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Wellbore stability analysis to determine the safe mud weight window for sandstone layers

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Petroleum Exploration and Development 2019年第5期46卷 1031-1038页

作者： DARVISHPOUR Ayoub CHERAGHI SEIFABAD masoud WOOD David Anthony GHORBANI Hamzeh Department of Mining Engineering Isfahan University of TechnologyIsfahan ***Iran DWA Energy Limited LincolnLN59JPUnited Kingdom Southern Oil Fields National Iranian Oil CompanyTeheran ***Iran

The wellbore stability of a vertical well through the sandstone reservoir layers of the Asmari oil-bearing formation in south-west Iran is *** safe drilling-fluid density range for maintaining wellbore stability is determined and simulated using FLAC3 D software and a finite volume model established with drilled strata geomechanical *** initiation of plastic condition is used to determine the safe mud weight window(SMWW)in specific sandstone *** effects of rock strength parameters,major stresses around the wellbore and pore pressure on the SMWW are investigated for this *** analysis reveals that a reduction in cohesion and internal friction angle values leads to a significant narrowing of the *** the other hand,the reduction of pore pressure and the ratio between maximum and minimum horizontal stresses causes the SMWW to widen *** ability to readily quantify changes in SMWW indicates that the developed model is suitable as a well planning and monitoring tool.

关键词： wellbore stability wellbore geomechanical property safe mud weight window wellbore instability risk factors drilling stress simulation

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Magnetic and optical properties of zinc chromite nanostructures prepared by microwave method

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 3980-3986页

作者： Zahra MOUSAVI Mahdiyeh ESMAEILI-ZARE masoud SALAVATI-NIASARI Institute of Nano Science and Nano Technology University of Kashan

The nanostructures of zinc chromite（Zn Cr2O4） were fabricated by the microwave method. It was shown that the well-crystallized spinel structure is formed after annealing at 700 °C. The influence of reaction time and irradiation power of oven on the size and shape of the as-prepared Zn Cr2O4 samples was studied. The synthesized samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, energy dispersive X-ray（EDX）, transmission electron microscopy（TEM）, diffuse reflectance spectroscopy（DRS）, photoluminescence（PL） spectroscopy, Fourier transform infrared（FTIR） spectra and vibrating sample magnetometry（VSM）, respectively. The optical band gap calculated using DRS was found to be 3.50 e V for Zn Cr2O4 nanostructures. Photoluminescence measurements also confirmed this result.

关键词： zinc chromite nanostructures superhydrophilicty magnetic property optical property

A critical review on the developments of rock support systems in high stress ground conditions

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International Journal of Mining Science and Technology 2020年第5期30卷 555-572页

作者： masoud Ghorbani Korosh Shahriar Mostafa Sharifzadeh Reza masoudi Department of Mining and Metallurgical Engineering Amirkabir University of TechnologyTehranIran Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyangLiaoning 110819China Department of Mining and Metallurgical Engineering Curtin UniversityKalgoorlieWA 6430Australia

Extreme ground behaviour in high-stress rock masses such as rockburst prone and squeezing ground conditions are encountered in a range of underground projects both in civil and mining *** occurrence of such ground behaviour types are difficult to predict and special design and construction measures must be taken to control *** the most appropriate support system in such grounds is one of the major challenges for ground control engineers because there are many contributing factors to be considered,such as the rock mass parameters,the stress condition,the type and performance of the support systems,the condition of major geological structures and the size and geometry of the underground *** main characteristics and support requirements of rockburst-prone and squeezing ground conditions are herein critically reviewed and characteristics of support functions are *** types of energy-absorbing rockbolts and other support elements applicable for ground support in burst-prone and squeezing grounds are *** differences in the choice and economics of ground support strategies in high-stress ground conditions between civil tunnels and mining excavations are *** support benchmarking data and mitigation measures for mines and civil tunnels in burst-prone,squeezing and heavily swelling grounds conditions are briefly presented by some examples in practice.

