bluuebunny/crossref_metadata_2025_split huggingface dataset:
Acid Stimulation of Onnagawa Tight Oil Formation in Ayukawa Field, Japan
Authors: Kamitsuji Ryohei , Okajima Takuro , Yokoi Satoru 
Published: November 2013

AbstractThe Onnagawa shale is Miocene, bio-siliceous and known as the main source rock in Japan. Frequent and intensive oil shows are observed through the Onnagawa formati on around the Ayukawa field. The thickness of this layer is about 1,600 ft around this field. The porosity is around 30%. The Permeability ranges from 0.01 mD to 1 mD. Onnagawa is considered to be similar to Monterey shale. Acidizing in Monterey shale has a long history of success. Though the production is generally improved by removing the drilling and completion damage, unexpected favorable responses from low permeability rock are also reported. These improvements are considered to result from dissolving the calcite and clay minerals in natural fractures and enhancing the wellbore connection into natural fracture network. The acid stimulation test was conducted to verify this acidizing effect in Onnagawa shale. The target well showed very low productivity. The perforation interval is 40 m (130 ft) long. Weakly fracture distribution is detected from wellbore images. No skin and low permeability on the order of 0.01 mD were estimated from the well test analysis. So the objective of this stimulation is not the removal of drilling and completion damage, but the improvement of natural fracture conductivity. The stimulation program was comprised of three stages that alternated 15% HCl preflush, 12% HCl + 3% HF main acid, NH4Cl overflush, and particulate diverting agent. The volumes of preflush and main acid were 80 gallon/foot each. The significant pressure drops indicating the injectivity improvement were observed during both preflush and main acid injection. The oil production dramatically increased from 1.5 kl/day (10 BOPD) to 50.0 kl/day (315 BOPD). The productivity index also increase from 0.3 kl/day/MPa to 45.0 kl/day/MPa. This test is the first successful stimulation of the tight oil formation in Japan.
Fracturing Technology of Coalbed Methane in Qinshui Basin
Authors: Xianpeng Jin , Zhongxiao Lan , Chengyu Lan , Wenjun Wang , Rui Wang , Donghong Zheng , Tao Wu , Taizhen Yue , Hongyan Zhou , Haifei Wen 
Published: November 2013

Abstract
Coalbed methane (CBM) reservoir with Lower Young's Modulus, higher Poisson's ratio, and lower permeability is different from conventional sandstone reservoir in composition, structure, tectonic and mechanical property, therefore, the fracturing technique and mechanism are much more different. Qinshui Basin located in the southeast of Shanxi Province is of simple synclinorium structure, less of faults, and it has up to 10 layers of coal seams, total thickness 1.2–23.6m and the maximum 6.5m. By far, No.3 and No.15 coal seam of Qinshui Basin have been developed for CBM production, depth from 600m to 900m, and the rank of the coal are mainly meager-lean coal and anthracite. No.3 coal seam of Shanxi Formation is 0.53–7.84m thick, gas content 11.94m3 / t on average, mainly semi-bright coal and semi-dull coal, reservoir pressure gradient 0.7149MPa/100m on average, well-testing permeability 1.589mD on average, Langmuir volume 39.03m3/t on average, Langmuir pressure 2.902 MPa. No.15 coal seam of Taiyuan Formation is 0.6– 9.9m thick, gas content 12.45m3/t on average, mainly bright coal and semi-bright coal, reservoir pressure gradient 0.7727MPa/100m on average, well-testing permeability 1.14mD on average, Langmuir volume 40.91m3/t, Langmuir pressure 2.5417 MPa. Through optimizing the fracturing designs, evaluating fracturing fluid systems and implementing control measures, a set of ‘network fracturing’ treatments with casing injection, high displacement and activated water fracturing fluid as key techniques were developed and applied successfully for coalbed methane in Qinshui Basin with the rate of success more than 95%. The study also showed that the multi-fracture treatment by plugging perforation with plastic ball can be used in separate layer treatment of coalbed methane reservoir. Furthermore, variable injection rate and slug injection of proppant can also be used to achieve the purpose of controlling extension of fractures. In five years,1264 layers (at 1096 wells) were treated by using this fracturing technology in QinShui Basin, and the gas production rate is over 2000 m3/d in 60% fracturing wells.
Microstructure Characterization for a Shale Gas Reservoir by Combining Visualization Technique and Physical Measurement
Authors: Wei Chenji , Qin Guan 
Published: November 2013

