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A kind of nano-magnetic fluid for fracturing fracture monitoring and its preparation method

A nano-magnetic fluid and magnetic particle technology, applied in magnetic liquids, measuring devices, utilizing re-radiation, etc., can solve the problems of lack of nano-magnetic fluid preparation technology, unsuitable for large-scale use of crack monitoring, complicated steps, etc., achieving easy availability of raw materials. Low cost, simple and feasible method, and short reaction time

Active Publication Date: 2016-07-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing nano-magnetic fluid preparation method, the steps are complicated, high temperature and high pressure equipment are required, the output is small, and the cost is high, so it is not suitable for the situation where a large amount of crack monitoring is required
At present, there is no preparation technology specifically for nano-magnetic fluids for fracturing fracture monitoring

Method used

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  • A kind of nano-magnetic fluid for fracturing fracture monitoring and its preparation method
  • A kind of nano-magnetic fluid for fracturing fracture monitoring and its preparation method
  • A kind of nano-magnetic fluid for fracturing fracture monitoring and its preparation method

Examples

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Embodiment 1

[0046] A method for preparing a nano-magnetic fluid used for fracturing fracture monitoring, comprising the following steps:

[0047] (1) 8.1gFeCl 3 ·6H 2 O and 5.8gFeSO 4 ·7H 2 O was dissolved in 75ml of deionized water, placed in a three-necked bottle heated by a water bath, and stirred evenly with a mechanical speed of 800r / min;

[0048] (2) Warm up the water bath to 50°C, dissolve 5.3g NaOH in 75ml deionized water and slowly add it into the three-necked bottle under the stirring condition of a mechanical speed of 800r / min, and keep it for 30min; after the reaction is complete, adjust the pH to 5 with hydrochloric acid;

[0049] (3) Add 20ml of deionized water dissolved with 2.55g of trisodium citrate dihydrate, raise the temperature to 85°C, and keep for 1 hour to further mature the particles;

[0050] (4) Use a permanent magnet to suck the nano-magnetic particles to the bottom, remove the supernatant, add deionized water to wash, and repeat 3 times; add 23ml of deioni...

Embodiment 2

[0052] A method for preparing a nano-magnetic fluid used for fracturing fracture monitoring, comprising the following steps:

[0053] (1) 6.1gFeCl 3 ·6H 2 O and 2.7gFeCl 2 4H 2 O was dissolved in 75ml of deionized water, placed in a three-necked bottle heated by a water bath, and stirred evenly with a mechanical speed of 800r / min;

[0054] (2) Heat the water bath to 50°C, dissolve 3.78g of NaOH in 75ml of deionized water and slowly add it to the three-necked bottle under the condition of stirring at a mechanical speed of 800r / min, and keep it for 30min; after the reaction is complete, adjust the pH to 5 with hydrochloric acid;

[0055] (3) Add 20ml of deionized water dissolved with 1.1g of sodium oleate, raise the temperature to 85°C, and keep for 1h to further mature the particles;

[0056] (4) Use a permanent magnet to attract the nano-magnetic particles to the bottom, remove the supernatant, add deionized water to wash, and repeat 3 times; add 16ml of deionized water as...

Embodiment 3

[0058] A method for preparing a nano-magnetic fluid used for fracturing fracture monitoring, comprising the following steps:

[0059] (1) 8.1gFeCl 3 ·6H 2 O and 5.8gFeSO 4 ·7H 2 O was dissolved in 75ml of deionized water, placed in a three-necked bottle heated by a water bath, and stirred evenly with a mechanical speed of 800r / min;

[0060] (2) Warm up the water bath to 50°C, add 7.3ml of 25-28wt% ammonia water under the condition of stirring at a mechanical speed of 800r / min, and keep for 30min; after the reaction is complete, adjust the pH to 5 with hydrochloric acid;

[0061] (3) Add 20ml of deionized water dissolved with 1.76g of trisodium citrate dihydrate, raise the temperature to 85°C, and keep for 1 hour to further mature the particles;

[0062] (4) Use a permanent magnet to suck the nano-magnetic particles to the bottom, remove the supernatant, add deionized water to wash, and repeat 3 times; add 23ml of deionized water as a carrier liquid, stir and disperse evenl...

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Abstract

The invention relates to a nano magnetic fluid for monitoring a fracturing crack and a preparing method of the nano magnetic fluid. The nano magnetic fluid is formed by taking Fe3O4 particles modified by a surface modifier as magnetic particles and water as a carrier liquid. The invention also relates to a preparing method of the nano magnetic fluid. The nano magnetic fluid is better in hydration stability, narrow in size distribution, higher in molar susceptibility, low in price of preparing raw materials, simple and easy in preparing process, suitable for industrial production and capable of being used for the field of monitoring on a reservoir layer or crack.

Description

technical field [0001] The invention relates to a nano magnetic fluid used for monitoring fracturing cracks in a hydraulic fracturing process and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] Many large high-permeability oil and gas fields around the world have entered the late stage of exploitation, and the oil and gas resources in low-permeability oil and gas fields are expected to become the continuous driving force for future energy and economic development in the world. The oil and gas in these tight reservoirs need to be hydraulically fractured to achieve economical and effective extraction. After oil and gas wells undergo hydraulic fracturing operations, oil and gas production has been effectively increased. In order to evaluate the actual state of fractures after fracturing operations and guide the optimization of subsequent fracturing operations, operating companies need to obtain information su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44G01V3/08
CPCY02A90/30
Inventor 罗明良孙涛温庆志刘飞郭烨杨国威吕子龙李楠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)