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7th EAGE Saint Petersburg International Conference and Exhibition
- Conference date: 11 Apr 2016 - 14 Apr 2016
- Location: Saint Petersburg, Russia
- ISBN: 978-94-6282-179-8
- Published: 11 April 2016
61 - 80 of 198 results
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Development of Exploration Project in the Uvat Area, South of Western Siberia
Authors K.Y. Zervando and V.G. SafonovThe report demonstrates the main results of exploration activities within the Uvat project in the last 10 years. The experience of application of the new techniques such as inversion and basin modeling is described. The evolution of ideas about geology and regional petroleum potential of Uvat area is also described.The profile of successful E&A drilling and growth of recoverable oil reserves in 12 years is given, which reflects the efficiency of the geological study strategy for the Uvat project generated by studying the results of exploration activities and scientific and analytical support. This approach can be used on other major projects of the company at an early stage of their development
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Metamorphosis of Geological Conception Seam Structure at a Late Stage of Development
By A.K. BazanovShown how with use of DV Geo (2D/3D geological modeling) many problems was solved, on the example of one of A field pay zone in Western Siberia where incorrect geological view of a structure of object led to emergence of considerable problems in case of field development. In the issue was accepted new concept of a geological structure of object by the subsoil user, concept passed examination of FBU GKZ, reserves of sheet deposit were entered in books
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Structural-Facies Zonation of the Bazhenov Formation in the South Licence Domain of Priobskoe Field
Authors M.A. Ostapchuk and A.E. GavrilovNowadays Bazhenov Formation is in focus of exploration as reservoir. Reservoir quality is the function of structural-facies zonation. In this paper lithological, correlation and structural questions are presented. Zonation is based on three representative wells with full core and extended well log data. First of all, all deposits are described by target classification. Then they are allocated in the different structural or sedimentary source distance zone. In the result all of them are assigned of different level of prospects.
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Increased Utilization of Associated Gas at Field “N” in the Framework of Infrastructure Constraints
Authors A.I. Burykin and M.O. PisarevThe main problem addressed in this study is the lack of infrastructure of field “N”, and the inability to dispose of the entire volume of associated gas that will be extracted from the field in the coming years. The solution must meet the following criteria: 1) The solution should be implemented within 6 months. 2) The method must be as cost-effective. 3) The solution should allow to recycle the maximum volume of associated gas, to reduce the harmful effects on the environment. The classification of the main methods of utilization of associated petroleum gas was build. The best way was recognized method of selling gas with transportation by pipeline. All options for the sale of associated gas were studied. The most cost-effective option is simultaneous sale of associated gas to the Gazprom gas processing plant, Vyngapur gas processing plant and to the Vyngayahskaya compressor station, using existing compressor with a capacity of 170 MMsm3/year and one new compressor with a capacity of 500 MMsm3/year. This option had the highest net present value and index rate of return.
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Hydraulic Fracture and Reservoir Parameters Estimation Based on Production History
Authors B.R. Minnebaev and T.R AkhmedshinHydraulic fracturing is one of the most popular stimulation operations that are used especially for low permeability reservoirs. The technique is based on injection into the well fluid at pressure that is higher than fracturing pressure. Proppant materials are used to maintain fractures in open conditions. Therefore, evaluation of main hydraulic fracturing parameters such as length, height is a relative objective. To achieve these objectives there a lot of techniques occur. Estimation of main parameters of fracture based on production and downhole pressure data on real oil field will be done. The obtained results will be compared with real reports of service companies and analyze. The limitations of that technique are large uncertainties depending on assumptions and absence of pre-fracture data. One of the methods of estimation of hydraulic parameters estimation is based on determination of flow regime that is based on development of diagnostic log-log plots. For this purpose Rate Normalized Pressure (RNP) and equivalent material balance time were used. Production data matching in the software product has been selected as an alternative method of production data analysis. Estimation of fracture parameters based on production data does not require additional investments.
