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Preparation method of low-temperature anti-freezing emulsion polymer thickening agent for fracturing

An emulsion polymer, thickener technology, used in chemical instruments and methods, drilling compositions, etc.

Active Publication Date: 2022-05-31
SNF CHINA FLOCCULANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In CN 111675790 A, a freeze-thaw resistant polymer emulsion and its preparation method are disclosed. Although it can withstand multiple freeze-thaw cycles in the actual environment, it cannot fundamentally solve the problem of maintaining the fluidity of the emulsion polymer body under low temperature and severe cold conditions. liquid state

Method used

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  • Preparation method of low-temperature anti-freezing emulsion polymer thickening agent for fracturing
  • Preparation method of low-temperature anti-freezing emulsion polymer thickening agent for fracturing
  • Preparation method of low-temperature anti-freezing emulsion polymer thickening agent for fracturing

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Effect test

Embodiment 1

[0031] The invention provides a low-temperature antifreeze polymer emulsion thickener for fracturing, the preparation method of which is:

[0032] S1. Preparation of water phase: 20 parts by mass of acrylamide, 14 parts of acrylic acid, 5 parts of salt-resistant monomer 2-acrylamido-2-methylpropanesulfonate sodium, 0.002 parts of chain transfer agent sodium formate, chelate 0.04 part of pentasodium diethylenetriaminepentaacetic acid mixture, 0.001 part of water-soluble oxidant tert-butyl hydroperoxide, adjust the pH value to 6.2-6.5 with 9.5 parts of ammonia water, finally add 10 parts of distilled water, mix well to obtain an aqueous phase solution;

[0033] S2. Preparation of the oil phase: In the reaction kettle, according to the mass fraction ratio, 9 parts of mineral oil Exxsol D80, 17 parts of naphthenic white oil, 1.8 parts of emulsifier PEG-30 dipolyhydroxystearate, PPG-6- 0.9 parts of decyltetradeceth-12, and finally add 0.03 parts of oil-soluble initiator azobisisobu...

Embodiment 2

[0038] S1. Preparation of water phase: 15 parts by mass of acrylamide, 20 parts of acrylic acid, 6 parts of salt-resistant monomer 2-acrylamido-2-methylpropanesulfonate sodium, 0.002 parts of chain transfer agent sodium formate, chelate 0.04 part of pentasodium diethylenetriaminepentaacetic acid mixture, 0.001 part of water-soluble oxidant tert-butyl hydroperoxide, adjust the pH value to 6.2-6.5 with 12 parts of ammonia water, and finally add 7 parts of distilled water, mix well to obtain an aqueous phase solution;

[0039] S2. Preparation of the oil phase: In the reaction kettle, according to the mass fraction ratio, 9 parts of mineral oil Exxsol D80, 17 parts of naphthenic white oil, 1.7 parts of emulsifier PEG-30 dipolyhydroxystearate, PPG-6- 1.0 parts of decyltetradeceth-12, and finally add 0.03 parts of oil-soluble initiator azobisisobutyronitrile, and mix well to obtain a yellow transparent oil phase;

[0040] S3. Emulsification and homogeneity: the preparation process i...

Embodiment 3

[0044] The invention provides a low-temperature antifreeze polymer emulsion thickener for fracturing, the preparation method of which is:

[0045] S1. Preparation of water phase: in parts by mass, 13 parts of acrylamide, 15 parts of acrylic acid, 6 parts of salt-resistant monomer 2-acrylamido-2-methylpropanesulfonate sodium, 0.002 parts of chain transfer agent sodium formate, chelate 0.04 part of pentasodium diethylenetriaminepentaacetic acid mixture, 0.001 part of water-soluble oxidant tert-butyl hydroperoxide, adjust the pH value to 6.2-6.5 with 10.2 parts of ammonia water, finally add 10 parts of distilled water, mix well to obtain an aqueous phase solution;

[0046] S2. Preparation of the oil phase: In the reaction kettle, according to the mass fraction ratio, 9 parts of mineral oil Exxsol D80, 17 parts of naphthenic white oil, 2.0 parts of emulsifier PEG-30 dipolyhydroxystearate, PPG-6- Decyl tetradeceth-12 0.8 parts of emulsifier, finally add 0.03 parts of oil-soluble in...

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Abstract

The invention relates to a preparation method of a low-temperature anti-freezing emulsion type polymer thickening agent for fracturing. The preparation method comprises the following steps: uniformly stirring acrylamide, acrylic acid, an anti-salt monomer, deionized water, a chain transfer agent, a chelating agent, a water-soluble oxidizing agent and ammonia water in a mixing container in parts by mass, and adjusting the pH value; the oil phase is a transparent oil phase formed by fully mixing a compound solvent mineral oil and a compound nonionic emulsifier in a reaction kettle; adding the water phase into the oil phase, emulsifying and homogenizing, fully replacing with inert gas to remove oxygen, adding a reducing agent for polymerization reaction, and performing phase inversion with a phase inversion agent to obtain the polymer emulsion. The thickening agent disclosed by the invention is good in stability at a low temperature, an emulsion polymer can be kept in a homogeneous liquid state with relatively good flowability after being placed at-25 DEG C for 30 days, and the problems that an emulsion type thickening agent for fracturing is easy to layer, agglomerate, precipitate and solidify when being stored in the open air at a low temperature are solved; the construction problems of on-site storage, pumping, dissolution and the like in northwest and northeast oil and gas fields in severe cold weather in winter are solved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical fracturing fluid, in particular to a low-temperature antifreeze emulsion-type polymer thickener for fracturing and a preparation method thereof. Background technique [0002] With my country's accumulation of years of experience in oil and gas exploration and exploitation technology, the level of oil field drilling and fracturing technology has improved by leaps and bounds in recent years. More at ease. Especially in the Northwest and Northeast, which are located in the main distribution area of ​​the oil field, the autumn and winter seasons are very cold, and the extreme on-site temperature is even as low as -20°C. Under such harsh construction conditions, as a fracturing fluid thickener, acrylamide polymer emulsions are prone to stratification at the top and precipitation at the bottom at low temperatures (<-10°C), and the sharp increase in viscosity causes pump transmission obstacl...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F2/30C09K8/68
CPCC08F220/56C08F220/06C08F2/30C09K8/68C09K8/882C08F220/585
Inventor 金龙哲徐青林凌静朱亮
Owner SNF CHINA FLOCCULANT
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