bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multivariate Asset Assessment: Fast and Reasonable Decision on Oil Rims Development on the Example of a Unique Field in the Arctic Onshore.
Authors: Komin Maxim , Magdeyev Igor , Schulze-Riegert Ralf , Mukminov Iskander 
Published: October 2018

Abstract
The key economic drivers for the development of several oil fields in the North Yamal-Nenets region were the commissioning of the main oil pipeline "Zapolyarye-Purpe-Samotlor", as well as a regional tax exemption regulation applicable to the mineral extraction tax, valid until the end of 2021.
At the same time, the economic decline in 2008 and 2014 forced many oil companies to reconsider their production programs in the region. As a result, geological assessments and operational drilling programs in many fields were postponed, especially studies on complex development sites such as oil rims.
As economic conditions for the oil and gas industry improved, the production activity began to increase. However, a continuation of proven work processes revealed disadvantages to meet short term economic targets. A quick assessment showed that a traditional approach to studying geological structures and assessing the current state of oil fringes would be too time consuming. Long study periods will lead to the fact that the main volume of oil will be extracted beyond the horizon of the tax exemptions, which would make projects uneconomical and jeopardizes the implementation plans for filling the new main oil pipeline.
Ways to Improve the Ensemble Smoothing Method, Taking Into Account the Specifics of the Oil and Gas Fields Production Prediction
Authors: Olenchikov Dmitry 
Published: October 2018

Abstract
Last years, the methods for prediction of probabilistic distributions of oil and gas reservoir development characteristics are actively researched. It is important for solving of risk management tasks. The key problem here is the need to perform the history matching for a large numbers of flow models. The Ensemble Smoothing method is the one of promising approaches to solving this issue. However, sometimes its results are not good enough for real practical cases. In this article the analysis of advantages and disadvantages of Ensemble Smoother method is made and the ways of method improvement are proposed.
Assessment of Reactivated Natural Fractures Influence on Overall SRV During Multi-Stage Hydraulic Fracturing
Authors: Gula Alexey , Bochkarev Alexander , Vishnivetskiy Alexey , Nikitin Ruslan , Ovcharenko Yuri , Alchibaev Daniil 
Published: October 2018

Abstract
This work is devoted to the development of methods for determining the stimulated reservoir volume (SRV) taking into account the contribution of natural fractures hydrodynamically not connected with technogenic one with the example of Western Siberia reservoir. At present, more and more fields with a complex geological structure, including low-permeability reservoirs, require effective technologies for exploitation, which in turn has led to the massive applying of horizontal wellbores and technologies of multistage fracturing. Modeling of multistage fracturing is a complex process that requires an understanding of the mechanical behavior of the formation, cracks and faults. The cracks formed during the hydraulic fracturing change the stress field around it, this effect is called the shadow stress effect. Natural fracturing can have a significant effect on production rates, in particular, on the hydrodynamic connection of the reservoir and the migration path of fluids. If stress shadow effect of the technogenic fracturing is taken into account, then can be additionally taken into account the reactivated natural fractures with induced stresses as well.
In the process of the work, mechanisms of formation of natural fracturing were determined on the basis of seismic attributes and reconstruction of paleostresses, a natural fracture network model was constructed using geomechanical information. The results obtained during the construction of a NFN play one of the key roles for the modeling of the multistage fracturing in fractured reservoirs allows to take into account information on the intensity and direction of development of natural fracturing in addition to mechanical properties: elastic and strength characteristics of rocks.
In this paper, we demonstrate the results of a numerical evaluation of multistage fracturing influence in the change of the stress field. The stress field, modified during the stimulation, was used to assess the critical stress fractures, which allows increasing the stimulated reservoir volume due to reactivated natural fractures. Such cracks do not need to be fixed, since they are formed by sliding along the plane of failure with small changes in the stress field and give an additional contribution to the total area induced fractures.
The demonstrated technique allows to maximize the area of induced fractures and increase the stimulated reservoir volume by taking into account the critically-stressed one.
Fully Coupled Geomechanics Approach to Determine Critical Wellbore Intervals
Authors: Shelkov Vasilii , Bogachev Kirill , Piskovskiy Evgeny , Piatsky George 
Published: October 2018

Abstract
A method to locate critical wellbore intervals during oilfield development is proposed in this article. A variant of fully coupled geomechanics approach is used. Geomechanical 3D modeling is performed on the same mesh that is used for reservoir simulation. The proposed algorithm uses Mohr-Coulomb criterion to locate critical wellbore intervals.
Forecast of Well Drilling Events in Salt Bodies Based on Geomechanical Modeling for Eastern Part of the Orenburg Oil and Gas-Condensate Field
Authors: Galliamova Dilia , Kalinin Oleg , Lukyanov Pavel 
Published: October 2018

