Viscoelastic polymer emulsion and preparation method thereof, low-viscosity slippery water and high-viscosity sand-carrying liquid

A polymer emulsion, viscoelastic technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, drilling compositions, etc., can solve the problems of low copolymerization rate, etc. The effect of associating and relieving environmental pressure

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a viscoelastic polymer emulsion and a preparation method thereof. Nanoscale viscoelastic polymer emulsions capable of real-time pumping are prepared by inverse emulsion polymerization, which overcomes the problems of existing associations and monomers in the process of inverse emulsion polymerization. Disadvantages of low copolymerization rate

Method used

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  • Viscoelastic polymer emulsion and preparation method thereof, low-viscosity slippery water and high-viscosity sand-carrying liquid
  • Viscoelastic polymer emulsion and preparation method thereof, low-viscosity slippery water and high-viscosity sand-carrying liquid
  • Viscoelastic polymer emulsion and preparation method thereof, low-viscosity slippery water and high-viscosity sand-carrying liquid

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preparation example Construction

[0037] A preparation method of viscoelastic polymer emulsion, comprising the following steps:

[0038] Step 1. In the jacketed reactor, add 30 to 47 parts of 3# white oil and 0.3 to 1 part of emulsifier in parts by mass, and start stirring to obtain the oil phase;

[0039] The emulsifier is Sorbitan oleate Span80, Sorbitan trioleate Span85, polyoxyethylene sorbitan monooleate Tween80, polyethylene glycol (400) dioleate polyDOPEG400 At least one of the emulsifiers is added in an amount of 10-20% of the total mass of the emulsion.

[0040] Step 2. In parts by mass, add 27 to 30 parts of the aqueous phase reaction monomer into the jacketed reactor, use 0.3 to 0.4 parts of 30% sodium hydroxide solution to adjust the pH to 5.5-6.8, and control the temperature to ≤20°C. Add 0.025 to 0.05 parts of oxidizing initiator and 0.04 to 0.06 part of co-initiator to obtain an aqueous phase;

[0041] The water-phase reaction monomer is a mixture of acrylamide, acrylic acid, 2-acrylamide-2-me...

Embodiment 1

[0053] A preparation method of viscoelastic polymer emulsion, comprising the following steps:

[0054] Step 1. In the jacketed reactor, add 30 parts of 3# white oil and 0.3 parts of sorbitan oleate Span80 in parts by mass, and start stirring to obtain the oil phase;

[0055] Step 2. In parts by mass, add 27 to 30 parts of water-phase reaction monomers into the jacketed reactor, use 0.3 parts of 30% sodium hydroxide solution to adjust the pH to 5.5-6.8, control the temperature to ≤20°C, and add 0.025 Part of potassium sulfate and 0.04 part of azobisisobutyl cyanide to obtain an aqueous phase;

[0056] The aqueous phase reaction monomer is a mixture of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-allyl and N-alkyl amino acids, and the mass ratio is 100:10:10: 5.

[0057] Step 3. Press 52 parts of the water phase and 30 parts of the oil phase into the reaction kettle by mass parts, start stirring and emulsify with nitrogen for 30 minutes, and the tempe...

Embodiment 2

[0062] A preparation method of viscoelastic polymer emulsion, comprising the following steps:

[0063] Step 1. In the jacketed reactor, add 40 parts of 3# white oil and 0.6 part of sorbitan trioleate Span85 in parts by mass, and start stirring to obtain the oil phase;

[0064] Step 2. In parts by mass, add 28 parts of water-phase reaction monomers into the jacketed reactor, use 0.35 parts of 30% sodium hydroxide solution to adjust the pH to 5.5-6.8, control the temperature to ≤20°C, and add 0.35 parts of sulfuric acid Potassium and 0.5 part of azobisisobutyl cyanide to obtain an aqueous phase;

[0065] Described aqueous phase reaction monomer is the mixture of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-allyl and N-alkyl amino acid, and the mass ratio is 100:25:15: 8.

[0066] Step 3. Press 60 parts of the water phase and 40 parts of the oil phase into the reaction kettle by mass parts, start stirring and nitrogen emulsification for 30 minutes, and...

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Abstract

The invention provides a viscoelastic polymer emulsion and its preparation method, low-viscosity slippery water and high-viscosity sand-carrying fluid. Molecular emulsion, which overcomes the disadvantage of low copolymerization rate of existing alkene and monomers in the process of inverse emulsion polymerization, by introducing N-allyl and N-alkyl amino acid functional alkene and monomers, the pH is controlled at its isoelectric point Within the range, the association monomer has a weaker hydrophilicity, and at the same time reduces its surfactant, which minimizes the impact on the HLB of the emulsification system. At the same time, most of it can be dissolved in the water phase, thereby effectively increasing the copolymerization rate. Finally, the association effect is enhanced.

Description

technical field [0001] The invention relates to the technical field of recyclable fracturing fluid in oil and gas fields, in particular to a viscoelastic polymer emulsion, a preparation method thereof and a fracturing fluid. Background technique [0002] As the viscosity of fracturing fluid increases, the length of fractures produced by fracturing gradually decreases, while the width of fractures gradually increases. Low-viscosity fracturing fluid is beneficial to control the width of fracturing fractures, extend the length of fractures, and obtain better reservoir and wellbore seepage channel. However, the lower the viscosity of conventional fracturing fluid, the faster its sand-carrying performance will decline. In order to obtain a good fracturing effect, the contradiction between viscosity and sand-carrying performance must be overcome, and low-viscosity sand-carrying can be achieved by improving the elasticity of the fracturing fluid and increasing the structural visco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F2/32C09K8/68C09K8/88B82Y30/00B82Y40/00
CPCC08F220/56C08F2/32C09K8/68C09K8/882B82Y30/00B82Y40/00C08F220/06C08F220/585C08F226/02
Inventor 孟磊李宪文丁里张燕明石华强刘晓瑞李小玲祖凯王历历傅鹏
Owner PETROCHINA CO LTD
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