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Organic porous nanoparticle/surfactant composite oil displacement system and preparation method thereof

A surfactant and nanoparticle technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of oil displacement without surfactant synergistic effect, reduce the economical efficiency of surfactant flooding, and increase engineering operation. cost and other issues, to achieve the effect of synergistic surfactant flooding, good temperature resistance and salt resistance, and the effect of improving oil recovery.

Active Publication Date: 2020-03-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the injection amount of sacrificial agent is usually large, and sacrificial agent itself does not have obvious surfactant synergistic oil displacement effect, the use cost of sacrificial agent itself will still reduce the performance of surfactant flooding to a certain extent. Economical; in addition, the injection process of the sacrificial agent requires a long construction period, which will also increase the operating cost of the project in the actual construction process

Method used

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  • Organic porous nanoparticle/surfactant composite oil displacement system and preparation method thereof
  • Organic porous nanoparticle/surfactant composite oil displacement system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add the mixture of 10g styrene and 0.5g divinylbenzene dropwise into 100g deionized water dissolved with 0.2g sodium lauryl sulfate, and at the same time stir and emulsify at a speed of 300 rpm, styrene, divinylbenzene Continue to stir and emulsify for 1 hour after the benzene mixture is added dropwise. After the emulsification is completed, pass nitrogen gas to remove oxygen for 15 minutes and raise the temperature of the emulsion to 80° C. and add 5 g of potassium persulfate in water to initiate the reaction. The mass concentration of potassium persulfate in water is 3%. During the reaction, the stirring rate was kept at 300 rpm, and the reaction was completed after 8 hours. Add ethanol to the reacted emulsion to break the emulsion, then centrifuge the cross-linked polystyrene nanospheres, wash the cross-linked polystyrene nanospheres with ethanol several times and then dry them to obtain the dry cross-linked polystyrene nanospheres product.

[0044] Disperse 2.5 g o...

Embodiment 2

[0047] Add the mixed solution of 8g styrene and 0.2g divinylbenzene dropwise into 100g deionized water dissolved with 0.24g sodium lauryl sulfate, and at the same time stir and emulsify at a speed of 350 rpm, styrene, divinylbenzene Continue to stir and emulsify for 1 hour after the benzene mixture is added dropwise. After the emulsification is completed, pass nitrogen gas to deoxygenate for 15 minutes and raise the temperature of the emulsion to 80° C. and add 3.3 g of potassium persulfate aqueous solution to initiate the reaction. The mass concentration of potassium persulfate aqueous solution is 3 %, the stirring rate was kept at 350 rpm during the reaction, and the reaction was completed after 8 hours. Add ethanol to the reacted emulsion to break the emulsion, then centrifuge the cross-linked polystyrene nanospheres, wash the cross-linked polystyrene nanospheres with ethanol several times and then dry them to obtain the dry cross-linked polystyrene nanospheres product.

...

Embodiment 3

[0051] Using the organic porous nanoparticle / surfactant composite oil displacement system prepared in Example 1 and the 0.2% alcohol ether carboxylate aqueous solution to carry out sand-packing pipe displacement experiments under the same conditions, the sand-packing experiments in the displacement experiments The inner diameter of the model is 25mm, the length is 500mm, the porosity is about 30%, and the permeability is about 0.8μm 2 , the temperature condition is room temperature, and the displacement rate is 0.2mL / min. The dynamic adsorption amount of surfactant is calculated according to the change of alcohol ether carboxylate concentration in the core production fluid, and the change of alcohol ether carboxylate concentration is measured by ultraviolet spectrophotometry Compared with the 0.2% alcohol ether carboxylate aqueous solution, the dynamic adsorption capacity of the surfactant in the organic porous nanoparticle / surfactant composite flooding system of the present in...

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Abstract

The invention discloses an organic porous nanoparticle / surfactant composite oil displacement system and a preparation method thereof. The composite oil displacement system comprises organic porous nanoparticles and a surfactant, and the preparation method comprises the steps of evenly dissolving the surfactant in water to form a surfactant solution; and adding the organic porous nanoparticles intothe surfactant solution according to the ratio, and carrying out ultrasonic dispersion to obtain the organic porous nanoparticle / surfactant composite oil displacement system. The preparation method is simple and low in cost; through the interaction of the organic porous nanoparticles and the surfactant, the two effects of reducing the adsorption loss of the surfactant and enhancing the oil displacement effect of the surfactant can be achieved at the same time; in addition, the composite oil displacement system has good temperature resistance and salt resistance, can be used as an oil displacement agent in an oil field environment under the conditions of wide mineralization degree from low mineralization degree to high mineralization degree and wide temperature from low temperature to hightemperature to improve the crude oil recovery rate, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry in the enhanced crude oil recovery technology, in particular to an organic porous nano particle / surfactant composite oil displacement system and a preparation method thereof. Background technique [0002] In most oilfields in my country, the recovery rate of crude oil after water flooding is generally not more than 40%, and most of the crude oil remains undeveloped in the formation. In order to further enhance oil recovery and achieve stable production in old oilfields, chemical flooding technology has been widely used in my country and has achieved good industrial application results. Surfactant flooding technology, as an important chemical flooding technology, can significantly increase oil recovery by reducing oil-water interfacial tension, improving rock surface wettability, and oil-water emulsification. [0003] However, in industrial applications, it is found that surfactant flo...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 杨洋杨斌张浩郭芸菲郑洁王睿
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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