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Thermal oil recovery factors from sandpacks of variable mineralogy

Petroleum Research 2023年第4期8卷 481-489页

作者： Viacheslau Y.Kudrashou hisham A.nasr-el-din Slippery Rock University United States Texas A&M University United States

S Steam injection is commonly used for production of viscous crude *** rock often contains clay *** nature of steam and clay minerals may lead to formation *** work in-vestigates oil recovery and changes in petrophysical properties as a function of the ***-packs with quartz,calcite,feldspar,kaolinite,smectite,and illite were prepared for steam injection *** of the steamed sandpacks was determined using coreflood *** composition of the produced aqueous samples was determined using ICP-OES(inductively coupled plasma-optical emission spectroscopy).Morphology of the rock samples was studied using SEM-EDs(scanning electron microscope-energy dispersive X-ray spectroscopy).Mineralogy and elemental content of the solid samples were determined using XRD(X-ray diffraction)analysis and XRF(X-ray fluorescence)*** was found that aqueous phase samples produced from clay-rich sandpacks tend to have higher pH than samples produced from samples without clay *** recovery factors for 100%quartz case was determined to be 65 wt%.Calcite-and feldspar-rich sandpacks produced 56 and 61 wt%of oil *** with clay fractions have shown the lowest oil recovery-39,29,and 28 wt%for kaolinite-,smectite-,and illite-rich samples *** dissolution and pre-cipitation were the dominant damaging mechanism for quartz and calcite ***-rich sandpack demonstrated signs of structural destruction of the mineral and fines ***'s effect on oil recovery was found to be associated with fines *** hydration and swelling in presence of steam was the dominant formation damage effect on the oil *** interaction with illite-rich sandpack caused formation of amorphous *** paper presents oil recovery factors as a function of injected pore volume(PV)of steam for sandpacks of different *** results characterize petroph

关键词： Steam injection Oilrecovery Kaolinite Smectite Ilite Sandpack

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New insights into hydraulic fracturing fluids used for hightemperature wells

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Petroleum 2021年第1期7卷 70-79页

作者： Tariq Almubarak Leiming Li Jun Hong Ng hisham nasr-el-din Mohammed AlKhaldi Texas A&M University USA Aramco Services Company Saudi Arabia Saudi Aramco EXPEC ARC Saudi Arabia

Current interest in deep,low-permeability formations(<10 md)demands accelerated development of high-temperature hydraulic fracturing *** guar systems break down above 300°F and require higher polymer loadings to main... 详细信息

Current interest in deep,low-permeability formations(elerated development of high-temperature hydraulic fracturing *** guar systems break down above 300°F and require higher polymer loadings to maintain thermal ***,higher polymer loadings generate more residue and damage to the proppant pack and the *** resolve these problems,a variety of high-temperature stabilizers are added to enhance the thermal stability of these fracturing fluids at temperatures above 300*** focus of this work is to:(1)identify those additives that best enhance temperature stability of fracturing fluids and(2)study the rheological influence of incorporating these additives on the fracturing fluid *** experimental fracturing-fluid solutions were prepared at a total polymer concentration of 30 and 40 lb/1000 *** such as synthetic polymer,oxygen scavengers,crosslinkers,crosslinker delay additives,and pH buffers were examined in this *** polymer solutions were crosslinked with a metallic crosslinker between 200 and 400°*** measurements were carried out in a highpressure/high-temperature(HP/HT)rheometer to evaluate rheology and thermal *** show that adding a synthetic polymer and a crosslinker with the slowest reaction rate improves the fracturing fluid thermal *** the three other additives tested,oxygen scavengers showed the greatest enhancement to thermal stability while pH buffers showed the *** the addition of high-temperature stabilizing additives,the fracturing fluid in this work was able to maintain a stable performance at temperatures up to 400°*** the thermal stability of fracturing fluids at a lower polymer loading remains a challenge in the *** work proposes techniques that can be used to enhance the thermal stability of fracturing *** knowledge about these different techniques will allow for better additive development and a

关键词： Oxygen scavenger Crosslinker Crosslinker delay Shear tolerance High temperature Synthetic polymer CMHPG Buffers

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Facies Analysis and Biostratigraphy of the Miocene Sequence,Cairo-Suez District,Egypt

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Journal of Earth Science 2017年第1期28卷 1-8页

作者： Abdelbaset el-Sorogy Mohamed Abd-elmoneim Ahmed Mowafi Khaled Al-Kahtany hisham Gahlan Department of Geology and Geophysics College of Science King Saud University Riyadh 11451 Saudi Arabia Geology Department Faculty of Science Zagazig University Zagazig 44519 Egypt

