bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Novel Technique to Revive Killed Wells Back into Production
Authors: Wrighton Christopher , Xiao J J , Cochran Jami , Mukerji Parijat 
Published: January 2020

This paper describes the development program for a new and innovative well intervention service for lifting naturally flowing wells back into production.

The Well Initiation Service Tool (WIST) is a high efficiency, slimhole pumping system that is conveyed and powered through a wireline power cable to the appropriate depth to lift high density kill fluid; thereby, lightening the fluid column to kickoff/initiate and allow the well to flow naturally to surface.
A multi-resettable inflatable packer system has been developed to work with the permanent magnet motor pumping system, which allows the pump to be positioned and repositioned in the well as required. This design improves operational efficiency, enabling jobs to be conducted in a single run, rather than multiple runs as would be the case with conventional packer design.

The rigorous test program looked at each element of WIST individually and then as a system in both horizontal and vertical flow loops to verify performance. The novel multi-resettable inflate hydraulic logic circuit worked perfectly exceeding design/performance expectations. Planning is now in progress for three field trials to validate WIST performance. This paper will describe the development activities, results and future plans.

This lightweight cable deployed pump system is an alternative to coiled tubing and nitrogen kickoff jobs, which can often be expensive and logistically challenging, requiring a large amount of equipment and personnel at the wellsite to perform the activity.
Transitioning a Legacy Reservoir Simulator to Cloud Native Services
Authors: Noor Zainub , Wang Qinghua , Govindaraju NagaBalaji , Lu Jianxin , Dong Hui 
Published: January 2020

The digital transformation journey provides new opportunities for running simulations through cloud computing, with flexibility in hardware resources and availability of a wide array of software tools that can enhance decision-making. This work reviews the benefits of running reservoir simulations in a cloud environment and demonstrates the efficiency and cost savings. Additionally, a workflow for uncertainty analysis and history matching that integrates data analysis and machine-learning tools is presented.
First, the hardware architecture must be designed to meet parallel reservoir simulation needs: significant message passing occurs between computer nodes, and for satisfactory performance, these nodes must be connected by a low-latency network, rather than be randomly located. Second, to ensure portability and easy replication across multiple cloud sites and platforms, the software performing the simulations must be containerized. Third, to reduce the time required to start a new simulation run, the Kubernetes platform is used to optimize resource allocation. Finally, reservoir simulation in the cloud is no longer merely the running of the simulation model, but it is integrated with data management and data analysis tools for decision-making. The cloud-based simulation services discussed herein exhibit good results during scale up, when a simulation operation requires a larger number of central processing units and/or greater memory, and also during scale out, when thousands of operation scenarios are necessary for history matching. The "pay as you go" pricing model reduces the time and capital costs of acquiring the new computing infrastructure to nearly zero, and the effectively unlimited scale-out capability can reduce the elapsed time for history matching by 80%. The availability of data centers in different regions is good for team collaborations. It serves the data management tool well to track history data, perform data mining, extract more information, and make decisions.
Compared to traditional reservoir simulation, the cloud-based reservoir simulation software as a service model simplifies the process and reduces hardware acquisition and maintenance costs. Integrating intelligent data analysis with simulation helps quantify the uncertainty in the model and enables improved decisions.
Advancements in Turbine Performance for Coiled Tubing Drilling
Authors: Bussy Mohamad , Khamees Shaker A. , Al-Naim Mohammad , Fudge Grayson , Duesterhoeft Martin , Folaranmi Felix , Aldawood Jahad , Arguedas Oswaldo , Flint Gordon 
Published: January 2020