AbstractWe characterize the nano-pore structure of the Longmaxi Shale that is a Lower Silurian marine shale play in China with huge potentials according to preliminary explorations. Scanning Electron Microscope (SEM) is used to visualize the pore structure of the samples. In addition, we present nitrogen adsorption experimental results and other petrophysical data (including total organic content, mineralogy, and on-site gas content measurement) for core samples from the target layer of the Longmaxi Shale. Nitrogen adsorption experiments are conducted on the samples from the target layer of the Longmaxi Shale and measure the nano-pores with diameter ranges from 2 nm to 100 nm at 77°K. Adsorption and desorption isotherms are obtained. BET and BJH models are used to determine the specific surface area and pore-size distribution respectively. Results of adsorption experiments and SEM images indicate that the pore structure of Longmaxi Shale is complex and has multi-scale pore dimensions. The micropores plus the mesopores contribute 90.8% to the total nanopore volume and 99.4% to the specific surface area respectively. Based on our analysis and discussion, nanopores contribute the majority of gas storage space. Organic matters play an important role in governing the nano-pores volume and specific surface area. Clay content and brittle minerals do not have direct relationship with the nanopore volume and the specific surface area, however, they may also provide pore spaces those may be measured by the nitrogen adsorption experiment, such as pores with micronscale or micro-fractures.
Understanding Reservoir Properties through High-Definition Microresistivity Images in Horizontal Shale Oil Wells Drilled with OBM in China
Authors: Yun Xie , Huijun Hou , Hui Guan , Laronga Robert J. , Zhongbin Xin 
Published: November 2013

Abstract
Oil-base mud (OBM) is an increasingly popular drilling fluid used to protect the wellbore stability in horizontal wells drilled in China targeting shale gas or oil. In these reservoirs, an in-depth understanding of fracture attributes is critical for stimulation design and well placement optimization, but the resolution and coverage of traditional imaging technology for OBM limits the extent to which this objective may be achieved. A microresistivity imager achieving resolution and coverage similar to established technology for conductive water-base mud (WBM), fully capable to distinguish fractures and formation structural features in OBM, has been a much needed technology development to provide critical insight required for shale oil exploration.
The paper presents a case study from the Bohai Bay basin in Eastern China, where oil shale formed in the faulted depression lacustrine sub-basins of the Lower Oligocene. One horizontal exploration shale oil well was drilled with OBM for reservoir evaluation. Only a gamma ray log and new, high-definition microresistivity image logs were acquired due to difficult operating conditions, which made it a great challenge to interpret reservoir properties and optimize stimulation design. Fortunately, two nearby vertical wells were drilled and evaluated in detail prior to design of the horizontal well, making use of geochemical, advanced acoustic, and microresistivity image logs to optimize placement of the lateral, thus providing a reference for estimation of the reservoir properties.
The results showed that the new, high-definition resistivity imaging tool gives detailed images suitable for full fracture and structure characterization, and that such high-quality images are feasible even in wells drilled with OBM. Interpretation of high-definition microresistivity images to build a near-well structural model provided a framework for correlation of fracture, reservoir, and mechanical properties from the vertical wells to the horizontal well. This provided a clear picture as to how the lateral well trajectory progressed stratigraphically within the shale section, as well as the distribution of the fractures, reservoir and non-reservoir rocks, total organic carbon (TOC) and minimum geo-stress along the well trajectory. Subsequently, this rich model provided the needed critical inputs to decide how and where to complete the well with an optimized stimulation design.
The changes of the polyphenol content and antioxidant activity in potato tubers (Solanum tuberosum L.) due to nitrogen fertilization
Authors: Musilová Janette , Lachman Jaromí­r , Bystrická Judita , Poláková Zuzana , Kováčik Peter , Hrabovská Diana 
Published: November 2013

