bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Hybrid Artificial Intelligence Method to Predict Gas Solubility and Bubble Point Pressure
Authors: Moussa Tamer , Elkatatny Salaheldin , Abdulraheem Abdulazeez , Mahmoud Mohamed , Alloush Rami 
Published: June 2017

Abstract
Bubble point pressure (Pb) and gas solubility (Rs) are reservoir fluid properties that have significant effect on oil reservoir characterization and reservoir engineering computations. Better knowledge of these PVT properties improve the reliability of reservoir simulation. Perfectly, these properties should be obtained from actual laboratory measurements. However, these measurements are either not available or very costly to be obtained. For these reasons, there is a need for a quick and reliable method for predicting these PVT properties. There are numerous approaches for predicting PVT properties, namely, empirical correlations and computational intelligence schemes.
The objective of this research is to develop reliable model by utilizing a novel comprehensive approach using hybrid Self-adaptive Differential Evolution and Artificial Neural Network (SaDE-ANN) that could be used as a robust and effective model to predict Pb and Rs of crude oils based only on oil and gas gravities in addition to the reservoir temperature. This model was developed using data sets collected from published sources. Statistical error analysis was also used to check the validation of the two proposed empirical correlations introduced based on the weights and biases of the developed SaDE-ANN model.
Based on the results generated by the proposed model compared with other conventional methods, that SaDE-ANN model is a reliable and accurate approach for predicting Pb and Rs of crude oils with a high accuracy and correlation coefficient of 99%. The developed approach is inexpensive with no additional required equipment or tools.
This paper, for the first time, introduced a novel approach that utilizing only on three input parameters; oil gravity, gas gravity and reservoir temperature to predict Pb and Rs of crude oils. This approach has not been applied or investigated before this research. Therefore, it is a step forward to eliminate the required PVT lab experiments and discover the capabilities of hybrid optimization and artificial intelligence models as well as their application in predicting PVT properties. Outcomes of this study could help reservoir engineers to have better understanding of reservoir fluid behavior when experimental data samples are not available.
Challenges with Securing Power Water Injectors Completed in the Reservoir Oil-Water Contact
Authors: Al-Hajri Nasser M. , Al-Ajmi Mohammed D. , Mahsoon Ahmed H. , Al-Tammar Abdulmohsen A. , Al-Meshal Fahad M. , Al-Shammari Nayef S. 
Published: June 2017

Abstract
The paper outlines operational challenges during the well securement of a Power Water Injector (PWI) completed in the reservoir oil-water contact (transition zone). Surface integrity issue arose in Well-A necessitating the installation of adequate downhole barriers to carry-out surface remedial repairs safely. Well isolation shut-offs were not successful in eliminating surface pressure to meet the minimum stipulated operational requirements for this field. Well operator's barrier philosophy mandates the presence of two shut-offs; one of which is mechanical, to allow removing surface control equipment during rigless operations in power water injection wells with positive wellhead pressure.
Water flooding strategy in Field-A calls for drilling water injectors at the flanks and maintaining a peripheral injection scheme. However, as more wells are placed towards the crust of the reservoir to sweep the remaining oil behind the flood front, this well placement strategy leaves behind a transitional zone where more than one fluid phase is present. Formation evaluation logs conducted on Well-A indicated that the completed reservoir interval lies within the oil-water-contact.
Typical well completions for PWIs in Field-A use large casing sizes up to 9-5/8 in. of outer diameter. Bullheading pumping technique is conventionally sought as the primary securement method for water injectors. However, hydrocarbon displacement with kill fluid in such types of completions is challenging given that the hydrocarbon displacement velocity is often surpassed by its segregation velocity. Attempts to eliminate the persistent wellhead surface pressure build-up in Well-A were unsuccessful.
Fluid circulation was then, applied to Well-A. Heavy fluid was forward-circulated against a blank mechanical plug installed below the wellbore oil-water interface which was detected by a wireline gradient survey. Accordingly, compromised wellbore fluid was displaced. This technique has set the pace for future well securement operations in PWIs completed in the reservoir transition zone.
Dynamic Prediction of Reservoir Pressure in ESP Oil Wells
Authors: Al-Sunnary Khaled J. , Al-Ajmi Mohammed D. , Mishkhes Abdulrahman T. , Al-Hajri Nasser M. , Shawly Alaa S. , Al-Shehri Ayedh M. , Al-Shammari Nayef S. 
Published: June 2017

