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Collaborating Authors
Yatsenko, V. M.
Detailed study of lithological and petrophysical properties of texturally heterogeneous terrigenous reservoirs of Western Siberia (Russian)
Akinshin, A. V. (Tyumen Petroleum Research Center LLC) | Rodivilov, D. B. (Tyumen Petroleum Research Center LLC) | Yatsenko, V. M. (Rosneft Oil Company) | Makhmutov, I. R. (Rosneft Oil Company) | Anokhin, A. V. (Rosneft Oil Company)
The paper examines the verification of existing hypotheses about the structure of thin-layered reservoirs at a number of large deposits of Rosneft Oil Company, located throughout the entire area of Western Siberia. One of the tasks of the work is to verify these ideas about the composition and properties of "clay" elements of textural heterogeneity. Historically, it was believed that clay interlayers inside thin-layered plasto-intersections are interlayers of clays, but later researchers began to express opinions that these interlayers are clined siltstones with a low proportion of pelitic fraction and may contain hydrocarbons. Another important aspect is the degree of uniformity of the sand component of textural heterogeneity, which in classical methods of well logging data interpretation is accepted as homogeneous and isotropic. In addition, textural heterogeneity at some level can significantly affect the anisotropy of permeability, which can significantly affect the processes of vertical migration of hydrocarbons and their accumulation in reservoir rocks. The work analyzes in detail the Vikulov, Achimov, Jurassic deposits and deposits of the Tanopchin formation. The results of unique studies of properties on cubic core samples, non-standard "pieces" from the intervals of thin layering and photo processing are presented. At the same time, these studies are of a massive nature. This allowed us to conclude about the presence of three textural components in reservoir formations: homogeneous coarse and medium-grained sandstone with maximum permeability values for the sample, homogeneous fine-grained sandstones and siltstones, micro-layered clay siltstones. It is shown that such alternation must be taken into account in petrophysical modeling.
- Europe > Russia (0.40)
- Asia > Russia > Ural Federal District (0.15)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.76)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.46)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Central Basin > Kamenny License > Krasnoleninskoye Field (0.99)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Central Basin > Kamennaya Area > Krasnoleninskoye Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Achimov Formation (0.98)
- (2 more...)
Modification of hydraulic fracturing technology for unconventional reservoirs of the Bazhenov formation (Russian)
Ishbulatov, M. I. (RN-BashNIPIneft LLC) | Bortsov, V. O. (RN-BashNIPIneft LLC) | Fazlutdinov, V. I. (RN-BashNIPIneft LLC) | Fedorov, A. E. (RN-BashNIPIneft LLC) | Volkov, M. G. (RN-BashNIPIneft LLC) | Islamov, R. A. (RN-BashNIPIneft LLC) | Yatsenko, V. M. (Rosneft Oil Company) | Toropov, K. V. (Rosneft Oil Company)
If in traditional terrigenous reservoirs organic matter is represented by free mobile oil that migrated from oil source deposits, then the Bazhenov formation simultaneously contains kerogen, hydrocarbon compounds physically associated with kerogen or the mineral matrix, as well as free hydrocarbon compounds that form accumulations of mobile oil in connected and isolated pores. This explains the need to create an unconventional approach to conducting multi-stage hydraulic fracturing on the reservoirs of the Bazhenov formation. The paper considers the experience of performing the multi-stage hydraulic fracturing on the Bazhenov formation reservoirs using low-viscosity fluids in horizontal wells with ball&drop completion. Various approaches to the hydraulic fracturing are described and their modeling is performed in the hydraulic fracturing simulator RN-GRID. The results of design remodeling based on actual data of two horizontal wells multistage hydraulic fracturing are presented. New modified technology of Bazhenov formation multistage hydraulic fracturing, based on gained experience and developed injection method, is presented. The prospects of using the proposed technology are shown, based on the obtained results. The authors give the comparison of the geological and geomechanical conditions in all horizontal wells considered in this paper to confirm the similarity of the conditions. The information presented in this article can be useful for a wide range of engineers searching for the ways of optimizing the hydraulic fracturing processes in the fields, improving the methods to increase the well productivity, reducing the cost of activities to stimulate the production and enhance oil recovery.
