A kind of am/aa/nvp/yeml tetrapolymer oil displacement agent and its synthetic method

A synthesis method and polymer technology, applied in drilling compositions, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of low viscosity retention rate, unreachable engineering construction, and reduced polymer fluidity control ability, etc. problems, to achieve good temperature and salt resistance, shear resistance, viscosity, temperature and salt resistance, and oil recovery.

Inactive Publication Date: 2015-08-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High molecular weight polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) are the most commonly used polymers in oil fields, but high molecular weight PAM and HPAM have low viscosity retention under the high shear of pumping and pipe flow
In the field use of oilfields, after the linear PAM and HPAM are sheared, the molecular chains of the polymer will be destroyed, which will reduce the viscosity of the polymer and the adsorption and retention capacity in the porous medium, resulting in the loss of the polymer. Reduced flow control
At the same time, HPAM is easily hydrolyzed and degraded at higher reservoir temperature, so that the viscosity of HPAM drops sharply, which cannot meet the requirements of engineering construction, thus affecting the wide use of PAM and HPAM

Method used

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  • A kind of am/aa/nvp/yeml tetrapolymer oil displacement agent and its synthetic method
  • A kind of am/aa/nvp/yeml tetrapolymer oil displacement agent and its synthetic method
  • A kind of am/aa/nvp/yeml tetrapolymer oil displacement agent and its synthetic method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the preparation of YEML monomer

[0019] Add 4.2g of maleic anhydride and 20mL of ethanol into a 100mL round-bottom flask, stir to dissolve completely; slowly add dropwise a mixed solution of 2mL of ethylenediamine and 20mL of ethanol into the round-bottom flask, and react at 50°C for 4 hours after the dropwise addition is complete ; The reaction product was filtered, washed with a large amount of deionized water, and finally dried at 60°C to obtain the modified functional monomer YEML.

Embodiment 2

[0020] Embodiment 2: the synthesis of tetrapolymer AM / AA / NVP / YEML

[0021] First add 0.0100g of YEML prepared above into a 250mL three-necked bottle according to the ratio in Table 1, then add 6.5000gAM, 3.4700gAA, 1.9085g sodium hydroxide and 0.0200g NVP to prepare the total monomer mass percentage concentration of 10%-20% aqueous solution, nitrogen gas for 30 minutes; then add the initiator ammonium persulfate solution and sodium bisulfite solution, the molar ratio of ammonium persulfate and sodium bisulfite is 1:1, and the amount of initiator added is the total monomer 0.1%-0.5% of the mass, continue to pass N 2 10-20min, react at a temperature of 30-60°C for 4-12h; finally wash with absolute ethanol, pulverize and dry to obtain AM / AA / NVP / YEML tetrapolymer.

[0022] Table 1 Quaternary polymer synthesis drug dosage

[0023] medicine

[0024] NaOH

Embodiment 3

[0025] Embodiment 3: AM / NaAA / NVP / YEML tetrapolymer structure characterization

[0026] The infrared spectrogram of the tetrapolymer AM / AA / NVP / YEML synthesized by embodiment 2 is as follows figure 1 Shown; It can be seen from the figure that -C(O)NH 2 The stretching vibration peak is located at 3413.8cm -1 , the stretching vibration peak of -C=O is located at 1667.7cm -1 ,; the C-N stretching vibrations of primary and secondary amides are respectively at 1387.9 cm -1 and 1309.7cm -1 There is a strong absorption peak, on the NVP ring and C-N stretching vibration at 1169.9cm -1 and 1100cm -1 .

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Abstract

The invention relates to an AM(acrylamide) / AA(acrylic acid) / NVP(N-vinyl pyrrolidinone) / YEML quadripolymer oil-displacing agent and a synthetic method thereof. According to the quadripolymer oil-displacing agent, the oil recovery can be enhanced by polymer flooding. According to the technical scheme, the oil-displacing agent is a quadripolymer consisting of AM, AA, (NVP), a functional monomer (YEML) prepared from ethanediamine and maleic anhydride; the oil-displacing agent is prepared from the following raw materials: 63.5%-70% of AM, 28.7%-36% of AA, 0.1%-0.2% of NVP and 0.1%-0.2% of YEML. The synthetic method comprises the following steps: adding the prepared YEML monomer into a flask firstly; then adding the AM, NVP, acrylic acid and NaOH to prepare a solution with total monomer mass concentration of 10-20%; introducing nitrogen for 30 minutes, then adding an initiator; continuing to introduce N2 for 10-20 minutes, and reacting for 4-12 hours at 30-60 DEG C; washing with absolute ethyl alcohol, crushing, and drying to prepare the AM / AA / NVP / YEML quadripolymer. The viscosity, temperature resistance and salt tolerance and shearing resistance of the quadripolymer are improved greatly, the oil recovery can be better enhanced, and the quadripolymer can be used for oil extraction in an oil field.

Description

technical field [0001] The invention relates to the technical field of enhanced oil recovery by polymer flooding, and particularly designs an AM / AA / NVP / YEML quaternary polymer oil displacement agent and a synthesis method thereof. Background technique [0002] High molecular weight polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) are the most commonly used polymers in oil fields, but high molecular weight PAM and HPAM have low viscosity retention under the high shear of pumping and pipeline flow. In the field use of oilfields, after the linear PAM and HPAM are sheared, the molecular chains of the polymer will be destroyed, which will reduce the viscosity of the polymer and the adsorption and retention capacity in the porous medium, resulting in the loss of the polymer. Flow control ability is reduced. At the same time, HPAM is easy to hydrolyze and degrade at high reservoir temperature, so the viscosity of HPAM drops sharply, which cannot meet the require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F220/06C08F220/56C08F226/10C08F222/36C07C235/80C07C231/02
Inventor 赖南君彭琴覃孝平叶仲斌闻一平李玺李志豪董帅
Owner SOUTHWEST PETROLEUM UNIV
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