关键词： High in-situ stress Rockburst Squeezing Swelling Energy-absorbing rockbolts Yielding supports

An experimental comparison of water based alumina and silica nanofluids heat transfer in laminar flow regime

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Journal of Central South University 2013年第12期20卷 3582-3588页

作者： Azari Ahmad Kalbasi Mansour Derakhshandeh masoud Depertment of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus

Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the addition of small amounts of nano-sized Al2O3 particles to the base fluid increases heat transfer coefficients considerably, while the result for the silica nanofluids contradicts with the alumina nanofluids and this leads to some interesting results. In the case of alumina nanofluids, an average increase of 16% in convective heat transfer coefficient is observed with an average penalty of 28% in pressure drop. Moreover, flow resistance increases significantly compared to the base fluid even at very low concentrations of nanofluids. Finally, measured heat transfer coefficients are compared with predicted ones from the correlation of Shah under the same conditions.

关键词： convection forced convection heat transfer nano scale heat transfer

HIF-1α pathway: role, regulation and intervention for cancer therapy

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Acta Pharmaceutica Sinica B 2015年第5期5卷 378-389页

作者： Georgina N.masoud Wei Li Department of Pharmaceutical Sciences College of Pharmacy the University of Tennessee Health Science Center

Hypoxia-inducible factor-1 (HIF-1) has been recognized as an important cancer drug target. Many recent studies have provided convincing evidences of strong correlation between elevated levels of HIF-1 and tumor metastasis, angiogenesis, poor patient prognosis as well as tumor resistance therapy. It was found that hypoxia (low O2 levels) is a common character in many types of solid tumors. As an adaptive response to hypoxic stress, hypoxic tumor cells activate several survival pathways to carry out their essential biological processes in different ways compared with normal cells. Recent advances in cancer biology at the cellular and molecular levels highlighted the HIF-1α pathway as a crucial survival pathway for which novel strategies of cancer therapy could be developed. However, targeting the HIF-1α pathway has been a challenging but promising progresses have been made in the past twenty years. This review summarizes the role and regulation of the HIF-1α in cancer, and recent therapeutic approaches targeting this important pathway.

关键词： HIF-1α HIF-1α inhibitors Cancer drug discovery and development

Ultra-Compact Photonic Crystal Based Water Temperature Sensor

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Photonic Sensors 2016年第3期6卷 274-278页

作者： Mahmoud NIKOUFARD masoud KAZEMI ALAMOUTI Alireza ADEL Department of Electronics Faculty of Electrical and Computer Engineering University of Kashan Kashan Iran

We design an ultra-compact water temperature sensor by using the photonic crystal technology on the InP substrate at the 1.55-μm wavelength window. The photonic crystal consists of rods in a hexagonal lattice and a polymethyl methacrylate （PMMA） background. By using the plane wave expansion （PWE） method, the lattice constant and radius of rods are obtained, 520nm and 80.6nm, respectively. With a nanocavity placed in the waveguide, a resonance peak is observed at the 1.55-μm wavelength window. Any change of the water temperature inside the nanocavity results in the shift of the resonance wavelength. Our simulations show a shift of about 11 nm for a temperature change of 22.5 ℃. The resonance wavelength has a linear relation with the water temperature.

关键词： Sensor water temperature InGaAsP material photonic crystal

Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines

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Petroleum Science 2019年第6期16卷 1361-1373页

作者： Ehsan Ghandi Rafat Parsaei masoud Riazi Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteSchool of Chemical and Petroleum EngineeringShiraz UniversityShirazIran Department of Petroleum Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

Most fractured carbonate oil reservoirs have oil-wet ***,the process of imbibing water from the fractures into the matrix is usually poor or basically does not exist due to negative capillary *** achieve appropriate ultimate oil recovery in these reservoirs,a water-based enhanced oil recovery method must be capable of altering the wettability of matrix *** studies showed that carbonated water can alter wettability of carbonate oil-wet rocks toward less oil-wet or neutral wettability conditions,but the degree of modification is not high enough to allow water to imbibe spontaneously into the matrix blocks at an effective *** this study,we manipulated carbonated brine chemistry to enhance its wettability alteration features and hence to improve water imbibition rate and ultimate oil recovery upon spontaneous imbibition in dolomite ***,the contact angle and interfacial tension(IFT)of brine/crude oil systems were measured for several synthetic brine samples with different ***,two solutions with a significant difference in WAI(wettability alteration index)but approximately equal brine/oil IFT were chosen for spontaneous imbibition *** the next step,spontaneous imbibition experiments at ambient and high pressures were conducted to evaluate the ability of carbonated smart water in enhancing the spontaneous imbibition rate and ultimate oil recovery in dolomite *** results showed that an appropriate adjustment of the imbibition brine(i.e.,carbonated smart water)chemistry improves imbibition rate of carbonated water in oil-wet dolomite rocks as well as the ultimate oil recovery.