Abstract
This paper presents a well performance modeling approach to generate reservoir static bottom hole pressure (SBHP) data from on-stream oil well production data in wells completed with Electrical Submersible Pumps (ESP). The approach does not require shutting-in the well to obtain the SBHP as conventionally required prior to data collection. Hence, production losses are eliminated without compromising reservoir pressure surveillance. Recording downhole SBHP is an essential requirement for reservoir pressure surveillance as it provides significant information to evaluate reservoir inflow performance. SBHP data is used to generate the periodic isobaric maps, update the reservoir simulation models, and re-evaluate the applied injection strategy for possible adjustments when needed.
Rigorous reservoir and wellbore performance analysis techniques were employed to generate accurate top-down reservoir pressure prediction models. The predictability of these models was statistically assessed on field representative samples of ESP completed wells with a wide-ranging operating parameters i.e. liquid rate, flowing wellhead pressure, water cut and reservoir pressure. In this modeling, ESP downhole sensors data were leveraged to reduce the uncertainty of the outflow performance models. A sample of 22 case studies from 4 different reservoirs was studied. These case studies were diligently selected to represent all ranges of operating parameters and reservoir pressure. Sensitivity analysis was performed on the well performance models to identify sources of uncertainty that can affect the model accuracy.
Overall, this method has been proven to be widely accurate. The prediction performance of this method was found to be within 1.5% accuracy of actual pressure measurements.
Cracking the Code of Unconventional Reservoir Simulation
Authors: Ahmed I. , Oza S. , Vargas-Silva S. , Poludasu S. , Paryani M. , Attia B. , Smaoui R. , Umholtz N. , Ouenes A. 
Published: June 2017

Abstract
Predictable well performance is a key factor for the economic development of unconventional reservoirs including tight sands, tight carbonates and shales. A factory approach to developing unconventional reservoirs has resulted in unpredictable and highly variable well performance, much of which has been uneconomic. Minimizing the uncertainty in production forecasting and reservoir simulation necessitates an accurate model, which captures the interaction of induced hydraulic fractures with existing natural fractures. One method to achieve this is by using a 3G workflow, which leverages the synthesis of geophysical and geological information through geomechanical techniques to model the hydraulic fracturing of unconventional reservoirs.
A complete workflow is presented for modeling and simulation of unconventional reservoirs, which incorporates the characterization of natural fractures and their interaction with hydraulic fracture stimulation. The 3G workflow is applied to an unconventional well in the Wolfcamp Shale, Permian Basin. The geomechanical modeling results are exported to a standard commercial numerical reservoir simulator using two different approaches; strain volume and constrained asymmetric hydraulic fractures. A third reservoir simulation case is created in which commonly used symmetric hydraulic fractures are generated without any external geomechanical model. An automated history matching tool is used to find the hydraulic fracture parameters for this over simplistic and unrealistic case. The production forecast and pressure depletion profiles are compared for all three cases. The proposed unconventional modeling workflow is not only fast but also significantly reduces uncertainty in the reservoir simulation results, improving reliability of the production forecast as well as the pressure depletion profile. These constrained simulations provide the information necessary to make better decisions in field development planning.
An Overview of Polymer Resin Systems Deployed for Remedial Operations in Saudi Arabia
Authors: Alsaihati Zainab A. , Al-Yami Abdullah S. , Wagle Vikrant , BinAli Ali , Mukherjee Tushar S. , Al-Kubaisi Abdullah , Halim Ab Hamid , Khalil Mohamed , Alsafran Ali 
Published: June 2017