Cultivar is one of the most important internal factors affecting polyphenol concentration in the plants. However, influence of the grown locality, climate conditions and way of cultivation belong to important external factors. In our experiment the influence of different nitrogen doses (0 - 40 - 80 - 120 - 160 - 240 kg N.ha-1) applied in the form of Vermikompost on the total polyphenol content and derived total antioxidant activity in cv. Sorento were investigated. While in the 1st - 5th variants the determined polyphenol content in dry mater of potato tubers decreased from 399.2 to 70.40 mg.kg-1, in the 6th variant that was twice higher in comparison to the 5th variants (135.6 mg.kg-1). The statistically significant differences in values of total polyphenol content between variants (polynomial function of 2nd degree) were confirmed. The study also confirmed a strong statistical correlation between the content of polyphenols and the content of antioxidant activity has been confirmed(sign. F: 3.24E-10). The highest value of antioxidant activity was observed in the first variant. From the first to the fifth variant (7.62 - 4.84%), the value of antioxidant activity was decreasing and in the sixth variant this value increased to 6.31%.
Quality and availability of organic foods by Slovak consumers
Authors: Kozelová Dagmar , Vietoris Vladimí­r , Fikselová Martina 
Published: November 2013

The increasing consumer demand for organic products caused that the organic food market has expanded in all continents of the world. Organic foods represent a specific segment of the food market. Currently land area farmed organically in Slovakia represents 9% of the total agricultural land. In this work we identified organic foods purchase by Slovak consumers, the availability, reasons of purchase and quality assortment of organic foods at the Slovak market. Questionnaire survey involved 271 respondents. The Hierarchical multiple factor analysis was used for the segregation and classification of consumers into representative groups. The group of respondents was based on algorithms divided into three groups. In the first group of respondents, prevalent are responses that assortment is not sufficient and no answer, in the second group think that organic food assortment is not sufficient, and in the third group of respondents also dominates opinion that is not sufficient. At the question of organic food quality in all three groups is prevalent opinion that it is rather high, in the first group nearly the third of respondents considered the quality of organic foods as rather low, in the second group of respondents is rate: „rather low“ response and „rather high“ almost equal. In the third group of respondents strongly dominated response that the quality of organic food is rather high. Regarding the availability of organic products at the Slovak market, 16% of respondents considered it to be sufficient, 54% of consumers considered assortment as not enough available for all. We also analyzed the reasons of buying organic food. 42% of respondents reported that the main reason for buying organic food is a concern for the environment and landscape, 33% of respondents state it is a pleasure and the opportunity to try something unusual, 11% reported confidence in the quality of organic food and 7% their health care. Environmental education in the family since childhood and the opinions of friends significantly influence consumers when buying food and organic food. We assume that, organic food will be processed minimally in the future. Consumer demand for organic food we recommend to increase by increased support of the direct sales, informing about quality of organic foods and their beneficial effects on the human body at basic and secondary schools, organizing of excursions to organic farms and processing companies.
C-Terminal-PEDF Reduces IC50 Doses and Chemoresistant Population of CD133 and BCRP1-Positve Cancer Stem Like Cells
Authors: Paola   Castro-Garcia  , Carmen   Gil-Gas  , Paloma   Honrubia-Gómez  , Carmen   Belen      Alvarez-Simón  , Jesús-José  Ferré-Fernández  , Francisco  Sánchez-Sánchez  , Jose  Luis  Sánchez-Sánchez  , Jose  Mª  Garcia-Bueno  , Sebastiá  Sabater  , Guadalupe  Aparicio  , Luis Miguel Antón-Aparicio  , Carmen Ramírez-Castillejo  
Published: November 2013

We report on two patients, successfully treated by the combination therapy of gemcitabine and 24-h intravenous infusion of cisplatin, who were initially diagnosed with node-positive advanced urothelial cancer. Each patient had a very good clinical response and underwent curative radical surgery after gemcitabine/cisplatin chemotherapy. A microscopically detailed examination of surgically obtained specimens showed the complete disappearance of malignant cells in the two cases. As a pilot study, we have used the regimen of gemcitabine plus 24-h continuous infusion of cisplatin, instead of bolus injection, for the treatment of 20 patients with node-positive or metastatic urothelial cancer. The clinical response rate in this regimen was 75% (complete response 7/20; 35%, partial response 8/20; 40%). The median overall survival was 665 days. As for the adverse effects, the incidences of severe neutropenia and thrombocytopenia (grade 3-4) were 20% and 15%, which might be less toxic than conventional gemcitabine plus cisplatin therapy. The 24-h infusion of cisplatin combined with gemcitabine can be highly recommended as neoadjuvant chemotherapy for locally advanced urothelial cancer.
Microbial susceptibility of bacteria and fungi against extracts of Psidium guajava L.: in vitro evaluation
Authors: Silva Rafael Menezes , Dourado Maurício da Rocha , Penha Marcela Quintão , Campos Luana Gischewski , Carvalho Monize Ferreira Figueiredo de , Júnior Donaldo Rosa Pires 
Published: November 2013