Abstract
The paper is dedicated to problem of forecast of well events drilling through nonproductive reservoirs at shallow depths: mud losses, wellbore instability due to salt tectonics, mud and reservoir temperatures difference and drilling time. Problem of forecast in those zones is complicated because of insufficient amount or complete lack of core tests, well loggings and noisy of seismic data.
There is three-dimensional geomechanical modeling was showed with taking into account thermal stresses and time factor in the clay and salt zones on the example of the Eastern part of the Orenburg oil and gas condensate field. Also geological features were analyzed for prediction of mud losses zones.
As a result of modeling, a relationship was found between the drilling mud losses and the wells location with respect to the sides of the salt folds and domes, which are accompanied by the development of natural fracturing. While well is drilling in overbalanced conditions in these zones, fractures and faults become critical stressed, which leads to their reactivation and mud infiltration. The trajectory can not be significantly corrected in the 300-800m depths so well schematic recommendations are reduced to a warning about the zones of possible losses.
Wellbore stability calculation with taking into account the temperature effect shows an increase or decrease (depending on the drilling season) of the stresses, acting on the wall of the borehole up to 10 MPa; the influence in salts is greater than in clays. Taking into account time factor showed that long-term drilling with high mud density can lead to numerous stuck pipes and tight pulles.
The obtained results make it possible to clarify wellbore stability calculations and, accordingly, the intervals of borehole failures. The prediction of critical stressed zones allows to warn the intervals of drilling mud losses. Thus, due to the combination of these approaches, it is possible to reduce the nonproductive time of well drilling and choose candidate wells for an optimized well design.
Organization of New Projects Search and Assessment Process
Authors: Kudryashov Sergei , Ismagilov Azamat , Khamitov Ilyus , Smyslov Vitaliy , Kozhemyakin Anatoly , Sedykh Kira 
Published: October 2018

Abstract
The paper considers the process of searching and evaluating new projects of the Oil Companies. Three main components are distinguished: structure, organization of the process and tool set. The experience of the world's leading oil companies in the organization of this process is considered. The concept of Zarubezhneft JSC is described in the context of selected components. Practical examples from the Company's experience are given.
Perspective Oil Production Planning Based on Static and Dynamic Modelling Fields of PJSC Tatneft
Authors: Loscheva Zoya , Kolsanov Eugenii , Muryzhnikov Anton 
Published: October 2018

Abstract
Article describes main stages and results of oil production perspective business planning of Company implementation based on digigal technologies like static, dynamic and economic modelling. This was inspired by building and integration of key parts like design and analysis system of assets development based on static and dynamic modelling toolkit, which allows to take in accout all existing information; economic model of assets effectiveness evaluation and proposed oil production planning analysis; scheme of investment allocation to assets with oil production growth and advance in economic effectiveness with taking in account ranking of company's risks and constraints. Replication of practical results allows increasing Company stocks growth speed and operating activities effectiveness due to oil production potentisal increase and investment minimization.
Application of Integrated Design Technology to Manage Existing Assets and Evaluate New Projects
Authors: Afanasiev Igor , Ismagilov Azamat , Fedorchenko Gennady , Kozhemyakin Anatoly , Smyslov Vitaliy , Zokhan Grigory 
Published: October 2018

Abstract
The trends of the last decades show that the leading Russian and international oil & gas companies come to a concept of integrated design technology when forming the prospective development programs. Such approach, contrary to the conventional one, allows efficient planning of the asset development with account of its components interference (reservoir, well, surface facilities, economics, license obligations etc.).
The main purpose of integrated design is to ensure comprehensive smart and efficient asset management. The expected results from the application of such approach are: Comprehensive representation of production, gathering, transportation and treatment systems;Making of optimal asset development strategy (short-, medium- and long-term programs);Production and operation processes optimization;Efficient engineering solutions;Minimization of CAPEX and OPEX;Multi-level economic evaluation (from well to asset levels);Minimization of risks and uncertainties.
In 2014 JSC Zarubezhneft initiated the development of integrated design technology with the multiple strategic interests of the company with own efforts to achieve the abovementioned results. As a result, a concept of integrated design technology was formed and a software tool for making integrated models was developed. The concept and softwaretool are the basis for solution of production and investment tasks. The peculiarity of the approach is its universal nature, applicability to the projects at various development stages (exploration, greenfield, brownfield) and with various detailed specification degree depending on the available information.
First Successful Proppant Fracturing Treatment in Cretaceous Carbonate formation in Kuwait
Authors: Nagarkoti Malvika , Pooniwala Shahvir , Alam Anwar , Anthony Elred , Al-Othman Mohammad , Aloun Samir , Buhamad Ali , Ashkanani Meshari 
Published: October 2018

