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Influence of MoS? Nanosheet Size on Performance of Drilling Mud.

ABSTRACT: Water-based drilling mud (WBM) is a non-Newtonian fluid that has a variety of applications such as in transporting cuttings during drilling, protecting the borehole, and cooling the drill bit. With the development of nano-technology, various nanoparticles have been synthesized and have been added to WBM to improve its performance. Shear thinning is the most important factor in drilling mud and this attribute can be improved when two-dimensional particles are added. MoS? nanoparticles, which represent a typical two-dimensional material, are easy to synthesize in large quantities and have a high thermal conductivity and low coefficient of friction. Since the two-dimensional structure, thermal conductivity, and low coefficient of friction of MoS? would improve the performance of WBM, we experimented with MoS? nanosheets as an additive, under optimal conditions, using various samples each with uniform sizes and thicknesses of nanosheets. A large amount of MoS? nanosheets was synthesized, sorted by thickness and diameter, and added to drilling mud. The diameter of MoS? was divided into a small diameter group (about 100?400 nm) and a big diameter group (about 300?650 nm), and the thickness was divided into 1?2 nm and 5?10 nm groups. Experimental results showed that when MoS? is added to WBM, shear thinning occurs more strongly. In addition, the addition of MoS? with a thickness of 1?2 nm and a diameter of 300?650 nm resulted in the highest increase in viscosity and thermal conductivity of WBM. As a result, we experimentally confirmed that MoS? can be used as an additive to increase the thermal conductivity and viscosity of WBM and to make shear thinning phenomenon more.

SUBMITTER: Hong SH

PROVIDER: S-EPMC6419213 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Influence of MoS₂ Nanosheet Size on Performance of Drilling Mud.

Hong Sung Hyun SH Jo Hae Jin HJ Choi Min-Ju MJ Jang Ho Won HW Kim Young Ju YJ Hwang Wook Ryol WR Kim Soo Young SY

Polymers 20190213 2

Water-based drilling mud (WBM) is a non-Newtonian fluid that has a variety of applications such as in transporting cuttings during drilling, protecting the borehole, and cooling the drill bit. With the development of nano-technology, various nanoparticles have been synthesized and have been added to WBM to improve its performance. Shear thinning is the most important factor in drilling mud and this attribute can be improved when two-dimensional particles are added. MoS₂ nanoparticles, which repr ...[more]

PMID: 30960305

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Project description:Natural organic matter (NOM) present in surface water causes severe organic fouling of nanofiltration (NF) membranes employed for the production of potable water. Calcium (Ca2+) and magnesium (Mg2+) are alkaline earth metals present in natural surface water and severely exacerbate organic fouling owing to their ability to cause charge neutralization, complexation, and bridging of NOM and the membrane surface. Hence, it is of practical significance to engineer membranes with properties suitable for addressing organic fouling in the presence of these cations. This study employed OH-functionalized molybdenum disulphide (OH-MoS2) nanosheets as nanofillers via the interfacial polymerization reaction to engineer NF membranes for enhanced removal of NOM and fouling mitigation performance. At an optimized concentration of 0.010 wt.% of OH-MoS2 nanosheet, the membrane was endowed with higher hydrophilicity, negative charge and rougher membrane morphology which enhanced the pure water permeance by 46.33% from 11.2 to 16.39 L m-2 h-1 bar-1 while bridging the trade-off between permeance and salt selectivity. The fouling performance was evaluated using humic acid (HA) and sodium alginate (SA), which represent the hydrophobic and hydrophilic components of NOM in the presence of 0, 0.5, and 1 mM Ca2+ and Mg2+, respectively, and the performance was benchmarked with control and commercial membranes. The modified membrane exhibited normalized fluxes of 95.09% and 93.26% for HA and SA, respectively, at the end of the 6 h filtration experiments, compared to the control membrane at 89.71% and 74.25%, respectively. This study also revealed that Ca2+ has a more detrimental effect than Mg2+ on organic fouling and NOM removal. The engineered membrane outperformed the commercial and the pristine membranes during fouling tests in the presence of 1 mM Ca2+ and Mg2+ in the feed solution. In summary, this study has shown that incorporating OH-MoS2 nanosheets into membranes is a promising strategy for producing potable water from alternative water sources with high salt and NOM contents.

Dataset Information

Influence of MoS? Nanosheet Size on Performance of Drilling Mud.

Publications

Influence of MoS₂ Nanosheet Size on Performance of Drilling Mud.

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