bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrated Uncertainty Quantification for Development Planning of a Large Field
Authors: Budilin Miroslav , Nurullina Aliia , Koryuzlov Andrey , Aldana Wilfredo , Bernuzzi Nestor , Arnez Roberto , Muryzhnikov Anton , Smirnov Ilya , Eydinov Dmitry 
Published: October 2016

Abstract
Oil companies invest significant human and money resources on decisions about field development planning. Often these decisions have to be made based on limited information under tight time constraints. Historically, numerical simulation is one of the main tools in the process. In most cases, the investigations remain limited to single realizations or at best for several representative model cases. However, in order to make reliable decisions about field development the whole range of possible realizations has to be taken into account.
Ideally, a complete study of production forecasting has to include all types of uncertainty in the reservoir: the structure model, reservoir property distributions, fluid properties, well parameters, etc. But unfortunately an extensive volume and complexity of simulations, limited project time, limited hard and production data, great number of uncertainties, and wide range of initial fluid properties make the problem extremely challenging. In reality even detailed uncertainty studies include only several geological model realizations and a few of the most sensitive parameters at the simulation model level.
In this work, we consider a practical case of an integrated uncertainty assessment study for a large multi-layered oil field with more than 200 projected wells. The workflow applied includes various uncertainties from different conceptual steps: reservoir structure, reservoir properties, absolute and relative permeability parameters in the simulation model and well productivity parameters that represent technological uncertainties. The key objective of the project was to locate conceptually different models that match historical production data and carry out a detailed investigation of the prediction scenarios for the next 25 years on the field level and optimize the development plan based on multiple history matching solutions. The project team has built a unique assisted history matching workflow that allows to have multiple solutions to the problem. As a result of several series of simulations, 83 different realizations of the model with equally good match quality were found. These models were used as the basis for probabilistic forecasting and optimization of various development scenarios with account for uncertainty.
Incremental Oil Recovery Due to Low-Salinity Waterflooding: Pervomaiskoye Oil Field Case Study
Authors: Akhmetgareev Vadim , Khisamov Rais 
Published: October 2016

Abstract
The objective of the paper is to assess incremental oil production due to low-salinity waterflooding (LSW) in the Pervomaiskoye oil field operated by PJSC TATNEFT vs. conventional waterflooding by high-salinity water. In this field, low-salinity water has been injected for a relatively lengthy period enabling to assess the effects of low-salinity flooding.
The procedure was as follows. Laboratory coreflood experiments included preparation of cores, their saturation with formation water and oil, core flooding using high-salinity and low-salinity water. In both cases, oil production was recorded and fines release was analyzed. Core test results were adjusted using a special numerical fines migration model, and relative permeabilities were calculated. Then a 3D model was built and history matched using the function that allows change of relative permeability to water. After this, the model was recalculated without this function and incremental oil production due to LSW was estimated.
3D modeling showed that cumulative additional oil production due to LSW in Pervomaiskoye oil field is 4.2 million m3, incremental oil recovery is 3.5 %. The effect was prominent in wells with wellstream water cut from 20 % to 90 %.
Targeted application of LSW is recommended – in injection wells as an EOR method when wellstream water cut ranges from 20 % to 90 %, and in production wells as a water control technology.
Screening Evaluation of EOR Methods Based on Fuzzy Logic and Bayesian Inference Mechanisms
Authors: Suleimanov B. A. , Ismailov F. S. , Dyshin O. A. , Veliyev E. F. 
Published: October 2016

Abstract
The choice of Enhanced Oil Recovery methods for specific reservoir conditions is one of the most difficult tasks for a reservoir engineer. Taber gave informative overview of Enhanced Oil Recovery research history. He also offered technical screening guides for Enhanced Oil Recovery nowadays known as Taber's tables. It should be noted that the approach recommended by Taber could not be taken as strong mathematical ranking of Enhanced Oil Recovery methods.
This paper proposes approach for Enhanced Oil Recovery methods selection, based on fuzzy logic, possibility theory and Bayesian inference mechanisms. Ranking made by way of best Enhanced Oil Recovery method selection for every criteria using fuzzy intervals comparison. Final correction of each Enhanced Oil Recovery selection coefficient performs by the generalized Bayesian inference mechanisms.
Application of this methodology for reservoir conditions of Alberta oil field allowed choosing the most effective EOR method, confirming the accuracy and feasibility of the proposed approach.
Modeling and Optimization of Waterflooding in Gas Condensate Reservoirs
Authors: Abdul-Latif Benson Lamidi , Dziwornu Christian Kwesi , Phu Ha Nguyen , Riverson Oppong 
Published: October 2016