Over the past 20 years in the Middle East Region, the performance of Underbalance Coiled Tubing Drilling (UBCTD) has significantly improved, with regular use in several areas. Improvements in application selection, drilling technologies & procedures have also helped to expand the scope of available reservoir targets.
Widening the available choice of down hole tools is one main factor that has led to an improvement in drilling performance and one such technology is the 2 7/8" downhole turbine drive motor (turbine). Historically, the choice of turbines for UBCTD had been restricted to harder formations but for over a decade now, turbines have been used in these UBCTD applications in KSA – consistently producing steady drilling performance and meeting well objectives.
In a recent bid to optimize drilling performance, a newly designed high-power 2-7/8" downhole turbine was introduced for KSA in 2018. This new turbine utilized in varying downhole environments, from hard and abrasive sandstone to the typically targeted carbonate reservoirs. Trials were performed in varying downhole temperatures to evaluate the performance improvement. Today this turbine has shown a visible improvement in both performance and reliability compared to the alternative turbine options.
The new turbine design integrated with existing MWD technology in order to execute the drilling operation in UBCTD with higher drilling efficiency and better economic returns. In order to establish performance improvements, a set of success indicators was established:
Power delivery efficiency.
Performance in varying reservoirs
Turbine and MWD tool Reliability
Directional drilling performance
Downhole tool vibration monitoring.
These success indicators were closely monitored during 2018 and the results revealed a significant increase in overall footage drilled. BHA reliability also improved. From these two major factors, the utilization of 2 7/8" downhole turbines have significantly increased.
A Novel Approach in Gas Well Performance Monitoring and Forecasting Using Modified Decline Curve Analysis
Authors: Kaur Balpreet , Haq Bashirul , Ahmed Iftekhar , Habibi Daryoush , Phung Viet , Al Shehri Dhafer , Amaechi Benedict Ikem , Kabir Jahangir , Jamaluddin Abul 
Published: January 2020

Decline curve analysis is a widely used technique in evaluating well production performance and forecasting. One of the most commonly used decline curve modelling approaches is called Arp's model. This modelling approach has four fundamental assumptions. One of these assumptions is that the well is produced at constant bottomhole pressure (BHP). This assumption is usually approximated under real-production situation. Therefore, the objective of this study is to construct a novel mathematical workflow using modified decline curve models without violating constant pressure assumption, and use the production forecast to identify potential issues in the wellbore.In this data analytic process, using a large field data sets, the linear regression technique was implemented to convert variable pressure values into an equivalent constant pressure value. Consequently, this equivalent constant pressure was used to derive new gas rates using the back pressure equation. The new gas rates were used as input parameters in the new production performance as well as forecasting algorithm.Using MATLAB's toolbox, a large set of field gas production data were analysed, and the results showed very good agreement with insignificant margin of deviation. In addition, the new model prediction when compared with the actual production data enabled the user to detect events such as liquid loading (hydrocarbon) or water dropout phenomena. Consequently, the new algorithm was used to forecast the future production behaviour.A novel decline curve modelling algorithm without constant bottomhole pressure approximation is presented in this paper. In addition, the new algorithm also presents a tool for the reservoir engineers to identify events in the wellbore such as well loading with dropped out condensate or accumulation of conning water to create blockage of gas production.
The Adoption of Management Accounting Practices (Maps) in Small and Medium Enterprises (SME's) of Pakistan
Authors: Allah Bakhsh  , Zeeshan Mahmood  , Sana Chaudhry  
Published: January 2020

The practices of Management Accounting have not been highly adopted in developing countries. But with increased importance of these practices, firms of developing countries are motivated to adopt MAPs. In this research, MAPs align with increased importance of SMEs have been studied and provide understanding to enhance adoption of MAPs in SMEs. This study outlines the usage of MAPs in Pakistani SMEs; identify the contextual factors that affect the adoption of MAPs by SMEs and lastly explore perceived benefits and problems in adoption of these practices. A mixed methodology was used to collect data. A questionnaire with five categories of MAPs was used to examine the extent of use of MAPs by 100 SMEs of Multan from textile sector. Eight interviews were conducted to identify the factors, benefits and problems. However, the results shows that majority of respondent firms adopt traditional MAPs and other medium sized firms do more focus on contemporary MAPs. The findings of current study can be helpful and informative for practitioners and policy makers in the development of contemporary MAPs as well as provide deep insight for SMEs to enhance their business by adopting these practices.
Prognostic Model of Surgical Treatment of Severe Mitral Regurgitation at Mitral Valve Prolapse
Authors: Mokhnatyi S. I. , Dovgan O. M. 
Published: January 2020

