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Preparation method of nanofluid for improving oil recovery

A nano-fluid, recovery factor technology, applied in the fields of mining fluids, chemical instruments and methods, earthwork drilling, etc., can solve the problems of reduced recovery factor, etc., and achieve the effect of high utilization rate of raw materials, mild conditions, and easy industrialization.

Active Publication Date: 2014-07-23
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it is found that the oil recovery rate is not directly proportional to the nanofluid concentration, that is, the oil recovery is enhanced when the nanofluid concentration increases, but when the concentration is lower than a critical value, the recovery factor will decrease

Method used

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  • Preparation method of nanofluid for improving oil recovery

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Experimental program
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Embodiment 1

[0030] Take 2.0g of nano-TiO 2 For powder, add 60 mL of deionized water, ultrasonically disperse at room temperature for 30 minutes, and take 2.0 g of silane coupling agent KH-570 (γ-methacryloxypropyltrimethoxysilane) to dissolve in 40 mL of absolute ethanol. TiO 2 Mix the base liquid with the silane coupling agent KH-560 ethanol solution, put it into a three-necked flask, heat it to 70°C while stirring, filter and wash it several times with absolute ethanol, and dry it in a vacuum oven at 60°C , to obtain the modified TiO 2 Nanoparticles.

[0031] Take 0.5g TiO 2 Put the nanoparticles into a three-necked flask, add 300mL of water, heat the water bath to 70°C, add 100mL of a mixed solution of 2g sodium dodecylbenzenesulfonate and 2g PEG-4000, stir mechanically for 8h, wash the stirred dispersion three times, and then Adjust the pH to 8 and add deionized water to 1 L to obtain TiO 2 Water-based nanofluid.

[0032] figure 1 water-based nano TiO 2 TEM image of the fluid,...

Embodiment 2

[0034] Take 2.0g of nano-zinc oxide powder, add 80 mL of deionized water, disperse by ultrasonic at room temperature for 60min, and take 2.0g of silane coupling agent KH-560 (γ-glycidyl ether propoxytrimethoxysilane) to dissolve in anhydrous Ethanol 30mL, mix the nano-zinc oxide base solution with the silane coupling agent KH-560 ethanol solution, put it into a three-necked flask, heat it to 70°C while stirring, react for 4 hours, filter and wash with absolute ethanol several times, After drying in a vacuum oven at 60° C., modified zinc oxide nanoparticles were obtained.

[0035] Take 0.5g of zinc oxide nanoparticles into a three-necked flask, add 200mL of deionized water, raise the temperature of the water bath to 70°C, add 100mL of a mixed solution of 1g of sodium oleate and 1g of PEG-4000, stir mechanically for 8 hours, and carry out the dispersion after stirring. After washing three times, the pH value was adjusted to 8, and deionized water was added to 1 L to obtain a zin...

Embodiment 3

[0037] Nano Fe 3 o 4 Add 80 mL of deionized water to 4 g of powder, and ultrasonically disperse at room temperature for 40 min. Separately take 2 g of silane coupling agent KH-560 (γ-glycidyl ether propoxytrimethoxysilane) and dissolve 30 mL of absolute ethanol. 3 o 4 The base liquid and the silane coupling agent KH-560 ethanol solution were mixed and placed in a three-necked flask for stirring. After reacting in a water bath at 70°C for 8 hours, the solid was obtained by vacuum filtration, and dried in a constant temperature blast drying oven for 12 hours to obtain the modified Fe 3 o 4 particle.

[0038] Take 0.1g nanometer Fe 3 o 4 Put the particles into a three-necked flask, add 300mL of water, raise the temperature in a water bath to 60°C, add 100mL of a mixed solution of 1g sodium oleate and 1g PEG-4000 (polyethylene glycol), stir mechanically for 6h, wash the stirred dispersion three times, and then Adjust the pH to 8 and add deionized water to 100 mL to obtain F...

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Abstract

The invention discloses a preparation method of a nanofluid for improving oil recovery. The preparation method comprises the following steps: taking 2.0-4.0g of nanopowder, adding 60-80mL of deionized water to the nanopowder and carrying out ultrasonic dispersion at a room temperature for 30-60 minutes; dissolving 2.0g of a silane coupling agent in absolute ethyl alcohol; mixing the nano-base solution with the ethanol solution of the silane coupling agent in a three-neck boiling flask, heating while stirring to the range of 70 to 75 DEG C, reacting for 4-6 hours, filtering, washing by using an anhydrous solvent a plurality of times, and drying in a vacuum drying box at 60-70 DEG C for 12 hours to obtain modified nanoparticles; putting 0.1-0.5g of nanoparticles in the three-neck boiling flask, adding 200-300mL of water, heating to the range of 60-75 DEG C by use of a water bath, mixing a surfactant with PEG (Poly Ethylene Glycol), adding 100mL of mixed solution of the surfactant and the PEG, mechanically stirring for 6-8 hours, washing the stirred dispersion 2-3 times, adjusting the pH value to the range of 8-9, and adding deionized water to 1L, thereby obtaining the water-based nanofluid.

Description

[0001] technical field [0002] The invention relates to the field of petrochemical industry, in particular to a method for using nanometer fluid to enhance oil recovery. Background technique [0003] In many oil reservoirs in the world, about two-thirds of the oil cannot be recovered by conventional production methods. Therefore, there is great potential for enhanced oil recovery (EOR) in mature oilfields. Water flooding is a relatively economical way to enhance oil recovery, but in the initial stage of production, water flooding is a more reasonable choice among enhanced oil recovery methods. Waterflood production time After waterflooding, some chemical agents such as alkali, surfactant and polymer can be optionally added to increase the efficiency of the waterflooding process. Adding these chemicals to the injected water changed the wettability of the rock surface to a more hydrophilic state. The injection of polymers increases the viscosity of the injected water, impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58E21B43/22
CPCC09K8/58C09K2208/10
Inventor 赵法军刘永建张继红魏建光闻守斌胡绍彬
Owner NORTHEAST GASOLINEEUM UNIV
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