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Hydrophobically associating polymer sulfonate oil-displacing agent and synthesizing method thereof

A polymer and oil displacement agent technology, applied in the field of hydrophobic association polymer sulfonate oil displacement agent and its synthesis, can solve the problems of poor stability of water-soluble solutions

Inactive Publication Date: 2015-02-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the commonly used hydrophobic association polymers have problems such as water solubility and poor solution stability.

Method used

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  • Hydrophobically associating polymer sulfonate oil-displacing agent and synthesizing method thereof
  • Hydrophobically associating polymer sulfonate oil-displacing agent and synthesizing method thereof
  • Hydrophobically associating polymer sulfonate oil-displacing agent and synthesizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: the synthesis of monomer NIMA

[0042] The synthetic method of monomer NIMA is as follows:

[0043] (1) Add 56.48g of oleic acid, 24.76g of diethylenetriamine, and 27-43g of xylene into the reactor. After mixing well, heat to 142-162°C and reflux for 2.5h. The xylene Carried water is separated;

[0044] After cooling to 120°C, distill under reduced pressure for 0.5h;

[0045] Raise the temperature to 200-220°C again and react for 2 hours to obtain the initial product A;

[0046] The initial product A was liquid-purified with ethyl acetate and deionized water to obtain 1-(2-aminoethyl)-2-oleic acid imidazoline.

[0047] (2) In the reactor, dissolve 3.49g of 1-(2-aminoethyl)-2-oleyl imidazoline into 20mL of absolute ethanol, and stir to dissolve;

[0048] Dissolve 1.25g of maleic anhydride in 30mL of absolute ethanol, and slowly add it dropwise to the reactor, heat to 50°C and react for 4-5 hours to obtain the initial product B;

[0049] Use dichloromet...

Embodiment 2

[0050] Embodiment 2: the synthesis of monomer NDS

[0051] The synthesis method of monomer NDS is as follows:

[0052] (1) Add 50g of deionized water and 32.34g of sodium bisulfite into the reactor, mix well, and heat to 85°C;

[0053] After slowly adding 25g of epichlorohydrin dropwise into the reactor, the reaction was carried out at constant temperature for 2 hours;

[0054] Pour out the product while it is hot, cool with an ice-water bath (≤10°C), recrystallize, separate and purify the product to obtain sodium 3-chloro-2-hydroxypropanesulfonate.

[0055] (2) Add 7.8g diallylamine and 10g deionized water into the reactor, stir and dissolve;

[0056] Dissolve 15.5g of sodium 3-chloro-2-hydroxypropanesulfonate in 30g of deionized water, stir and dissolve, then slowly drop into the reactor;

[0057] React at 60°C for 4-6 hours, add 50% sodium hydroxide solution dropwise during the reaction time to keep the pH of the reaction system at 8-9;

[0058] After the reaction is comp...

Embodiment 3

[0060] Embodiment 3: the synthesis of tetrapolymer sulfonate oil displacement agent

[0061] The preparation method of tetrapolymer sulfonate oil displacement agent is as follows:

[0062] (1) Add 0.01gNIMA, 0.10gNDS, 6.49gAM and 20.0g deionized water into the beaker according to the raw material ratio in Table 1, stir until the emulsification is complete, then transfer to the three-necked flask;

[0063] (2) Dissolve 3.40g of AA in 15g of deionized water, and adjust the pH of the solution to 7, then transfer to the flask in (1);

[0064] (3) adding a certain amount of deionized water to prepare the solution into an aqueous solution with a concentration of 10% to 20% by weight of the total mass of raw materials;

[0065] (4) Under the condition of constant temperature water bath at 40°C, pass nitrogen gas and stir for 10-20 minutes, then add initiator ammonium persulfate and sodium bisulfite, the molar ratio of ammonium persulfate and sodium bisulfite is 1:1, and the amount o...

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Abstract

The invention relates to an oil-displacing agent and a preparation method thereof, and particularly relates to a hydrophobically associating polymer sulfonate oil-displacing agent. The oil-displacing agent is prepared from the following four monomers: acrylamide (AM), sodium acrylate (NaAA), sulfonate functional monomer NDS and hydrophobic monomer NIMA. According to the polymer sulfonate oil-displacing agent and a preparation method thereof, a long-chain hydrophobic group is introduced to enhance the associating action among molecules and improve water solubility and salinity resistance of a polymer; a five-membered heterocyclic imidazoline structure is introduced, so that the rigidity of a polymer molecular chain can be remarkably enhanced, and the viscosifying capacity, temperature tolerance and shearing resistance of the polymer can be improved; a sulfonate group is introduced, so that the water solubility and salinity resistance of the polymer can be greatly improved. The polymer oil-displacing agent shows good temperature tolerance, salinity resistance and anti-shearing dilutability, and can be used for well increasing the oil recovery. The oil-displacing agent has the advantages of simple synthesizing method, high yield, stable performance and environmental friendliness, and has a relatively good practical application prospect.

Description

technical field [0001] The invention relates to a hydrophobic association polymer sulfonate oil displacement agent and a synthesis method thereof. Background technique [0002] Hydrophobic association polymers refer to a class of water-soluble polymers with a small amount of hydrophobic groups on the hydrophilic molecular chain of the polymer. Due to the association between long-chain hydrophobic groups, its aqueous solution exhibits good viscosity-increasing effect, resistance to shear dilution, and good stability under high temperature and high salinity conditions. However, most commonly used hydrophobic association polymers have problems such as water solubility and poor solution stability. [0003] In this regard, introducing a rigid heterocyclic ring into the polymer molecular chain can form a dense spatial network structure, thereby effectively improving the rheology, salt resistance, and oil-water interface flow ratio of the polymer solution; introducing sulfonic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588E21B43/22C08F220/56C08F220/06C08F226/02C08F222/38
CPCC08F220/56C09K8/588E21B43/16C08F220/06C08F226/02C08F222/38
Inventor 苟绍华罗珊赵鹏张勤陈宇敬东
Owner SOUTHWEST PETROLEUM UNIV