Developing market of domestic hi-tech well survey appliances (Russian)
Rakaev, I. M. (Bashneft-Petrotest LLC) | Gadelshin, E. V. (Bashneft-Petrotest LLC) | Khanafin, I. A. (Bashneft-Petrotest LLC) | Basyrov, M. A. (Rosneft Oil Company) | Zyryanova, I. A. (Rosneft Oil Company) | Yatsenko, V. M. (Rosneft Oil Company) | Khasanov, I. Sh. (Rosneft Oil Company) | Osipov, S. V. (Rosneft Oil Company) | Makhmutov, I. R. (Tyumen Petroleum Research Center LLC) | Mitrofanov, D. A. (Tyumen Petroleum Research Center LLC) | Zverev, V. I. (Dukhov Automatics Research Institute) | Khomyakov, A. S. (Dukhov Automatics Research Institute) | Kopylov, S. I. (Dukhov Automatics Research Institute)
Over the past decade the share of hard-to-recover reserves in the structure of oil reserves of Russian Federation has increased by 20%, wherein the production has increased by 15%. Development of conventional reservoirs often requires finding non-standard solutions due to the high level of uncertainty. Particularly in order to decrease petrophysical uncertainty level the hi-tech methods of well logging and the advanced data interpretation approaches are required. In Russian oil and gas industry to accomplish with the challenging petrophysical tasks mostly the foreign technologies have been used. Under the sanctions restrictions conditions the foreign technologies implementation causes certain difficulties associated with evaluation of petrophysical properties of complex reservoirs. To acquire the technological independence in the area of hi-tech well logging methods Rosneft Oil Company starting from 2017 is actively involved in the process of domestic technologies development by providing sites and facilities for pilot field trials and by planning further equipment development concept. Company subsidiaries and design institutes have analyzed over 400 well logging appliances (design specifications and calibration, methodology and bench test data availability), and over 100 pilot field trials results of hi-tech well logging appliances performed on the Company sites. In the course of work the Rosneft experts have been actively communicating with the well logging appliances manufacturers for improving methodology and getting better results. Intensive collaboration between Rosneft Oil Company and the equipment manufacturers pushed on the domestic well survey service to the next level.
- Europe > Russia (1.00)
- Asia > Russia (1.00)
- Europe > United Kingdom > North Sea > Central North Sea (0.45)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Russia Government (0.68)
- Government > Regional Government > Asia Government > Russia Government (0.68)
Method for localizing the Bazhenov formation promising zones (Russian)
Yatsenko, V. M. (Rosneft Oil Company) | Gavrilova, E. V. (Rosneft Oil Company) | Toropov, K. V. (Rosneft Oil Company) | Burakov, I. M. (ROSPAN INTERNATIONAL JSC) | Makaev, R. I. (RN-BashNIPIneft LLC) | Latypov, I. D. (RN-BashNIPIneft LLC) | Kolonskikh, A. V. (National Gas Company LLC)
The Bazhenov formation is the largest oil and gas source formation in the West Siberian oil and gas bearing province, whose reserves are classified as hard-to-recover. The Bazhenov formation deposits are both the most significant hydrocarbons source rocks in the province and an independent oil and gas reservoir. Formation has a complex geological structure, which directly affects the mobile hydrocarbon reserves heterogeneous distribution. Analysis of implementing approaches experience to the unconventional reservoir development regarding to Bazhenov formation reservoirs shows that the reservoirs distribution is characterized by lateral variability and is not controlled by a structural factor. The lack of sure signs of reservoir evolution identifying zones and assessing their productivity is one of the most important risks achieving successful Bazhenov reserves development. The sweet spot zones are interpreted to be laterally limited areas in which the source rock maturity degree is sufficient to form liquid and moving hydrocarbons in sufficient quantities to operate wells that will be profitable. This paper presents a method for localizing Bazhenov formation promising zones which is based on the kerogen transformation model with a prediction of the achievable pore pressure, taking into account the material balance and rock stress. The approach is based on a consistent physical and mathematical model that describes the kerogen conversion kinetics with a subsequent increase in pore pressure in the source rock and the formed liquid hydrocarbons vertical migration into the nearest reservoirs due to auto-fluid fracturing of the clay tight formation-barriers for the oil source rock. The simulation result is visual map of prospective areas for the Bazhenov formation development that allows to determine the priority well drilling areas.