Abstract
Gas migration through cement columns has been an industry challenge for many years. Formation gas/influx can migrate through the cement column resulting in gas being present at the surface. To overcome gas migration on existing wells, remedial jobs are executed, which requires detailed engineering and testing prior field deployment.
The objective of this paper is to detail the effort and experimental work that took place to use different polymer resin systems in Saudi Arabia gas wells. The two polymer resin systems are differentiated by their main component, either epoxy resin or polyester resin. The epoxy resin system is prepared by mixing an epoxy resin with an aromatic amine curing agent while the polyester resin system is prepared by mixing polyester resin with norpol peroxide curing agent, filler, and silicon dioxide. This study is the first to assess the performance of two different types of polymer resin systems and evaluate their remedial operations according to the authors’ best knowledge. In addition, this paper discusses operational challenges that may occur when using each type of polymer resin system.
Lab tests were conducted to measure the thickening time, the rheological properties, compressive strength, and limitations for each polymer resin system. The tests suggest that a maximum temperature of 225°F and 275°F should be maintained when using the epoxy and polyester polymer resin systems, respectively.
Based on the study, the epoxy resin system is easier to control as it is composed of only two components unlike the polyester resin system, which is comprised of several components. The lab study suggests operational recommendations to increase the probability of success of the polymer resin systems.
On the Edge of Chaos: Complexity Offering Value Expectations on O&G Projects
Authors: Ziadat WaEL , Kirkham Richard , Gardiner Paul 
Published: June 2017

Abstract
Oil and gas drilling schemes are inherently complex systems comprising different technical disciplines and multiple interconnected, globally diverse stakeholders, operating within a dynamic environmental and legislative environment. This presents numerous challenges to traditional project management which assumes a very ‘reductionist lens’ and which fails to account for the impact of dynamic internal and external forces on the ‘soft’ boundaries of the project domain. Oil and gas projects are characterized by extreme difficulty in predicting outcomes and system behaviors and, at the tails of the distribution of events, ‘black-swans’ do occur. This increases project and business risk for stakeholders and affects value creation and appropriation opportunities.
The paper argues that a holistic understanding of oil and gas drilling projects is necessary to account for the experiences, politics, human interactions, emergence and complex behavior of individuals and teams, both internal and external to the project environment. Experience and case studies will be discussed and challenged to uncover if this complexity is one of the reasons why projects sometimes fail to deliver sustainable value outcomes to clients. Then, through exploring complexity theory, we will attempt to understand the importance of understanding and coping with the emergent behavior of systems, using the theoretical ‘edge of chaos’ as a metaphor for ‘highly complex projects’. By understanding complexity (as distinct from attempting to quantify it), the authors suggest that our existing ‘bodies of knowledge’ in project management may require a significant renovation to improve project outcomes, the value expectations that clients have and to contribute to long term sustainable and competitive growth for the industry.
Clayey Sandstone Rocks Integrity after Flooding with High pH Chelating Agent EOR Solutions
Authors: Mahmoud Ahmed Abdulhamid , Al-Hashim Hasan S. 
Published: June 2017

Abstract
Chemical flooding of sandstone reservoirs having different types and contents of clays and non-clay minerals requires special attention to understand the interaction between the injected fluids and the reservoir rock minerals.
Four coreflood experiments were conducted in this study using two different sandstone samples (Gray Berea and Gray Bandera) with different clay contents (8 - 12wt%). The core samples were characterized through XRD, SEM and NMR firstly before coreflood experiments to identify the presence and distribution of the different minerals inside the pore system and after the flooding experiments to evaluate the rock integrity after interaction of these minerals with the injected EDTA solutions. The effluent was analyzed by inductively coupled plasma (ICP) and ionic chromatography (IC) analyses to study the exchange ability of the different cations between sandstone cores and EDTA solutions. The core samples permeability was also measured before and after the flooding experiments to study the compatibility of the different clays with different concentrations of EDTA solutions.
The EDTA solutions with concentrations up to 10wt% were found to be compatible with Gray Berea sandstone as indicated by the permeability enhancement, NMR results and the pressure drop during the flooding tests; which indicates that there was no clay minerals swelling or fine migration occurred or nonclay minerals dissolution duo to the interaction of Gray Berea/EDTA solutions. On the other hand, EDTA solutions of concentrations higher than 5wt% were found to be incompatible with Gray Bandera samples as indicated by the high permeability enhancement duo to the interaction of EDTA with Ankerite mineral. The pressure drop along both Gray Berea and Gray Bandera core samples during the flooding experiments confirmed the stability of the different clays with EDTA solutions.
This study focused on evaluating the interaction of the sandstone rock surfaces with the high pH EDTA chelating agent solutions and the ability of this chemical to chelate the multivalent cations from clay minerals and its effect on the integrity of different sandstone rocks.
Soil Erosion as Affected by Freeze‐Thaw Regime and Initial Soil Moisture Content
Authors: Liu Hongyuan , Yang Yang , Zhang Keli , Sun Chuanlong 
Published: June 2017