Miocene siliciclastic-carbonate deposits are widely exposed in Cairo-Suez District, Egypt. These deposits are underlain and overlain by continental sediments of Oligocene and post Miocene, respectively. Three stratigraphic sections were investigated at Gabals Geneife, Homeira and Gharra. Lithostrtigraphically, the Miocene sequence could be differentiated into two main rock units representing shallow deposits with relatively intermittent deep marine incursions. These are from base to top, Gharra Formation and Genefe Formation. Detailed macrofossils investigations led to the recognition of four macrofossil zones, namely Alectryonella plicatula-Crassostrea frondosa Range Zone, Echinolampas amplus-Scutella ammonis Range Zone, Chlamys（Macrochlamys） sardoa-Chlamys（Argopecten） submalvinae Range Zone, and Chlamys gentoni-Pecten（Oppenheimopecten） benedictus-Pecten（P.） ziziniae Assemblage Zone. Microfacies analysis and identified taxa indicated that the Miocene sequence was deposited in transgressive-regressive cycles ranged from near shore, warm shallow inner to middle shelf marine environments with storm influence during the accumulation of the oyster banks.

关键词： facies analysis biostratigraphy Miocene Cairo-Suez District Egypt.

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Production of geopolymer composites enhanced by nano‐kaolin material

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Journal of Advanced Ceramics 2015年第4期4卷 245-252页

作者： Mahmoud M.HASSAAN hisham M.KHATER Medhat S.el-MAHLLAWY Abdeen M.el NAGAR Al Azhar University Nasr CityCairoEgypt Housing and Building National Research Centre(HBRC) 87 El-Tahrir St.DokkiGizaP.O.Box 1770CairoEgypt

Nowadays kaolin raw material is usually used to produce nano-kaolin for geopolymer enhancement by using firing *** the present study,kaolin used was taken from the Naqus Formation(Cambro-Ordovician age),west of Gabal el Gunna,Sinai,***-kaolin material is an ultrafine material and was prepared from the taken kaolin by the firing process at 800 for 2℃h with a heating rate of 5/*** mixes were prepared and their laboratory specimens were made℃and cured up to 90 *** cooled slag was used as starting material,and sodium hydroxide and sodium silicate were used in the study as activators for the used *** formed geopolymer mixes with different ratios(1%,1.5%,3%,5%,and 7%)of nano-kaolin as a partial replacement for the raw kaolin were *** Ace super plasticizer was added in the ratio of 4%from the dry weight to ensure good dispersing of the used nano *** showed that increasing the percentage of nano-kaolin up to 3%results in an enhancement in the mechanical properties as compared with the control mix up to 90 days of curing,while higher ratios are not preferable where they lead to agglomeration of the added nano materials and matrix dilution.

关键词： geopolymer nano-kaolin sodium silicate slag

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Barrett's esophagus:Prevalence and risk factors in patients with chronic GERD in Upper Egypt

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World Journal of Gastroenterology 2009年第28期15卷 3511-3515页

作者： Yasser M Fouad Madiha M Makhlouf Heba M Tawfik Hussein el Amin Wael Abdel Ghany hisham R el-khayat Department of Tropical Medicine and Gastroenterology Minya University Department of Pathology Minya University Department of Internal Medicine Gastroenterology Unit Assuit University Department of Gastroenterology Theodore Bilharz Research Institute

AIM： To determine the prevalence and possible risk factors of Barrett＇s esophagus （BE） in patients with chronic gastroesophageal reflux disease （GERD） in EI Minya and Assuit, Upper Egypt. METHODS： One thousand consecutive patients with chronic GERD symptoms were included in the study over 2 years. They were subjected to history taking including a questionnaire for GERD symptoms, clinical examination and upper digestive tract endoscopy. Endoscopic signs suggestive of columnar-lined esophagus （CLE） were defined as mucosal tongues or an upward shift of the squamocolumnar junction. BF was diagnosed by pathological examination when specialized intestinal metaplasia was detected histologically in suspected CLE. pH was monitored in 40 patients. RESULTS： BE was present in 7.3% of patients with chronic GERD symptoms, with a mean age of 48.3 ± 8.2 years, which was significantly higher than patients with GERD without BE （37.4 ± 13.6 years）. Adenocarcinoma was detected in eight cases （0.8%）, six of them in BE patients. There was no significant difference between patients with BE and GERD regarding sex, smoking, alcohol consumption or symptoms of GERD. Patients with BE had significantly longer esophageal acid exposure time in the supine position, measured by pH monitoring. CONCLUSION： The prevalence of BE in patients with GERD who were referred for endoscopy was 7.3%. BE seems to be associated with older age and more in patients with nocturnal gastroesophageal reflux.

