Volume 39 Issue 1
May  2022
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CHEN Lili, GUO Jianhua, XIE Gang.Study on mechanisms of carbon nanotube as a nanosized plugging agent in water based drilling fluids [J]. Drilling Fluid & Completion Fluid,2022, 39(1):29-35 doi: 10.12358/j.issn.1001-5620.2022.01.005
Citation: CHEN Lili, GUO Jianhua, XIE Gang.Study on mechanisms of carbon nanotube as a nanosized plugging agent in water based drilling fluids [J]. Drilling Fluid & Completion Fluid,2022, 39(1):29-35 doi: 10.12358/j.issn.1001-5620.2022.01.005

Study on Mechanisms of Carbon Nanotube as a Nanosized Plugging Agent in Water Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2022.01.005
  • Received Date: 2021-09-05
  • Accepted Date: 2021-10-25
  • Rev Recd Date: 2021-10-15
  • Publish Date: 2022-05-06
  • Micron-scale plugging agents are unable to effectively plug the nanosized fractures. To overcome this problem, aminated multi-walled carbon nanotubes were selected as the nanosized plugging agent. The effects of the aminated multi-walled carbon nanotubes on the rheology of drilling fluids were studied using the micron-scale ultrafine CaCO3 as a comparison. The plugging mechanism of the aminated multi-walled carbon nanotubes was studied through filtration test on artificial mud cakes and osmosis experiment on artificial cores. The study results showed that the carbon nanotube has almost no effect on the rheological parameters of the drilling fluid, and addition of ultra-fine CaCO3 into the drilling fluid made its rheology deteriorated. Plugging of the artificial mud cakes with the aminated multi-walled carbon nanotube becomes improved with the increase in the amount of the nanotubes added. When the concentration of the aminated multi-walled carbon nanotube was 3%, 77.70% of the mud cakes can be plugged, while the addition of the same concentration of ultra-fine CaCO3 only plugged 45.28% of the artificial mud cakes. Experiment on artificial cores showed that at a concentration of 3% aminated multi-walled carbon nanotube, the core was plugged by 79.41%, while at a concentration of 3% ultra-fine CaCO3, the core was plugged only by 61.76%. These experimental results fully demonstrate that the nanosized plugging agents are much better than micron-scale plugging agents in terms of plugging; the calcium carbonate can only accumulate on the face of a fractured surface, while the aminated multi-walled carbon nanotube can penetrate into the nanosized fractures and form bridges therein. By tightly adsorbing on the surfaces inside the fractures with the amino groups, the aminated multi-walled carbon nanotube prevents the filtrate from going into the fractures.

     

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