The article presents a single-center experience of surgical treatment of patients with severe mitral regurgitation(MR) caused by mitral valve prolapse (MVP). The study is based on long-term results of reconstructive interventions on the mitral valve (MV) of the UCCC of the Ministry of Health of Ukraine. The purpose of this work is to determine the factors that influence the long-term results of surgical treatment of MR in prolapse of the mitral valve leaflets.
Material and methods.From January 1, 2011, to January 1, 2018, 146 patients with severe MR were operated on the basis of the UCCC, which was conditioned by the prolapse of mitral valve leaflets.
Results.Long-term results were analyzed in 95.2% of patients. The average postoperative follow-up period was 39.7 ± 19.8 months. The overall mortality rate was 1.4%. Freedom from moderate and severe MR in the remote postoperative period decreased to 94.2%, compared to the early postoperative period. Residual MR was absent in 17 (12.4%) patients. In 76 (55.5%) patients trivial MR was detected, in 36 (26.3%) there was a mild MR, in 3 (2.2%) a moderate MR. In 5 (3.6%) patients, a severe MR was detected during the observation. Using statistical methods, it was found that the anatomical variant of MVP influences the prognosis of treatment results in the long postoperative period with worse results in the group with isolated prolapse of the anterior leaflet. Also, the dependence of the results on the applied surgical techniques with better results in annuloplication using the annuloplasty rings and in the application of resection of the posterior mitral leaflet. On the basis of statistics, a prognostic model for the evaluation of MV repair results in the distant period was developed. The height of coaptation of mitral leaflets was determined as one of the indicators for predicting the results of surgical treatment of MR with MVP.
Conclusions: 1. In most cases, a successful mitral valve repair is possible with the MVP. 2. A good immediate result does not mean keeping it in the long term. 3. The long-term results of MV reconstruction depend on the anatomical variant of the MVP, with worse results in patients with isolated prolapse of the anterior mitral leaflet. 4. The result of MV repair depends on the surgical techniques used, with better results when using the annuloplasty rings and resection of the posterior mitral leaflet. 5. The height of the coaptation of the MV leaflets is an indicator that allows predicting the outcome of surgical treatment in the long postoperative period.
Infective endocarditis and pregnancy
Authors: Siromakha S. O. , Rusnak A. O. , Luchinets O. F. , Ogorodnyk A.O. , Malysheva T. A. , Lazoryshynets V. V. 
Published: January 2020

Infective endocarditis in pregnant women is a threatening disease that leads to significant maternal and perinatal losses. Methods for caring for such patients have not yet been standardized, and literature sources provide single descriptions of case reports.
Objectives. To reduce maternal and perinatal mortality and disability, as well as to provide optimal management and delivery strategy for pregnant women with infective endocarditis.
Materials and methods.This paper presents the experience of treating three cases of IE in pregnant women (n-2) and parturient (n-1) by specialists of a national multidisciplinary team. In all three cases, cardiology, cardiac surgery and perinatal tactics were personalized in accordance with the recommendations of the European Society of Cardiologists and the experience of the team members. Parturient with acute IE and septic clot of right ventricle underwent urgent cardiac surgery. Another pregnant was provided with conservative support by a multidisciplinary team due to the absence of indications for immediate surgery (she underwent aortic valve replacement and mitral valve repair in 11 days after in-term labour). The third one underwent cardiac surgery (mitral valve repair) with fetus in utero at 21 weeks of pregnancy after 11 weeks of de-escalation therapy by antibiotics.
Results. In all cases, the immediate maternal and perinatal results were good. Follow-up for two cases we could observe (33 and 18 months after surgery) are good.
Conclusions. Treatment tactic for pregnant women with acute IE that require heart surgery is always a compromise between the treatment and rehabilitation of a deep-preterm baby and the intra-operative risks to the fetus. Risk of intervention for mother and fetus can be minimized by a highly professional multidisciplinary team with wide experience in open-heart surgery, competent preparation of women for surgical treatment, conducting intraoperative fetal monitoring, as well as using special parameters of artificial circulation and anesthesia. Primary and secondary prevention of infectious complications in pregnant women at risk of IE is a powerful tool to reduce maternal, perinatal mortality and disability.
INVESTIGATION OF ANTIMICROBIAL AND ANTI-QUORUM SENSING PROPERTIES OF SOME DERIVATIVES OF CEPHALOSPORANIC ACID, CIPROFLOXACIN, NORFLOXACIN, AND PENICILLANIC ACID
Authors: HAMİDİ Sanaz , TÜFEKCİ Enis Fuat , DEMİRBAŞ Neslihan , ÜNVER Yasemin , KILIÇ Ali Osman 
Published: January 2020

