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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

672
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Preparation of MOF-Based Core-Shell Gel Particles with Catalytic Activity and Their Plugging Performance.

Fengbao Liu1, Jinsheng Sun1, Xiao Luo2

  • 1School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.

Gels (Basel, Switzerland)
|January 20, 2023
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Summary
This summary is machine-generated.

Novel core-shell gel particles enhance drilling fluid performance in deep wells. These modified ZIF particles improve long-term plugging, preventing borehole instability and accidents in high-temperature environments.

Keywords:
core-shell gel particlesmetal-organic framework materialsmolecular sieve catalytic activitynanoscale crystalsplugging

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Area of Science:

  • Materials Science
  • Petroleum Engineering
  • Nanotechnology

Background:

  • Deep and ultra-deep well drilling faces challenges from high temperatures and long operational cycles.
  • Failure of conventional gel particle-plugging agents leads to borehole instability and potential downhole accidents.
  • Existing plugging agents lack durable and stable performance under harsh downhole conditions.

Purpose of the Study:

  • To develop novel core-shell gel particles for enhanced long-term plugging performance in drilling fluids.
  • To improve the stability and durability of plugging agents in high-temperature downhole environments.
  • To mitigate borehole instability and prevent accidents in deep and ultra-deep wells.

Main Methods:

  • Fabrication of core-shell gel particles using ZIF-8 (metal-organic framework) as the core and organosilicon-modified polyethylene polyamine (PEPA) as the shell.
  • Utilizing PEPA and (3-aminopropyl) triethoxysilane (APTS) in the synthesis process.
  • Characterization of modified ZIF particles for their nanoscale polygonal crystal structure, micropores, and mesopores.

Main Results:

  • The modified ZIF particles exhibit characteristics of both rigid and flexible plugging agents.
  • These particles possess high molecular sieve catalytic activity due to their porous structure.
  • Modified ZIF demonstrated excellent catalytic cross-linking with sulfonated phenolic resin (SMP-3) and sulfonated lignite resin (SPNH) in drilling fluids.
  • Formation of a particle-gel composite plugging structure, significantly enhancing long-term plugging performance.

Conclusions:

  • The novel core-shell modified ZIF particles offer superior long-term plugging performance compared to conventional agents.
  • The unique structure and catalytic activity of modified ZIF enable effective cross-linking and gel formation.
  • This advancement contributes to improved borehole stability and operational safety in challenging deep well drilling conditions.