Abstract
Most secondary recovery projects are usually not commenced in a gas or oil reservoir until dictated by the reservoir depleting pressure or by the gas-oil-ratio (GOR) or declining productivity index of the reservoir. During this process it is required to effectively disperse an injection pattern to prevent the oil banks from fleeing away from the production wells. Gas condensate reservoirs usually are produced using primary depletion techniques, which averagely is inefficient for producing the valuable liquid components in the form of condensed liquid. Though the most common approach used to improve liquid productivity in gas condensate reservoirs is the method of recycling produced gas through the reservoir, this technique is economically not friendly due to the fact that larger discounts are usually applied on gas sale values for delayed selling. This paper presents a technique of improving liquid productivity in gas condensate wells by keeping the reservoir pressure above the dew point pressure. Water injection in a gas condensate simulation model with equal well spacing patterns in five- and seven-spot developmental patterns is used.
Simulation results showed that continued water injection resulted in optimum hydrocarbon recovery of 15% and 27% respectively of initial mass higher than primary depletion for gas condensate reservoir with condensate gas ratio of 190 STB/MMscf and 300 STB/MMscf. These results vividly demonstrate that waterflooding of gas condensate wells can perhaps be used as an effective improved oil recovery technique.
Integrated Study of Thin Sections: Optical Petrography and Electron Microscopy
Authors: Varfolomeev I. , Yakimchuk I. , Denisenko A. , Khasanov I. , Osinceva N. , Rahmattulina A. 
Published: October 2016

Abstract
The aim of the work is the study of structural and textural parameters of sedimentary rocks with application of wide complex of modern technical instruments including mathematical and software methods for data acquisition and processing. We have considered the capabilities of investigation of mineral content and its spatial distributions in thin section by using of two imaging techniques with different resolution and nature of registered signal. It confirmed the need for complementary study of the data of various physical methods.
Using the Scattered Waves for Detecting the Fractured Zones in Cambrian Sediments in the Southern Part of the Siberian Platform
Authors: Anokhina E. , Erokhin G. , Kirichek A. , Nazarova M. 
Published: October 2016

Abstract
Scattered waves detection of fractured zones in the high salinity waters dolomite layers of the Lower Cambrian saliferous-carbonaceous complex which are characterized by higher than normal formation pressures. When hole boring in the fractured zones, catastrophic drilling mud absorption, gas ingress, casing columns crush in some wells are observed. Identification of such zones when designing and building wells will allow avoiding complications and damages while drilling.
Capabilities and Limitations of Electromagnetic Techniques in Eastern Siberia
Authors: Oshmarin R. A. , Ostankov A. V. , Kompaniets S. V. , Tokareva O. V. 
Published: October 2016

Abstract
Transient electromagnetic soundingmethod (TEM) is a part of the surface geophysical methods' combination for the south of Siberian platform sedimentary cover studies and oil-and-gas exploration tasks' performance. The region's geological cross-section is beneficial in terms of its studying with the use of electromagnetic sounding as the cumulative conductivity does not exceed 30-50 S, and the horizons that build it up show contrasting geoelectrical properties (Mandelbaum, 1983, Pospeyev, Buddo, Agafonov 2010).
The work represents the evolution of approaches to TEM data interpretation as case study of one of the typical fields Nepsko-Botuobinskaya zone, defines the ways and possibilities of increasing the electromagnetic research resolution, shows approaches of TEM data analysis base on integrated interpretation with CDP data.
Based on the acquired experience, uncertainty analysis, verification of predictions, the authors concluded that the key capabilities and limitations of the TEM due to both geological factors and physics TEM method. It also considers opportunities of resolving the associated tasks of tectonic dislocations', salinity zones' and basement noses' studies.
Features of Thermo-Hydrodynamic Processes in Horizontal Wells with Variable Trajectory
Authors: Valiullin R. , Sharafutdinov R. , Yarullin R. , Ramazanov A. , Sharipov A. , Khabirov T. , Nizaeva I. 
Published: October 2016