Aim: The present study aimed to evaluate the in vitro antimicrobial activity of hydroalcoholic and aqueous extracts from leaves of P. guajava on four bacterial and two fungal samples to determine the range of minimum inhibitory concentration of the extracts. Material and Methods: The antimicrobial activity of extracts of different polarities was compared using the agar dilution method. Differences in susceptibility to the active ingredient could be observed. Results: The results showed that the hydroalcoholic extract was active against Escherichia coli (1024 μg/ml) and Bacillus cereus (900 μg/ml). The aqueous extract showed no antimicrobial activity. Conclusions: Despite demonstrating antimicrobial efficiency, the P. guajava extract may be insufficient or may require a higher concentration to be fully effective.Uniterms: Psidium. Products with antimicrobial action. Traditional medicine.
Potencialidades e fragilidades da agenda: organização do atendimento clínico nas equipes de saúde da família
Authors: Costa Simone de Melo , Medeiros Alice Batista , Dias André Costa Alencar , Silva José Rodrigo da , Rodrigues Carlos Alberto Quintão , Leite Maísa Tavares de Souza 
Published: November 2013

Objetivo: O objetivo deste estudo foi identificar as potencialidades e fragilidades na construção da agenda, no âmbito da saúde da família, a partir da percepção do profissional acerca da organização do atendimento clínico. Materiais e métodos: Estudo quantitativo, transversal e censitário, realizado no PETSaúde. Utilizou-se questionário semiestruturado e autoaplicado. Resultados: Participaram 95 profissionais de nível superior, enfermeiros, médicos e cirurgiões-dentistas do município de Montes Claros, Minas Gerais,Brasil. Os profissionais atendem ao dia uma média de 15,49(±6,87) pessoas, apesar de considerarem ideal 13,13(±5,13) atendimentos. A organização da agenda clínica foi classificada em “moderadamente ou pouco organizada” para 48,4% dos profissionais. O atendimento domiciliar é realizado (91,6%). Critérios de risco foram incorporados para priorizar a assistência (78,9%), com maior reserva para a demanda programada (70,5%). Conclusão: Apesar de potencialidades na agenda, existem desafios a enfrentar. O gerenciamentodo sistema de saúde na atenção primária sugere valorizar o aspecto quantitativo como essencial para uma prática produtivista, o que estrangula o bom funcionamento e organização da agenda clínica na saúde dafamília.Descritores: Agendamento de consultas. Saúde pública. Atenção primária à saúde. Saúde da família.
Condição gengival de adolescentes residentes no Vale do Jequitinhonha, Minas Gerais.
Authors: Leite Lorena Olegário , Fonseca Emílio Prado , Ferreira Efigênia Ferreira e , Vargas Andréa Maria Duarte , Palmier Andréa Clemente , Abreu Mauro Henrique Nogueira Guimarães de 
Published: November 2013

