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Acrylamide copolymer, preparation method therefor and applications

An acrylamide-based and acrylamine-based technology is applied in the field of acrylamide-based copolymers and their preparation, which can solve the problems of easy hydrolysis, low drag reduction rate, poor compatibility, etc., and achieve low formation damage, high drag reduction performance, good compatibility

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 current use of polyethylene oxide as a drag reducer for fracturing fluids can reduce the frictional resistance to a certain extent, but the drag reduction rate of polyethylene oxide is unstable under the action of high-speed shearing. Fast and poorly compatible with clay inhibitors (such as KCl) and fungicides (such as formaldehyde)
[0005] In the fracturing process, acrylamide polymers are often used as the drag reducer in the fracturing fluid, which greatly reduces the frictional resistance in the pipeline, but there are still problems of easy hydrolysis, easy degradation, unstable molecular structure, and Defects of poor compatibility of clay inhibitors (such as KCl) and fungicides (such as formaldehyde) and low drag reduction rate

Method used

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  • Acrylamide copolymer, preparation method therefor and applications
  • Acrylamide copolymer, preparation method therefor and applications
  • Acrylamide copolymer, preparation method therefor and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) At room temperature, add 236.4g of water into a 1000mL beaker, and add 110.6g of acrylamide, 36.6g of acrylic acid and 55.6g of polyoxyethylene acrylate represented by formula (15) under mechanical stirring. 0.62g of ammonium persulfate and 0.01g of ethylenediaminetetraacetic acid disodium salt were stirred well to make them uniform, and then 67.8g of 30% NaOH aqueous solution was added to adjust the pH value to 9 to obtain an aqueous phase.

[0054] Formula (15), where p is 113.

[0055](2) In another 1000mL beaker, under mechanical stirring, add 13.8g sorbitan fatty acid ester (Span80, Haian Guoli Chemical Co., Ltd., the same below) and 7.8g polyoxyethylene sorbitan Fatty acid lipid (Tween80, Haian County Guoli Chemical Co., Ltd., the same below), then add 191.6g isoparaffin solvent oil (Isopar M, Shanghai Huishuo Chemical Co., Ltd., the same below), stir well to make it mix evenly, and get the oil phase . Then add the water phase obtained in step (1) into the...

Embodiment 2

[0062] (1) At room temperature, add 114.3g of water into a 1000mL beaker, and add 120.1g of acrylamide, 66.3g of acrylic acid and 50.6g of polyoxyethylene acrylate represented by formula (17) under mechanical stirring. 0.067g of ammonium persulfate, add 0.002g of ethylenediaminetetraacetic acid disodium salt, fully stir to make it uniform, then add 122.7g of 30% NaOH aqueous solution to adjust the pH value to 9 to obtain the water phase,

[0063] Formula (17), where p is 113.

[0064] (2) In another 1000mL beaker, under mechanical stirring, add 10.2g sorbitan fatty acid ester (Span80) and 4g polyoxyethylene sorbitan fatty acid ester (Tween80), and then add 222.8g white Oil (model 3#, Guangzhou Fuchuang Chemical Co., Ltd.), stir well to make the mixture even, and get the oil phase. Then add the water phase obtained in step (1) into the oil phase and emulsify with a high-speed shear dispersing emulsifier for 1 min to obtain a stable milky white inverse emulsion.

[0065] (3)...

Embodiment 3

[0069] (1) At room temperature, add 134.7g of water into a 1000mL beaker, and add 124.1g of acrylamide, 51.4g of acrylic acid and 12.5g of polyoxyethylene acrylate represented by formula (19) under mechanical stirring. Add 0.008 g of ethylenediaminetetraacetic acid disodium salt, and then add 95.1 g of 30% NaOH aqueous solution to adjust the pH value to 8 to obtain an aqueous phase.

[0070] Formula (19), where p is 113.

[0071] (2) In another 1000mL beaker, under mechanical stirring, add 10g sorbitan fatty acid ester (Span80) and 3.6g polyoxyethylene sorbitan fatty acid ester (Tween80), and then add 111.8g iso Naphthalene solvent naphtha (Isopar M), stir well to make it evenly mixed, and get the oil phase. Then add the water phase obtained in step (1) into the oil phase and emulsify with a high-speed shear dispersing emulsifier for 1 min to obtain a stable milky white inverse emulsion.

[0072] (3) After passing high-purity nitrogen gas for 30 minutes under stirring to e...

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Abstract

The invention discloses an acrylamide copolymer, a preparation method therefor and applications. The acrylamide copolymer comprises a structural unit A, a structural unit B and a structural unit C, wherein, the structural unit A is the structural unit shown in the formula (1) and / or the structural unit shown in the formula (2), the structural unit B is the structural unit shown in the formula (3) and / or the structural unit shown in the formula (4), and the structural unit C is the structural unit shown in the formula (5) and / or the structural unit shown in the formula (6). The viscosity-average molecular weight of the acrylamide copolymer is 3000000-20000000. The acrylamide copolymer has good high shear resistance, has good compatibleness with clay inhibitors and bactericides and has high drag reduction efficiency. The formula (1), the formula (2), the formula (3), the formula (4), the formula (5) and the formula (6) are shown in the specification.

Description

technical field [0001] The invention relates to an acrylamide copolymer, a preparation method thereof, and the application of the acrylamide copolymer as a drag reducer. Background technique [0002] Reservoir hydraulic fracturing, referred to as oil reservoir fracturing or fracturing, is a technology developed in the 1940s to modify the seepage characteristics of oil reservoirs, and is an important technological measure for increasing production of oil and gas wells and increasing injection of water injection wells. Fracturing fluid is an important medium in the fracturing process. Commonly used fracturing fluids include water-based fracturing fluid, oil-based fracturing fluid, emulsified fracturing fluid, and foam fracturing fluid. After the fracturing fluid is pressurized by the high-pressure pumping equipment, it is pumped into the formation through the pipe string at high speed. Under the high-pressure and high-speed conditions, the fluid flow in the pipe is severely tu...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F2/32C09K8/68
Inventor 张文龙黄凤兴伊卓杜凯刘希祝纶宇赵方园林蔚然
Owner CHINA PETROLEUM & CHEM CORP
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