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Saint Petersburg 2020
- Conference date: November 16-19, 2020
- Location: Saint Petersburg, Russia
- Published: 16 November 2020
81 - 100 of 134 results
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Possibilities of Events Extraction for Seismic Imaging
Authors A. Masjukov, K. Starkov and A. ShevchenkoSummaryWe propose true 3D events extraction in 3D super-gathers with moveout approximation order smaller than in multifocusing or common-reflection-surface stack.
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Optimization of Multifractured Horizontal Well Performance Applying Machine Learning Techniques: Western Siberia Field Case Study
Authors D. Grigorev, B. Belozerov, D. Egorov, G. Shishaev and E. FofanovaSummaryHydraulic fracturing is one of the most beneficial operations targeted to enhance oil production from unconventional reservoirs, and, certainly, the essential criterion of its success is properly planned hydraulic fracturing design. To make it optimal, the specialist should analyze plenty of appropriate data sources and decide which of them have the greatest impact on the outcome. It seems that machine learning algorithms are effective solution to the problem as they help finding hidden correlations between input and output variables (cumulative oil production, in this case) and highlight those which exert influence mostly. It is worth noting that one of the most valuable aspect of such approach is an opportunity to process vast amount of various data, which is directly relevant to the analysis from the engineer’s point of view. The goal of the research is to find the most robust algorithm able to forecast the target variable and define key hydraulic fracturing design parameters.
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Classification of Intrusive Massifs using Technologies «ARM» (for Example, Igneous Complexes in the South of the Verkhoyan-Kolyma Orogenic Region)
Authors K. Fedorova and I. VorobevSummaryMy name is Ksenia Fedorova. I graduated from St. Petersburg State University in 2011. I am now a postgraduate student 2 years of study. I have been working at the BSEGEI since 2006 year.
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Application of a New Machine Learning Method on a Cascade of Fuzzy-Logical Matrices for Petroleum Reservoir Geological and Hydrodynamic Simulation
Authors S. Ursegov and A. ZakharianSummaryThe traditional version of geological and hydrodynamic models is not at all the only possible one, and, moreover, it impedes the development of geological and hydrodynamic modeling of oil and gas fields as a whole, since it is not truly mathematical. Considering the fact that computers do not work with images, but with numbers, the idea arose to develop a new type of geological and hydrodynamic models that have an unusual appearance, but they are more effective for computer analysis and forecasting. Geological and hydrodynamic models of a new type are a cascade of several tens or hundreds of fuzzy-logical matrices. In particular, such an approach can be effective for oil and gas fields with unconventional reserves, which are characterized by serious limitations on the quantity and quality of the source information.
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Miscible Gas Injection into the Reservoirs for Increasing Oil Production
Authors A. Khormali, G. Bahlakeh and M. Rezaei KoochiSummaryGas injection into the oil reservoirs is one of the effective methods of increasing oil recovery. The gas injection into the reservoirs when it is fully or partially miscible with oil is a difficult physical process from the point of view of mathematical modelling. The simulation of miscible gas injection process by the simulator could give a recommendation about the amount of required gas, injection pressure and other technological parameters. In this work, an industrial software was used to simulate the miscible gas injection process for an Iranian oil reservoir. We determined the amount of gas injection, total oil and gas production and oil recovery factor in the various scenarios of gas recycling. The simulation results showed that the amount production gas was less than the injection gas. In addition, the total oil production and recovery factor was a function of the amount of miscible gas injection.
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Role of Paleovulcanism in the History of Formation of Oil Deposits of Romashkin Field
Authors E. Andreeva, A. Borisov, N. Dokuchaeva, E. Nurieva and I. ChernovaSummaryLocal volcano-tectonic structures (paleovulcans) of the crystal foundation of Romashkin oil field had a direct influence on formation and localization of oil deposits in the lower horizons of the sedimentary covering. The task of identifying paleovulcanic buildings can be effectively solved by precision magnetic and gravitational surveys.
