bluuebunny/crossref_metadata_2025_split huggingface dataset:
Complex Monge–Ampère equations on quasi-projective varieties
Authors: Di Nezza Eleonora , Lu Chinh H. 
Published: September 2014

Abstract
We introduce generalized Monge–Ampère capacities and use these to study complex Monge–Ampère equations
whose right-hand side is smooth outside a divisor.
We prove, in many cases, that there exists a unique normalized solution which is smooth outside the divisor. Our results still hold if the divisor is replaced by any closed subset.
Developing sociotechnical systems with special focus on quality
Authors: Koschmider Agnes 
Published: September 2014

Abstract
To date, it is not fully understood why people make errors
in the design of business processes. Certainly, one reason is the
boundedness of human cognitive abilities. Cognitive abilities are, for
instance, restricted by the knowledge or memorability of process
modelers. Due to this boundedness people make errors particularly in
large and complex models while similar errors are not made in smaller
and less complex models. My research focus lies in the investigation
of tools and techniques that support users in the design of business
process models in a way that improves productivity and efficiency
(e. g., understanding and implementing the process model). This paper
summarizes three research projects aiming at business process modeling
support. The intention of my research is to contribute to the
understanding of sociotechnical systems, which are an interplay
between humans, information and communication technologies, and
organizations. The first project facilitates support for process
modeling with a recommendation system. Such a system has been
developed in order to assist users twofold in purpose-oriented
modeling of processes. The popularity of such a system increases when
process models are recommended that can be rapidly understood. My
second research project is the investigation of the empirical quality
(i.e. structural and textual properties) of process models. To
motivate users to reuse process model recommendations, process model
reuse must be understood as a common practice and efficient tools and
techniques must be provided, which I tackle in my third project.
Measurement of novel biomarkers of neuronal injury and cerebral oxygenation after routine vaginal delivery versus cesarean section in term infants
Authors: Morel Alexandra Almanzar , Bailey Sean M. , Shaw Gerry , Mally Pradeep , Malhotra Sunil P. 
Published: September 2014

AbstractIt remains unclear if mode of delivery can have any impact on the neonatal brain. Our aim was to determine in term newborns any differences based on mode of delivery in either neuronal injury biomarkers, phosphorylated axonal neurofilament heavy chain (pNF-H) and ubiquitin C-terminal hydrolase (UCHL1), or brain oxygenation values, regional cerebral tissue oxygen saturation (CrSO2) and cerebral fractional tissue oxygen extraction (CFOE).An Institutional Review Board approved prospective observational pilot study of well newborns. Serum pNF-H and UCHL1 levels were measured on the day following delivery. CrSO2 values along with CFOE values were also measured using near-infrared spectroscopy (NIRS) and pulse oximetry.There were 22 subjects, 15 born vaginally and seven born by cesarean section. No difference was found in mean pNF-H (107.9±54.3 pg/mL vs. 120.2±43.3 pg/mL, P=0.66) or mean UCHL1 (4.0±3.5 pg/mL vs. 3.0±2.2 pg/mL, P=0.68). No difference was found in mean CrSO2 (80.8±5.3% vs. 80.8±5.6%, P=0.99) or mean CFOE (0.17±0.06 vs. 0.15±0.08, P=0.51).We found no difference in neuronal injury markers between term neonates born vaginally compared to those born by cesarean section. From a neurologic standpoint, this supports current obstetric practice guidelines that emphasize vaginal birth as the preferred delivery method whenever possible.
Metal-organophosphine complexes: structure, bonding, and applications
Authors: Raj Joe Gerald Jesu 
Published: September 2014