Objective: The rapid increase of
antibiotic resistance among bacteria is a serious public health problem.
Studies have focused on the discovery of new antibiotic molecules and the
development of new therapeutic strategies to combat these resistant bacteria.
Once it was known that pathogenic bacteria regulate synthesis of virulence
factors by the quorum sensing (QS) mechanism, QS inhibition became an
attractive target for antibacterial treatment. This study aimed to investigate
the antimicrobial activities and anti-QS properties of 16 derivatives of
cephalosporanic acid, ciprofloxacin, norfloxacin, and penicillanic acid. Methods: Antimicrobial activity of the
derivatives was tested by the agar well diffusion method against various
microorganisms. The minimum inhibitory concentration (MIC) of effective
derivatives was assessed by the broth microdilution method. Anti-QS properties
were investigated using the soft agar method, observing inhibition of violacein
production in Chromobacterium violaceum.
The data were compared statistically.Results: Six norfloxacin derivatives
displayed antimicrobial activity against a number of organisms, three of which
were more effective than control antibiotics (p&lt;0.05) against some organisms. One ciprofloxacin derivative
demonstrated antimicrobial activity against all tested bacteria and was more
effective against some bacteria than control antibiotic (p&lt;0.05). The MIC values
of these six norfloxacin and one ciprofloxacin derivatives were between
0.04–6.25 µg/mL and 0.04–3.12 µg/mL, respectively. A cephalosporanic acid and a
penicillanic acid derivative displayed anti-QS properties.Conclusion: This study shows that some new
derivatives of cephalosporanic acid, ciprofloxacin, norfloxacin, and
penicillanic acid may have potential for development of new antibacterial and
anti-QS agents.
National Sovereignty and Popular Overeignty in the Making of Finnish Independence and the Civil War of 1918
Authors: Liikanen Ilkka 
Published: January 2020

In the following an attempt is made to summarize the basic lines of the academic discussion on the character of the Finnish civil war. I pose some questions concerning the nature of the conflict in terms of modern politics. Following the recent discussion on the contradictions of modern political culture, I will ask to what degree the war can be understood in terms of conflicting patterns of national sovereignty and popular sovereignty.
In terms of historiography, the nature of the civil war of 1918 was defined during the interwar and Cold war periods mainly in two opposing ways. In the hegemonic academic tradition, the war was interpreted as a fight for national sovereignty, as the ‘war of liberation’. In the discourse close to the labour movement, the conflict was conceptualized as an internal matter, as a social conflict or a ‘class war’. First from the 1960s on, there have appeared new interpretations that have tried to cover both aspects of the crises and reassessed in what sense the war can be understood as a struggle for national sovereignty and to what degree it should be seen in the context of an internal social and political conflict.
The First Occupation of Vilnius During the Great Northern War (April-May 1702)
Authors: Sliesoriūnas Gintautas 
Published: January 2020

This article seeks to reconstruct the military actions and the diplomatic initiatives connected with the first Swedish occupation of Vilnius, the capital of the Grand Duchy of Lithuania, during the Great Northern War.
In this study primary sources were used – the correspondence of the chief leaders of the army of the Lithuanian Republicans. This allowed a revision of previous assertions found in historiography, which were usually based on the diaries and memoirs of contemporaries.
Multivariate analysis of soybean genotypes
Authors: Singh Pallavi Kumari , Shrestha Jiban , Kushwaha Ujjawal Kumar Singh 
Published: January 2020

