Acrylamide copolymer, and preparation method and application thereof

An acrylamide-based, copolymer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor fluid loss resistance, limited resistance-reducing performance, and insignificant water-sensitivity effect, etc. Capacitive, high drag reduction rate, simple monomer conversion effect

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the use of guar gum and its derivatives, cellulose and its derivatives as the drag reducing agent in drag reducing water fracturing has improved the pump injection displacement to a certain extent and reduced the frictional resistance in the pipeline (US 5697444, US 5271466 ), but still cannot meet the requirements of drag-reducing water fracturing, mainly due to the following disadvantages of the above-mentioned biopolymers: (1) limited drag-reducing performance; (2) due to guar gum and its derivatives, cellulose and its derivatives A small amount of insoluble matter can easily cause damage to the formation; (3) The dissolution time is long
[0006] In the drag reducing water fracturing construction, acrylamide polymers (partially hydrolyzed polyacrylamide) are mostly used as the drag reducing agent in the drag reducing water fracturing, which greatly increases the pump injection displacement and reduces the flow rate in the pipeline. However, when used as a drag reducing agent for water fracturing in shale gas reservoirs, there are the following important defects: (1) In order to reduce the "water-sensitive effect" in the fracturing process, the clay component in shale is suppressed; Hydration expansion helps the flowback of fracturing fluid to reduce "water plugging". Some alcohol must be added to the fracturing fluid, but the compatibility of partially hydrolyzed polyacrylamide and its emulsion products with alcohol is poor, and precipitation is easy to occur; (2) Partially hydrolyzed polyacrylamide used as a drag reducing agent for drag reducing water fracturing in shale gas reservoirs has poor anti-filtration performance, and this kind of drag reducing water fracturing fluid is very easy to filter out into the formation; (3) The temperature and salt resistance is poor, especially under the conditions of high salinity and high divalent ion content, the molecular structure is unstable, and the drag reduction effect drops rapidly; (4) The traditi

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] This example is used to illustrate the preparation of acrylamide copolymer by the solution polymerization method provided by the present invention.

[0098] At room temperature, 38.38g of acrylamide (AM), 39.65g of M1 monomer represented by formula (37), 4.03g of N,N-dimethylacrylamide (purchased from Sigma-Aldrich Company) and 0.41g The M2 monomer represented by the formula (38) (prepared according to the method of the document Macromolecular Bioscience, 2006, 6(7), 540-554, the same below) was added to the reaction flask, 329.88g of deionized water was added, and stirred to make The monomer is completely dissolved and stirred evenly. 5.4 g of 1% by weight aqueous EDTA solution, 2.0 g of 1% by weight azobisisobutylamidine hydrochloride aqueous solution, and 0.12 g of urea were respectively added to the flask, and stirred well to make them uniform. Use 1% by weight of sodium hydroxide solution to pH 7.4, add 1.1 g of 0.5% by weight of sodium bisulfite solution, control...

Embodiment 2

[0107] This example is used to illustrate the preparation of acrylamide copolymer by the solution polymerization method provided by the present invention.

[0108] At room temperature, add 35.23g of methacrylamide, 72.1g of M3 monomer represented by formula (40), 10.25g of tert-butyl acrylate and 0.01g of M2 monomer represented by formula (38) to the polymerization In the bottle, add 218.38g of deionized water, stir to dissolve the monomer completely, add 7.56g of 1% by weight of EDTA aqueous solution to the flask, add 2.13g of 1% by weight of azobisisobutylamidine hydrochloride aqueous solution, add 0.1% by weight of sodium bisulfite solution 3.2g, add 0.20g of urea, stir well to make it evenly mixed. The initial temperature of the system was controlled to 8°C, and after 30 minutes of nitrogen deoxygenation, 1.0 g of 1% ammonium persulfate aqueous solution was added and nitrogen deoxygenation was continued for 10 minutes. Seal the reactor and keep it at 8°C. After reacting f...

Embodiment 3

[0113] This example is used to illustrate the preparation of acrylamide copolymer by the solution polymerization method provided by the present invention.

[0114] At room temperature, 14.38g of methacrylamide, 11.61g of M4 monomer represented by formula (42), 7.12g of N-tert-butylacrylamide and 0.06g of M2 monomer represented by formula (38) Add it into the reaction bottle, add 77.26g of deionized water, stir to dissolve the monomer completely, and stir evenly. 4.65 g of a 1% by weight aqueous EDTA solution, 1.03 g of a 1% by weight azobisisobutylamidine hydrochloride aqueous solution, and 0.21 g of urea were added to the flask, and stirred well to make them uniform. The pH was adjusted to 7.1 with solid sodium hydroxide. Add 1.1 g of 0.5% by weight sodium bisulfite solution, control the initial temperature of the system to 10°C, pass nitrogen to deoxygenate for 30 minutes, add 1.1 g of 1% by weight ammonium persulfate aqueous solution, and continue to pass nitrogen to remov...

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Abstract

The invention discloses an acrylamide copolymer, and a preparation method and an application thereof. The acrylamide copolymer contains a constitutional unit A, a constitutional unit B, a constitutional unit C and a constitutional unit D, wherein the constitutional unit A is a constitutional unit represented by formula (1) and/or a constitutional unit represented by formula (2), the constitutional unit B is one or more of constitutional units represented by formula (3), formula (4), formula (5) and formula (6) respectively, the constitutional unit C is a constitutional unit represented by formula (7) and/or a constitutional unit represented by formula (8), and the constitutional unit D is a constitutional unit represented by formula (9) and/or a constitutional unit represented by formula (10); and the viscosity average molecular weight of the acrylamide copolymer is 2,000,000-25,000,000. The acrylamide copolymer has the advantages of high drag reduction rate, high heat and salt resistance, good high-shear resistance, good water solubility, good compatibleness with clay inhibitors (alcohol), and small damages to the stratum.

Description

technical field [0001] The invention relates to an acrylamide copolymer and its preparation method and application. Background technique [0002] As a typical representative of the utilization of unconventional oil and gas resources - the exploitation of shale gas (oil) resources has become a revolution in the field of unconventional oil and gas resources in the world. Key technologies. Due to the extremely tight oil and gas reservoirs such as shale gas reservoirs have the characteristics of extremely low permeability (generally less than 0.5mD), high fracturing pressure, and easy formation damage. It must be exploited by "reducing water (slick water) fracturing" technology. [0003] "Slick water (slick water) fracturing" is a type of hydraulic fracturing. Compared with the current conventional fracturing system (modified guar gum cross-linking system), drag-reducing water (slick water) fracturing does not rely on high-viscosity colloid to carry sand, but carries sand wit...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/60C08F220/54C08F220/18C08F220/36C08F4/40C08F4/04C08F2/32C08F2/10C09K8/68
Inventor 杜凯黄凤兴林蔚然
Owner CHINA PETROLEUM & CHEM CORP
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