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This paper is focused on building a model using actual data that links the degree of achievement of the planned rates of new wells with geological, geophysical and technological factors. The goal of this work is to improve the quality of new well production rate forecast by implementing an additional adjustment, derived from the solution of the regression problem to predict the difference between actual and planned (calculated) new well production rates based on given properties of drilling targets and completion technology. Two models based on different machine learning tools were built to solve the stated problem. The difference between planned and actual production rates was chosen as a target function. The first model is a classification model. In this case, the classification problem was solved and the sign of the target function was predicted, then the regression problem was solved for each of the two ranges. The second model is the clustering model. Its main idea was to divide the objects under study into clusters. Then, in each of the clusters, the regression problem was solved. The models were trained on the data on the new wells of Rosneft Oil Company PJSC for the period from 2017 to 2021. As the result of the study, the above two models were used to predict the difference between calculated and actual rates for each of the planned new wells in the period from 2023 to 2027. Furthermore, prediction quality was tested on results obtained from new wells that were drilled within four months of 2023. This test showed an increase in forecast quality for 658 wells sample average rate from 95 to 97−99 %.
The development of hydrocarbon deposits in the Eastern Siberian mega-province is largely determined by the need to replenish the oil and gas resource base of the Russian Federation. In this case a detailed geological study of the fields located on the territory of the Nepa-Botuoba anteclise and the Pre-Patom trough are mostly relevant, in connection with the commissioning of the Eastern Siberia - Pacific Ocean pipelines. It is known that sediment sections within the Siberian Platform are complex geological formations, which is due to the combination of fault-block tectonics with numerous halogen bodies, as well as trap magmatism. At the same time, the identification of similarities and differences in fault-block tectonics at the deposits of adjacent tectonic structures is of the greatest interest. In this article consisting of two parts the similarities and fundamental differences in fault tectonics of the objects under consideration are shown on the basis of sequential paleoprofiling while performing a detailed well-log correlation. In the first part it is shown how the Cambrian halogen-carbonate formations were block-formed along depositional faults with an amplitude of up to 400 meters using the example of the Markovskoye field, on the basis of sequential paleoprofiling. Subsequently, as a result of «keyboard» diving there was an alignment of the previously disturbed productive layers of the Osinsky horizon. In turn at the Yarakta deposit under high pressure and temperatures exceeding 1000°C faults became possible ways for subvertical intrusion of trap magmatism into sedimentary formations in the form of dikes and by subhorizontal intrusion into thin intersalt formations in the form of sills.
Determining the scope of surveys during the construction of vertical steel tanks on weakly bearing soils (Russian)
Chepur, P. V. (Industrial University of Tyumen) | Tarasenko, A. A. (Industrial University of Tyumen) | Kolyadko, A. A. (Surgut Institute of Oil and Gas) | Sukhachev, I. S. (Industrial University of Tyumen)
The article is devoted to the problem of the scope of surveys to be carried out when inspecting construction sites of large-size steel tanks, which are composed of poorly bearing inhomogeneous soils. The information on tank accidents with oil product leakage and the main causes of such accidents is provided. It is shown that non-design loads caused by the process of uneven settling of the tank structure create zones of increased stresses and development of inadmissible deformations, which is the main cause of accidents at oil and oil products storage facilities. The reasons for the appearance of inhomogeneity zones are discussed. It is shown that the main cause may be erroneously planned and performed engineering surveys. The requirements of domestic and foreign regulations in terms of assigning the scope of survey works at the construction sites of large-sized vertical steel tanks have been analyzed. The geometrical approach to determination of probability of survey borehole hitting the inhomogeneity zone having a random location inside the contour of the tank was used. The generalization of previously performed calculations using the finite element method has been carried out and dependences of the acting equivalent stresses on the value of the vertical component of the non-uniform settlement of the central part of the bottom have been obtained. The dependence of the probability of getting a well (wells) into the inhomogeneity zone on the value of the radius of the zone of inhomogeneity for tanks of the most widespread standard sizes of tank is plotted. Conceptual approaches and ways to completely exclude the probability of development of local heterogeneity zones are proposed. One of them is based on application of multiview georadiotomography technology – scanning of continuous media by an antenna array with distributed receiving and transmitting high-frequency antennas of a wide range.
