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Hydrophobic associated polymer and preparation method thereof

A hydrophobic association and polymer technology, applied in the field of polymers, can solve problems such as rapid drop in solution viscosity, intolerance to salt, and performance degradation

Inactive Publication Date: 2016-06-08
SICHUAN GUANGYA POLYMER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output and quality of natural polymers are limited by seasons and regions, and the performance stability cannot be guaranteed. Compared with synthetic polymers, they are used in large amounts and are easy to biodegrade. Higher water-insoluble substances will also seriously damage the environment in the formation. , which brings many new problems to the later development
At present, the most widely used synthetic polymer is polyacrylamide. Although its performance in all aspects can meet the construction requirements, it is easy to cause mechanical degradation during the pumping process, and the viscosity of the solution drops rapidly. In high-temperature oil reservoir environment, polyacrylamide is not resistant to salt, and is easily degraded at high temperature, resulting in a significant decline in various properties, and it is difficult to further overcome it on the basis of its existing molecular structure. Therefore, from It is imminent to modify the polymer molecular structure to improve its shear resistance, temperature resistance and salt resistance

Method used

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  • Hydrophobic associated polymer and preparation method thereof
  • Hydrophobic associated polymer and preparation method thereof
  • Hydrophobic associated polymer and preparation method thereof

Examples

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preparation example Construction

[0054] The present invention also provides a method for preparing the above-mentioned hydrophobic association polymer, comprising: under the action of an initiator, acrylamide monomer and a hydrophobic monomer are subjected to a copolymerization reaction to obtain a hydrophobic association polymer; the hydrophobic monomer is selected from From N-alkyl substituted acrylamide and its derivatives, alkyl acrylate, alkyl methacrylate, fluorine-substituted alkyl acrylate, fluorine-substituted alkyl methacrylate, allyl alkyl quaternary ammonium One or more of salt, acrylamide alkyl sulfonic acid and sulfonate thereof, alkylphenol polyoxyethylene acrylate and polyoxyethylene alkyl acrylate; the viscosity-average molecular weight of the hydrophobic association polymer is 5 to 35 million; the molar ratio of the acrylamide monomer to the hydrophobic monomer is 1: (0.001 to 0.06).

[0055] Wherein, the hydrophobic monomer is the same as described above, and will not be repeated here. Des...

Embodiment 1

[0084] Feed acrylamide and 2-methacryloxyethyl-dimethyl dodecyl ammonium bromide at a molar ratio of 99:1, add them to a 5000ml beaker and prepare the total monomer mass concentration of 24 with pure water. % mixed solution, stirred until dissolved, heated to 45°C in a water bath, adjusted the pH value of the system to 9 with sodium hydroxide solution, added potassium persulfate and sodium thiosulfate composite initiator to initiate polymerization, wherein potassium persulfate and thiosulfate The mass ratio of sodium sulfate is 1:1, and the amount of potassium persulfate added is 0.10% of the monomer mass. The polymerization reaction is carried out in an adiabatic environment, and the polymerization reaction is considered to be basically completed when the temperature of the reaction system does not rise by more than 1°C within 30 minutes. 1 hour after the completion of the polymerization reaction, take out the colloid, cut the colloid into 3-5mm sized particles, add 2.4% hydr...

Embodiment 2

[0088] According to the steps in Example 1, the mass fraction of the total concentration of monomers in the polymerization system was changed to 20%, and the remaining raw materials and additions remained unchanged.

[0089] The viscosity-average molecular weight of the hydrophobic association polymer obtained in Example 2 was measured and calculated according to GB / T12005.10-92 using an Ubbelohde viscometer (0.55 mm diameter) to be 13.5 million.

[0090] Using water with a total salinity of 49,000, Ca 2+ , Mg 2+ The simulated brine with a total ion concentration of 2200mg / L and the hydrophobic association polymer prepared in Example 2 prepared a polymer solution with a concentration of 5000mg / L at 50°C, and the dissolution time was 1.9h. When the concentration of the polymer solution was 2000mg / L L, the temperature is 85°C, and the shear rate is 7.34s -1 The viscosity value of the tested polymer was 53mPa·s, and under the condition of 85°C, the 90d viscosity retention rate ...

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Abstract

The invention provides a hydrophobic associated polymer, comprising repeating units shown in formula (I) and formula (II), wherein x: y = 1: (0.001 to 0.06); A is a monomeric unit of a hydrophobic monomer; the viscosity average molecular weight of the hydrophobic associated polymer is 5 to 35 million. Compared with the prior art, the hydrophobic associated polymer comprises two monomeric units, and a hydrophilic unit is a monomeric unit of acrylamide, can provide a hydrophilic group for a hydrophobic associated polymer, and ensures that the polymer has good water solubility; a hydrophobic unit is a monomeric unit of the hydrophobic monomer, can provide a hydrophobic side group for the hydrophobic associated polymer, and ensures that a polymer chain has a certain hydrophobic character, and hydrophobic groups gather in water due to a hydrophobic interaction to form a spatial network structure, thereby providing necessary viscoelasticity for a solution; under the combined action of the two units, the temperature resistance and salt tolerance and shear resistance of the hydrophobic associated polymer are improved.

Description

technical field [0001] The invention belongs to the technical field of polymers, in particular to a hydrophobic association polymer and a preparation method thereof. Background technique [0002] In oilfield development and application technology, it is usually necessary to modify the formation environment, etc., and it is necessary to use certain performance fluids for mass transfer and transportation. By injecting these fluids into the formation, certain substances will be brought into the formation to act to transform the formation environment. To achieve the purpose of oil and gas field development and increase production. At the same time, related application technologies also require these fluids to have certain specific properties, such as thickening, viscoelasticity, drag reduction, permeability, and improved mobility ratio. Among them, the most commonly used fluid is aqueous solution, which has the advantages of wide source, economy, and convenient construction. By...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/18C08F220/34C08F220/54C08F220/22C08F226/02C08F226/10C08F212/14C09K8/68C09K8/508
CPCC08F220/56C09K8/5083C09K8/68C09K8/882C08F220/585C08F220/286C08F220/34C08F212/14C08F220/1818C08F226/02C08F226/10C08F220/54C09K8/604C09K8/88C08F220/306C08F220/60C08F212/08C08F220/285C08F220/606C08F220/58
Inventor 郭拥军罗平亚李华兵张新民郭爱民胡俊
Owner SICHUAN GUANGYA POLYMER CHEM
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