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A kind of nano drag reducer and its preparation method and slick water fracturing fluid

A drag reducer, nanotechnology, applied in the directions of nanotechnology, chemical instruments and methods, drilling compositions, etc., to achieve the effect of improving dispersion, increasing stability, and increasing rigidity and strength

Active Publication Date: 2022-05-20
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, there are many methods for synthesizing molybdenum disulfide nanosheets, but there are few methods for obtaining 1T molybdenum disulfide nanosheets by hydrothermal synthesis.

Method used

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  • A kind of nano drag reducer and its preparation method and slick water fracturing fluid
  • A kind of nano drag reducer and its preparation method and slick water fracturing fluid
  • A kind of nano drag reducer and its preparation method and slick water fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The present embodiment prepares a kind of nano drag reducing agent, comprises the following steps:

[0065] 1) Add 1g of molybdenum trioxide powder, 5g of thioformamide and 8g of citric acid into 100mL of deionized water and stir for 30min; then pour the mixed solution into a hydrothermal reactor and react at 180°C for 12 hours. Then wash with deionized water to obtain molybdenum disulfide nanosheets. figure 1 It is the XPS experimental data of molybdenum disulfide nanosheets, the average binding energy of 1T type molybdenum disulfide is 227,231ev, and the average binding energy of 2H type molybdenum disulfide is 229ev, 232ev; figure 2 It is the Raman spectrum data of molybdenum disulfide nanosheets, where the Raman spectrum is 146cm -1 The characteristic peaks show that it is 1T molybdenum disulfide. image 3 It is the SEM image of molybdenum disulfide nanosheets, the size of which is between 23.4nm and 41.1nm.

[0066] 2) The synthesized molybdenum disulfide nanos...

Embodiment 2

[0069] The present embodiment prepares a kind of nano drag reducing agent, comprises the following steps:

[0070] 1) Add 0.1g of molybdenum trioxide powder, 1g of sodium sulfide and 0.6g of hydrazine hydrate into 50mL of deionized water and stir for 30min; then pour the mixed solution into a hydrothermal reactor and react at 220°C for 6 hours. Then wash with deionized water to obtain molybdenum disulfide nanosheets.

[0071] 2) The synthesized molybdenum disulfide nanosheets and acrylamide were added into deionized water at a mass ratio of 1:1, ultrasonicated at room temperature for 30 min; then stirred at room temperature at 1000 rpm for 24 hours. Then wash with deionized water to remove unreacted acrylamide, and dry at 50°C to obtain molybdenum disulfide nanosheets with surface-modified functional groups.

[0072] 3) Add 0.1g of molybdenum disulfide nanosheets with surface-modified functional groups and 4g of acrylamide into a Shrek bottle, use deionized water as the react...

Embodiment 3

[0074] The present embodiment prepares a kind of nano drag reducing agent, comprises the following steps:

[0075] 1) Add 1g of molybdenum trioxide powder, 8g of thiourea, 3g of sodium sulfide and 10g of urea into 100mL of deionized water and stir for 30min; then pour the mixed solution into a hydrothermal reactor and react at 200°C for 10 hours. Then wash with deionized water to obtain molybdenum disulfide nanosheets.

[0076] 2) The synthesized molybdenum disulfide nanosheets and acrylamide were added into deionized water at a mass ratio of 1:1, ultrasonicated at room temperature for 30 min; then stirred at room temperature at 1000 rpm for 24 hours. Then wash with deionized water to remove unreacted acrylamide, and dry at 50°C to obtain molybdenum disulfide nanosheets with surface-modified functional groups.

[0077] 3) Add 1g of molybdenum disulfide nanosheets with surface-modified functional groups, 4g of acrylamide and 4g of acrylic acid into a Shrek bottle, use deionize...

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Abstract

The invention discloses a nano drag reducer, a preparation method thereof and a slick water fracturing fluid. The preparation method comprises the following steps: using acrylamide to modify the surface of molybdenum disulfide nanosheets to obtain molybdenum disulfide nanosheets with surface modification functional groups; Acrylamide-modified molybdenum disulfide nanosheets. In the present invention, after the surface of molybdenum disulfide is modified with functional groups, the surface is modified with polyacrylamide in the form of copolymerization, and polyacrylamide molecular chains are introduced into the surface of molybdenum disulfide to form a nano drag reducer. The drag reducer obtained by the preparation method of the invention has the advantages of shear resistance, salt resistance and good sand suspension.

Description

technical field [0001] The invention relates to the field of oil and gas field working fluids, in particular to a nano drag reducer, a preparation method thereof and slick water fracturing fluid. Background technique [0002] Shale gas reservoirs usually have the characteristics of ultra-low porosity, low permeability, small throat radius, and extremely low natural productivity. gas well production. When fracturing shale reservoirs, the fracturing fluid needs to enter the natural fractures of the formation. On the basis of forming a certain number of main fractures, more natural fractures are connected through its own filtration, thus forming a large number of highly communicating fractures. network to improve the seepage area of ​​the reservoir. Therefore, shale reservoir fracturing requires the use of volumetric fracturing with large fluid volume and displacement, and the slick water fracturing fluid system is the first choice. [0003] 98.0% to 99.5% of the slick water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/06C08F220/58C09K8/66C09K8/88C01G39/06B82Y40/00
CPCC08F292/00C09K8/66C09K8/88C01G39/06B82Y40/00C01P2004/20C01P2002/85C01P2004/03C08F220/56C08F220/06C08F220/585Y02T70/10
Inventor 周福建李根生姚二冬李源周志澎王旻周翠红
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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