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Instant polyacrylamide and preparation method thereof

A polyacrylamide, instant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as short curing time, and achieve the effects of good solubility, uniform chain growth, and improved initiation efficiency.

Active Publication Date: 2015-11-25
华鼎鸿基采油技术服务(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the dissolution time of the existing polyacrylamide is basically between 1 and 2 hours, which is suitable for onshore oil fields, but for the characteristics of simple polymer dispensing equipment and short polymer curing time in offshore oil fields, it is generally required to polymerize The dissolution time of the substance is within 30 minutes, and the existing polyacrylamide is difficult to meet this requirement

Method used

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  • Instant polyacrylamide and preparation method thereof
  • Instant polyacrylamide and preparation method thereof
  • Instant polyacrylamide and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a preparation method of the above-mentioned instant polyacrylamide, comprising: A) in the presence of a redox initiator system and an azo initiator, acrylamide, a carboxyl group-containing monomer and a sulfur-containing Acid group monomers are reacted to obtain instant polyacrylamide.

[0029] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0030] According to the present invention, the reaction is preferably carried out with water as a solvent; acrylamide is mixed with water, and the mass fraction of said acrylamide in the aqueous solution is preferably 10% to 30%, more preferably 15% to 30%, more preferably 15% to 25%.

[0031] Then add carboxyl group-containing monomers and sulfonic acid group-containing monomers. Wherein, the carboxyl group-containing monomer is a carboxyl group-containing monomer well known to those skilled in the art, and ...

Embodiment 1

[0053] 1.1 Weigh acrylamide and mix it with distilled water, stir and dissolve it fully, add 3% acrylic acid (weight percentage based on acrylamide) and sodium methacrylsulfonate 5% (weight percentage based on acrylamide), Add distilled water, make monomer total mass be 20% of solution total mass, obtain mixed solution; Be that the sodium hydroxide of 10% is regulated mixed solution pH value to 9 with mass fraction, then add cosolvent urea 1% (take mixed solution as The percentage by weight of basis), chain extender is ethylene glycol 0.05% (percentage by weight based on mixed solution), chain transfer agent sodium formate 0.05% (percentage by weight based on mixed solution) and complexing agent sorbic acid Alcohol 0.05% (weight percent based on the mixed solution), after being stirred evenly, put into a reaction bottle and carry out vacuuming-nitrogen (purity of nitrogen is greater than 99.99%) to remove oxygen for 1h, then add oxidation initiator potassium persulfate 0.002% ...

Embodiment 2

[0061]2.1 Weigh acrylamide and mix it with distilled water, stir to dissolve fully, add 5% acrylic acid (weight percentage based on acrylamide), sodium vinylsulfonate 5% (weight percentage based on acrylamide), hydroxyl Sodium ethyl methyl cellulose 0.4% (weight percentage based on acrylamide, ultrasonically activated for 25 minutes in advance), distilled water was added so that the total mass of the monomers was 25% of the total mass of the solution to obtain a mixed solution; with a mass fraction of 10 % sodium hydroxide to adjust the pH value of the mixed solution to 10, add cosolvent urea 0.5% (weight percentage based on mixed solution), chain extender is ethylenediamine 0.05% (weight percentage based on mixed solution ), chain transfer agent sodium acetate 0.05% (weight percent based on mixed solution) and complexing agent sodium ethylenediamine tetramethylene phosphonate 0.05% (weight percent based on mixed solution), stir Afterwards, pack into the reaction flask and car...

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Abstract

The invention provides a polyacrylamide and a preparation method thereof. The preparation method comprises the following steps: A) under the condition that a redox initiator system and an azo initiator exist, conducting reaction on acrylamide, carboxy group contained monomers and sulfonic group contained monomers to obtain polyacrylamide. Compared with the prior art, the preparation method has the advantages that carboxy and sulfonic group contained hydrophilic groups are introduced into polyacrylamide, so that the dissolving property of polymer is enhanced; meanwhile, a compound initiator system is adopted, polymerization reaction can be finished in a high-low temperature section initiating manner, the combination of the redox initiator system with relatively low activation energy and the azo initiator with relatively high activation energy is utilized, and free radicals are released at different reaction temperatures and different stages respectively, so that the free radicals can keep certain concentration, the polymerization reaction speed is slow, the control is easy, uniform and smooth chain growth is facilitated, the initiating efficiency is fully improved, and the high-molecular polymer with a relatively high dissolving property is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer compounds, and in particular relates to an instant polyacrylamide and a preparation method thereof. Background technique [0002] Polymer flooding is a flooding method that injects a water-soluble polymer solution into the oil reservoir. By increasing the viscosity of the injected water and improving the mobility ratio, the affected area of ​​the displacement phase can be effectively increased, and the oil saturation can be reduced to increase oil recovery. yield. The polymer injected into the oil layer will have two important effects: one is to increase the viscosity of the water phase, and the other is to reduce the permeability of the oil layer due to the retention of the polymer. The result of the combined effect of the two aspects is that the fluidity of the polymer aqueous solution in the oil layer is significantly reduced. Therefore, after the polymer is injected into the oil layer, there...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F228/02C08F220/58C08F2/38C08F4/40C08F4/04C08F8/12C09K8/588
Inventor 杨雪卢琼王江红张宁
Owner 华鼎鸿基采油技术服务(北京)有限公司
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