Abstract
Planning, conducting and interpreting production logging data of operating horizontal wells is a complicated problem. It is accounted for by special aspects of thermo-hydrodynamic processes taking place under the conditions of a complex wellbore trajectory with uprise, horizontal and topdown sections that affect the distribution of phasal velocities and position of interphase boundary. There are favourable conditions for countercurrent flow to be formed in the uprise sections which distorts the readings of a flowmeter and forms atypical distribution of temperature field in the flow. It is impossible to take into account complex influence of these factors using only deduction and gained experience. Thus, it is essential to apply mathematical modeling when interpreting thermal hydrodynamic data of operating horizontal wells.
Mathematical models for calculating holdups, velocities, temperature distribution of cocurrent and countercurrent oil-water flow are considered in present paper. The results of calculation and their analysis are presented in the work, the results of well surveys are being discussed.
Determination of Invaded Zone Properties from Time-Lapse Induction Logging Measurements Based on Invasion Simulation and Electromagnetic Modeling
Authors: Podberezhny M. , Polushkin S. , Marketz F. , Makarov A. , Sviridov M. , Mosin A. 
Published: October 2016

Abstract
The Salym Petroleum Company uses a perforated liner to complete horizontal wells. Selection of the chemical composition of the mud, as well as an appropriate strategy for the future development of the well, requires knowledge of properties of the invaded zone. The main objective of the study was to determine the evolution stages and properties of an invaded zone using induction logging while drilling (LWD) and repeated LWD measurements. For this purpose, numerical modeling of the invasion zone evolution and modeling of the induction logging signals were performed.
The modeling showed a good correlation between LWD measurements taken at different times after reservoir drilling. We confirmed that invasion zone evolution modeling enables determination of the true properties of the uninvaded formation and further optimizes well development. Specifically, evolution of the invaded zone can be studied by using sets of induction LWD measurements acquired at different times.
High Gas-Oil Ration Separator Units
Authors: Andreeva V. R. , Ivashov A. Yu. , Kotin K. A. , Voltsov A. A. 
Published: October 2016

Abstract
The aim of this work is to analyze the separator unit design advantages and disadvantages for fields with high gas-oil ratio.
As a matter of course the following tasks have been set: –Analysis of the commonly accepted design, consisting of three separate units: preliminary gas treatment device (PGTD), two or three phase separator and the gas separator;–Analysis of the two modernized input separation unit design approaches suggested by authors.
Operation of oil and gas-condensate fields is complicated by significant gas factor and the slug or plug flow. According to the commonly accepted design, at the beginning gas-liquid mixture (GLM) enters preliminary gas treatment device intended for extraction of free gas released from the well stream in the pipeline and for liquid pulsations removal.
After preliminary gas treatment device gas, oil and mixture flows in three phase separator. The gas released in PGTD and three phase separator flows to cleaning from capillary liquid in the gas separator and then distributed to the consumers.
The disadvantage of the commonly accepted design is significant metal consumption and large size of the site.
The advantage of this design is the ability of one separator shutdown without stopping another.
Instead of PGTD, three phase and gas separator standalone usage, authors suggest to use a combined input separation unit, modifications of which are discussed below.
For each option PGTD has been improved, it began to play the role of the input inclined pipelines.
The first option is for gas condensate fields. Gas-liquid mixture flows through preliminary gas treatment device to centrifugal gas separator (GSC) located directly on three phase separator, which immediately separates and cleans gas from liquid that is drained by gravity force into the underlying vessel.
The second option is designed for oil and gas fields or oil with high gas-oil ratio. A key feature of the second modification from the first is the flow of a GLM after preliminary gas treatment device not to a GSC, but to a centrifugal input device that is made in form of cap installed on three-phase separator and designed for gas-liquid separation. Final cleaning of gas takes place in the centrifugal gas separator that is also located on unit.
Isolation of Casing Leaks Using Expandable Systems at Lukoil – Western Siberia Wells
Authors: Chertenkov M. , Sorokin E. , Bessel V. , Fomin M. , Mamedbekov O. 
Published: October 2016

