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Saint Petersburg 2020
- Conference date: November 16-19, 2020
- Location: Saint Petersburg, Russia
- Published: 16 November 2020
21 - 40 of 134 results
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Features of the Temperature Field in a Well with a Multilayer System during Oil Degassing
Authors I. Kanafin, R. Sharafutdinov and R. ValiullinSummaryIn the process of oil production, the pressure in the well and reservoir can be reduced below the pressure of oil saturation with gas, in this case, oil degassing can occur both in the reservoir and the well, and only in the well. The study of mathematical models of the temperature field taking into account the Joule – Thomson effect and the adiabatic effect in the filtration of oil, water and carbonated oil in the reservoir is devoted to the work (Chekalyuk E. B., 1965; Hasan A. R. et al., 1988; Valiullin R. A. et al., 1994; Sharafutdinov R. F. et al., 2017). It is shown that the decisive contribution to the formation of a temperature anomaly at the outlet of the formation is provided by the heat of the phase transition during oil degassing. The paper discusses the features of the formation of the temperature field in the wellbore for a multi-layer system, taking into account the degassing of oil on the basis of mathematical modeling of thermohydrodynamic processes.
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Methodology of Construction of Detailed Digital Model of Structural Surface of the Crystal Foundation of Romashkin Oil Deposit
Authors A. Borisov, E. Andreeva, L. Anisimova, E. Nurieva and A. TitovSummaryGeological stock material on Romashkin oil field, classical method of convergence of structural surface construction, modern digital technologies allow to obtain new geological information and to highlight previously unknown tectonic elements.
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Mechanistic Investigation of in-situ W/O Emulsion Formation During Heavy Oil Waterflooding
Authors M. Salehpour, Z. Sakhaei, R. Salehi Nezhad, M. Riazi and M.R. MalayeriSummaryIn-situ water-in-oil (W/O) emulsion formation is considered as a non-negligible and unwanted issue during heavy oil waterflooding. Low ultimate oil recovery, oil viscosity increase, formation damage, abnormal pressure spikes during the production period and further separation difficulties are known as the major drawbacks of in-situ W/O emulsion formation. In order to overcome the foregoing complications, a precise survey about the mechanisms of in-situ W/O emulsion formation is required. In this work, a series of pore- or micro-scale waterfloodings at room condition along with high pressure and temperature coreflood experiment have been performed to investigate the associated mechanisms of in-situ W/O emulsion emergence in porous media and subsequent formation damage. The outcomes indicate that in-situ W/O emulations formation during high salinity waterflooding in heavy oil reservoirs causes unstable displacement process which yields early breakthrough of injected water at core-scale and low sweep efficiency. More investigations at pore-scale show that the snap-off, water shortcut and emulsion division are leading mechanisms causing viscous emulsion formation. Heterogeneity of porous media plays a key role in intensifying the consecutive W/O emulsion. These emulsions are stable during flooding period which could be ascribed to the natural surface-active components, such as asphaltenes that act as natural emulsifiers.
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Methodological Justification of Russian Galvanic and Electromagnetic Logs Joint Two-Dimensional Inversion with Vertical Resistivity Evaluation
Authors A. Petrov, C. Sukhorukova, O. Nechaev and M. EpovSummaryTwo-dimensional numerical inversion is widely used by leading foreign oilfield services companies to process electrical measurements from intervals of deposits with complex structure. However, its application for Russian electric logs processing is connected with difficulties caused by design features of the logging devices. Previously, we developed and presented software for joint two-dimensional inversion of high-frequency induction (VEMKZ/VIKIZ) and Russian lateral (BKZ) logs. This research is focused on methodological justification of the approach implemented in the software. Using high-precision numerical simulating of BKZ and VEMKZ/VIKIZ signals in three-dimensional models of anisotropic media, we determined the conditions of the two-dimensional piecewise-constant geoelectric model applicability and evaluated the effect of axial symmetry violation on the data processing results. The use of the approach is justified when the well deviates from the normal to the bedding surface up to 15 degrees. With the use of statistical modeling on synthetic and practical data, we have studied the accuracy of the model parameters evaluation. The results show good accuracy of practically significant parameters evaluation in typical for West Siberian terrigenous sections conditions. On the results of the practical data processing we show the advantage of the new approach over the traditional BKZ and VEMKZ/VIKIZ interpretation techniques.