Objetivo: Este estudo teve por objetivo descrever a condição gengival de adolescentes de 15 a 19 anos no Vale do Jequitinhonha, Minas Gerais. Materiais e Métodos: O estudo foi realizado com amostra calculadade 450 indivíduos em treze municípios selecionados de forma aleatória simples, após estratificação dos mesmos de acordo com porte populacional e o desempenho do serviço de saúde bucal municipal. A avaliaçãoda condição gengival foi analisada por um único examinador calibrado (Kappa≥0,85). O instrumento da análise utilizado foi um questionário com variáveis sociodemográficas e hábitos, respondido individualmente por cadaadolescente. Para os dados clínicos, utilizou-se-se a codificação 0, 1 e 2 do Índice Periodontal Comunitário (CPI) realizado no local de residência do adolescente, com utilização de sonda periodontal tipo OMS. Aavaliação foi obtida classificando: ausência de alteração gengival; apresentação de sangramento gengival à sondagem; presença de cálculo dentário; e presença de cálculo dentário e sangramento gengival. Resultados:Dos 450 adolescentes examinados, 16 (3,55%) apresentaram-se sem alterações gengivais, 235 (52,22%) com sangramento, 36 (8,00%) com cálculo dentário e 163 (36,22%) com sangramento e cálculo. De um total de2699 sextantes, 791 (29,30%) estavam hígidos, 1392 (51,56%) com sangramento, 94 (3,48%) com cálculo e 422 (15,63%) com sangramento e cálculo e um sextante estava perdido (0,03%). Conclusão: Uma importanteproporção de adolescentes apresenta-se com sangramento e cálculo.Descritores: Adolescente. Gengivite. Epidemiologia. Saúde bucal.
Prática da promoção e educação em saúde bucal nos hospitais de grande porte da região metropolitana de Belo Horizonte, Minas Gerais
Authors: Miclos Paula Vitali , Junior Manoelito Ferreira Silva , Oliveira Cecília Maria Soares Carvalho , Oliveira Maria Aparecida de 
Published: November 2013

Objetivo: O objetivo deste estudo foi verificar o estágio atual das práticas de promoção e educação em saúde bucal no contexto da Odontologia Hospitalar em hospitais de grande porte da Região Metropolitana de Belo Horizonte-MG (RMBH). Materiais e Métodos: Este é um estudo quantitativo, descritivo e transversal. Para a determinação do grupo amostral foi utilizado os critérios de inclusão: hospitais localizados na Região Metropolitana de Belo Horizonte, ser categorizado como de grande porte, oferecer algum tipo de especialidadeodontológica, independente do vínculo empregatício do cirurgião-dentista. A pesquisa foi realizada por meio de um questionário estruturado, realizado por apenas uma pesquisadora, dirigido ao cirurgião-dentista responsáveldo setor odontológico. Após utilização dos critérios, dos 21 hospitais de grande porte da RMBH, apenas 14 possuem cirurgião-dentista em seu corpo clínico. Os dados coletados foram tabulados no em banco de dadosExcel 2003 (Microsoft) em frequências absolutas e relativas. Resultados: Verificou-se em 2008 que 71,4% dos hospitais com cirurgiões-dentistas realizavam procedimentos educativos. Sobre os métodos de educaçãoem saúde encontraram-se as ações individuais como as mais utilizadas (80,0%), as palestras e as técnicas de escovação ocorrem na maioria deles (60,0%) e, em menor proporção, mas não menos importante, em20,0% dos hospitais aplica-se a técnica de escovação supervisionada. Os temas mais abordados em atividades educativas foram: uso da escova e fio dental em 100,0% dos casos, dieta cariogênica, uso de antissépticosbucais e interferência das condições bucais sobre a saúde geral do paciente em 90,0%. Conclusão: Verificouse que a maioria dos hospitais da RMGV realizam educação e promoção de saúde bucal. Estas práticasindependentes do tipo de procedimento educativo executado devem estar consolidadas no contexto hospitalar, afim de, fortalecer e justificar a necessidade deste profissional nos hospitais.Descritores: Promoção da saúde. Educação em saúde bucal. Equipe hospitalar de odontologia.
Mode number calculations of ULF field‐line resonances using ground magnetometers and THEMIS measurements
Authors: Sarris T. E. , Li X. , Liu W. , Argyriadis E. , Boudouridis A. , Ergun R. 
Published: November 2013

AbstractUsing multiple pairs of International Monitor for Auroral Geomagnetic Effects ground magnetometers together with simultaneous measurements from two of the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft constellation, when they were flying over the magnetometers in magnetic conjunction and in close azimuthal separation, we are able to calculate the phase differences of Ultra Low Frequency Field‐Line Resonances, and, through that, their azimuthal mode number, wavelength and propagation characteristics. A cross‐wavelet technique is applied, that exposes the times and frequencies of common power between time series from azimuthally aligned magnetometers in space or on the ground, yielding their relative phase. Using the amplitude ratio and phase differences between ground stations with similar longitudes that are separated in latitude, a correction to the mode number calculation is demonstrated, accounting for the phase differences that arise from the L shell separation of the THEMIS probes.