High-temperature-resistant thickening agent for fracturing fluid, and preparation method and application thereof

A thickening agent and anti-high temperature technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting oil recovery efficiency, ineffective application, and affecting the performance of fracturing fluid, so as to increase the physical exchange rate. Joint point, easy operation and use, good solubility effect

Inactive Publication Date: 2020-04-17
四川盛年同缔实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing thickeners for fracturing fluids cannot be effectively applied at high temperatures, which in turn will affect the performance of fracturing fluids, and finally affect

Method used

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  • High-temperature-resistant thickening agent for fracturing fluid, and preparation method and application thereof
  • High-temperature-resistant thickening agent for fracturing fluid, and preparation method and application thereof
  • High-temperature-resistant thickening agent for fracturing fluid, and preparation method and application thereof

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Effect test

Embodiment 1

[0030] The present invention is a kind of anti-high temperature thickener for fracturing fluid and its preparation method and application, comprising selecting AM, NVP, sodium acrylate and diacetone acrylamide as comonomers, and the molar feeding ratio of the four monomers is AM:NVP : sodium acrylate: diacetone acrylamide = 1:0.05:0.03:0.05. First, the monomer is added into water and stirred until it is completely dissolved, and an aqueous solution system with a monomer concentration of 20 wt % is prepared. Then add the molecular weight regulator isopropanol, the addition accounts for 0.002% of the total mass of the monomers. Adjust the pH value of the system to 6.8, adjust the initiation temperature to 24°C, add initiator hydrogen peroxide and ferrous sulfate (each accounting for 0.02% of the total monomer mass) to initiate polymerization, and the solution begins to become viscous; continue the reaction when the reaction system reaches the highest temperature After 2h, a pol...

Embodiment 2

[0032] Select AM, NVCL, sodium styrene sulfonate and nonyl alcohol polyoxyethylene ether (12) acrylate as comonomers, and the feeding ratio of the four monomers is AM: NVCL: sodium styrene sulfonate: nonyl alcohol polyoxyethylene Oxyethylene ether (12) acrylate = 1:0.03:0.01:0.06. Firstly, the monomer is added into water and stirred until it is completely dissolved, and an aqueous solution system with a monomer concentration of 27% by weight is prepared. Then add the molecular weight regulator isopropanol, the addition accounts for 0.001% of the total mass of the monomers. Adjust the pH value of the system to 7.2, adjust the initiation temperature to 18°C, add initiators ammonium persulfate and sodium bisulfite (each accounting for 0.014% of the total monomer mass) to initiate polymerization, and the solution begins to become viscous; when the reaction system reaches the highest temperature Afterwards, the reaction was continued for 1 h to obtain a polymer gel, and the reacti...

Embodiment 3

[0034] Select AM, sodium 2-acrylamide-2-methylpropanesulfonate, sodium acrylate and dimethylaminoethyl methacrylate as comonomers, and the feeding ratio of the four monomers is AM: 2-acrylamide-2- Sodium methylpropanesulfonate: sodium acrylate: dimethylaminoethyl methacrylate=1:0.02:0.02:0.08. First, the monomer is added into water and stirred until it is completely dissolved to prepare an aqueous solution system with a monomer concentration of 25 wt%. Then add the molecular weight regulator isopropanol, the addition accounts for 0.001% of the total mass of the monomers. Adjust the pH value of the system to 7.5, adjust the initiation temperature to 10° C., add initiators 2,5-dihexylbishydroperoxide and sodium bisulfite (each accounting for 0.011% of the total monomer mass) to initiate polymerization, and the solution begins to become viscous; When the reaction system was raised to the highest temperature, the reaction was continued for 1.5 h to obtain a polymer gel, and the r...

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Abstract

The invention discloses a high-temperature-resistant thickening agent for a fracturing fluid, and a preparation method and an application thereof. The high-temperature-resistant thickening agent for the fracturing fluid and is characterized in that the thickening agent comprises acrylamide, a salt-resistant functional monomer and a temperature-sensitive functional monomer free radical; and the molar ratio of the acrylamide to the salt-resistant functional monomer to the temperature-sensitive functional monomer is 1:(0.01-0.08):(0.05-0.15). A temperature-sensitive unit and a salt-resistant unitare introduced into an acrylamide molecular chain in a solution copolymerization mode, so that the copolymer is endowed with excellent high-temperature resistance and salt resistance and also has good solubility, viscoelasticity and sand carrying property.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to a high-temperature-resistant thickener for fracturing fluid, a preparation method and application thereof. Background technique [0002] In recent years, with the development of the world economy, the demand for oil in various countries has been increasing. At the same time, the degree of exploitation continues to increase, and the difficulty of global oil extraction is gradually increasing. Therefore, fracturing, as a production-increasing technology for oil extraction, has received more and more attention. The purpose of fracturing is to maximize the conductivity of the reservoir to achieve the purpose of increasing oil and gas production. The fracturing fluid used in fracturing is required to have the characteristics of high viscosity, high shear resistance, excellent sand-carrying ability, no residue in gel breaking, little damage to the formation, and environmental prote...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F226/10C08F220/06C08F220/58C08F283/06C09K8/68
CPCC08F220/56C08F283/065C09K8/685C09K8/887C08F226/10C08F220/06C08F220/58
Inventor 罗杨张建文徐兴海
Owner 四川盛年同缔实业有限公司
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