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Shale pore structure fluid flow channel tracer, preparation method and tracing method

A pore structure and fluid flow technology, which is applied in the field of shale pore structure fluid flow channel tracer, preparation of shale micro-nano pore fluid flow channel tracer, and shale pore structure fluid flow channel tracer field , which can solve the problem that it is difficult to directly obtain the fluid migration information in the micro-nano pores of shale, and achieve the effect of high resolution, obvious tracer and simple steps.

Pending Publication Date: 2021-02-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a tracer for fluid flow channels in the micro-nano pores of shale, which introduces metal elements that are easily identified under the scanning electron microscope, and solves the problem of visually judging shale in the prior art Hydrophilic porosity problem
[0005] The present invention also provides a tracer method for the fluid flow channel in the shale pore structure, using a tracer that can be easily identified under the scanning electron microscope and can achieve spontaneous imbibition with the shale pores to control the fluid entering the shale sample Trace the flow channel of the shale, which solves the technical problem that it is difficult to directly obtain the migration information of the fluid in the micro-nano pores of the shale in the prior art

Method used

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  • Shale pore structure fluid flow channel tracer, preparation method and tracing method
  • Shale pore structure fluid flow channel tracer, preparation method and tracing method
  • Shale pore structure fluid flow channel tracer, preparation method and tracing method

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preparation example Construction

[0064] The preparation method of above-mentioned gold nano particle tracer, it specifically comprises the following steps:

[0065] S1) Uniformly disperse 0.4 g of polyvinylpyrrolidone in ultrapure water.

[0066] S2) Add an aqueous solution of chloroauric acid and a reducing agent to the dispersion in step S1).

[0067] Described chloroauric acid solution concentration is 2.44 * 10 -3 mol / L~5.0×10 -3 mol / L; the reducing agent is preferably trisodium citrate, or hydroxylamine hydrochloride or trisodium citrate and hydroxylamine hydrochloride.

[0068] S3) Heating the reaction liquid in step S2) to 75° C. and stirring for 30-60 min, the reaction is complete.

[0069] S4) Cool the system after complete reaction to room temperature, disperse in ultrapure water added with polyethylene glycol, and stir for 1-2 hours to obtain gold nanoparticles.

[0070] The preparation method of above-mentioned gold / ferric oxide composite nano particle tracer, it specifically comprises the fol...

Embodiment 1

[0091] In a 250mL flask, mix 0.4g polyvinylpyrrolidone and 80mL ultrapure water, then add 2.44×10 - 3 mol / L chloroauric acid solution 10ml, and the flask was placed in a constant temperature water bath and heated to 75°C, and then 3.43×10 -2 mol / L sodium citrate solution 3ml, continue to stir for 30min, after returning to room temperature, add 5mg of polyethylene glycol under stirring, continue stirring for 1h, to obtain gold nano tracer.

Embodiment 2

[0093] Weigh 2.34gFeCl 3 ·6H 2 O (ferric chloride hexahydrate) with 0.96g FeCl 2 4H 2 O (ferrous chloride tetrahydrate) was added to a flask (250 mL), and 100 mL of deoxygenated ultrapure water was added, and the flask was placed in a constant temperature water bath at 80° C., and nitrogen was filled in the flask to remove oxygen. Under mechanical stirring (stirring rate 800r / min), use a dropping funnel to slowly drop 40mL of NaOH solution with a concentration of 1.15mol / L into the flask. After the addition is complete, add 40mL of trisodium citrate with a concentration of 0.1mol / L , continue to react for 30min. After cooling to room temperature, the obtained particles were subjected to magnetic separation with a magnet, and washed three times with deoxygenated ultrapure water to obtain ferric oxide nanoparticles.

[0094] Take 50 mg of the prepared iron ferric oxide nanoparticles and put them into a beaker, add 150 mL of deoxygenated ultrapure water, and ultrasonicate for...

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Abstract

The invention relates to a shale pore structure fluid flow channel tracer, a preparation method and a tracing method, which relate to the technical field of shale gas development. The tracer agent comprises gold nanoparticles or ferroferric oxide nanoparticles and composite nanoparticles containing any one of the gold nanoparticles or ferroferric oxide nanoparticles. The tracing method comprises the following steps of introducing a nano tracer with proper concentration into a fluid spontaneous imbibition experiment of shale or sucking fluid containing a magnetic nano tracer into a shale micro-nano pore structure by utilizing an external magnetic field, and carrying out electron microscope scanning on a shale sample after the fluid is dried, and revealing a flow channel of the fluid in theshale micro-nano pore structure by utilizing the position information of the nano tracer. According to the shale micro-nano pore structure fluid channel tracer and the tracing method, the problem thatmigration information of fluid in shale micro-nano pores cannot be visually obtained through an existing tracer and an existing tracing method is solved, and compared with traditional CT and microscopic optical microscopic imaging, the shale micro-nano pore structure fluid channel tracer and the tracing method have higher resolution.

Description

[0001] The invention relates to the technical field of shale gas development, in particular to a shale pore structure fluid flow channel tracer, a preparation method and a tracer method. Background technique [0002] At present, hydraulic fracturing is the core technology of shale gas development. The study of the flow characteristics of water in the shale pore structure has very important research significance for revealing the fluid transport and water erosion characteristics of shale during hydraulic fracturing. A large number of experimental studies of water spontaneous dialysis have been used to characterize the flow characteristics of water in the shale pore structure. Although these methods can use the fluid self-imbibition rate in the spontaneous imbibition process to qualitatively analyze the flow characteristics of water and further judge the connectivity characteristics of shale micro-nano pores, they cannot obtain the microscopic migration path of water. Hu Qinhon...

Claims

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Application Information

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IPC IPC(8): G01N23/2251G01N23/2202
CPCG01N23/2251G01N23/2202G01N2223/401G01N2223/418
Inventor 李娜杨洪志陈倩霞殷樱子周文
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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