AbstractMetal-organophosphine complexes are very important candidates in homogeneous and heterogeneous catalysis. Many of the organophosphorus derivatives find applications in nanoscale material synthesis as important precursors. Phosphine complexes containing a variety of substituents exhibit tunable optical properties, which can be successfully applied in conjugation with nanoscale materials in solar-cell applications, photovoltaics, and the development of novel nanomaterials. In view of the emerging importance and potential applications of organophosphorus compounds, this review details the fundamental structural, synthetic, and spectroscopic characterization of organophosphines and their corresponding metal complexes. A special emphasis has been given to31P{1H} and1H nuclear magnetic resonance (NMR) spectroscopic analysis.
Detektion fehlender Bonddrähte in Leistungsbauteilen mittels magnetooptischer Bildgebung
Authors: Dietachmayr Florian W. , Hölzl Patrick A. , Zagar Bernhard G. , Nelhiebel Michael 
Published: September 2014

Zusammenfassung
Leistungselektronikbauteile sind in der Lage, Spannungen und Ströme im
Bereich etlicher kV und kA zu steuern bzw. zu schalten. Dabei sind sie
externen Einflüssen, wie zum Beispiel starken Temperaturschwankungen
und mechanischen Erschütterungen, ausgesetzt. Infolgedessen ist die
elektrische Verbindung zwischen dem Substrat und den
Ausgangsanschlüssen von entscheidender Bedeutung. Diese Verbindung
wird üblicherweise durch Drahtbonden hergestellt, wobei der
Drahtdurchmesser von 70 μm bis über
400 μm reicht. Um die Strombelastbarkeit des
Bauteils zu gewährleisten, müssen redundante Bonddrähte verbaut
werden. Damit sind herkömmliche elektrische Tests nicht mehr in der
Lage, einzelne fehlende oder fehlerhafte Bonddrähte zu
erkennen. Allerdings erzeugt jeder stromführende Draht ein Magnetfeld,
welches analysiert werden kann. Dieser Beitrag präsentiert eine neue
Messmethode basierend auf magnetooptischer Bildgebung zur Detektion
fehlender Bonddrähte in einem Leistungs-MOSFET. Dafür wurde ein
Messaufbau auf Basis des Faraday-Effekts entworfen, der es uns
ermöglicht, magnetische Feldstärken im Bereich von
0.10 A/m mit einer hohen örtlichen Auflösung
von ca. 22 μm zu messen.
Successful Application of Through Casing Logging Technology To Increase Oil Production in a Brown Field Well
Authors: Salimov Farid , Plugin Stanislav , Kramer Hermann 
Published: September 2014

Abstract
Oil Producers are challenged every year to keep their companies profitable. The challenge can be met by implementing technologically advanced solutions. One of the solutions widely implemented in West Siberia is drilling side-track horizontal wells. In spite of high efficiency, this approach requires high quality formation information for successful well placement and completion. One of the technologies that provide high quality formation evaluation data through the casing is four detectors neutron-neutron and neutron-gamma QUAD technology.
Refracturing is the Best Way to Develop Hard-to-Recover Reserves in Romashkino Oilfield Conditions
Authors: Khusainov R. , Ganiev B. , Karimova A. , Karpova O. 
Published: September 2014

Abstract
Today hydraulic fracturing is proved to be the most reliable and effective method of well stimulation. Specialists of NGDU are performing hydraulic fracturing efficiently, taking into account the quality of wells selection, introducing mode of treatment in order to provide an optimal geometry of fracture and get the highest production index from every well.
In spite of the fact that repeated hydraulic fracturing is widely spread and used, all works are narrow directed. Considering either treatment results or, vice versa, describe process design. In this work we tried to identify treatment mode dependence, which allows generating required geometry of the fracture in accordance with different factors and then, estimate obtained results of well production increase and incremental ultimate recovery. Refractured wells were chosen for qualitative assessment of hydraulic fracturing to estimate correctness of project modes and treatment result more exactly. It will also allow improving efficiency not only from refracturing, but also from first treatments.
Integrated Workflow To Tackle Heterogeneous Karst Dominated Reservoirs: Kharyaga Example
Authors: Neillo V. , Pauget L. , Neumann C. 
Published: September 2014