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Pre-Jurassic Basement Tectonics and it's Impact on the Termal Regime of the Tromegan – Agan Interfluve’s Sedimentary Cover
Authors I. Panteleyko and E. RochevaSummaryThe results of refinement of the Tromegan- Agan interfluve fault – block structure are presented. The essential role of deep faults penetrating from the basement into the sedimentary cover in the formation of termal anomalies of the upper Jurassic sedimentations is proved. It is shown that termal anomalies can serve as indicators of fluid- conducting deep faults. The obtained data should be taken into account when searching for both traditional and non- traditional hydrocarbon fields
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Application of Synthesized Silver Nanofluid for Reduction of Oil-Water Interfacial Tension
Authors A. Khalilnejad, R. Lashkari, M. Iravani and O. AhmadiSummaryReduction of interfacial tension with the goal of acheiving miscibility was investigated in this research. The applicated nanoparticle in this research was silver nanoparticle, which was synthesized by green method.
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Assessment of Oil and Gas Potential of the Timan-Pechora Province According to the Results of Regional Geological Study
Authors O. Prischepa, Y. Nefedov and I. BorovikovSummaryThe comparison of hydrocarbon potential, estimated by the method of geological analogy and potential of the zones of oil and gas accumulation as part of oil and gas system showed significant differences for many areas and complexes, which makes to be more skeptical about residual potential of the traditionally rich systems and on the contrary to take a new look at the potential of previously minor geological features. Involvement in the geological study of areas with ambiguous capacity assessments in the Timan-Pechora oil and gas province, using the results and approaches that assess the hydrocarbon potential from genetic positions and the history of its preservation will bring together approaches to the prospects used by subsoil users and ensure the development of the raw material base of oil and gas, which in turn will contribute to the maintenance of production in the region in the long term. An adequate assessment of the oil and gas potential of the region is necessary as for the long-term planning and expansion of licensing areas by state structures that manage subsoil use, and for companies that develop their presence to make fair management decisions.
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Relative Permeability Curves Reversing Behavior
Authors A. Galechan and V. KadetSummaryThe Plastic percolation model of relative permeability allows to note that the behavior of relative permeability curves for power-law fluids depends on differential pore radius distribution function. It was marked that with average pore radius decrease the following tendencies were observed: pseudoplastic fluids relative permeability decreased while dilatant fluids relative permeability increased. This effect was called relative permeability curves reversing behavior. It has physical background but needs experimental confirmation. If it is confirmed there will be the possibility of optimal flooding fluid choice and reservoir development regime correction in case of reservoir fluids rheology data presence.
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Using 3D Seismic Data for Well Drilling Support - Methodological Features and Practical Examples
Authors A. Kozyaev, T. Kurash, R. Fazylov, A. Korotysheva and S. OnuchinSummaryThe work is aimed at generalization the existing methodological developments in the field of using 3D seismic data at the field development stage. As an example, practical examples are given for three objects with different geological conditions. Two objects confined to terrigenous sediment and one represented by carbonate rocks of Proterozoic age. Various methods of analysis of 3D seismic data are used, which include such popular areas as seismic facies analysis, spectral decomposition, analysis of the scattered component of the wave field, inversion, etc. As a result of the analysis of significant experience in the implementation of seismic and geological monitoring at objects with different geological structures, the main goals and sequence of such work are formed. Recommendations are given on the specific scope of work at each stage, methodological features of each stage are described.
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Use of Seismic Modelling to Develop Optimal Processing Procedures for Investigation of Pre-Jurassic Formations
SummaryIn this paper, we present a technology of seismic processing optimization based on full wavefield modelling. We focused on the pre-Jurassic formation of the Tomsk region. First, we designed the model, where we include for typical objects, such as the effusive complex, the organogenic structures, the elements of the weathering crust, cavernous\fractured limestone, cavernous bauxites, and the acidic intrusions. Second, we simulated full-azimuth seismic data for extremely dense acquisition system with the fold of up to 1000. Next, we applied the quality control procedures to confirm that simulated data can be used for the processing, inversion and imaging.