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On the Issue of Determining the Porosity of Terrigenous Reservoirs of Deposits of Natural Bitumen and Super-Viscous Oils
Authors E. Yachmeneva and D. KhassanovSummaryThis work relates to the problem of determining porosity in the terrigenous super-viscous oil reserves. Lithological-facies variability is observed in the reservoir, porosity values vary widely (from 8% to more than 30%), lithological differences are represented by both sandstones and weakly consolidated sands. The work used the data of laboratory core studies and geophysical well surveys (formation density logging, acoustic and neutron logging). A comparative analysis of porosity methods with core data did not show satisfactory approximation confidence values. The results of this analysis also revealed that core samples are grouped by porosity according to the following criteria: porosity of less than 15%, from 15 to 20% and more than 20%. The application of acoustic impedance allowed us to obtain positive dynamics in the study. The product of formation density and velocity in comparison with porosity from core data showed a satisfactory petrophysical function. An increase in porosity in the samples with a decrease in the values of acoustic impedance became apparent obviously. In addition, this is the only group of methods under consideration that showed not a chaotic, but a regular change in porosity (all selected classes are clearly grouped). One of the advanced planning of solving the problem of determining the filtration-capacitive parameters is the volume modeling of the reservoir based on the acoustic characteristics of rocks.
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Geological Model of the Northern Part of Odoptu Anticlinal High, Sakhalin
Authors A. Medvedev, V. Morozov, P. Kovtunovich, O. Krovushkina, A. Alymov, V. Poroskun, N. Malyshev and V. VerzhbitskiySummaryFacies and sequence-stratigraphic model of the northern part of Odoptu anticlinal high, North Sakhalin basin offshore has been developed on the base of core, well logs and seismic study. XIII-XXIV HC bearing strata formed mainly in deltaic environment whereas XXV-XXX prospective zones formed in more distal environments of delta slope and associated turbidite fans of the basin floor. Proximal sedimentary environments of the maximum of Dagi and Lw. Nutovo regressions are expected to extent further eastward then it thought before.
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Impact of Architecture Heterogeneity on Confidence in STOIIP Estimation
Authors N. Klimenko, D. Konoshonkin, E. Fofanova, B. Belozerov and N. BukhanovSummaryThe aim of this research is finding a metric of reservoir architecture complexity provided by different depositional environments and further study of its relationship with confidence in STOIIP estimation. As a result, the linear dependence between architecture uncertainty in its numerical expression (information entropy) and confidence in STOIIP calculation is established that makes information entropy a qualitative indicator for assessment of system exploration level. In addition, it was found that information entropy has a logarithmic relationship with amount of information (number of wells) that allows predicting the potential contribution to the removal of uncertainty when drilling a new well and statistical assessment the value and justification of exploration work which can increase the efficiency of decision-making.
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Tools for Managing the Quality of Geological Databases
Authors Y. Vaneev, R. Gizatullin, E. Prokhorova, A. Nurtdinova and R. NasibullinaSummaryThe daily receipt of large amounts of data for processing and further calculations makes their qualitative analysis difficult. Lack of complete, high-quality and timely information can lead to loss of productivity and efficiency of the Company. Therefore, it is so important to analyze the incoming and existing information for availability and quality. This article describes a tool for ensuring the consistency and quality of geological and technological data in accounting IT systems of the Company - a data verification system. Due to the built-in checks, which are based on mathematical and logical calculations, information is monitored for all types of checked data. Improving the reliability of geological and technological data is achieved by reducing the number of errors in the data. Such an approach will provide the most complete understanding of the current state of the database, reduce the time spent on information analysis, make it possible to extract additional value from it, and reduce the risks associated with a lack of quality data. The article describes the mechanisms and principles of creating a verification system for corporate geological databases, which was developed and tested within the Company and has the potential for scalability
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Clarification of the Quantitative Assessment of Hydrocarbons of the Timan-Pechora Province for Past 10 Years
Authors E. Grokhotov, O. Prischepa and A. KuranovSummaryRecoverable resources of the Timan-Pechora province as of 01.01.2018 amounted to 9729.7 million tons against 9406.2 million tons estimated in 2009 (an increase of + 3.4% or 323.5 million tons). Based on the results of the quantitative assessment of the resources, the most promising for HC exploration regions and areas, and within their borders, promising oil and gas complexes, were identified .On the territory of the Timan-Pechora province, mainly oil and mainly gas directions are allocated for a complex of prospecting and evaluation work for oil and gas.