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Selection of the Optimal Technology of Re-Fracturing on Horizontal Wells with Multi-Stage Fracturing at the Field M
Authors M.V. Firsin and E.A. DemidovaIn order to achieve economical profitability from hydrocarbon production from formations a lot of horizontal wells are stimulated by means of multi-stage hydraulic fracturing operations. However, as analysis of production data shows duration of effect after this kind of stimulation is not long, average duration is about 9-10 months. This decline in well productivities leafs to necessity of re-fracturing. Despite the causes of productivity decline, whether it is failures during primary stimulation or natural reservoir depletion, re-fracturing operation allows to restore productivity indexes and attract new recoverable reserves. Basically, two ways to perform re-fracturing are suggested, they are: 1) re-fracturing in existing perforation intervals., 2) re-fracturing by establishing additional fractures between existing ones. Based on the achieved analysis results, a set of recommendations can be made: 1. Using more aggressive design for re-fracturing operation gives higher increase in well’s productivities relative to design of primary stimulation 2. Re-fracturing in existing perforation intervals is not effective with comparison to establishing additional fractures 3. Influence of interference between additional and existing fractures should be taken into account prior to selection quantity of new fractures at re-fracturing operations
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A Study of Miscible Displacement Mechanism of Alcohol Mixture by Coreflooding
Authors F. Srisuriyachai, T. Karnchanamuntana, P. Trinavarat and S. BenjatanontAlcohol flooding is one of miscible flooding techniques and the major benefit over others is that the miscibility can be achieved at very low pressure. The ability of alcohol to create miscibility with both oil and water results in single-phase flow, yielding the maximum flow ability at absolute permeability. Oil soluble alcohol and water soluble alcohol are selected and mixed at appropriate proportion to create maximum miscibility region on ternary phase diagram. From the study, a mixture of methanol and butanol with a ratio of 4:6 results in the best miscibility power in oil-brine-alcohol system. Correction of miscibility due to pressure is performed in coreflood machine and moreover, effects of alcohol slug size and initial oil saturation are investigated. Pressure difference across core sample is observed as it is related to number of flowing phase in core sample. From the experiment, it is observed that alcohol slug size of 0.4 pore volume yields the best miscibility condition as it can prevent loss of miscibility from chasing water. High initial oil saturation is not desirable condition as it can quickly deplete butanol from alcohol slug. Higher portion of butanol would be required in case of high initial oil saturation.
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Development System Optimization on the Basis of Integrated Block-Facial Analysis
Authors D.I. Nigmatzianova, V.N. Sibilev, P.A. Beschasova and A.A. MironenkoTyumen suite deposits of the field T are referred to continental and subcontinental deposition environment and characterized by significant facial variety, high lateral heterogeneity and irregularity of geological bodies. Field - geological analysis of reserves recovery and development current status is conducted using traditional methods on the basis of regions, distinguished as a result of deposit dividing into waterflooding blocks and cells. Such approach do not take into account complex details of field geologic structure, therefore definition of blocks, bounded by facies and injection wells, is suggested. Subsequently, comparison of current and cumulative well performance and reserves recovery in different facial blocks is necessary. On the basis of constructed plots recommendations for the future development optimization of certain blocks should be given. The next aim is definition of geological heterogeneity parameter as a relationship between sweep efficiency coefficient and stream tube length for different facies. Thereafter, on the ground of these functions, select the most effective parameters of approved development system for undrilled areas in the context of technologic and economic performance.
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Impact of Assessment of Oil and Gas Horizons on Reliability of Reserve Estimation
Authors A. Narimanov and L. AlimuradovaIt is well known that the success of any oil company based on the state of the reserves-referenced oil and gas production. The growth of actual reserves, which are ready for their recovery in the near and foreseeable future, is a strategically important task for each oil company and generally for the state. Therefore, it is important to update the estimation of the hydrocarbon potential of the producing fields continuously by using new methods and technologies. In the connection with this, the problem considered in this paper is relevant. Conclusions: - In order to enhance the evaluation of reserves and resources of the fields, the more detailed approach in the selection of evaluation objects. On the example of the horizons examined partly (divided into objects) it is shown the deviation from the accepted reservoir evaluation system Detailed approach also allows to quickly analyze and evaluate different exploitation options for enhanced oil recovery. - Such approach allows to adjust and optimize the process of development and redevelopment of hydrocarbon horizons, and this ultimately affects the economic efficiency of the exploitation (in addition to the clarification of hydrocarbon reserves, explore the nature of saturation in 3D (by area and the vertically))
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Process-Based Benchmark Study on the Johansen Formation Analyzing Compositional and Thermal Effects During CCS
Authors K. Kurgyis, R. Manasipov and B. JeneiThe remarkable increase of greenhouse gases in the atmosphere, particularly carbon-dioxide (CO2) is often assumed as one of the main causes of the climatic changes. A potential short-term mitigation to these is a reduction of anthropogenic CO2 emissions into the atmosphere via capture and geological storage, a process that has been studied over the last two decades. An important aspect of understanding the migration process is the simulation of large-scale projects. The aim of this paper is to examine the effects of the relevant processes occurring in the second phase of CCS on the storage capacity and on the behaviour of CO2 plume in the reservoir: influence of thermal processes on the spreading of CO2, phase transfer (the amount of CO2 in free gas form and dissolved in brine), leakage and the impacts of these processes on the pressure distribution in the field. For this purpose, three subcases were introduced where CO2 is injected into a deep saline aquifer of the Johansen Formation.