Abstract
Proppant fracturing treatments in sandstone formations are routinely executed in Kuwait, however when carbonate formations are the target, acid fracturing is the preferred treatment method. It has been observed that acid fracturing delivers a high initial production however maintaining a sustainable production rate is a challenge in the tight cretaceous carbonate formations in Kuwait. A production enhancement technique needed to be identified in order to deliver more sustainable production and maximize recovery from these carbonate formations.
Based on global experience it was proposed that proppant fracturing can deliver more sustainable production rate as compared to acid fracturing.
Proppant fracturing had been previously attempted on two occasions in Kuwait, however both the attempts were evaluated as not being operationally successful. Hence prior to executing the first successful proppant fracturing treatment in carbonates in Kuwait a thorough study was undertaken to identify and mitigate the possible risks.
The cretaceous carbonate formations in North Kuwait are relatively shallow and are known to be tight and highly ductile. Due to the ductility of these formations, proppant placement and reduction of the fracture conductivity due proppant embedment were thought to be significant risks. During the course of the project, detailed core analysis and testing was conducted using formation core samples to ascertain the severity of this risk.
Successful execution of this hydraulic fracturing treatment was pivotal in order to plan the future production strategies from these formations. A cautious approach needed to be followed as proppant placement was of paramount importance. Different strategies were incorporated in the fracturing workflow to ensure the success of the treatment and to maximize data collection in order to optimize future treatments and well placement. Multiple mini-fracs, temperature logs and pumping of novel non-radioactive tracer proppant were some of the techniques utilized.
During execution various decisions were taken real-time to ensure success of the treatment. It was observed that all parameters were consistent with the results of the core and laboratory testing conducted during the initial phase of the project which lead to optimizing the proppant placement.
The success of this treatment has been a game changer resulting in more wells being identified as candidates for proppant fracturing in this field.
Now that proppant placement has been established the objective of future treatments is to optimize fracture designs, fluids and treatment schedules which will help the future production enhancement strategy for this field.
Lessons learnt from this first successful well will be applied to future wells planned in carbonate reservoirs in Kuwait, in order to maximize recovery.
Comprehensive Production Evaluation for Gas Condensate at Early Exploration Stage by Using Downhole Fluid Analysis DFA and Numerical Simulation: Case Study from China Bohai Bay
Authors: Zhang Guoqiang , Tan Zhongjian , Hao Zhongtian , Fan Zhao Ya , Chen Ji Chao , Gao Bei , Shelomikhina Irina , Zhang Tao 
Published: October 2018

Abstract
The new gas condensate has been discovered recently in Bohai Bay China, and due to the complex of the fluid behaviour in nature, appropriate characterization of the in-situ fluids and relevant flow testing can provide valuable insight into gas condensate reservoir forecasting. This paper discussed a comprehensive methodology for reliable productivity evaluation with the aid of in-situ fluid characterization and interval pressure testing, and its results as a key factor not only fed into DST design and equipment optimization for better production evaluation design but also can be optimal production prediction for reserve booking. Based on the efficient and reliable productivity evaluation, we can make the real-time decision on whether to carry on DST and which DST equipment should be chosen and where to test it. However, we has been dealing with heavy oil for very long time, and the common DST equipment in Bohai Bay is not designed for condensate reservoir, but heavy oil, plus there were no published case studies in China about DST modification from heavy oil to gas condensate, and what can be done for production forecasting in gas condensate reservoir. In this paper, a new solution was proposed base on the problem elaborated above.
An integrated approach was conducted to overcome challenges by using all available data from Wireline Formation Tester (WFT) and conventional log data. An accurate permeability is always the foundation of a good prediction, a single well model was built by taking full advantage of all permeability information; Compositional model is the best way to simulate the condensate phase change, in this paper, a calibrated composition was deduced by combining with semi-quantitative DFA composition and PVT analysis software (PVTi) via calibrating downhole measured GOR and density; Black oil model is the most common and popular method to evaluated single well productivity, but the uncertainty of condensate viscosity usually leads huge error, based on the calibrated composition results, evaluated the downhole fluid viscosity, after downhole fluid viscosity correctly evaluated, black oil model can also be applied in condensate productivity evaluation.
DST results were used to validate the results from this approach, the error percentage range is around 10% compare with DST results. This new solution has following values: an accurate gas condensate production forecast become possible even without PVT lab results. A quick gas condensate production workflow has been set up for this field; and the methodology applied is not limited to this specific field but applicable to other fields with condensate fluid type.
Prediction Flooding of Well Stock on the Large Gas Fields with Stratified Heterogeneity
Authors: Ponomarev Aleksandr , Shayakhmetov Airat 
Published: October 2018