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Hydrocarbon Traps Prognosis of Paleozoic Deposits Based on the 3D Seismic Data (by the Example of O Field)
Authors A. Pozdeeva, A. Volkova and V. MerkulovSummaryCarbonate rocks are typically characterized by low porosity and permeability, but secondary porosity formation in these rocks can improve the recovery of oil. To solve these problems it is proposed to determination of fractured zones and lithology by seismic attributes. The combined use of seismic facies characteristics and fracture distribution in the study area made it possible to obtain forecast maps. Based on these forecast maps were given recommendations for further development.
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Modelling of Fractured Media with the Help of the LSM Model by the Grid-Characteristic Method
Authors P. Stognii and N. KhokhlovSummarySeismic prospecting is a very effective method for investigating different geological media on the presence of hydrocarbon layers. Fractures are often a barrier on the way of exploration of the chosen area. Numerical modelling is one of the ways of solving the problem of investigating the area with fractures. Many scientific works are devoted to studying fractures, there are lots of models for fractures of different length, width. But still, there is no single model for describing fractures. One of the most popular and effective fracture models is the LSM model (Linear Slip Model) of Shoenberg, where a fracture is described by two parameters — length and stiffness. The grid-characteristic method is applied to modelling wave processes. It is quite good for solving the problems of wave impulse spread in heterogenious media. The result of this work is the introduction of the LSM model into the grid-characteristic method. The results of modelling the elastic waves spread in a homogeneous medium with the Shoenberg fracture are compared with modelling a fracture represented by a two-shore extremely thin fracture model. The LSM model is more general, then the result of comparison is very close for the degenerate case of the LSM model.
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Compass for Structural Interpretation (CSI) A Tool for Uncertainty Management in Subsurface Interpretation
By P. KraemerSummaryThe Compass for Structural Interpretation (CSI) is a web-based collaborative tool created to promote more efficient uncertainty management. It was designed to offer the structural interpreter the opportunity to engage on activities that promote bias mitigation and reinforce the application of effective interpretation techniques, such as a-Discussion with colleagues and use of alternative interpretation b-Access to a range of seismic / outcrop examples and experienced colleagues c-Exposition of interpreters to a wealth of sand box experiments and d-Use of a wide range of interpretation and validation techniques. The design of tools to mitigate uncertainties on each knowledge area (structural geology, sedimentology, petrophysics, and reservoir engineering) is a specialized task that only the members of each community of practice can perform. However, the corporative encouragement to create uncertainty mitigation tools and its enforcement along the project sanction processes is a responsibility that remains entirely at corporate level. The slow and late application of the analysis of cognitive biases in uncertainty management is not a minor issue as some expert opinions suggest that the inadequate management of uncertainty is a root cause of low E&P performance at every scale.
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Determining the Wells for Stimulation Treatments using Machine Learning
Authors A. Raztdinov, M. Salimov, M. Kharisov and A. KornevSummaryImplementation of Information Technologies allows increasing the efficiency of the data analysis to support decisions on optimization of oil and gas production. Commonly, the process of determining the wells for stimulation treatments includes a time consuming and tedious step-by-step comprehensive analysis of borehole and production data of each well. Data Mining and Machine Learning are powerful tools for solving this issue. Using Fuzzy Logic with Genetic Optimization allows processing huge amount of data to uncover new patterns and knowledge from existing parameters. Taking into account borehole and production data, a map of the workover potential efficiency is created. Using Data Mining and Machine Learning can reduce the time and risks in the decision making process in the field of optimization of oil and gas production by applying an Intelligent Assistant that allows assessing the workover potential efficiency.
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Evaluation of Hydrocarbon Potential of Eastern Kamchatka by the Results of Modern Geologycal-Geophysical Researches
More LessSummaryA large amount of geological researches has been carried out on the land and offshore of the Kamchatka over the past decade. On the land of Eastern Kamchatka, two parametric wells were drilled – Liginmynskaya (2012) and Ust-Kamchatskaya (2017). In the period from 2012 to 2017, comprehensive geological and geophysical researches were carried out in the Bering sea, covering the Khatyr, Anadyr, Olyutor and Ilpin sedimentary basins, and also on the offshore of the East Kamchatka basin and the Northern part of the Kuril Islands in the Pacific ocean.