The experiments were conducted using randomized complete block design with three replications at the research field of Agriculture Botany Division, Khumaltar, Lalitpur, Nepal in 2016 and 2017 to evaluate sixteen soybean genotypes using multivariate analysis. The results showed the significant (p <0.05) differences among genotypes for plant height, days to maturity plant and hundred seeds weight and grain yield. Cluster analysis based on these traits, sixteen soybean genotypes were divided the genotypes into four clusters. The soybean genotypes grouped into cluster 1 showed the highest value for days to maturity. The genotypes belonged to cluster 2 had the highest values for grain yield and plant height. The principle components analysis showed that PC1 and PC2 having eigen values the highest than unity explained 76.6% of total variability among soybean genotypes attributable to plant height, days to maturity, number of pods/plant, 100 seed weight and grain yield. The genotypes showing wide diversity in cluster and principle component analysis can be used as parents in hybridization programs to maximize the use of genetic diversity and expression of heterosis and develop high yielding soybean varieties.
Facile preparation of single phase high-entropy oxide nanocrystalline powders by solution combustion synthesis
Authors: Xiang Hou-Zheng , Xie Hong-Xiang , Mao Aiqin , Jia Yang-Gang , Si Ting-Zhi 
Published: January 2020

Abstract
High-entropy oxides (HEOs), due to their excellent physicochemical properties, have attracted extensive attention. In this work, the solution combustion synthesis approach was applied to prepare a series of porous single-phase HEO nanocrystalline powders. Equiatomic (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O, (Cr0.2Fe0.2Mn0.2Mg0.2Zn0.2)3O4 and (Ce0.2La0.2Pr0.2Sm0.2Y0.2)O2 were successfully obtained. While the former two could be stabilized into single rock-salt (Fm-3m) and spinel (Fd-3m) structures, the latter could be synthesized to have either CaF2-type (Fm-3m) or CaF2-related-type (Ia-3) structure depending on synthesis temperature. Furthermore, their chemical and microstructural homogeneity was further confirmed.
Сontent, Components and European Tendences of the Future Foreign Languages Teachers’ Professional Training
Authors: Kotsur Sabina 
Published: January 2020

The article analyzes different approaches to the «professional training of a teacher» definition as a system of organizational-pedagogical measures and vocational training systems; a critical study, the improvement and experimental use of ideas; the purposeful, systematic and organized process of pedagogical influences; qualifications in the process of studying in the corresponding direction, specialty, educational program; systems of special knowledge, abilities and skills, competences, qualities. The peculiarities of the professional training of future foreign languages teachers are defined by the author as: a possession of units of a foreign language and the ability to use them in specific situations of communication; a consistency of the initial level of foreign languages knowledge received at school with the goals and objectives, methods and technologies of forming the personality of a student as a future specialist in the process of vocational training; the ratio of theoretical and practical training, special and psycho-pedagogical, methodical preparation; a symmetrical study of two foreign languages and bilingual life (Ukrainian and Russian); knowledge and appreciation of the cultural characteristics of a nation, the language of which is studied.
The author also proposes the definition of the concept of «professional training of future foreign language teachers» as a dynamic system of organizational and pedagogical influences, which is characterized by the unity of goals, content, methods and technologies of professional training of students, which study foreign languages on a multi-lingual basis, and foresees the formation of readiness for their professional activity, a professional competence. The article deals with important components of the future foreign languages teachers’ training such as: the theoretical and linguistic training; the practical training; the professional-oriented theoretical training; the methodical one.
The article analyzes the tendencies of future teacher training in the European region. Among the modern European approaches to foreign language teacher training, the author highlights the following main trends: the unification of requirements for professional training in the process of higher education integration into European educational space; the updating of goals and content of studying and teaching foreign languages, changing educational programs and state standards taking into account common European trends; the transition from the knowledge concept to the competence paradigm in higher education; the internationalization of education; the use of new flexible technologies in the study of foreign languages, the strengthening of the practical component of vocational training.