Abstract
Production losses attributable to idle well stock were estimated based on the analysis of 2014-2015 oil production data of Russian vertically integrated oil companies (VIOC). It was shown that one of the main reasons for deactivation of wells is production casing leaks during well operation. The oil production losses of Russian VIOC caused by production casing leaks were estimated. A method is proposed to eliminate production casing leak intervals by expandable systems that employ a hydromechanical expansion method. The results of field application in wells of Povkhneftegaz of LUKOIL-Western Siberia and advantages of application of expandable systems for water shutoff are shown.
Anomalous Achimov and Bazhenov Sequence's Modeling
Authors: Laptey A. , Dolmatova S. 
Published: October 2016

Abstract
Optimization of oil field development systems is largely determined by the quality of geological and flow simulation models of deposits of those fields. Building a detailed geological model with the purpose to improve the predictive accuracy depends on the reliability of reservoir properties, completeness of a priori geological and geophysical data for modeling, and mathematical modeling methods used to estimate the 3D-distribution of reservoir properties.
This article describes the aspects of formation of the Achimov targets and intrusion bodies confined to regional clinoform buildups.
When considering the underwater landslide hypothesis of the development of anomalous section areas of the Bazhenov Formation (ASB), a geomechanical model of ASB ([1], Grishkevich V.F., 2015) unit was proposed. It became the basis for the experiments on physical modeling the results of which confirm the underwater landslide hypothesis of formation of anomalous sections, demonstrate the processes of penetration of the Bazhenov Formation by Achimov landslides bodies, the development of the system of regular fractures and separate bazhenite "islands" with a possible lateral shift and vertical cleavage of bazhenite plates. The results of physical modeling are consistent with the 3D seismic materials.
The article suggests the main principles of geological modeling of multilayer targets complicated by the areas of anomalous sections of the Bazhenov Formation. According to those principles, the geological models of Achimov targets (Ach) and its intrusion bodies (J0) of Severo-Konitlorskoye + Severo-Kochevskoye, Imilorskoye + Zapadno-Imilorskoye and Istochnoye, Severo-Potochnoye, and Potochnoye fields were built.
It is recommended to use the proposed principles for the geological modeling of the LUKOIL-Western Siberia LLC fields which are complicated by the ASB areas.
The proposed principles can be applied when creating the structural framework and building geological models of the fields with productive sediments of Achimov interval and its intrusion bodies.
Turbodrill and Screw Motor: Development Dialectics
Authors: Simonyants Sergey L. 
Published: October 2016

Abstract
In Russia oil and gas wells are mainly drilled with downhole hydraulic motors (DHM).
In the second half of the 20th century turbodrills, which are high-speed downhole motors, found wide application in large-scale drilling in Volga-Ural region, and further in Western Siberia. The most commonly used type of rock-cutting tool was a tricone bit with "open" bearings working in high-speed mode. Also, diamond bits were used to penetrate deep hard rocks. More than 80% of wells were drilled with turbodrills at that time. Putting into practice tricone bits with sealed oil-filled bearings required application of low-speed downhole motors, so downhole screw motors now dominated as a bit drive in large-scale drilling, which was also boosted by the introduction of high performance PDC bits. Compared to high-speed turbodrills, downhole screw motors are low-speed motors with increased torque, they are also known as Positive-displacement motors (PDM). Comparison of turbodrill and PDM energy characteristics shows that turbodrill has a so-called "soft" torque dependence on rotation speed, whereas in PDM it is "hard". That is why with PDM, drilling mode parameters are more stable. On the other hand, in the process of drilling and downhole motor wear turbodrill energy characteristic does not change much, whereas PDM demonstrates significant decrease of energy parameters. Furthermore, the level of lateral vibrations generated by PDM is also high, which has a negative effect on the wellbore quality.
Turbodrill and PDM differ essentially, each having specific advantages and drawbacks. However, they are technical means of one and the same drilling method. Today, each type of DHM has its own area of effective application.
Isoprenaline infusion in the peripartum period for a parturient with congenital complete heart block
Authors: Arachchige Nimali Lochanie Puwackwaththa , Liyanage Harshani 
Published: October 2016