- Asia > Russia (1.00)
- Europe > Norway > Norwegian Sea (0.24)
- Geology > Geological Subdiscipline > Geochemistry (0.97)
- Geology > Rock Type > Sedimentary Rock (0.86)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.86)
- Geology > Geological Subdiscipline > Geomechanics (0.74)
Specifics of Bazhenov formation properties evaluation with complex method using core and magnetic resonance logging data for reservoir porosity determination (Russian)
Fedorova, D. V. (RN-BashNIPIneft LLC) | Astafiev, A. A. (RN-BashNIPIneft LLC) | Yatsenko, V. M. (Rosneft Oil Company) | Kalmykov, A. G. (NIR Foundation LLC) | Novosadova, I. V. (Tyumen Petroleum Research Center LLC) | Bortsov, V. O. (RN-BashNIPIneft LLC)
Nowadays Bazhenov formation is one of the major points of interest for tight oil production in Russian Federation. Bazhenov formation specifics includes complex mineralogical composition varying along vertical and lateral direction, high organic matter content and its transformation products, unusual pore structure and reservoir properties evaluation uncertainty. Bazhenov formation organic matter can be represented both as solid unsolvable in organic solvents kerogen, and as hydrocarbon compounds (HCC). HCC can be in movable or in bound state depending on their composition, position in pore structure and reservoir temperature. Thus, choosing the way of core samples preparation for correct petrophysical properties evaluation, movable fluid amount estimation and usage of core data for adjusting logging based porosity determination method, is a serious challenge. For Bazhenov formation porosity estimation by acoustic log, neutron log and density log, it is necessary to take into account influence of complex composed argillaceous minerals and, especially important to take into account kerogen influence that has contrast physical properties. As an alternative method, magnetic resonance logging can be used to determine porosity. Magnetic resonance logging data must be interpreted using transverse relaxation time cutoff adjusting to appropriate core data to obtain effective porosity.
- Asia > Russia (1.00)
- Europe > Norway > Norwegian Sea (0.24)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.34)
- Geology > Geological Subdiscipline (0.34)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.99)
- Asia > Russia > West Siberian Basin > Bazhenov Formation (0.99)
Aspects of calculating the poroelasticity coefficient for productive formations in the West Siberian oil and gas province (Russian)
Churkov, A. V. (NK Rosneft-NTC LLC) | Rogozin, A. A. (NK Rosneft-NTC LLC) | Yatsenko, V. M. (Rosneft Oil Company) | Demakhin, A. S. (NK Rosneft-NTC LLC) | Kamenyuka, A. I. (NK Rosneft-NTC LLC)
Development of complex reservoirs characterized by poroelastic properties heterogeneity is a special challenge of Rosneft Oil Company. Currently, the company uses a wide range of laboratory methods for studying the deformation and strength properties of rocks. The results of these researches contribute to increasing the efficiency of scientific support for oil and gas fields the development. Many operations for determining the mechanical properties of rocks, such as defining strength limits in various conditions, became a routine. The most general and informative in practice is a comprehensive method of rock strength certificates, which provides the necessary minimum of data on the strength and deformation properties of rocks suitable for further geomechanical and hydrodynamic simulations. However, determination of one of the most important parameters used both in simulating and initial data calculating for geomechanical laboratory investigations (the poroelasticity (Biot) coefficient) requires series of long-term separate experiments. In order to obtain the necessary data it is necessary to determine the deformation characteristics of the core material in various load distribution conditions, which is associated with the complication of the hardware part of the experiment. The Rosneft Oil Company pays great attention to the scientific and methodological support of digital modeling, as well as reducing associated costs. The article presents the method for calculating the Biot coefficient developed by Rosneft. The initial data for the calculation are the results of determining the strength properties of the core, for example, as part of the construction of rock strength passports. This allows you to significantly reduce the cost of laboratory research.
