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Acrylamide copolymer and preparation method and application thereof

A technology of acrylamide series and copolymers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of polyacrylamide jelly temperature resistance and shear stability, and limitations, and achieve easy-to-obtain raw materials , The preparation method is simple, the effect of good high temperature shear resistance

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the practical application of polyacrylamide jelly system, such as the poor temperature resistance and shear stability of polyacrylamide jelly, so the practical application in oil fields is limited

Method used

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  • Acrylamide copolymer and preparation method and application thereof
  • Acrylamide copolymer and preparation method and application thereof
  • Acrylamide copolymer and preparation method and application thereof

Examples

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preparation example Construction

[0028] The present invention also provides a method for preparing an acrylamide-based copolymer, the preparation method comprising: under the condition of solution polymerization of olefins and in the presence of an initiator, a monomer mixture is polymerized in water, wherein the The monomer mixture contains monomer D, monomer E and monomer F, the monomer D is a monomer with the structure shown in formula (8) and / or formula (9), and the monomer E is a monomer with the formula ( 10) and / or a monomer with a structure shown in formula (11), the monomer F is a monomer with a structure shown in formula (12) and / or formula (13); and the monomer F in the monomer mixture The total number of moles of the monomer is based on the content of the monomer D is 5-25 mole %, the content of the monomer E is 60-90 mole %, and the content of the monomer F is 0.01-30 mole %; Preferably, the content of the monomer D is 10-20 mol%, the content of the monomer E is 70-85 mol%, and the content of the...

Embodiment 1

[0052] This example is used to illustrate the acrylamide copolymer and its preparation method.

[0053] Under cooling conditions at 0°C, 23.76 g of acrylamide (AM), 4.83 g of N-methylolacrylamide (N-MAM) and 16.35 g of 3-acrylamide-3- Methyl butyric acid (AMBA), add 180g of water, stir to dissolve the monomer completely, and obtain the aqueous solution of the monomer mixture. The pH was adjusted to 5.5 with sodium hydroxide solution. Pass N 2 After bubbling for 30 minutes, add 0.012g of 2,2'-azobis(2-amidinopropane) dihydrochloride (V50), 0.004g of ammonium persulfate (APS), 0.0025g of sodium bisulfite, The reaction mixture was prepolymerized at 20° C. for 1 hour, and then the reaction mixture was heated to 60° C. for 2 hours. The colorless transparent viscoelastic colloid P1 of the acrylamide-based copolymer was obtained by discharging the material. The properties of P1 were measured after granulation, drying, crushing and sieving. The measurement results are shown in Tabl...

Embodiment 2

[0061] This example is used to illustrate the acrylamide copolymer and its preparation method.

[0062] Under the condition of cooling at 0°C, 33.68g of acrylamide, 5.64g of N-methylolacrylamide and 4.77g of 3-acrylamide-3-methylbutanoic acid were successively added to a 250mL reactor, and 96.7g water, stirring to completely dissolve the monomers to obtain an aqueous solution of the monomer mixture. Adjust the pH to 8.5 with sodium hydroxide solution. Pass N 2 After bubbling for 30 minutes, 0.01 g of 2,2'-azobis(2-amidinopropane) dihydrochloride, 0.006 g of ammonium persulfate (APS) and 0.0028 g of sodium bisulfite were sequentially added to make the reaction mixture The reaction was carried out at 8° C. for 3 hours, and then the reaction mixture was heated to 70° C. for 1 hour. The colorless transparent viscoelastic colloid P2 of the acrylamide-based copolymer was obtained by discharging the material. After the P2 was granulated, dried, pulverized and sieved, various prope...

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Abstract

The invention discloses an acrylamide copolymer and its preparation method and application. The acrylamide copolymer contains a structural unit A, a structural unit B and a structural unit C. the structural unit A is a unit with a structure as shown in the formula (1) and / or the formula (2); the structural unit B is a unit with a structure as shown in the formula (3) and / or the formula (4); and the structural unit C is a unit with a structure as shown in the formula (5) and / or the formula (6). In addition, with the total mole number of the structural units in the acrylamide copolymer as the reference, the structural unit A accounts for 5-25 mol%, the structural unit A accounts for 60-90 mol%, and the structural unit C accounts for 1-30 mol%. Viscosity-average molecular weight of the acrylamide copolymer is 1-10 million. The acrylamide copolymer has excellent thickening performance under conditions of high temperature and high salinity, and gel formed after crosslinking has good shearing resistance.

Description

technical field [0001] The present invention relates to an acrylamide copolymer, a preparation method of the acrylamide copolymer, an acrylamide copolymer prepared by the method, and an application of the acrylamide copolymer as a fracturing fluid thickener . Background technique [0002] As the world's energy development focus shifts to unconventional oil and gas resources, hydraulic fracturing technology, as a key technology for the development of unconventional resources such as tight sandstone oil and gas, coalbed methane and shale oil and gas, has been highly valued. The low-damage, low-cost water-based fracturing fluid system has become a research and development hotspot as a key link to ensure the success of fracturing construction and increase production efficiency. Major international oil companies have invested a lot of manpower and material resources in the research and development of new fracturing fluid systems. Field Test. [0003] Water-based fracturing flui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C09K8/68
Inventor 林蔚然伊卓赵方园张文龙方昭杜超刘希祝纶宇
Owner CHINA PETROLEUM & CHEM CORP
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