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Variations in Ranked List of Reservoir Analogs as an Effect of Search Preferences
Authors A. Voskresenskiy, M. Butorina, O. Popova, N. Bukhanov, Z. Filippova, R. Brandao, V. Segura and E. Vital BrazilSummaryWe compared variations of the two most relevant and widespread approaches for reservoir analogs: search by manual filtering and search by similarity measures with properties weights. The filtering approach tends to be a conventional way of search which can be easily performed manually by geologists, but its results seems to underestimate and limit the width of possibilities. The similarity approach has a more sophisticate implementation and, therefore, offers a range of additional useful analytics. Sensitivity analysis was performed using SHAP values which opens the way to evaluate the effect of different properties to the resulting list of analogs and revealing causal links between these properties themselves.
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Investigation the Effect of Pressure and Temperature on Interfacial Tension in a Carbonated Water and Oil
By M. KarimiSummaryCarbonated water flooding has several mechanisms. Interfacial tension reduction is one of the important mechanisms of carbonated water flooding which increases the capillary number. the main topic of this paper is to measure the IFT of carbonated water and oil in reservoir. In this study, the IFT of carbonated water and oil at different temperature and pressure is measured by the pendant drop method. The results showed that increasing temperature and pressure decreased the IFT
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Deflected Polygonal Faults as Paleo-Stress Indicator and Tool to Analyze Hydraulic Conductivity in Senonian Reservoirs of Western Siberia (Russian Federation)
Authors P. Kraemer and J. Chevallier-MessbacherSummaryPolygonal Fault Systems (PFS) were identified in seismic in 1994 and afterwards recognized in more than 100 basins in the world. They appear related to radial shrinkage suggested by the hexagonal prone shapes and dewatering evidenced by fluid escape features. Several driving mechanisms have been proposed, however, dewatering and contraction of smectite rich sediments could be of significance for the Senonian deposits analyzed here. The random orientation observed in PFS indicates that the horizontal stress was isotropic over large areas at the time of formation. When the isotropic horizontal stress associated to PFS is modified by anisotropic lateral stress, the randomly oriented polygonal geometry of PFS is re-oriented to parallelize to the principal horizontal stress directions, arrangement called here Deflected Polygonal Fault System (DPFS). It has been observed in 3D seismic related to a large N–S trending E dipping normal growth fault coeval with the deposition of unit NB1 and associated to a corridor of “en- echelon” normal growth faults coeval with the deposition of unit NB2. The analysis of paleo stress trajectories evidenced by DPFS combined with the study of critically stressed conductive faults provides a criterion to define optimum horizontal well trajectories for each specific area.
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The Influence of Macro-Heterogeneity of the Achimov Formation on the Forecast of Well Technological Indicators
Authors A. Zaboeva, K. Zverev, O. Generalenko, A. Naumov, D. Peskova and N. PleshanovSummaryOn the example of modeling the Achimov deposits, it is shown that the underestimation of the facies heterogeneities embedded in the 3D geological model can significantly affect the predictive ability of hydrodynamic models. When creating the geological model, a non-standard method was implemented for direct accounting of indirect information (geometrization of facies zones and elements of sedimentation conditions, taking into account the ratio of facies fractions in the section of the reservoir, seismic data). This allows to reflect all levels of heterogeneity, associated with facies differentiation of sediments. The influence of macro-heterogeneity of Achimov deposits on the forecast of well technological indicators is proved by the results of a computational experiment.
