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A kind of nanofluid for tracing between wells and its preparation method and application

A nanofluid and tracer technology, applied in construction and other directions, can solve problems such as difficult separation, inability to reuse, quantitative analysis, etc., and achieve the effects of cost saving, large surface area, and strong transport and carrying capacity.

Active Publication Date: 2021-02-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it contains heavy metals that pollute the formation, and the tracer output curve can only qualitatively analyze the breakthrough direction of the injected water and the area where the remaining oil is located, and the tracer cannot be released when encountering oil and water, so its output cannot be passed Quantitatively analyze the remaining oil content in different areas, and it is not easy to separate it from the produced water and cannot be reused

Method used

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  • A kind of nanofluid for tracing between wells and its preparation method and application
  • A kind of nanofluid for tracing between wells and its preparation method and application
  • A kind of nanofluid for tracing between wells and its preparation method and application

Examples

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Embodiment 1

[0061] A preparation method for interwell tracer nanofluid, the steps are as follows:

[0062] (1) Mix 65g ferric oxide nanoparticles and 43mlC 12 h 16 N 4 o 4 Add 50ml of deionized water, put it into a three-neck flask with water bath heating, add 4.3g of tetrahydrofuran; keep the temperature of the water bath at 25°C, and mechanically stir at a speed of 500r / min for 1h to obtain a mixed solution;

[0063] (2) leave the mixed solution of step (1), after the solid particles settle completely, remove the supernatant; Add 100ml mass concentration in the solid particles and be 2% polyvinyl alcohol (PVA) solution, the molecular weight of polyvinyl alcohol 45000; add 2.1g of DCC, and mechanically stir for 1 hour at a speed of 500r / min to obtain a mixed solution;

[0064] (3) leave the mixed solution of step (2), after the solid particles have settled completely, remove the supernatant, add 3ml mass concentration as 97% chlorosulfonic acid and 3ml molar concentration as 1mol / l D...

Embodiment 2

[0068] A preparation method for interwell tracer nanofluid, the steps are as follows:

[0069] (1) 58g ferric oxide nanoparticles and 34mlC 12 h 16 N 4 o 4 Add 43ml of deionized water, put it into a three-necked flask with water bath heating, add 3.6g of tetrahydrofuran; keep the temperature of the water bath at 25°C, and mechanically stir at a speed of 500r / min for 1h to obtain a mixed solution;

[0070] (2) leave the mixed solution of step (1), after the solid particles settle completely, remove the supernatant; Add 100ml mass concentration in the solid particles and be 2% polyvinyl alcohol (PVA) solution, the molecular weight of polyvinyl alcohol 45000; and add 2.0g DMAP, and mechanically stir for 1h at a rotation speed of 500r / min to obtain a mixed solution;

[0071] (3) leave the mixed solution of step (2), after the solid particles have settled completely, remove the supernatant, add 3.5ml mass concentration as 97% chlorosulfonic acid and 2ml molar concentration as D...

Embodiment 3

[0074] A preparation method for interwell tracer nanofluid, the steps are as follows:

[0075] (1) Mix 65g ferric oxide nanoparticles and 43mlC 12 h 16 N 4 o 4 Add 50ml of deionized water, put it into a three-neck flask with water bath heating, add 4.3g of tetrahydrofuran; keep the temperature of the water bath at 25°C, and mechanically stir at a speed of 500r / min for 1h to obtain a mixed solution;

[0076] (2) leave the mixed solution of step (1), after the solid particles settle completely, remove the supernatant; Add the polyvinyl alcohol (PVA) solution of 40ml mass concentration 2% in the solid particles, the molecular weight of polyvinyl alcohol is 50000; and add 0.5g DMAP, and mechanically stir for 1h at a rotating speed of 500r / min to obtain a mixed solution;

[0077] (3) Leave the mixed solution of step (2) standing until the solid particles have settled completely, remove the supernatant, add 4ml of acetic acid with a mass concentration of 36% and 3ml of DMSO with...

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Abstract

The invention relates to a nanofluid for interwell tracing and a preparation method and application thereof. The nanofluid for interwell tracing has the following structural formula: n ranges from 900 to 1360, and i ranges from 600 to 900. , the value of j ranges from 300 to 450. The nanofluid for interwell tracing of the present invention has strong migration ability, is stable under high temperature and high salt, and can monitor the remaining oil layer in the reservoir by using the active components on the carrier. area and content.

Description

technical field [0001] The invention relates to a nanofluid for interwell tracing, a preparation method and an application thereof, and belongs to the technical field of new materials. Background technique [0002] A tracer is a substance that can flow with the injected fluid, indicating the presence, flow direction and seepage velocity of the fluid in the porous medium. For oil fields developed by water flooding, interwell tracing technology can provide information such as the degree of heterogeneity of oil layers, the distribution of injected water underground, and flow characteristics, and has become one of the important reservoir engineering methods. The principle of interwell tracer is to inject tracer from the water injection well, and then monitor the tracer output in the output fluid of the surrounding production wells. By analyzing the tracer output fitting curve, it can reflect the oil-water well during the water injection development process. To understand the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/36C08F8/42C08F8/14C08F16/06E21B47/11
CPCC08F8/14C08F8/36C08F8/42E21B47/11C08F16/06
Inventor 罗明良李钦朋罗帅司晓冬巩锦程杨宗梅战永平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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