Core Ideas
Freeze‐thaw generally increased detachment capacity by an average of 36.5%.
The impact of freeze‐thaw on soil erosion was affected by initial moisture content.
Detachment capacity and rill erodibility was increased at 30 and 45% moisture.
Soil erosion was reduced at 20% moisture content after 5 or 10 freeze‐thaw cycles.
The effect of freeze‐thaw exponentially increased with the freeze‐thaw cycles.
To quantify the effects of freeze‐thaw (F‐T) on rill erosion, scouring test using a tilting flume (5 m length, 0.4 m width) was conducted. Typical black soil in Northeast China was tested. Five F‐T cycles (FTCs; 0, 1, 3, 5 and 10), four gravimetric moisture contents (θg; 10, 20, 30 and 45%), and seven flow shear stresses (τ; evenly spaced from 1.90 to 14.59 Pa) were examined. The soil samples subjected to 0 FTC were termed as the unfrozen control group. The results showed that the F‐T processes increased soil detachment capacity (Dc) by an average of 36.5% across all experimental conditions together. The effects of F‐T on Dc varied with initial θg. To eliminate the consolidation impact induced by water spraying, the Dc ratio (RDc) between each F‐T group and the corresponding unfrozen control group was calculated. This ratio was found to exponentially increase with FTCs, with an R2 of 0.94. The rill erodibility (Kr) increased with FTCs only at initial θg of 30 and 45%. Soil critical shear stress (τc) of the experimental group was significantly higher relative to the unfrozen control group and reached its maximum after 10 FTCs at the initial θg of 20%. These findings help to understand the effects of FTCs on soil erosion and thereby to improve soil erosion models, e.g. modifying rill erodibility parameters.
Investigating effect of socio-economic and climatic variables in urban water consumption prediction via Gaussian process regression approach
Authors: Roushangar Kiyoumars , Alizadeh Farhad 
Published: June 2017

Abstract
Due to the importance of forecasting urban water demand (WD), the present study investigated the capability of Gaussian process regression (GPR) using different features as input data. WD could be represented as a function of various variables such as climatic, socioeconomic, institutional and management factors to understand it better. Therefore, in the present study, GPR was used to predict daily WD by taking advantage of several socio-economic and climatic variables for Hamadan city, located in the west of Iran. The selected variables were comprised of daily weather data such as rainfall (R), maximum temperature (Tmax), mean temperature (Tmean), min temperature (Tmin) and relative humidity, Socioeconomic variables such as average monthly water bill (MWB), population (P), number of households (NH), gross national product, and inflation rate (I). The results indicated that GPR could predict the daily WD accurately in terms of statistical evaluations criteria. Sensitivity analysis among various climatic and socio-economic data showed the best input structure in water consumption prediction via GPR. Accordingly, the results approved the substantial impression of WD with three day-lag, I, MWB and Tmax as the input dataset.
Assessment of knowledge, attitude and practice of clinical students’ of Yazd University of Medical Sciences toward Isolation Precaution
Authors: Talebi azabadi Ali , Vakili Mahmood , Modarresi Mojgan , Mirrokni Nasrin 
Published: June 2017

