Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and preparation method thereof

A hydrophobic association and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effects of enhanced oil recovery, increased viscosity, and enhanced rigidity

Inactive Publication Date: 2012-03-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, at home and abroad, there is no relevant report on the oil displacement agent of oleic acid amide polymer; Make the polymer water-soluble to meet the actual construction needs

Method used

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  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and preparation method thereof
  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and preparation method thereof
  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: the preparation of NAO monomer

[0025] Add 42.3g of oleic acid into the reactor, slowly add 10.2g of phosphorus trichloride under stirring, the feeding temperature is controlled at 10-15°C, after the addition is completed, the temperature is raised to 55°C, and the lower layer is removed after 4 hours of heat preservation, and the upper layer is passed through Evaporate and remove unreacted phosphorus trichloride to obtain oleoyl chloride with a yield of 98.8%; dilute 18.7 g of oleoyl chloride obtained in the previous step with dichloromethane solvent and put it into a constant pressure dropping funnel for later use, and then dry it in 250 ml of trichloride Add 4g of allylamine to the neck flask, dilute with dichloromethane solvent, then add 7.6g of triethylamine and 0.02g of hydroquinone, slowly add the ready-to-use oleoyl chloride solution dropwise in an ice bath with constant stirring, and control the drop for 1h. After dropping, react at room temperat...

Embodiment 2

[0026] Example 2: Preparation of Terpolymer AM / NaAA / NAO

[0027] According to the ratio in Table 1, first weigh acrylic acid and dilute it with 10g of deionized water, slowly add sodium hydroxide in an ice bath, and cool to room temperature; add the NAO prepared above into a 250ml three-necked flask, and then add OP-10 to emulsify agent and 10g deionized water, stir well until the emulsification is complete, add acrylamide, then add sodium acrylate solution, adjust the pH to 8 with NaOH solution, and pass nitrogen for 20min; then add initiator sodium bisulfite solution, and then add persulfuric acid Ammonium solution, nitrogen for 10min, at a temperature of 30-70 o C for 10 h; finally washed three times with absolute ethanol, pulverized, 40 o C is dried at a constant temperature to obtain the AM / NaAA / NAO terpolymer;

[0028] Table 1 Addition amount of ternary polymer synthetic drugs

[0029] drug Amount added (g) NAO 0.0321 Deionized water 40.0000 ...

Embodiment 3

[0030] Embodiment 3: Structure characterization of AM / NaAA / NAO terpolymer

[0031] The infrared spectrogram of the ternary polymer AM / NaAA / NAO synthesized by embodiment 2 is as follows figure 1 shown. It is known from the figure that N-H(-NH), C-N(-CH 2 -N-) Stretch vibration peaks are at 3444.24cm -1 and 1121.40cm -1 , the -C=O stretching vibration peak is at 1683.55cm -1 .

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Abstract

The invention relates to a hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and a preparation method thereof. The technical scheme is that: the HAWSP oil displacement agent comprises the following monomers and monomers in percentage by mass: 53.5 to 59.9 percent of acrylamide (AM), 40 to 45 percent of sodium acrylate (NaAA) and 0.1 to 1.5 percent of N-allyl oleylamine (NAO); and the preparation method comprises the following steps of: adding the NAO into a reactor; adding OP-10 and water; adding the AM, AA and NaOH after emulsification is performed completely to prepare a solution with the monomer total mass percentage concentration of 10 to 25 percent; adjusting the pH value to 7.5 to 11; introducing N2 for 20 minutes; adding an initiator; continuously introducing N2 for 20 minutes; reacting at the temperature of between 30 and 70 DEG C for 4 to 12 hours; washing by using absolute ethanol; and crushing and drying to prepare AM / NaAA / NAO terpolymer. The polymer has water solubility and high temperature tolerance, salt tolerance and shearing resistance, and can increase a crude oil recovery rate by over 10 percent simulatively.

Description

[0001] technical field [0002] The invention relates to a water-soluble hydrophobic association polymer oil displacement agent for polymer oil displacement in oil reservoirs of petroleum industry and a preparation method thereof. [0003] Background technique [0004] Water-soluble hydrophobically associating polymers (Hydrophobically associating water-soluble polymers, HAWSP) refer to a class of polymers with a small amount of hydrophobic groups (mole fraction 1% - 5%) on the hydrophilic macromolecular chain of the polymer (Glass JE, et. al . Hydrophilic Polymers: Performance with Environmental Acceptability, Advances in Chemistry Series 248. Washington D C: American Chemical Society, 1996; Glass J E. Associative Polymers in Aqueous Media. ACS Symposium Series 753. Washington D C Society, 1999). HAWSP aggregates through the hydrophobic interaction of hydrophobic groups in the solution, and forms a supramolecular structure dominated by intermolecular association above the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C09K8/588
Inventor 苟绍华封明明叶仲斌刘曼
Owner SOUTHWEST PETROLEUM UNIV
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