Abstract
Kharyaga Upper Devonian oil reservoir, developed through water injection, is part of a highly heterogeneous carbonate platform. Three sedimentary domains can be identified from South to North: a microbial reef-flat, back-barrier grainy shoals and a non-reservoir lagoon. Static and dynamic data gathered since production start-up revealed that the barrier is extensively fractured and karstified and shows a dual permeability behavior. Understanding the distribution of the dual medium is key to successful development of such a complex reservoir.
To capture the relative weight on the flow network of each type of heterogeneity, a new workflow to characterize the dual medium has been developed, including the following steps: karst facies identification from cores and borehole images, comparison of the karst facies over a detailed flow analysis including detailed PLT interpretation; analysis of the facies spatial distribution using various diagenetic scenarios. As a result a new integrated vision of the reservoir and flow system has been consolidated and 3 main emersions followed by a hydrothermal phase have been identified. Each individual emersion generated a complex karst system composed of several components linked to the paleo-topography.
Representing properly such a heterogeneous system was coped with by iterating in order to match the dynamic data. A two-stage modeling workflow was used: (1) fast iteration process using a dedicated stochastic tool which generates karst conduits, constrained by infiltration zone, paleo-water-table and paleo-topography; (2) once the right inputs are captured, the forward modeling workflow simulated the process of dissolution and generated at very fine scale a more complex and more consistent system.
Finally, this work allowed to model different representations of this complex reservoir capturing the range of remaining subsurface uncertainties and consistent with the integrated interpretation of static and dynamic data. It allows to highlight and evaluate quantitatively the stakes of current and potential new development.
Specification of a Geological Structure of Productive Formations According to Seismic Data in the Process of Drilling
Authors: Gurievskih L. A. , Shelepov I. V. 
Published: September 2014

Abstract
In this article questions of specification of geological models in the process of exploitation drilling are considered on the example of geological structure of U1 fomation. Rather often there is a need of specification of a geological structure of oil and gas deposits, and sometimes even a full revision of existing before conception of geological features of deposits.
Mapping of property distribution of formation using dynamic seismic attributes is a widespreaded way of analysis, but it is not always possible to receive reliable dependences between attribute and properties of formation, especially for the deposits having a complex geological structure. Using seismic prospecting data as dynamic and seismo-facial analysis U1 formation was devided into facies according special generation and accumulation conditions and having different reservoir properties. This approach allowed to get reliable correlation links for calculations seismic attributes into effective thickness maps that were used for determination of location of projected wells.
Techniques for Successful Heavy Oil Sampling with Wireline Formation Testers
Authors: Blinov V. , Weinheber P. , Ivashin M. , Novikov S. , Charupa M. , Filimonov A. , Abramov A. , Nizov S. , Kolobanov A. 
Published: September 2014

Abstract
Unconventional hydrocarbon resources are becoming more and more important to the overall world energy picture and Russia is no exception. Heavy oil has long been an acknowledged asset but renewed efforts to replace the aging conventional resource base are focusing increased attention on this often neglected resource. Many of Russia's heavy oil fields were discovered 20-30 years ago and the formation evaluation data from these old exploration wells is often scanty. Quality fluid samples, especially, were almost impossible to obtain. Aside from the very high viscosity that almost precludes fluid movement, the reservoirs were often either unconsolidated sands with low failure strengths or, in rare cases, carbonates with extensive vug and fracture networks. However, with a renewed focus on these reservoirs, quality formation samples are a necessity.
In this paper we show successful approaches using wireline formation testers to acquire heavy oil sample in two Lukoil fields in the Timan Pechora region: Varandeyskoe and Zapadno-Lekeiyaginskoe. These fields have many differences but two important similarities: very heavy oil and a vital need to understand the fluid properties.
Exploring Petrophysical Uncertainties Thanks to Stochastic Well Log Data Interpretation: Termokarstovoye Field Case
Authors: Samotorova Galina , Bronnimann Bruno 
Published: September 2014