关键词： Barrett's esophagus Gastrointestinal Endoscopy Gastroesophageal reflux Risk factors

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Employing adaptive fuzzy computing for RCP intelligent control and fault diagnosis

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Nuclear Science and Techniques 2023年第9期34卷 82-93页

作者： Ashraf Aboshosha hisham A.Hamad Rad.Eng.Department NCRRTEgyptian Atomic Energy Authority(EAEA)CairoEgypt electronics Technology Department Faculty of Technology and EducationHelwan UniversityCairoEgypt

Loss of coolant accident(LOCA),loss of fluid accident(LOFA),and loss of vacuum accident(LOVA)are the most severe accidents that can occur in nuclear power reactors(NPRs).These accidents occur when the reactor loses its cooling media,leading to uncontrolled chain reactions akin to a nuclear *** article is focused on exploring methods to prevent such accidents and ensure that the reactor cooling system remains fully *** reactor coolant pump(RCP)has a pivotal role in facilitating heat exchange between the primary cycle,which is connected to the reactor core,and the secondary cycle associated with the steam ***,the RCP is integral to preventing catastrophic events such as LOCA,LOFA,and LOVA *** this study,we discuss the most critical aspects related to the RCP,specifically focusing on RCP control and RCP fault *** AI-based adaptive fuzzy method is used to regulate the RCP’s speed and torque,whereas the neural fault diagnosis system(NFDS)is implemented for alarm signaling and fault diagnosis in nuclear *** address the limitations of linguistic and statistical intelligence approaches,an integration of the statistical approach with fuzzy logic has been *** integrated system leverages the strengths of both *** fuzzy control was applied to the VVER 1200 NPR-RCP induction motor,and the NFDS was implemented on the Kori-2 NPR-RCP.

关键词： Nuclear power plant(NPP) Reactor coolant pump Fault diagnosis Reactor passive safety Neural network Adaptive fuzzy

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Intensive care unit readmission in adult Egyptian patients undergoing living donor liver transplant:A single-centre retrospective cohort study

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World Journal of Hepatology 2022年第6期14卷 1150-1161页

作者： Manar Salah Iman Fawzy Montasser Hanaa A el Gendy Alaa A Korraa Gamal M elewa Hany Dabbous Hossam R Mahfouz Mostafa Abdelrahman Mohammed hisham Goda Mohamed Mohamed Bahaa el-din Mahmoud el-Meteini Heba A Labib Department of Tropical Medicine Ain Shams Center for Organ TransplantationAin Shams UniversityCairo 11566Egypt Department of Anaesthesia and Critical Care Ain Shams Centre for Organ TransplantationAin Shams UniversityCairo 11566Egypt Department of General Surgery and Liver Transplantation Ain Shams Centre for Organ TransplantationAin Shams UniversityCairo 11566Egypt

BACKGROUND Patients who undergo living donor liver transplantation(LDLT)may suffer complications that require intensive care unit(ICU)*** To identify the incidence,causes,and outcomes of ICU readmission after *** A retrospective cohort study was conducted on patients who underwent *** collected data included patient demographics,preoperative characteristics,intraoperative details;postoperative stay,complications,causes of ICU readmission,and *** were divided into two groups according to ICU readmission after hospital *** factors for ICU readmission were identified in univariate and multivariate *** The present study included 299 ***-one(10.4%)patients were readmitted to the ICU after *** who were readmitted to the ICU were older in age(53.0±5.1 vs 49.4±8.8,P=0.001)and had a significantly higher percentage of women(29%vs 13.4%,P=0.032),diabetics(41.9%vs 24.6%,P=0.039),hypertensives(22.6%vs 6.3%,P=0.006),and renal(6.5%vs 0%,P=0.010)patients as well as a significantly longer initial ICU stay(6 vs 4 d,respectively,Pelp provide optimal care and tailor follow-up to reduce the rate of ICU readmission.