Background: To determine the level of knowledge, attitude and practice among clinical students’ of Yazd University of Medical Sciences toward Isolation Precaution -1394.Methods and material: A descriptive –analytical cross-sectional study was developed and distributed to 300 clinical students who studied in Yazd University of Medical Sciences. The self-administered questionnaire was composed of demographic data and three parts, knowledge, attitude, and practice, toward Isolation precaution (standard, droplet, airborne and contact precautions). Results: The survey was completed by 325 (response rate: 92/3%) of potential respondents. Mean scores of knowledge, attitude, and practice towards standard, droplets, airborne and contact isolation precautions were poor. In addition, a linear correlation was found between three items of the survey including knowledge-attitude, knowledge-practice and attitude- practice in all subgroups of isolation precautions.Conclusion: clinical students’ of Yazd University of Medical Sciences seemed to have low levels of knowledge, attitude and practice towards infection control. There are numerous educational deficits in our clinical students’ of Yazd University of Medical Sciences in relation to infection control that must urgently be addressed
EL ECOFEMINISMO EN EL DESARROLLO RURAL SOSTENIBLE
Authors: Cabrera Duarte Mario Alexander 
Published: June 2017

Resumen: El ecofeminismo es una valiosa fuente del conocimiento humano que ofrece, desde su teoría y práctica, la oportunidad de contribuir a mejorar las condiciones de vida de las personas. En este artículo exploro la importancia que tiene para fomentar el desarrollo rural sostenible en los países empobrecidos, al evidenciar la urgente necesidad que existe en sus comunidades rurales de respetar a las mujeres y la naturaleza. Palabras clave: Ecofeminismo, mujeres, desarrollo rural sostenible, países empobrecidos. Ecofeminism in Sustainable Rural DevelopmentAbstract: Ecofeminism is a valuable source of human knowledge. It offers, from theory to practice, the opportunity to help improve people’s lives. In this article, I address the importance of promoting sustainable rural development in poor countries because of the evident lack of respect to women and nature in their rural communities. Key words: Ecofeminism, women, sustainable rural development, impoverished countries.
EL ESTADO-HOSPITAL: CORPORALIDADES ANÁRQUICAS, BIOPOLÍTICA Y VIOLENCIA EN IMPUESTO A LA CARNE DE DIAMELA ELTIT
Authors: Solorza Paola Susana 
Published: June 2017

El presente trabajo se propone, a partir del análisis de la novela Impuesto a la carne (2010) de Diamela Eltit, demostrar el modo en que el paradigma biopolítico da lugar a un control excesivo sobre los cuerpos, “legitimando” distintas formas de violencia con el riesgo de caer en una tanatopolítica. La metáfora del hospital, en tanto espacio simbólico asimilable al Estado, remite a la memoria de la dictadura y los años de opresión en Chile. Allí, una madre y una hija, proyectándose en un vínculo simbiótico de fuerzas anárquicas, atentarán contra la estabilidad del Estado-hospitalario, oponiendo una acérrima resistencia.Palabras clave: Biopolítica, tanatopolítica, violencia, Diamela Eltit, Impuesto a la carne.The Hospital-State: Anarchic Corporalities, Biopolitics and Violence in Impuesto a la carne by Diamela EltitAbstract: Focusing on the novel Impuesto a la carne (2010) by Diamela Eltit, this paper analyses the way in which the biopolitical paradigm develops an excessive control over the bodies, “legitimizing” different forms of violence and risking falling into a thanatopolitics. The metaphor of the hospital –as a symbolic space resembling the State– relates to the memory of the dictatorship and the years of oppression in Chile. In Eltit’s novel, a mother and a daughter, projecting themselves onto the other in a symbiotic relationship of anarchical forces, they will threaten the stability of this “hospital” State, opposing a staunch resistance.Key-words: Biopolitics, thanatopolitics, violence, Diamela Eltit, Impuesto a la carne.
La recepción de Montagu y Barbauld en The Westminster Magazine
Authors: Costa Mónica Amenedo 
Published: June 2017

Las mujeres del siglo XVIII desempeñaron un papel activo en la producción cultural británica. En aquel momento, algunas publicaciones periódicas eran de gran valor, especialmente a la hora de proporcionar información sobre autores y sus obras. Este documento examina la representación de Elizabeth Montagu y de Anna Letitia Barbauld en The Westminster Magazine. El énfasis principal recae en cómo se percibieron y presentaron al público estas dos autoras y en cómo se dio cobertura a su contribución al ámbito literario. Además, se hace hincapié en la influencia de este tipo de publicaciones en las opiniones y percepciones del lector.