Abstract
Nowadays petrophysical uncertainty is taken into account by major western companies for the field evaluation alongside with existing geological uncertainties. Several published papers review and generalize the main theoretical aspects. However, for Russian companies this idea of stochastic well log interpretation is rather innovative. Thus, the main objective of this paper is to represent the Monte-Carlo simulation method, frequently used in Total for the petrophysical interpretation, on the example of Termokarstovoye field. The stochastic interpretation was performed on two cored wells (providing the uncertainty reduction by the presence of core measurements), logged with wireline PEX tool.
Basically the stochastic interpretation follows the deterministic one and tells how much results vary around the deterministic result. Furthermore, the proposed methodology allows the interpreter to determine the most relevant uncertain parameters on which additional measurements or justifications are required to reduce the petrophysical uncertainty.
Following the described methodology it was identified that the main uncertainty on Termokarstovoye field is saturation. Its influence on the final HCPV (cumulative hydrocarbon pore volume) distribution can be decreased by providing the additional analysis on formation water salinity and by resistivity log inversion, which are the two main impacting parameters.
Thus, experience while running the Termokarstovoye practical case highlighted that, firstly, the final petrophysical uncertainty can be explained and justified. Secondly, further recommendations can be made on new acquisitions to later decrease the uncertainty.
Experimental Studies of Surfactant Adsoption Under Conditions of ASP Flooding at West Salym Field
Authors: Volokitin Y. E. , Koltsov I. N. , Evseeva M. Ya. , Nurieva O. A. , Akhatov I. S. , Kovaleva L. A. , Zinnatullin R. R. , Mavletov M. V. , Kudasheva F. H. 
Published: September 2014

Abstract
To minimize risks related to ASP flooding at West Salym field, experiments have to be carried out to study surfactant adsorption in the formation. Initially one should develop a necessary and sufficient list of experiments, as well as their conditions and interpretation of results. Therefore, two objectives were set: 1) determine the adsorption of anionic surfactant blend in static conditions adding NaCl, Na2CO3, and polymer within the working range of concentrations; 2) determine the adsorption rate of an ASP formulation in coreflood experiments for water- and oil-saturated cores under formation temperatrue.
The main reliability criterion for the results was the reproducibility of the surfactants adsorption experiments and achieving adsorption values within confidence interval. That is why, development of the methods that allow both to achive reproducibility of the results, and to identify sensitivity factors, is a critical aspect of the experiments.
The work presents an interpretation of the experiments for subsequent modeling of processes using mathematic simulators with the view to evaluate surfactant losses in formation during ASP flooding. The achieved results allow further optimization of the ASP cocktail and return a realistic value for surfactant losses in the course of its filtration, as well as ascertain the economic risks inherent to the project.
Treatment of Bottom Hole Zones of Production Wells With Oil-in-Water Emulsions To Restrict Breakthrough Gas Production in Yuri Korchagin Field
Authors: Deliya S. , Golenkin M. , Byakov A. 
Published: September 2014

Abstract
This article is based on field data obtained after seven sessions of bottom-hole zone treatment (BHZT) that were performed in horizontal wells in 2013 and featured fresh water and degassed oil injection for the purpose to restrict the amount of produced breakthrough gas.
This article includes the results of monitoring the performance of the wells before and after the BHZT. It contains information about a new approach to assessment of the well intervention techniques (WIT) with consideration of the effect of decreasing the amount of produced breakthrough gas. The article also contains brief information about other methods of eliminating gas breakthroughs applied by OOO "LUKOIL-Nizhnevolzhskneft".
Unification of Approaches in the Study of the Characteristics of Gas-Condensate Systems
Authors: Fateev D. G. , Nesterenko A. N. 
Published: September 2014

Resume
Field and laboratory tests are the source data of formation fluids properties. Any study is uncertain due to imperfectness of the experimental methods and equipment and also due to inaccuracy and errors of measurements. A set of activities aimed at efficient use of the source data of the gas condensate characteristics for mathematical modeling of gas condensate systems has been developed on the basis of analysis and generalization of the results of many surveys of the gas condensate characteristics and the experimental methods and equipment.
Multi-Sensor Technologies for Horizontal Well Production Logging. Current Status and Application Experience in the Fields of Russia
Authors: Valiullin R. A. , Yarullin R. K. , Sharafutdinov R. F. , Ramazanov A. Sh. , Sadretdinov A. A. , Muhkamadiev R. S. , Bazhenov V. V. , Imaev A. I. , Semekin D. A. , Rakitin M. V. 
Published: September 2014

