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AM/NaAA/NAC water-soluble polymer oil-displacement agent and synthesizing method thereof

A technology of water-soluble polymer and oil-displacement agent, which is applied in the field of polymer oil-displacement agent and synthesis, to achieve the effects of enhanced oil recovery, increased viscosity, and enhanced rigidity

Inactive Publication Date: 2012-07-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above use of different types of temperature-resistant and salt-resistant functional units to copolymerize with AM and polymers with special molecular structures can improve the temperature-resistant and salt-resistant properties of the polymer to a certain extent, but the high-temperature hydrolysis decomposition, shearing, and anti-corrosion Salt and other aspects also showed certain deficiencies

Method used

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  • AM/NaAA/NAC water-soluble polymer oil-displacement agent and synthesizing method thereof
  • AM/NaAA/NAC water-soluble polymer oil-displacement agent and synthesizing method thereof
  • AM/NaAA/NAC water-soluble polymer oil-displacement agent and synthesizing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of NAC monomer

[0020] In a 250ml three-neck flask equipped with a reflux tube, dissolve 11.3g of caprolactam in tetrahydrofuran as a solvent, then add 3.0g of NaH, slowly add 13.5g of allyl bromide dropwise under constant stirring, and adjust the temperature to 10 o C, reaction 4h. Add a large amount of water under ice-cooling, extract with solvent dichloromethane, wash with saturated brine, dry and filter, and evaporate the solvent to obtain light yellow liquid NAC with a yield of 99%.

Embodiment 2

[0021] Example 2: Synthesis of AM / NaAA / NAC Terpolymer

[0022] First weigh acrylic acid and sodium hydroxide according to the ratio in Table 1, put them into a 250mL jar and dissolve them with distilled water, cool to room temperature, add AM and NAC, and dissolve them completely at room temperature, adjust the pH of the system with NaOH solution to approx. 8. Nitrogen for 20 minutes, add the pre-prepared sodium bisulfite solution, stir for 5 minutes, then add ammonium persulfate solution, continue nitrogen for 10 minutes, at a constant temperature of 45 oC Sealed and reacted for 12 hours; precipitated with absolute ethanol, crushed the precipitate into small particles, soaked in absolute ethanol for 2 days, 40 oC After drying for 2 days, the terpolymer AM / NaAA / NAC was obtained:

[0023] Table 1 Addition amount of ternary polymer synthetic drugs

[0024] drug Amount added (g) NAC 0.1530 distilled water 61.6000 AM 8.5300 AAA 4.3200 N...

Embodiment 3

[0025] Embodiment 3: Structure characterization of AM / NaAA / NAC terpolymer

[0026] The infrared spectrogram of the terpolymer AM / NaAA / NAC synthesized by embodiment 2 is as follows figure 1 shown. It is known from the figure that N-H (-NH 2 ), C-N(-CH 2 -N-) The stretching vibration peaks are at 3426.89cm -1 and 1120.44cm -1 , the -C=O stretching vibration peak is at 1666.20cm -1 .

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Abstract

The invention relates to an oil-displacement agent used in an oil field for improving the recovery efficiency, and a synthesizing method thereof. The synthesizing method comprises the technical schemes that: the agent is prepared from raw materials and monomers of, by mass: 53.5-59.5% of acrylamide AM, 40-45% of sodium acrylate NaAA, and 0.5-1.5% of N-allylcaprolactam NAC; 0.153g of NAC is first added into a flask; 8.53g of AM, 4.23g of AA, and 2.4g of NaOH are added into the flask, such that an aqueous solution with a monomer mass percentage concentration of 10-20%; nitrogen is delivered into the mixture for 20min; (NH4)2S2O8 and NaHSO3 solutions are added; nitrogen is then delivered in for 10-20min; the mixture is subject to a reaction for 4-12h under a temperature of 30-70 DEG C; the product is washed by using absolute ethanol, and is crushed and dried, such that the AM / NaAA / NAC ternary polymer is obtained. The polymer provided by the invention is water-soluble, and shows good temperature resistance, salt resistance, and shearing resistance. As a result of indoor simulation, crude oil recovery efficiency can be improved by 10%.

Description

technical field [0001] The invention relates to a polymer oil displacement agent used for enhancing crude oil recovery in oil fields of the petroleum industry and a synthesis method. Background technique [0002] Polyacrylamide PAM is a very important class of organic water-soluble polymers. It has good adhesion to many solid surfaces and dissolved substances; while partially hydrolyzed polyacrylamide HPAM is mainly due to the electrostatic repulsion between carboxyl groups. The chain stretches and thus has a higher viscosity. Therefore, high molecular weight PAM or HPAM is commonly used in oil fields, but high molecular weight PAM or HPAM has a low viscosity retention rate under the high shear action of pumping and pipeline flow. The higher the molecular weight, the greater the degree of shear thinning. In addition, due to the action of inorganic ions, the repulsion between the carboxyl groups of HPAM decreases and the polymer chain shrinks, so that the viscosity of HPAM d...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F226/06
Inventor 苟绍华封明明叶仲斌苟光俊常静
Owner SOUTHWEST PETROLEUM UNIV
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