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Water-soluble heat-resistant and salt-tolerant AM/AA/AMPS/NPAB polymer oil displacement agent and its synthesis method

A synthetic method and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as viscosity reduction, and achieve the effects of improving temperature resistance, increasing oil recovery, and remarkable oil displacement effect

Inactive Publication Date: 2013-11-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high-temperature reservoir conditions, PAM or HPAM molecules degrade, and under high-salinity reservoir conditions, PAM or HPAM molecular chains curl up, and the viscosity is greatly reduced, making it unable to meet actual needs

Method used

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  • Water-soluble heat-resistant and salt-tolerant AM/AA/AMPS/NPAB polymer oil displacement agent and its synthesis method
  • Water-soluble heat-resistant and salt-tolerant AM/AA/AMPS/NPAB polymer oil displacement agent and its synthesis method
  • Water-soluble heat-resistant and salt-tolerant AM/AA/AMPS/NPAB polymer oil displacement agent and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Synthesis of AM / AA / AMPS / NPAB Polymers

[0019] Add functional monomer NPAB and emulsifier OP-10 according to the ratio in Table 1 in a 250mL three-necked flask, add a small amount of distilled water and stir evenly, then add AMPS, AM and AA solutions whose pH is adjusted to 7 with 1mol / L NaOH solution, Make an aqueous solution with a total monomer mass of 20%, keep the temperature at 40°C, then add the initiator ammonium persulfate solution and sodium bisulfite solution, seal and react at a temperature of 40°C for 8 hours, precipitate with absolute ethanol, and crush the precipitate , soaked in absolute ethanol and dried in an oven at 40°C to prepare AM / AA / AMPS / NPAB polymer.

[0020] The synthetic drug consumption of table 1AM / AA / AMPS / NPAB polymer

[0021]

Embodiment 2

[0022] Embodiment 2: Determination of the best synthetic conditions of AM / AA / AMPS / NPAB polymer

[0023] (1) Effect of monomer dosage on polymerization reaction

[0024] The dosage of initiator is 0.29wt%, the pH is 7, the temperature is 40℃, the dosage of OP-10 is 0.02g, and the influence of AMPS, NPAB, AM and AA on the polymerization reaction is investigated by using single factor method and changing the ratio of monomer dosage , and the results are shown in Table 2. The optimal mass percentages of the monomers are: AM58.14%, AA38.76%, AMPS2.91%, and NPAB0.19%.

[0025] The impact of table 2 AMPS, NPAB, AM, AA concentration on polymerization reaction

[0026]

[0027] a Polymer solution concentration: 2000mg / L

[0028] (2) Influence of initiator dosage, pH and temperature on polymerization reaction

[0029] The mass percentages of the monomers used were AM58.14%, AA38.76%, AMPS2.91%, NPAB0.19%, and the amount of OP-10 was 0.02g. The influence of the amount of initiator...

Embodiment 3

[0030] Embodiment 3: AM / AA / AMPS / NPAB polymer structure characterization

[0031] The infrared spectrogram of polymer AM / AA / AMPS / NPAB made by embodiment 1 is as figure 1 shown. According to the polymer spectrum, 3434.50cm -1 Yes-NH 2 stretching vibration; 2934.93cm -1 is the stretching vibration of methylene; 1665.94cm -1 is the C=O stretching vibration in the amide group; 1188.21cm -1 yes-so 3 - The absorption peak, 1077.30cm -1 is the absorption peak of -C-O-.

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Abstract

The invention relates to an AM / AA / AMPS / NPAB polymer oil displacement agent and its synthesis method. According to a technical scheme, the raw materials comprise, by mass: 58.14% of acrylamide (AM), 38.76% of acrylic acid (AA), 2.91% of 2-acrylamido-2-methyl propane sulfonic acid (AMPS), and 0.19% of 1-(allyloxy)-4-nonyl benzene (NPAB). The synthesis method includes: adding certain amount of NPAB and an emulsifier OP-10 into a three-necked flask, adding an AMPS solution, an AM solution and an AA solution with pH values adjusted to definite values to prepare an aqueous solution with a monomer concentration of 20wt%, when the temperature reaches constant, adding initiators, i.e. an ammonium persulfate solution and a sodium hydrogen sulfite solution, and letting them react for 8h under certain temperature, using anhydrous ethanol to conduct washing, and performing crushing and drying, thus obtaining the AM / AA / AMPS / NPAB polymer. The polymer has good water solubility, tackifying ability, and heat resistance and salt tolerance. In the circumstance of indoor simulation, the crude oil recovery rate can be improved by 11%.

Description

technical field [0001] The invention relates to a water-soluble polymer oil displacement agent for enhancing oil recovery and a synthesis method thereof. Background technique [0002] At present, polyacrylamide (PAM) or partially hydrolyzed polyacrylamide (HPAM) is the most important polymer oil displacement agent for enhanced oil recovery. However, under high-temperature reservoir conditions, PAM or HPAM molecules degrade, and under high-salinity reservoir conditions, PAM or HPAM molecular chains curl up, and the viscosity is greatly reduced, making it unable to meet actual needs. Therefore, scholars at home and abroad have done a lot of research work on improving the temperature and salt resistance of polymers. [0003] In 1995, Yahaya G O et al. introduced long-chain 1-dodecene or 1-hexadecene, and copolymerized with maleic anhydride to form 1-dodecene or 1-hexadecene / maleic anhydride copolymerization It exhibits good salt resistance and low surface and interfacial tens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F220/58C08F216/20
Inventor 苟绍华尹婷叶仲斌周利华杨成张涛段卫宇
Owner SOUTHWEST PETROLEUM UNIV