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A temperature-sensitive self-assembled viscosity-increasing dispersion and its preparation method

A technology of self-assembly and dispersion liquid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of slow dissolution rate of polyacrylamide, difficulty in meeting on-site use conditions, poor temperature resistance and salt resistance, and achieve dissolution Fast speed, high viscosity, good temperature resistance

Active Publication Date: 2021-11-30
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the dissolution rate of granular polyacrylamide is slow, and the modified polyacrylamide particles tend to dissolve more slowly, which is difficult to meet the conditions of on-site use; water-in-oil emulsions are limited by the continuous phase, difficult to modify, temperature and resistance Poor salinity; conventional water-in-water type has low effective content and extremely low viscosity, but its dissolution rate is fast and the continuous phase is water phase, which has room for modification

Method used

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  • A temperature-sensitive self-assembled viscosity-increasing dispersion and its preparation method
  • A temperature-sensitive self-assembled viscosity-increasing dispersion and its preparation method
  • A temperature-sensitive self-assembled viscosity-increasing dispersion and its preparation method

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preparation example Construction

[0020] In a first aspect, the present invention relates to a method for preparing a temperature-sensitive self-assembled viscosity-increasing dispersion, the method comprising the steps of:

[0021] (1) Preparation of dispersant: Mix acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, hydrophobic monomer, structure regulator, penetrant and water evenly, and adjust the pH value to 6.8-7.0 (for example 6.9), then add EDTA-2Na and ammonium persulfate and stir evenly, then transfer to the reaction kettle to pass nitrogen to remove oxygen, and then pump sodium bisulfite at 25-28°C (for example, 26 or 27°C) to initiate Polymerization to obtain a dispersant;

[0022] (2) Primary polymerization reaction: acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, thermosensitive monomer, self-assembled monomer, ammonium sulfate, the dispersant prepared in step (1) and Mix the water evenly, adjust the pH value to 6.8-7.0 (for example, 6.9), then add EDTA-2Na and ammonium persulfate and ...

preparation example 1

[0053] Preparation Example 1: Preparation of Dispersant

[0054] The raw materials used in the preparation of the dispersant consist of the following parts by weight: 100 parts by weight of acrylamide; 120 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid; 2 parts by weight of N-tetradecylacrylamide; 0.05 parts by weight of N,N-methylenebisacrylamide; 7 parts by weight of sodium isooctyl alcohol polyoxyethylene ether phosphate; 23 parts by weight of sodium hydroxide; 748 parts by weight of water; 0.03 parts by weight of EDTA-2Na; 0.04 parts by weight; 0.02 parts by weight of sodium bisulfite.

[0055] The preparation process is as follows: acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-tetradecylacrylamide, N,N-methylenebisacrylamide, isooctyl alcohol polyoxyethylene ether phosphate After sodium and water are fully mixed, adjust the pH value to the range of 6.8-7.0 with sodium hydroxide, then add EDTA-2Na and ammonium persulfate, stir for 30 minutes, tran...

Embodiment 1

[0058] The viscosity-increasing dispersion in embodiment 1 is made up of following steps and the raw material of weight part:

[0059] (1) One polymerization reaction

[0060] The raw materials used in a polymerization reaction consist of the following parts by weight: 100 parts by weight of acrylamide, 30 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 10 parts by weight of N,N-dimethylacrylamide, 5 parts by weight of methacryloxyethyl dimethyl octadecyl ammonium bromide, 230 parts by weight of ammonium sulfate, 100 parts by weight of dispersant, 6 parts by weight of sodium hydroxide, 520 parts by weight of water, 0.03 parts by weight of EDTA-2Na, 0.04 parts by weight of ammonium persulfate, and 0.02 parts by weight of sodium bisulfite.

[0061] The preparation process is as follows: acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylacrylamide, methacryloyloxyethyl dimethyl octadecyl ammonium bromide, sulfuric acid After ammonium, dispersant a...

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Abstract

The invention relates to a temperature-sensitive self-assembled viscosity-increasing dispersion liquid and a preparation method thereof, belonging to the technical field of oil and gas field development. The method comprises the steps of: initiating the polymerization of monomers such as acrylamide to prepare a dispersant; using the dispersant to initiate the polymerization reaction of acrylamide, temperature-sensitive monomers and self-assembled monomers step by step in a two-step method; using a suspending agent and a solubilizer for post-treatment to finally obtain the temperature-sensitive self-assembled viscosity-increasing dispersion. The invention also relates to the temperature-sensitive self-assembled viscosity-increasing dispersion prepared by the method. The dispersion has good dispersibility, high content of active ingredients, low apparent viscosity, high molecular weight, good temperature resistance, and salt resistance. Strong, fast dissolution, good stability, within a certain temperature range, the viscosity of the dispersion increases with the increase of temperature, and the viscosity of the dispersion increases with the increase of salinity, especially suitable for high temperature and high salinity conditions Under oil flooding and fracturing stimulation applications.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a temperature-sensitive self-assembled viscosity-increasing dispersion and a preparation method thereof. Background technique [0002] At present, low-permeability oil and gas resources are one of the main exploration and development targets. The burial depth is large, the formation temperature is high, and the salinity of formation water is high. Therefore, additives are required to have excellent temperature and salt resistance properties during oilfield development operations. Polyacrylamide and its derivatives are an important class of water-soluble polymers, which are more and more widely used in oil fields. However, the currently commonly used polyacrylamide and its derivatives still have some defects in their application, such as being extremely sensitive to salt, causing a significant drop in viscosity and poor mechanical shear stability in high-temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F265/10C08F220/56C08F220/54C08F220/34C09K8/588C09K8/68C09K8/88
CPCC08F265/10C09K8/588C09K8/68C09K8/882C08F220/56C08F220/54C08F220/34
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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