Acrylamide copolymer and preparation method and application thereof

An acrylamide-based and acrylamine-based technology, applied in the field of acrylamide-based copolymers and its preparation, can solve problems such as low drag reduction rate, poor compatibility, and increased formation damage, and achieve high drag reduction rate, good Compatibility, formation damage low effect

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the good flexibility of polyethylene oxide, the use of polyethylene oxide as the drag reducing agent of fracturing fluid can reduce the frictional resistance to a certain extent, but the drag reduction rate of polyethylene oxide is not stable under the action of high-speed shearing, and drops sharply. Fast, and less compatible with clay inhibitors (such as KCl) and fungicides (such as formaldehyde)
[0005] In the fracturing process, acrylamide and acrylic acid polymers are often used as drag reducers in fracturing fluids, which greatly reduce the friction resistance in pipelines, but such polymers still exist due to the action of calcium ions. Defects of easy flocculation, unstable molecular structure, poor compatibility with clay inhibitors (such as KCl) and fungicides (such as formaldehyde) and low drag reduction rate under high temperature and high shear conditions, in addition, the appearance of flocs will Cause reservoir fracturing fractures to be blocked, and the damage to the formation will increase

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

[0059] (1) At room temperature, in a 1000mL beaker, add 520.8g of water, and under mechanical stirring, add 103.6g of acrylamide and 119.6g of sodium hydroxypropyl methacrylate represented by formula (11), respectively, 0.27g of ammonium persulfate, 0.02g of chelating agent ethylenediaminetetraacetic acid disodium salt was added, fully stirred to make it uniform, then 30% by weight of NaOH aqueous solution was added to adjust the pH to 6 to obtain an aqueous phase,

[0060] Formula (11).

[0061] (2) In another 1000mL beaker, under mechanical stirring, add 23.9g sorbitan fatty acid ester (Span80, Haian County Guoli Chemical Co., Ltd., the same below) and 13.3g polyoxyethylene sorbitan fatty acid respectively grease (Tween80, Haian Guoli Chemical Co., Ltd., the same below), then 260.5 g of isoparaffin solvent oil (Isopar M, Shanghai Huishuo Chemical Co., Ltd., the same below) was added, and it was fully stirred to mix uniformly to obtain an oil phase. Then, the water phase o...

Embodiment 2

[0068] (1) At room temperature, in a 1000mL beaker, add 163.6g of water, and under mechanical stirring, add 100.7g of acrylamide and 99.3g of sodium hydroxypropyl methacrylate represented by formula (11), respectively, 0.062g of ammonium persulfate was added to 0.012g of chelating agent ethylenediaminetetraacetic acid disodium salt, fully stirred to make it uniform, and then 30% by weight of NaOH aqueous solution was added to adjust the pH to 9 to obtain an aqueous phase.

[0069] (2) In another 1000mL beaker, under mechanical stirring, add 8.7g of sorbitan fatty acid ester (Span80) and 1.1g of polyoxyethylene sorbitan fatty acid ester (Tween80), and then add 172g of isomerized Paraffin solvent oil (Isopar M), stir well to make it evenly mixed to obtain an oil phase. Then, the water phase obtained in step (1) is added to the oil phase, and emulsified with a high-speed shearing dispersing emulsifier for 1 min to obtain a stable milky white inverse emulsion.

[0070] (3) After ...

Embodiment 3

[0073] (1) At room temperature, in a 1000mL beaker, add 301.7g of water, and under mechanical stirring, add 107.9g of acrylamide and 93.2g of sodium hydroxypropyl methacrylate represented by formula (11), respectively, 0.019g of chelating agent ethylenediaminetetraacetic acid disodium salt was added, fully stirred to make it uniform, and then 30% by weight of NaOH aqueous solution was added to adjust the pH to 7 to obtain an aqueous phase.

[0074] (2) In another 1000mL beaker, under mechanical stirring, add 11.3g of sorbitan fatty acid ester (Span80) and 8.8g of polyoxyethylene sorbitan fatty acid ester (Tween80), and then add 281.6g of isosorbide paraffinic solvent oil (Isopar M), stir well to make it evenly mixed to obtain an oil phase. Then, the water phase obtained in step (1) is added to the oil phase, and emulsified with a high-speed shearing dispersing emulsifier for 1 min to obtain a stable milky white inverse emulsion.

[0075] (3) Under stirring, high-purity nitrog...

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Abstract

The invention discloses an acrylamide copolymer and a preparation method and application thereof. The acrylamide copolymer contains a structural unit A and a structural unit B, wherein the structural unit A is a structural unit shown as a formula (1) and/or a structural unit shown as a formula (2); the structural unit B is a structural unit shown as a formula (3) and/or a formula (4); the viscosity-average molecular weight of the acrylamide copolymer is 4,000,000-20,000,000. The acrylamide copolymer provided by the invention has high drag reduction efficiency, high shear resistance, high salt tolerance and high compatibility with clay inhibitors and bactericides. The formula (1), the formula (2), the formula (3) and the formula (4) are shown in the specification.

Description

technical field [0001] The invention relates to an acrylamide-based copolymer and a preparation method thereof, and the application of the acrylamide-based copolymer as a drag reducing agent. Background technique [0002] Oil layer hydraulic fracturing, referred to as oil layer fracturing or fracturing, is a process technology developed in the 1940s to improve the seepage characteristics of oil layers. Fracturing fluid is an important medium in the fracturing process. Commonly used fracturing fluids include water-based fracturing fluid, oil-based fracturing fluid, emulsion fracturing fluid, foam fracturing fluid, etc. After the fracturing fluid is pressurized by the high-pressure pumping equipment, it is pumped into the formation at high speed through the pipe string. Under the condition of high pressure and high speed, the turbulent flow of the fluid in the pipe is serious, and there is a large frictional resistance between the fracturing fluid and the pipe wall. The frict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/38C08F2/32C09K8/68
Inventor 张文龙黄凤兴伊卓刘希杜凯祝纶宇林蔚然赵方园
Owner CHINA PETROLEUM & CHEM CORP
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