关键词： Intensive care units Liver transplantation Patient readmission Risk factors

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The vitreomacular interface in different types of agerelated macular degeneration

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International Journal of Ophthalmology(English edition) 2017年第2期10卷 246-253页

作者： Mohamed Abd elM onaem el-Hifnawy hisham Ali Ibrahim Amir Ramadan Gomaa Mohamed A elmasry Ophthalmology Department Alexandria University Faculty of MedicineKhartoum SquareAzaritaAlexandria 21526Egypt

AIM： To evaluate the vitreomacular interface in cases with wet age-related macular degeneration（AMD） and to compare them to eyes with dry AMD and normal ***： This was a cross-sectional comparative study that included 87 eyes with wet AMD,42 eyes with dry AMD and 40 eyes without AMD as a control *** coherence tomography（OCT） examination was performed for all patients to assess the vitreomacular ***： In the wet AMD group,34.5% of cases had vitreomacular adhesion（VMA）.Only 14.3% of dry AMD cases and 10% of control cases had *** was a significant difference between the control group and the wet AMD group（P=0.004） as well as the dry and wet AMD group（P=0.017）.There was also a significant difference between the incidence of VMA in patients with subretinal choroidal neovascularization（CNV,type 1） and intraretinal CNV（type 2 or type 3）（P=0.020）.CONCLUSION： There is an association between posterior vitreous attachment and *** is also an increased incidence of VMA with intra-retinal CNV.

关键词： age-related macular degeneration vitreomacular interface optical coherence tomography macula

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Autonomic dysreflexia: a cardiovascular disorder following spinal cord injury

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Neural Regeneration Research 2017年第9期12卷 1390-1400页

作者： hisham Sharif Shaoping Hou Spinal Cord Research Center Department of Neurobiology and Anatomy Drexel University College of Medicine

Autonomic dysreflexia （AD） is a serious cardiovascular disorder in patients with spinal cord injury （SCI）. The primary underlying cause of AD is loss of supraspinal control over sympathetic preganglionic neurons （SPNs） caudal to the injury, which renders the SPNs hyper-responsive to stimulation. Central maladaptive plasticity, including C-fiber sprouting and propriospinal fiber proliferation exaggerates noxious afferent transmission to the SPNs, causing them to release massive sympathetic discharges that result in severe hypertensive episodes. In parallel, upregulated peripheral vascular sensitivity following SCI exacerbates the hypertensive response by augmenting gastric and pelvic vasoconstriction. Currently, the majority of clinically employed treatments for AD involve anti-hypertensive medications and Botox injections to the bladder. Although these approaches mitigate the severity of AD, they only yield transient effects and target the effector organs, rather than addressing the primary issue of central sympathetic dysregulation. As such, strategies that aim to restore supraspinal reinnervation of SPNs to improve cardiovascular sympathetic regulation are likely more effective for AD. Recent pre-clinical investigations show that cell transplantation therapy is efficacious in reestablishing spinal sympathetic connections and improving hemodynamic per- formance, which holds promise as a potential therapeutic approach.

关键词： autonomic dysreflexia hyper-reflexia sympathetic dysfunction C-fibers propriospinal axons a-adrenoceptors stem cell transplantation

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A Clinic-Epidemilogical Study of Cases of Locally Advanced Non Small Cell Lung Cancer (NSCLC) That Received Radiotherapy at NCI Cairo in the Period from 2001-2010

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Journal of Cancer Therapy 2014年第6期5卷 542-551页

作者： Mohamed Lotayef Azza Taher Hanna Attia Azza nasr hisham el Hossieny Mohammed Mahmoud Noha Essam Clinical Oncology Department Faculty of medicine Cairo University Cairo Egypt Radiation Oncology Department National Cancer Institute Cairo University Cairo Egypt

Purpose: This work was to study the clinic-epidemiological characteristics of patients with locally advanced NCSLC and to analyze their prognostic factors and also the results of different treatment modalities for local control and their effect on overall survival (OAS). Materials and Methods: This is a retrospective study including 121 patients with primary locally advanced NSCLC diagnosed between 2001 and 2010 at the radiotherapy department , National Cancer Institute, Cairo University, Egypt. Results: The study showed significant correlation between the tumor size 60, moderately differentiated tumors G2 and treatment outcomes;better locoregional control and better survival rates. On the opposite side poorly differentiated tumors G3, tumor size > 7 cm had the worst locoregional control and survival rates. The study also showed significant statistical correlation between treatment modality, locoregional control and survival rates. Patients who were treated by either concommitent chemo-radiotherapy or sequential chemo-radiotherapy had better local control compared to other patients who were treated by radical radiotherapy, and they also had the best survival rates among all the other treatment groups. The average 6 months OAS rates for all studied patients were 60.3% while 12 months survival rates were 38.8%. The median OAS was 7 months. Conclusions: From the present study, we concluded that concomitant chemo-radiotherapy is the treatment of choice for locally advanced non small cell lung cancer;also we concluded that better performance status and higher hemoglobin levels have better treatment outcome in these cases.

关键词： Non Small Cell Lung Cancer Concomitant Chemo-Radiotherapy

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