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Prediction of promising zones of development of reservoir rocks of the Bazhenov formation based on a comprehensive study of their composition and geological structure
Authors D. Spiridonov and V. KolpakovSummaryThe paper presents the results of lithological analysis of rocks, characterizes the properties and composition of organic matter, identifies potential reservoirs. The results of well testing in the study area and beyond are analyzed. The object of research is the deposits of the Bazhenov suite of licensed areas of LLC LUKOIL-Western Siberia, tectonically confined to the Surgut and Nizhnevartovsk arches of the central part of the West Siberian Plate.
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Russian Lateral Logs in Thin-Layered and Anisotropic Formations: Numerical Simulation and Inversion Results
Authors K. Sukhorukova, A. Petrov, O. Nechaev and I. SurodinaSummaryRussian lateral logging is widely used in Russia to evaluate formations resistivity, but the behaviour of these logs in complex enviroments is still unclear. In sedimentary sections, some formations are interbedding of two rocks with different resistivity, as a result a quasiperiodic layered structure arises. In this case we need to understand how to divide layered sequence into separate layers, and in which cases we can consider it as one anisotropic layer. To answer this question, we performed 2D numerical simulation of the lateral logs, which are sensitive to the vertical resistivity. Models contain a ~5m periodic sequence composed of interlayers. 2D inversion of the simulated logs results in anisotropic parameters close to the values calculated analytically for the periodic structure, even if a large interlay period causes significant logs oscillations. We also simulated lateral logs in a 3D model, which includes a thinly-layered formation crossed by a highly deviated well filled with a low-resistivity mud. Permeable layers contain invaded zones. Logs inversion results to obtaining average geometric mean of the equivalent anisotropic layer horizontal and vertical resistivities. This value corresponds to the dependences known for the gradient probe signal lying in the bedding plane of a homogeneous anisotropic medium.
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Isolation of Brine Aquifers in Carbonate Rocks of Above-Salt Sediments by a Limited Set of Geophysical Studies of Wells
Authors N. Danileva, S. Danilev and N. BolshakovaSummaryThis article is devoted to the method of separation of brine aquifers by complex of geophysical studies of wells in carbonate rocks. The complex geological structure and limited geophysical techniques make it difficult to isolate and trace brine aquifers. There is a need to develop a methodology for the allocation of these horizons for a limited set of geophysical studies of wells with the mandatory allocation of the reference horizon in the section of wells.
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Development of a Pulsed Electromagnetic Sounding Method for Studying the Bazhenov Formation
Authors M. Nikitenko, V. Glinskikh, M. Epov, D. Gornostalev, K. Danilovskiy and I. MikhaylovSummaryThe work is devoted to fundamental research aimed at the theoretical justification of an electromagnetic method for extracting electrophysical and structural information on the Bazhenov Formation as a unique oil-bearing stratum. The current lack of a common approach to its development, as well as the poor efficiency of the existing techniques for interpreting conventional geophysical methods data, necessitates the creation of new breakthrough technologies. We propose a method of pulsed sounding, which has a considerable depth of investigation and can be used in both well logging and crosshole measurements for identifying lateral heterogeneities and spatial localization of oil-promising zones in the interwell region. To study the electrophysical properties of the rocks exposed by subvertical, deviated and subhorizontal wells, highly efficient algorithmic and software tools were developed. They enable simulating pulsed sounding data and estimating the resolution of an observation system. We performed the numerical simulation and sensitivity analysis of the signals in typical models of the Bazhenov Formation, and showed that the new sounding method provides the capability of lateral tracking the top and bottom of the Bazhenov Formation, as well as studying the transition zone in the overlying and underlying deposits.
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Complicated Salt Strata Influence on the Seismo-Geological Model of Subsalt Structures in the Kaliningrad Region
Authors A. Barancev, I. Kerusov, R. Boyarkin, A. Obolenskaya, E. Kalinina, A. Akulenko and O. GubachevSummaryThe report is devoted to the problem of complex geological objects influence on the seismo-geological model of underlying depositions. Complicated salt layer in the Kaliningrad region was studied as an example. Different methods of time-to-depth conversion under foregoing conditions were compared. It was noted that interpretation of prestack depth migration results in depth domain is the most appropriate under complicated seismo-geological conditions. Considering the situation it should be mentioned that in order to obtain the reliable result of deep migration, special attention should be paid to the creation of correct depth velocity model.
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