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Features of Potential Free Gas Accumulations Distribution in the Upper Part of Sedimentary Cover of the Arctic and Subarctic Seas
Authors V. Bogoyavlensky and A. KishankovSummaryThe objects of the research were the Laptev, Bering, Okhotsk, Chukchi and Beaufort seas. The research included interpretation of approximately 28 thousand km of seismic CDP sections. In total, for all offshore areas, more than 1700 anomalies, indicating potential free gas accumulations in the upper part of sedimentary cover, were revealed. Statistical analysis of anomalies distribution was conducted. It was shown, that features of potential free gas accumulations distribution are connected with geological evolution of respective regions, and also with cryological conditions.
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The Search for Missed Hydrocarbon Deposits as a Tool to Increase the Economic Attractiveness of Deposits in the Tomsk Region
Authors A. Evdokimova and A. BobrovSummaryThe problem of reproduction and increase of the resource base of hydrocarbons can be solved by analyzing geological and geophysical materials of the Fund of exploration and appraisal wells. In this regard, the prospects have continental deposits of the Tyumen formation, which were developed on the territory of the Tomsk region. The improvement of methods and technologies, increasing oil recovery, allows the development of hard-to-recover oil reserves in formations with low filtration-capacitive properties, which in turn increases the interest in working with these objects.
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Software and Mathematical Apparatus for Induction Logging Data Processing in Vertical Wells
Authors P. Domnikov, Y. Koshkina, M. Persova and Y. SoloveichikSummaryIn this paper, we used an approach to solving the inverse induction logging problem based on geometric inversion. The finite element method was used for the electromagnetic field modeling. The solution of the inverse problem is based on minimizing the residual functional between practical and calculated data. Studies were conducted on the quality of the reconstructed geoelectric models using noise-free data and noisy data. It is shown that when using the proposed algorithms for multidimensional geometric inversions, the distribution of electrical conductivity is generally restored correctly even in the case of noisy data.
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Characterizing Preformed Particle Gel for Enhancing Oil Recovery in High Water Cut Wells
More LessSummaryHigh water cut is a common problem in mature oil reservoirs. So it’s necessary to use methods to control water production. Preformed particle gels (PPG) are one of the useful conformance controlling agents which are prepared at the surface prior to the injection. Acrylamide based PPGs are the most common ones in the oil industry. Their swelling capacity and elasticity is related to their synthesis composition, temperature and salinity . In this paper the effect of these parameters on swelling ratio of PPG is investigated. The results show that increasing the crosslinker amount leads to decreasing the weight loss during purification. Also PPG swelling ratio decreases drastically with increasing crosslinker/monomer molar ratio. Brine salinity and its temperature can also affect PPG swelling capacity such that PPG swelling ratio declines 3 to 10% by adding 5000 ppm NaCl to the water and increasing temperature from 25 to 55 ? C leads to a slight increase in PPG swelling ratio due to thermo-swelling phenomena.
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Reservoir Complexity as a Prediction Tool for Recovery Factor
Authors I. Kitaev, E. Fofanova, T. Deyeva, B. Belozerov, N. Bukhanov and O. MelnikovaSummaryIn this paper we have created a tool for RF prediction based on the complexity of the reservoir. In order to achieve this goal, specialized literature has been studied that describes current approaches to this prediction. A completely new complexity metrics was proposed here, which considered previously unused heterogeneity indices. To calculate RCI, a series of simulation models were built that provided an estimate of the reservoir's RF, which was described by a specific set of characteristics. The obtained correlation of RF vs RCI was verified with data of real fields. It was determined that the synthetic RF was systematically overestimated, which is explained by the presence of an unaccounted reservoir parameter that reduces RF. The relevance of using the proposed tool for RF prediction is in rapid assessment of the potential of the reservoir and examination on existence of unaccounted reservoir features. It also makes it possible to estimate the increase in oil recovery for already developing fields.
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