- Europe > Russia (0.94)
- North America > United States > California > San Francisco County > San Francisco (0.15)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Russia Government (0.70)
- Government > Regional Government > Asia Government > Russia Government (0.70)
Influence of rocks creeping deformation on laboratory evaluation of their compressibility (Russian)
Cheremisin, N. A. (Tyumen Petroleum Research Center LLC) | Shubin, A. A. (Tyumen Petroleum Research Center LLC) | Kudymov, A. Yu. (Tyumen Petroleum Research Center LLC) | Yatsenko, V. M. (Rosneft Oil Company)
The article discusses issues related to the assessment of irreversible creeping deformation effect on the compressibility of reservoirs, which, by definition, is considered elastic and is determined in standard experiments. Standard experiments are used regularly in the industry, and the results of these experiments are widely used for hydrodynamic modeling of field development and the hydrocarbon reserves assessment. Laboratory studies of the dependence of effective pressure on reservoir properties and rock samples porosity were carried out. A laboratory complex allows determining permeability with simultaneous measurement of sample deformation under the influence of crimping pressure. In the experiments, core samples of terrigenous deposits of the Tyumen suite of the field in Western Siberia (Rosneft Oil Company asset) were used. It is shown if the phenomenon of rock creeps under a load that exceeds the historical maximum is not taking into account it leads to an increase in uncertainty in determining the rocks compressibility. It is discussed how deformation hysteresis and rock permeability reduction under cyclic changes in effective pressure depend on the method and duration of measurement. The duration of the experiments depends on many factors, including subjective ones, which contributes to an increase in uncertainty in determining the studied rocks compressibility. However, creep tests are often, but not "generally" included in compressibility tests as additional steps. In this connection, it is recommended to conduct a series of test experiments for new and little-studied deposits to determine the possibility and rate of creeping deformation.
- Europe > Russia (0.35)
- Asia > Russia > Ural Federal District > Tyumen Oblast > Tyumen (0.26)
- Oceania > Papua New Guinea > Papuan Peninsula > Central Province > National Capital District > Petroleum Retention License 15 > Pโnyang Field (0.97)
- Oceania > Papua New Guinea > Papuan Peninsula > Central Province > National Capital District > Petroleum Retention License 15 > Elk-Antelope Field (0.97)
- Oceania > Papua New Guinea > Papuan Peninsula > Central Province > National Capital District > Petroleum Retention License 15 > Angore Field (0.97)
- (9 more...)
Scientists have been interested in studying the lithological composition, geological structure and stratification of sections, reservoir properties, saturation, conditions and history of the development of Upper Cretaceous deposits (K2) of the Eastern Caucasus for more than 70 years. The problem of further study of Upper Cretaceous deposits and associated hydrocarbon deposits is very complex and relevant. In previos work the authors showed the similarities and differences of the geological structure and conditions of the development of Upper Cretaceous deposits within a number of regions of the Eastern Caucasus: Eastern Stavropol, the Republique of Ingushetia, and the Chechen Republic. The deposits are differentiated by the depths of their occurrence, the conditions of formation and maturity, the types of reservoirs, the presence of discontinuous faults, the intensity and composition of fluid inflows. The formed mature high-amplitude (over 250-500 m), complicated by discontinuous disturbances of various order, including intrawater dislocations, Upper Cretaceous traps of the Chechen Republic and the Republique of Ingushetia are characterized by initial fluid flow rates up to 200-3000 t/day and practically anhydrous hydrocarbons tributaries. For low-amplitude (less than 50 m) underformed deposits of Eastern Stavropol and Plain Dagestan, not rich in intra-water faults, less representative fluid flow rates (more often under 100-150 t/day) with a high water content at all stages of development are characteristic. The tendency of the dependence of the intensity and composition of tributaries on the amplitude of Upper Cretaceous deposits and a number of other factors was traced by the authors within the Eastern Stavropol territory. The differentiation of "non-standard" traps of the region according to the features of the lithological and stratigraphic structure, the potential of carbonate reservoirs, taking into account the tectonic, geochemical and geological prerequisites for their formation, is carried out. In this article specialists of Rosneft Company and its subsidiary Rosneft-NTC have identified and analyzed the signs of the most promising Maastricht zones of the Eastern Stavropol Region that are relevant when searching for missed traps, planning well interventions and contributing to improving the efficiency of the Company's field development. These features can be applied to other oil and gas bearing areas with similar geological conditions. Also, recommendations are given for optimizing the development processes of immature hydrocarbons deposits in carbonate cavern-crack rocks.
