Temperature-resistant water-soluble copolymer, preparation and use thereof

Abstract

The invention discloses a copolymer with temperature resistance and water solubility and the preparation method and application thereof, which is characterized in that: 20 portions of acrylic amide, 0.1 to 10 portions of anion monomer or/and cation monomer, 0.05 to 3 portions of fluorine-containing styrene or/and perfluoroalkyl styrene hydrophobic monomer, 0.5 to 60 portions of surface active agent and 50 to 700 portions of deionized water are put into a three-necked reaction bulb; after the solution pH is regulated to be equal to 2.5 to 9 and N2 is connected for 30 minutes, 0.001 to 0.2 portion of an evocating agent of persulfate is added under temperature of 20 to 70 DEG C, reacting for 6 to 36 hours, and PATF is prepared. Then water is used for diluting so as to prepare PATF concentrated solution, thus obtaining a copolymer that has medium molecular weight and water solubility, is high-temperature resistant, has an ability of molecular association and can be used in high temperature and high salinity reservoir. The copolymer is prepared into aqueous solution with a mass concentration of 0.3 to 3g/L and a surface-active-agent concentration of 0.01 to 4mmol/L, which is put in a blending container with a dasher and is stirred even at room temperature to prepare a polymer oil-displacing agent which is high-temperature resistant, high tackifying and anti-sharing and has excellent aging resistance under high salinity and the temperature of 110 DEG C. The prepared oil-displacing polymer has excellent solution properties owing to the supermolecular structure formed by the association between molecules of fluorine-containing cinnamene or/and alkylbenzene hydrophobic groups, thus having favorable application prospects in high temperature and high salinity reservoir exploitation.

Description

1. Technical field [0001] The invention relates to a temperature-resistant water-soluble copolymer and its preparation method and application, belonging to the fields of polymer materials and enhanced oil recovery. 2. Technical background [0002] With the rapid development of social economy, my country's demand for oil continues to increase. Therefore, it is of great economic and social significance to develop enhanced oil recovery technology to improve the development effect of oil fields and the degree of reserve production. Polymer flooding technology has become one of the important methods to enhance oil recovery because of its simple implementation process and the ability to significantly increase oil recovery. This technology has been applied to large oil fields such as Daqing, Shengli and Dagang in my country, and has won Good economic benefits. [0003] In a reservoir environment with a certain salinity and temperature, the polymer that reaches a certain solution vi...

AI Technical Summary

Problems solved by technology

Compared with ultra-high molecular weight HPAM, this type of polymer has a low molecular weight, does not undergo irreversible mechanical degradation like HPAM, and has excellent shear resistance. However, the temperature resistance of this type of polymer is currently limited, and the temperature is higher than After 55°C, the temperature thickening effect disappears, and the viscosity of the solution decreases significantly with the increase of temperature, and most of the hydrophobic monomers are hydrolyzed after the temperature is higher than 80°C, resulting in the loss of their hydrophobic association function

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