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Design And Optimization Of Matrix Acidizing In a Middle East Carbonate Reservoir
Authors H. Jafarpour, D.G. Petrakov, A. Khormali and A.S. GaltcovaOne of the noticeable points for maintaining the reservoir productivity is to increase the efficiency of production by the removal of formation damage. Improving the production and decreasing the skin by dissolving the formation damage and creating new pathways around wellbore are the most important goals of matrix acidizing. In this work, we use the available production history and the accomplished operation on the well in the field for our analysis. The executed actual matrix acidizing operation has been simulated by a software (StimCADE) to estimate and evaluate the well operation after acidizing. In addition, the volume and the injection rate of operation have been optimized with the highest efficiency to minimize the formation damage skin. By comparing the simulation results of actual acidizing operation which have been done with the results of optimized acidizing operation, indicated the positive effect of optimization of matrix acidizing operation on decreasing the skin factor in this case of carbonate reservoir and also indicated that using HCl 28% as the first batch of main fluid and HCl 15% as the second batch of main fluid leads to the best result in this case in decreasing the skin factor.
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Numerical Simulation of the Characteristics of Mud Invasion and Residual Oil Distribution in Low Permeability Reservoir
Authors Y.J. Jiang, J.M. Sun and J.S. GaoThe original distribution of formation fluid around the well will be changed while mud filtrate invades permeability formations. Based on the water-oil phase flow theory and convective diffusion theory, the method ofnumerical simulation is applied to build the formation model for the study of the characteristics of mud invasion in low permeability reservoir, researching the distribution characteristics of salinity, water saturation, resistivity and remaining oil around the well during mud invasion. The numerical simulation results of mud invasion in different permeability formation show that mud invasion depth increases as permeability increases in the same invasion time in low permeability reservoir, and the invasion profile of salinity , water saturation ,resistivity and remaining oil change obviously as invasion time increases. Combined with practical well numerical simulation analysis found that the characteristics and resistivity separation of array induction logging response influenced by mud invasion depth and invasion time.The simulated results show that the distribution of remaining oil have obvious relationship with reservoir fluid property. Correctly understanding the characteristics of mud invasion and the distribution of remaining oil around the well can improve the accuracy in electric logging reservoir evaluation.
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The Principles of Geostatic Modeling of Complex Clay Collectors (as Demonstrated by Modeling North Buzachi Field
Authors S. Istekova and G. ZhylkybayevaThe article covers the issues of creating a detailed geological model of a complex terrigenous reservoir by using the geostatic modeling algorithms. High-precision 3D seismic survey interpretation results, petrophysical core sample analysis and well-logging data were used to address those issues. Complex geological interpretation of entire seismic survey and well data has made it possible to create an updated seismic-geological structural model of the North Buzachi field.
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Discovery of the Gas Field in Slope Turbidites of Northwestern Black Sea Shelf
Authors V.N. Koloskov, O.V. Pinous, D.N. Nadezhkin, A.A. Aseev, M.V. Brichikova, V.A. Gorchilin and M.N. FonchikovaThe northwestern Black Sea represents the region that accumulates the bulk of river drainage sediments (up to 80%) for the entire basin. The key interest is the zone of turbidite sedimentation at the continental slope and near its base, where the most interesting prospects might be localized. The regional analysis was conducted with focus on structural styles, sequence stratigraphy and petroleum systems. The large gravitational slump was identified as the key tectonic element of the area. It demonstrates a series of normal faults in the landward zone and large thrust in its frontal part. The anticipated traps have been related to the roll-over and toe-thrust anticlines. In addition, the large-scale units of basin-floor fans, slope fans and mass-transport complexes have been detected and mapped. As a result of detailed analysis of the 3D seismic data, we have mapped the main and secondary prospects of the area. The key geological processes and factors that have led to the trap formation and possible hydrocarbon fill have been identified too. The drilling of Lyra-1X well has eventually led to discovery of the large gas field with the reservoirs that have been formed in the slope turbidite lobe
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Fractal Analysis of Hydrocarbon Accumulations for Field S Confined to Vyngapursky Bank
Authors M.I. Lezhnina, V.S. Rukavishnikov and A.A. TimirgalinEstimation of hydrocarbon potential is an essential part of the field exploration. It usually involves traditional methods. Nevertheless, there are many alternative methods of quantitative estimation of potential reserves at the particular area nowadays and fractal analysis is one of them. This method of hydrocarbon potential prediction was applied for one of the field confined to Vyngapursky bank, Western Siberia. During fractal analysis volume of undiscovered oil estimated as 54 mln.tons of oil, where Neocomian complex includes 26.85 mln.tons and Jurassic – 19.75 mln.tons of potential oil resources. From the exploration maturity point of view, the Field S is highly studied, up for 90%, while for Cretaceous layers up for 95%, Jurassic layers up for 78%. Jurassic complex was estimated the most perspective over the Field S, since it has 28% of undiscovered hydrocarbons yet, So, this volumes occupies an area, concentrated at seismic anomaly area within the study area, and equals to 78 km2 . The amount of potential accumulations vary from 5 to 52.
