25mg parent nucleus HCD, 95mL H 2 O placed in a three-necked flask, stirred and dissolved, passed nitrogen to remove oxygen for 45 minutes, then added an aqueous solution of ceric ammonium nitrate (60 mg of ceric ammonium nitrate dissolved in 10 mL of water) under nitrogen protection, and stirred at 40 ° C for 30 minutes. Slowly add acrylamide aqueous solution (8.0 g of acrylamide dissolved in 22 mL of water), acrylic acid betaine monomer aqueous solution (200 mg of acrylic acid betaine monomer dissolved in 3 mL of water), and then heated to 55 ° C for 6 hours, add 1.2 g NaOH, hydrolyzed at 120°C for 2 hours, and dried to obtain 1# water-soluble hyperbranched polymer.

Embodiment 2

[0053] 30mg parent nucleus HCD, 95mL H 2 O was placed in a three-necked flask, stirred and dissolved, and nitrogen was introduced to remove oxygen for 45 minutes. Then, under nitrogen protection, an aqueous solution of ceric ammonium nitrate (75 mg of ceric ammonium nitrate was dissolved in 10 mL of water) was added, and the reaction was stirred at 40 ° C for 30 minutes. Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), acrylic acid bromoquaternary ammonium salt monomer aqueous solution (400mg acrylic acid bromoquaternary ammonium salt monomer dissolved in 3mL water), then heat up to 55 ℃ for 6 hours, 1.2g of NaOH was added to the reaction solution, hydrolyzed at 120° C. for 2 hours, and dried to obtain 2# water-soluble hyperbranched polymer.

[0054] The polymer performance evaluation method and results provided by the present invention are as follows, wherein the unmodified partially hydrolyzed polyacrylamide (ie "common polymer") is an indust...

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Abstract

The invention provides a water-soluble hyper-branched polymer oil displacement agent and a preparation method thereof. The water-soluble hyper-branched polymer oil displacement agent is composed of a spherical parent nucleus HCD, an acrylamide-sodium acrylate irregular copolymerization chain segment and a poly-amphoteric multi-claw type hydrophobic function chain segment, wherein the acrylamide-sodium acrylate irregular copolymerization chain segment and the poly-amphoteric multi-claw type hydrophobic function chain segment are connected in sequence; the poly-amphoteric multi-claw type hydrophobic function chain segment is formed by polymerizing an acrylic acid glycine betaine monomer or an acrylic acid bromo-quaternary ammonium salt monomer. The preparation process of the water-soluble hyper-branched polymer oil displacement agent is mild in condition, and simple and easy to operate; water-phase free radical polymerization is green and pollution-free, a human body cannot be harmed, products with a series of molecular weights and structures can be obtained, higher water solubility and good tackifying performance can be kept under the high salinity and the strong shearing action, and the water-soluble hyper-branched polymer oil displacement agent can be applied to enhanced oil recovery through the tertiary oil recovery of an oil field.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a water-soluble hyperbranched polymer oil-displacing agent and a preparation method thereof. Background technique [0002] Polymer flooding enhanced oil recovery technology has become one of the important technologies for increasing reserves and production in oilfields, stabilizing oil and controlling water, and field tests and applications have confirmed its technical reliability and economic effectiveness. Once the target reservoir is selected, the polymer used as the oil displacement system becomes the foundation and core of the technology, and the most widely used polymer is partially hydrolyzed polyacrylamide. However, in the process of oil displacement, polyacrylamide polymers often undergo mechanical degradation, thermal degradation, microbial degradation and chemical degradation, resulting in the decrease of solution viscosity and oil displacement efficiency. ...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/34C08B37/16C09K8/588
Inventor 陈文娟张健王洪薛新生唐恩高檀国荣胡科
Owner CHINA NAT OFFSHORE OIL CORP
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