- Europe > Russia > North Caucasian Federal District > Stavropol Krai > Stavropol (0.86)
- Europe > Russia > North Caucasian Federal District > Chechen Republic (0.54)
- Geology > Rock Type (0.68)
- Geology > Geological Subdiscipline (0.68)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Russia Government (0.47)
- Government > Regional Government > Asia Government > Russia Government (0.47)
A comprehensive approach to the re-evaluation of the geological structure of 'low-pore' deposits in a limited set and low quality of initial data on the example of deposits in the Republic of Ingushetia (Russian)
Brailovskaya, A. A. (Rosneft-NTC LLC) | Miroshnichenko, V. V. (Rosneft-NTC LLC) | Oks, L. S. (Rosneft-NTC LLC) | Yatsenko, V. M. (Rosneft Oil Company)
Oil companies today continue to develop a large number of fields discovered, explored and drilled in the last century. In the conditions of old mining provinces, it is most important to increase the reliability of quantitative estimates of calculation parameters, which contributes to the efficiency of searching for missed hydrocarbon deposits, and rational planning of geological and technical measures. Despite the long history of development of the majority of deposits in the southern regions of the country, which include deposits with complex geological structure and complex reservoirs, due to the limited availability of source data sets, simplified and generalized approaches were often used for their step-by-step modeling. To get accurate geological and hydrodynamic models need to have the parameters obtained by the reasonable interpretation of complex petrophysical models, adapted to the limited set and the low quality of the original data, the Process of geological-petrophysical modeling should include differentiation approaches evaluation estimation of parameters subject to radically different geological and technical factors drilling operations and reservoir properties of the same name reveal deposits within the neighbouring regions. Rosneft Oil Company, together with Rosneft - NTC LLC (a subsidiary of Rosneft) implemented a modern geological model of upper Cretaceous carbonate deposits with distribution of "high-capacity" permeable intervals in the fractured reservoir array, based on a preliminary detailed study of the reservoir potential, sedimentation conditions, and geological structure of the deposits of the same name within the Eastern and Central regions of the Republic of Ingushetia and Ciscaucasia as a whole. The proposed methods, correcting dependencies and coefficients can be used for similar carbonate deposits with effective voids of secondary origin and an inefficient matrix of this and other regions with similar geological and geophysical characteristics of deposits, which contributes to a more accurate assessment of the calculated parameters using well logging data, as well as to increase the efficiency of planning geological and technical measures.
- Geology > Ore Deposit Type > Sedimentary Ore Deposit (0.45)
- Geology > Geological Subdiscipline (0.34)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Russia Government (0.69)
- Government > Regional Government > Asia Government > Russia Government (0.69)
Nowadays, complicated due to the increased content of clay matter structure reservoirs have been involved in the development and operation by Rosneft Oil Company. Sometimes widely used in laboratory practice (capillarimetry, routine petrophysical studies) core analysis methods treatment faces a number of significant difficulties and limitations including in extreme cases the complete impossibility of their using in the case of weakly consolidated, highly clay and oil source rocks. It is obvious that the complex terrigenous reservoirs core samples researching process faces certain difficulties, such as partial or complete destruction of samples under repeated exposure, violation of the integrity of the pore space, etc. Integration of research methods in this case is problematic. At the same time, even under such non-trivial conditions, the existing and currently developing method of laboratory NMR-relaxometry is quite capable to solving the problems of determining both the standard set of filtration - reservoir properties and specific ones-determining capillary-bound, structural (bound in clays) and free fluid, phase composition of the saturating fluid and the parameters associated with the above. The employees of Rosneft together with employees of the laboratory complex Rosneft-NTC LLC (a subsidiary of Rosneft Oil Company) considered the possibility of using the NMR-relaxometry method for the rapid assessment of clay content of terrigenous rocks. Based on the results obtained, it can be concluded that a single experiment is applicable by the method of NMR-relaxometry where along with the determination of the above petrophysical parameters, the clay content of the rocks is estimated without additional involvement of particle size analysis data, which helps to reduce time and effort required to laboratory studies.
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Russia Government (0.91)
- Government > Regional Government > Asia Government > Russia Government (0.91)