Abstract
Practically all large gas deposits of Russia are developed on the elastic water-pressure mode. At initial stages of their development owing to a lack of data on a productive layers structure there are considerable uncertainty at creation of 3D geological and hydrodynamic models of a deposit. At the same time relevant regulations on drawing up design and technological documentation provide calculation of indicators for the entire period of development of an object before the fullest extraction of reserves of gas. As practice shows, 3D digital models of large gas deposits are exposed to periodic specification on a measure of replenishment of geological field information what leads to essential change of initial estimates of technological indicators and efficiency of investments. In these conditions gain development and application of proxy models of the bedded systems using the steadiest characteristics of heterogeneity of collectors and geometry of deposits. It is also relevant to use such models for the developed fields at expert assessment of results of 3D hydrodynamic modeling. Simultaneous using of several approaches and tools when calculating process of development will allow to reduce risks and to narrow area of change of probable values of technological and technical and economic indicators of gas production.
Considered methodology assumes creation of zone and layered and non-uniform model of a gas deposit with use of the probabilistic determined approach to distribution of filtrational parameters on deposit model volume. Intake of reservoir water in a deposit happens to plantar water both on bedding, and in the vertical direction taking into account anisotropy of layers. When forecasting flood of a well stock mechanisms of accounting of a variability of wells on gas and water due to selective flood of productive thickness on interlayer, distributions of reservoir pressure in a zone of placement of wells and the differentiated opening of the allocated interlayer of productive thickness in wells are put. Groups of wells on a state are allocated for each timepoint: not flooded, flooded – capable to take out the water arriving from layer and waters, flooded – incapable of full and continuous carrying out. The moment of a spontaneous stop of the flooded wells is defined on the basis of hydrodynamic calculations of a gas-liquid stream in lift columns of wells.
The algorithm is developed and the computer program of calculation of selective flood of productive thickness of a gas deposit and fund of production wells is created. The technique is approved on Cenomanian deposits of the Yamburg, Urengoy and Medveghiy fields. The received results on indicators of stock of flood well satisfactory are coordinated with historical data.
Image-Based Evaluation of Retained Proppant Pack Permeability
Authors: Beletskaya Anna , Chertova Anastasia , Abashkin Vladimir , Willberg Dean , Korobkov Dmitry , Yakimchuk Ivan , Dovgilovich Leonid 
Published: October 2018

Abstract
Design of hydraulic fracturing and flowback jobs involves application of fluid flow modeling. Most of the existing research and commercial flow modeling software utilizes experimentally determined permeability of a proppant pack as an input parameter. These experiments are time- and resource-consuming and have some limitations. To overcome these issues, we propose a new image-based approach for determination of transport properties of a proppant pack.
This approach involves scanning of the proppant pack under reservoir pressure using X-ray microcomputed tomography, construction of a digital model of a proppant pack, numerical simulation of the fluid flow through the proppant pack, and determination of the pack permeability. Based on analysis of streamlines, the impact of damaging material on the transport properties of a proppant pack can be evaluated. This approach is demonstrated and experimentally validated on the two types of sand with different particle size distribution. A suspension of SiO2 microspheres (50 μm) has been used as damaging material.
To validate the suggested approach, the 3D structure of the tested proppant pack is required. This is not possible to achieve using the standard API cell. Hence, a special high-pressure minicell with walls transparent to X-rays is designed and applied in this study for flooding experiments. Experimentally determined permeability reduction due to suspension filtration agrees well with the permeability reduction estimated in the framework of the image-based approach.
Non-Seismic Methods Development at Gazprom Neft
Authors: Grigoriev Gleb , Zakharova Oksana , Liubimov Evgenii , Morozov Nikita , Kasyanenko Anton 
Published: October 2018

Abstract
Field non-seismic methods are one of the strategic directions of geological exploration that can improve the scientific and technical assessment quality of oil and gas prospects of the studied areas. The main advantage of non-seismic methods in comparison with seismic works is the high mobility and low cost.
This article describes various technological solutions in the field of non-seismic methods. Within the framework of the work, perspective directions of development were evaluated and identified, with perimeter of geophysical, geochemical and geomorphological studies.
Seismic and Electromagnetic Methods Integration to Increase a Quality of Reservoir Properties and Saturation Prediction in East Siberia Region
Authors: Mostovoy Pavel , Oshmarin Roman , Ostankov Andrey , Tokareva Olga , Orlova Daria 
Published: October 2018

Abstract
This paper describes a case study of the Chonskaya group of fields to demonstrate an approach to the integration of TDEM electrical and seismic data when building a geological model for improving a reservoir properties and saturation prediction quality.