Abstract
Overview of modern well logging methods for research of operating horizontal wells was completed. The possibilities of practical problems solving with the use of application of distributed measurement systems in a horizontal wellbore. Need for mandatory combination of the results of production well logging with mathematical modeling of thermohydrodynamic processes when preparing the final summary was noted. The material contains an examples of production well logging data.
Due to the wide spread of horizontal drilling there are in the global well logging practice areas of work focused on the study operating horizontal wells using multi-sensor technology formed and rapidly developing. Direction of technology development are defined ways of getting information in operating horizontal wells and here are the following ways: Use the remote (or autonomous) downhole tools with distributed across the stream sensors of composition, velocity and temperature moved along the axis of the horizontal section of the well, "scanning" flows under different regimes;Use of several autonomous devices wich are delivered to the fixed depth in the horizontal section of the well with a change in mode of well operation;Use of fiber optic measurement systems, distributed along the length of the horizontal wellbore with the possibility of "instantaneous" temperature record for the entire length of the cable as in monitoring mode, and the mode transients. As additional parameter the bottomhole pressure, and in the future, the acoustic noise distribution is recorded.
The choice of production logging technology depends on the task, geological conditions of the deposit and technical equipment of contractors. Thus, none of the above methods for studying the horizontal wellbore does not exclude the possibility of other approaches, and the areas of effecient use of non-overlapping.
Thus, each of the directions of development of research operating horizontal wells technology has its niche, not limiting the development of existing and newly developed technology solutions. In this case, all methods of horizontal well research combine the need to scan the flow parameters using a plurality of separate (distributed) sensors spaced or transported to a horizontal well.
Development of Microbial Enhanced Oil Recovery Technology for Carbonate Formations: Stage 1
Authors: Khisametdinov Marat , Sokolova Diyana , Fedorov Alexey , Khisamov Rais S. , Ibragimov Nail G. , Nazina Tamara , Babich Tamara 
Published: September 2014

Abstract
Initial stage of development of microbial enhanced oil recovery technology for carbonate petroleum reservoirs is presented. OAO TATNEFT has been successfully employing microbial technology in terrigenous formations for a long time. Results of carbonate reservoir characterization and microbial community analysis show prospectivity of microbial technology development for carbonate reservoirs as well.
It has been found that microorganisms isolated from formation water can produce metabolites with high oil displacing potential when growing on carbohydrates. The main features of microbial method under development are formulated.
Improvement to Wellbore Stability while Drilling Challenging Profile Wells in the Vankor Field
Authors: Kharitonov A. , Burdukovsky R. , Semenikhin I. , Pogorelova S. , Sidubaev S. , Shafigullin R. 
Published: September 2014

Abstract
Various inhibitive additives are used during drilling in the Vankor deposit to stabilize the clay slate, such as Polyacrylamides, Acrylic polymers, inorganic Silicates, Asphaltens and Glycol mixtures. These reagents are used in aqueous slurries to help drill surface casing and process and extract columns.
Complex drilling conditions related to well trajectory, increased penetration speed, and increased rate of locating an instrument at the bottom hole continue to warrant the search for improved tools to better penetrate wells, increase wall stability, and optimize the drilling slurry process. For such reasons, it was decided to perform an industrial test on a new compositional inhibitor with a secondary function as a lube additive and microsealant.
The service company proposed (and the operator supported) compositional inhibitor testing consisting of a dissolved sulfur asphalten mixture in glycol in certain proportions specially developed to increase the efficiency of inhibitive properties and the multifunctionality of an additive.
The testing was applied in a complex well (168° along the azimuth, horizontal projection length of 1,771 m, and a penetration angle of unstable argillites at 63.5°) to help demonstrate the technical efficiency of the new reagent (full dispersion in the aqueous drilling fluid, reduced processing time, and improved productivity of the treatment system) and the practicality of launching it (reduction/replacement of single-component inhibitors) in industrial volumes within Vankor field wells.