Materials synthesize and production
A. Ebrahim Pourshayan; A. Rabbani; S. farahani; Y. Rabbani; H. Ahmadi Danesh Ashtian; M. shariat; Gh. Nejad; A. A. Emami Satellou
Abstract
Magnetorheological fluids contain suspended magnetic particles that arrange in chains in the presence of a magnetic field, causing the conversion of the fluid from a liquid state to a quasi-solid state. These fluids can be used in valves as a tool for pressure drop and flow interruption. This research ...
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Magnetorheological fluids contain suspended magnetic particles that arrange in chains in the presence of a magnetic field, causing the conversion of the fluid from a liquid state to a quasi-solid state. These fluids can be used in valves as a tool for pressure drop and flow interruption. This research aims to investigate the feasibility of using magnetorheological fluid (MRF) in industrial valves. The rheological properties of the MRF sample were measured with the MCR300 rheometer in the presence of a magnetic field. In this connection, the Bingham plastic continuous model was used to predict fluid behavior, and model coefficients were obtained using MATLAB software. Then, the model's coefficients were used to simulate the behavior of the magnetorheological fluid in the presence of the magnetic field in the valve. The geometry and dimensions of the valve were designed according to the dimensions of industrial samples. Then the CFD simulation with Fluent software was done by using the Bingham model and fluid characteristics obtained from experimental results. The results showed that the pressure increased by increasing the magnetic field at the center of the sleeve. The magnetic field up to 0.5 Tesla, increases pressure and decreases amplitude. Therefore, as the magnetic field increase, the amplitude of the maximum pressure on the sleeve was significantly reduced.
Petroleum and Reservoir Engineering
A. Arinkoola; T. Salawudeen; K. Salam; M. Jimoh; Z. Atitebi; G. Abidemi
Volume 16, Issue 1 , March 2019, , Pages 39-53
Abstract
Research has shown that many Bentonite in Nigeria are unsuitable for oil well drilling in their natural states. Their modification and blends with some additives could increase the yield and boost their suitability. Many indigenous polymers have become very popular due to environmental friendliness and ...
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Research has shown that many Bentonite in Nigeria are unsuitable for oil well drilling in their natural states. Their modification and blends with some additives could increase the yield and boost their suitability. Many indigenous polymers have become very popular due to environmental friendliness and their ability to modify rheology of clay suspension. However, the common natural polymers are characterized with excessive fluid loss, low gel strength at typical reservoir conditions. The aim of this study is therefore to examine the influence of selected polymers on the physicochemical and rheological properties of Nigerian clay-water suspension. Mud samples were prepared with polymers according to mud formulations currently used in the wells drilling with properties varied and optimized in a Reduced Central Composite Design (RCCD). The physico-chemical (pH, mud weight), rheological (plastic viscosity, yield point) and fluid loss were measured out on the studied muds. The results show that, the rheological characteristics of studied muds (PV (19.4 ± 1.50 cp) and Yp (21.5 ± 0.79 lbf/100ft2), the Fluid loss (10.12 ± 0.45 ml/30 minutes/100 psi) and 10 min and sec Gel value (4.6 ± 0.05 and 5.1 ± 0.01 lb/100ft2) were clearly improved. However, the mud weight values recorded (8.6 – 8.9 lb) though satisfied the minimum 8.6 lb/gal ceiling value but was due to the local barite that this study evaluated. The barite is characterized with low specific gravity and we recommend its modification prior to use to avoid high sand content.
Polymer Engineering and Technology,
R. Foruzanfar; j. aalaie; H. Hamidian; M. Dehestani
Volume 14, Issue 3 , August 2017, , Pages 41-54
Abstract
Due to the importance of nanoparticles stability in industrial applications, in this research, stability of laponite nanoparticles dispersions containing different concentrations of sodium sulfonated polyacrylamide (SPA) was investigated in electrolyte media for oil reservoirs applications. In this regard, ...
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Due to the importance of nanoparticles stability in industrial applications, in this research, stability of laponite nanoparticles dispersions containing different concentrations of sodium sulfonated polyacrylamide (SPA) was investigated in electrolyte media for oil reservoirs applications. In this regard, effect of parameters such as polymer concentration, temperature, and ionic strength were studied via different methods such as Fourier transform infrared (FT-IR) spectroscopy, dynamic light scattering (DLS) and zeta potential. In FT-IR spectra of SPA-laponite dispersion, in addition to typical peaks of laponite, there was a weak peak at 1040cm-1 characterizing SPA polymer. The z-average particle sizes of laponite particles increased after 168 h of aging in presence of SPA polymer. Zeta potential measurements showed that, adsorption of anionic groups of polymer on particle surface during the aging process has led to a decrease in zeta potential value (toward more negative values). It was seen that dispersion stability depended on polymer concentration, ionic strength of aqueous media, and temperature. Visual observations showed that the stability of laponite nanoparticles in electrolyte media was improved by increasing the SPA polymer concentration. The rheological studies showed that the viscosity curves of SPA-laponite dispersions were located below those of the corresponding pure SPA polymer solutions. Consequently, particle settling was hindered by increasing the polymeric matrix viscosity. Furthermore, using a power-law equation fitted to the polymer solution viscosity-shear rate data, it was shown that laponite nanoparticles stability in electrolyte media could be improved by decreasing the power-law coefficient.