关键词： Spontaneous imbibition Carbonated smart water Wettability alteration Enhanced oil recovery Dolomite rocks

Square wave voltammetric quantification of folic acid,uric acid and ascorbic acid in biological matrix

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Journal of Pharmaceutical Analysis 2017年第2期7卷 110-117页

作者： Majid Arvand Akram Pourhabib masoud Giahi Electroanalytical Chemistry Laboratory Faculty of ScienceUniversity of GuilanNamjooStreetP.O.Box:1914RashtIran Education Organization of Guilan Province Farhang SquareP.O.Box:41849-83111RashtIran Department of Chemistry Faculty of ScienceLahijan BranchIslamic Azad UniversityP.O.Box:1616LahijanIran

Nowadays, modified electrodes with metal nanoparticles have appeared as an alternative for the electroanalysis of various compounds. In this study, gold nanoparticles（GNPs） were chosen as interesting metal nanoparticles for modifying carbon paste electrode（CPE）. GNPs and the gold nanoparticles-modified carbon paste electrode（GNPs/CPE） were characterized by UV–Vis spectroscopy, transmission electron microscopy（TEM） and scanning electron microscopy（SEM）. GNPs/CPE as a simple and sensitive electrode was used to study three important biological molecules： folic acid（FA）, uric acid（UA） and ascorbic acid（AA）. Square wave voltammetry（SWV） was used as an accurate technique for quantitative measurements. A good linear relation was observed between anodic peak current（ipa） and FA（5.2 × 10（-6）– 2.5 × 10（-5）M）, UA（1.2 × 10（-6）– 2.1 × 10（-5）M） and AA（1.2 × 10（-6）– 2.5 × 10（-5）M） concentrations in simultaneous determination of these molecules.

关键词： Ascorbic acid Folic acid gold nanoparticles-modified carbon paste electrode Simultaneous determination Uric acid

Analgesic and anti-inflammatory properties of hydroalcoholic extracts of Malva sylvestris, Carum carvi or Medicago sativa, and their combination in a rat model

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Journal of Integrative Medicine 2020年第2期18卷 181-188页

作者： masoud Seddighfar Sayid Mahdi Mirghazanfari Masoumeh Dadpay Department of Physiology and Iranian Medicine School of MedicineAJA University of Medical SciencesTehran ***Iran Department of Animal Biology School of BiologyCollege of ScienceUniversity of TehranTehran ***Iran Department of Pathology School of MedicineAJA University of Medical SciencesTehran ***Iran

Objective: The aim of this study was to evaluate the analgesic and anti-inflammatory effects of the hydroalcoholic extracts of Malva sylvestris flowers or Carum carvi and Medicago sativa seeds, alone and in combination, which have been used in traditional Iranian ***: Male Wistar rats were divided into 6 treatment groups: distilled water, sodium salicylate(SS),M. sylvestris extract(600 mg/kg), C. carvi extract(600 mg/kg), M. sativa extract(300 mg/kg) and combined extract(including 300 mg/kg M. sylvestris and C. carvi extracts, and 150 mg/kg M. sativa extract). The formalin pain model was used to evaluate the antinociceptive effects of the treatments. For anti-inflammatory effect, acute(one hour after injection) and chronic(during a week after injection)paw inflammation was measured after subcutaneous injection of 2.5% formalin in the ***, tissue samples from all groups were prepared for histopathological ***: The combined extract significantly inhibited the nociception in the acute phase of the formalin test(P < 0.001). In the chronic phase, all the extracts and SS had significant analgesic effect(P < 0.001).Analgesic activity of the combined extract was significantly stronger than SS(P < 0.01). In the acute inflammation model, M. sylvestris, C. carvi and the combined drug had significant inhibitory effects against paw edema(P < 0.05). All extracts, individually and in combination, significantly alleviated chronic paw inflammation(P < 0.01). The combined extract had much more anti-inflammatory activity than SS(P < 0.05). Histopathological results indicated improvement and reduction of inflammatory factors in the treatment ***: M. sylvestris, C. carvi and M. sativa have analgesic and anti-inflammatory ***, each of these extracts or a mixture of them might be a valuable alternative drug to control pain and inflammation.

关键词： Analgesic Anti-inflammatory Formalin test Malva sylvestris Carum carvi Medicago sativa