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Theory and Practice of Kinetics in Petroleum Systems Modeling
More LessThe work describes the difference between the approaches to estimate the generation potential of oil and gas components of source rocks effectiveness, depending on the degree of maturation. It is substantiated the necessity of chemical kinetics studies of source rocks from core samples and outcrops for petroleum systems modeling. It is shown the much better calibration of the known fields on the Gydan peninsula with the modeled ones of BPSM project in the use of the recovered kinetic of Tanopchinskaya suite.
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Additional Exploration of the Oilfields with Complex Tectonics During Production Drilling
Authors D.V. Borisenok, T.I. Kosarev, F.A. Burkov, R.N. Vasilyev and K.V. GorevThe article discusses the main methods for improving accuracy of the structural model using well data obtained during production drilling. Recommended approaches are used for additional exploration of the structural elements when dealing with tectonically complex oilfields. The examples show how a structural analysis of the well data allows to refine the results of seismic interpretation, calculate and forecast structural parameters for the well planning purposes
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Advanced Reservoir Characterization in a Low Resistivity Gas Play Integrating Surface and Downhole data–Offshore Ecuador
Authors I.F. Fornasier, F.B. Bringer, O.M. Morales, P.D. Delgado, J.R. Rodas, I.D.S. De Santo and S.R.K. RajaThis paper illustrates a very successful application of an integrated workflow including surface and downhole logging, to unlock the hydrocarbon potential of a thin-laminated, low resistivity pay in South America. Unknown water salinity and undifferentiated resistivity across the interval, made the identification of the pay and the estimation of hydrocarbon saturation very challenging. However, the use of tri-axial resistivity induction allowed to identify the presence of thin laminations and the advanced surface fluid logging (ASFL) system proved the presence of hydrocarbons. The combination of these measurements with high-resolution magnetic resonance, dipole sonic scanning and wireline formation pressure allowed to further define the presence and extension of the hydrocarbon accumulation.
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Experience of Implementation of Low-Frequency Seismic Sounding at Exploration Stage in the Samara Region
Authors I.R. Sharapov, A.E. Manasyan, S.P. Papukhin, N.Y. Shabalin, V.A. Rizhov and S.A. FeofilovSeismic survey is the traditional method for prospecting and exploration of hydrocarbon deposits. It is used mostly to define the geometry of reservoir and its porosity and permeability however productivity evaluation of identified local structures still stays unsolved. In the last 15-20 years started the active development of geophysical methods based on the analysis of natural low-frequency microseismic noise of the earth. These methods solve problems of hydrocarbon prospecting. One of such types of microseismic surveys is the Low-frequency seismic sounding (LFS) method. Application of LFS method at the exploration stage within the license areas of OJSC "Samaraneftegaz" in Samara region is conducted since 2011. Designated purpose of LFS surveys on this area is prospecting and supplementary exploration of hydrocarbon deposits also determination of optimal location for further drilling. Efficiency of LFS surveys at the areas of the OJSC "Samaraneftegaz" during the 2011-2013 is estimated 90%. 30 wells have been drilled using the results of LFS surveys and 27 of them confirmed the forecast
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Benchmark Case Study: Development Optimizaton of Synthetic Model of Shestakovo’s Outcrop Using Proxy Modelling
Authors E.M. Sochilovich and N.V. BukhanovIn the presented report the essay for optimizing development strategy of the synthetic outcrop model and estimation of STOOIP using proxy-model has been undertaken. The development relates to the geological model that describes Shestakovo’s outcrop, placed in the West-Syberia region. The described outcrop shows fluvial-deltaic deposition environment, fluvial formation characterized by braided river with layered structure and average petrophysical properties ϕ=25%, k=200mD. For the proxy-modelling application it was necessary to suggest base case development strategy. After conducted analysis, case with horizontal wells and injectors (located out to the OWC) was chosen as base case and further optimization can be provided. Proxy-modelling was run in order to choose location of the horizontal wells that was increase amount of the cumulative oil production. The 15 training and 5 validation data was calculated using universal kriging proxy as most suitable for model complex responses. It was mentioned that boreholes tend to translate the wells to the zones with maximum value of NtG and poroperm properties. The estimation of STOOIP was done using proxy-modeling and through conventional method. The advantages of the proxy consist in the faster and optimal evaluation that can be considered on the large and heterogeneous reservoirs.
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