SummaryWe describe the successful peripartum management of a patient with isolated congenital complete heart block using an isoprenaline infusion. A 21‐year‐old lady presented in established labour. She had previously been diagnosed with isolated congenital complete heart block but had never been symptomatic and was lost to follow up. Peripartum management was a therapeutic challenge due to the high risk of syncope, convulsions and sudden death from the increased demand on the heart during labour. There are no established guidelines on the management of congenital complete heart block in pregnancy. Our patient was managed successfully with an isoprenaline infusion titrated to achieve a target heart rate of 50‐60 beats.min‐1 so as to comply with the increased cardiovascular demands during labour. We believe that this is the first reported case of isoprenaline use for complete heart block in labour.
Near‐fatal trial of extubation after anterior cervical spine surgery
Authors: Ginz Hans Friedrich , Engel Ingo , Zimmerer Stefan 
Published: October 2016

SummaryWe report a case of a patient who suffered a near‐fatal tracheal extubation following anterior cervical spine surgery. Dislocated surgical material had compromised his airway in such a manner that subsequent tracheal re‐intubation was unsuccessful. Only bag/valve/mask ventilation and emergency tracheostomy saved his life. Although clinical symptoms indicated the possibility of post‐extubation problems, tracheal extubation was still performed. Hypersalivation should be regarded as an early sign of oesophageal and/or airway compromise, and should not be dismissed. Before attempting extubation, these patients should undergo laryngoscopy and radiograph of the cervical spine or computerised tomography (CT) scan to exclude oedema and surgical material dislocation.
Les obstacles à la formation en entreprise
Authors: Solar Claudie , Baril Daniel , Roussel Jean-François , Lauzon Nancy 
Published: October 2016

Pour les adultes, l’accès à la formation reste inégalitaire dans de nombreux pays. Habituellement traité, en France notamment, sous l’angle de la difficulté pour certaines populations (au regard d’un certain nombre de caractéristiques sociologiques) d’accéder à la formation, il est abordé comme variable explicative de la non-participation à la formation. Ce texte se propose, à travers le concept d’« obstacle à la formation », développé plutôt dans le monde anglo-saxon, de montrer que la non-participation à la formation relève de problématiques plus larges. Ce changement de perspective permet de prendre en compte tout à la fois la difficulté des individus à participer à la formation, mais également celles des organisations à favoriser cette participation. Ce déplacement de focale permet de mieux articuler les problématiques individuelles et organisationnelles, d’en comprendre les ressorts et les conséquences, de mieux identifier et catégoriser ces obstacles... permettant ainsi l’accès d’un plus grand nombre à la formation. Une typologie d’obstacles à la formation en entreprise est alors proposée à partir de l’ensemble des travaux qu’il est possible de trouver sur cette question.
Mouvements sociaux et Facebook : notes sur la technosophie
Authors: Osório Severo Denise , Shimizu Helena 
Published: October 2016

Cet article vise à présenter et discuter la notion de technosophie ainsi qu’à identifier les conceptions des membres des « Mobilisations de juin 2013 » au Brésil sur les potentialités de Facebook et les réseaux numériques comme espaces de débat politique. Ainsi, nous cherchons à trouver des interfaces possibles permettant de comprendre les significations des réseaux sociaux dans la société actuelle et d’envisager les moyens de renforcer la participation et la performance des mouvements sociaux. Il s’agit d’un extrait de l’enquête qualitative de recherche doctorale dont les données sont issues d’entretiens réalisés auprès des membres des « Mobilisations de juin 2013 » au Brésil.