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A kind of water-soluble am-aa-nvp-bema tetrapolymer oil displacement agent and its synthetic method

A technology of AM-AA-NVP-BEMA, quaternary copolymer, applied in chemical instruments and methods, drilling composition, etc., can solve the problem of reducing the oil-increasing effect, etc., and achieve the effect of strong shear resistance

Inactive Publication Date: 2015-08-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the polymers used in polymer flooding are mainly polyacrylamide (PAM) or partially hydrolyzed polyacrylamide (HPAM), and these polymers can achieve better oil enhancement effects when used in low-temperature, low-salinity reservoirs , but its oil enhancement effect is greatly reduced when used in high temperature and high salinity reservoirs

Method used

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  • A kind of water-soluble am-aa-nvp-bema tetrapolymer oil displacement agent and its synthetic method
  • A kind of water-soluble am-aa-nvp-bema tetrapolymer oil displacement agent and its synthetic method
  • A kind of water-soluble am-aa-nvp-bema tetrapolymer oil displacement agent and its synthetic method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Synthesis of functional monomer (BEMA)

[0021] Add 9.9g of maleic anhydride and 20mL of absolute ethanol into a 100mL round bottom flask, stir to dissolve it; slowly add a mixed solution of 3.7g of 1,3-propylenediamine and 20mL of absolute ethanol dropwise into the round bottom flask, and wait until After the addition was complete, react at 30°C for 5 hours; filter the reaction product, wash with a large amount of distilled water, and finally dry it at 60°C to obtain the functional monomer (BEMA).

Embodiment 2

[0022] Embodiment 2: the synthesis of water-soluble AM-AA-NVP-BEMA tetrapolymer

[0023] First add 0.02g functional monomer (BEMA), 0.03g NVP, 6.25g AM and 3.70g AA to a 100mL three-necked flask, adjust the pH value to 7.0-7.5 with sodium hydroxide solution, and make the total mass concentration of monomers 20 % aqueous solution; then add initiator ammonium persulfate solution and sodium bisulfite solution (molar ratio is 1:1), the amount of initiator added is 0.5% of the total mass of the monomer, continue to feed nitrogen, at a temperature of 40 ° C Reaction under the conditions for 8 hours; after washing with ethanol, drying and crushing, the tetrapolymer can be obtained.

Embodiment 3

[0024] Example 3: Characterization of Water-Soluble AM-AA-NVP-BEMA Tetrapolymers

[0025] The infrared spectrogram of the water-soluble AM-AA-NVP-BEMA tetrapolymer synthesized by embodiment 2 is as follows figure 1 As shown, the N-H stretching vibration absorption peak is located at 3422.53cm -1 ;-CH 2 The stretching vibration absorption peak is located at 2931.04cm -1 ; C=O stretching vibration absorption peak is located at 1675.22cm -1 ;-NH bending vibration absorption peak (in-plane) absorption peak is located at 1554.93cm -1 ; C-N stretching vibration absorption peak is located at 1400.32cm -1 ;-NH bending vibration absorption peak (out-of-plane) absorption peak is located at 663.67cm -1 ; The characteristic absorption peak of NVP is located at 1456.74cm -1 .

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Abstract

The invention discloses a water-soluble AM-AA-NVP-BEMA quadripolymer oil-displacing agent and a synthetic method thereof. The water-soluble AM-AA-NVP-BEMA quadripolymer oil-displacing agent is a quadripolymer which comprises AM (Acrylamide), AA (Acrylic Acid), NVP (N-Vinyl Pyrrolidone) and BEMA (Functional Monomer); the water-soluble AM-AA-NVP-BEMA quadripolymer oil-displacing agent comprises the following raw materials in percentage by weight: 60%-70% of acrylamide, 29.8%-38.5% of acrylic acid, 0.1%-1.0% of N-vinyl pyrrolidone and 0.1%-0.5% of the BEMA (Functional Monomer). The synthetic method comprises the following steps of: firstly adding the BEMA (Functional Monomer), the N-vinyl pyrrolidone, the acrylic acid and the acrylamide to a three-necked flask, regulating a pH value to 7.0-7.5 by using a sodium hydroxide solution, and adding distilled water to prepare into a water solution with monomer total mass concentration about 20%; after the temperature of a mixed solution reaches 40 DEG C, adding an ammonium persulfate-sodium bisulfite initiating agent, accessing N2 for protection, and reacting at the temperature of 40 DEG C for 6 hours; washing through anhydrous ethanol, drying, and smashing to obtain the quadripolymer. The oil-displacing agent disclosed by the invention has the advantages of good temperature-tolerance property, salt-tolerance property and anti-shearing property.

Description

technical field [0001] The invention relates to the technical field of oilfield polymer flooding, in particular to a water-soluble AM-AA-NVP-BEMA tetrapolymer oil flooding agent and a synthesis method thereof. Background technique [0002] Polymer flooding is to add a certain amount of water-soluble polymers to the injected water to control the mobility, expand the swept volume and enhance the oil recovery by increasing the viscosity of the injected water and reducing the permeability. At present, polymer flooding has entered the stage of industrialization in Daqing, Shengli, Dagang, Jilin, Henan and other oilfields in my country. The polymer flooding in Daqing Oilfield is the largest polymer flooding project in the world. The annual oil production of polymer flooding in this oilfield is The volume is more than 10 million tons. [0003] At present, the polymers used in polymer flooding are mainly polyacrylamide (PAM) or partially hydrolyzed polyacrylamide (HPAM), and these p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F226/10C08F222/38C08F4/40
Inventor 赖南君董帅叶仲斌覃孝平彭琴
Owner SOUTHWEST PETROLEUM UNIV
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