Research of the influence of changes in ground conditions and operating parameters of the underwater section of the offshore oil pipeline on its possible ascent (Russian)
Zaripov, R. M. (R.R. Mavlyutov Institute of Mechanics, Ufa Federal Scientific Center of the RAS) | Bakhtizin, R. N. (Ufa State Petroleum Technological University) | Masalimov, R. B. (Ufa State Petroleum Technological University)
The article provides brief information on the design features of concreted pipes used in recent years in the construction of offshore pipelines, as well as in the overhaul of main pipelines operated in difficult engineering and geological conditions. The problem is setting of the stress-strain state of an underwater section of an offshore oil pipeline consisting of a blurred bare part and jointly deforming with it adjacent underground parts in which the soil was not subjected to flooding. The following statements of the problem of the stress-strain state of the calculated section of the oil pipeline are considered: 1) taking into account the effect of internal pressure and temperature stresses on the bending of the pipeline, causing additional bending of the gas pipeline; 2) neglecting the effect of internal pressure and temperature stresses on the bending of the concreted pipe. A method for joint numerical integration of differential equations describing the stress-strain state of a blurred exposed part and adjacent underground parts has been developed. Computer calculation programs have been compiled, in which constant integrations have been found, plots of the main characteristics of the stress-strain state along the entire length of the considered section of the oil pipeline have been constructed. Calculations of the main characteristics of the stress-strain state are carried out, diagrams of pipeline deflection and bending stresses are constructed. The tables show the extreme values of deflection and bending stresses from span and support bending moments for various values of operating parameters and soil conditions on adjacent underground parts. The influence on the ascent of the concreted pipe of the length of the blurred bare part, the parameters of operation, the weakening of the rigidity of soils due to their liquefaction in the underground part was revealed. Recommendations are given to identify possible causes of its ascent, as well as a description of the method of returning the pipeline to its design position.
The modern assessment of the economic efficiency of an oil and gas project involves the construction of a specific economic and mathematical calculation model, as well as the analysis of project criteria based on a set of predictive technological indicators for the reservoirs being developed and the field as a whole. The complexity of such modeling lies in the initial collection of information and its constant updating, since each field is individual and has its own geological and technological features of development, various options and standards for capital and operating costs, as well as tax models. Taking into account the latter provision, the intellectual-logical system (ILS) GRAF was developed. The core of the system is the use of a network (graph) form of representation of computational models, as well as a database management system of initial technical and economic indicators for various options for the development of oil and gas fields. The calculation structure is hierarchical and may change depending on the degree of knowledge and exploration of deposits, as well as on the possible change in the volume and content of the initial geological, technological and economic information. The result of an economic assessment based on the use of knowledge bases and data is to identify the most rational option for developing a field that meets the criterion for achieving the maximum economic effect from the possible complete extraction of oil reserves from the reservoirs while observing the requirements of ecology, subsoil and environmental protection. It is relevant that the creation of models of knowledge bases and databases for the economic assessment of the development of oil and gas fields allow storing information on fields in a systematic way and reproducing the history of economic indicators of field development in dynamics for the operation of an applied ILS in order to select the most effective options for the development of various deposits.
Analysis of factors contributing to reduced intake capacity of horizontal injection wells on Vostochno-Messoyakhskoye field and designing remedial actions (Russian)
Ilyasov, I. R. (Messoyakhaneftegas JSC) | Hudz, A. A. (Messoyakhaneftegas JSC) | Podkorytov, A. A. (Messoyakhaneftegas JSC) | Tomashevskiy, M. N. (Messoyakhaneftegas JSC) | Mukhametshin, D. M. (Ufa Scientific and Technical Center LLC) | Ragulin, V. V. (Ufa Scientific and Technical Center LLC) | Gusakov, V. N. (Bashneft-Petrotest LLC) | Mamykin, A. A. (Ufa Scientific and Technical Center LLC) | Telin, A. G. (Ufa Scientific and Technical Center LLC)
The work is devoted to the analysis of the reasons for the decrease in the intake capacity of horizontal injection wells at the Vostochno-Messoyakhskoye oil and gas condensate field, as well as the development of measures to restore it. A complex of experimental studies has been carried out, including the study of mineralogy, granulometry and component composition of sediments; analysis of the possibility of salt deposition of poorly soluble salts; formation of persistent oil-water emulsions; investigation of the solubility of sediments in acid composition and the development of a formulation with low corrosion aggressiveness and increased solvent capacity for sediments. The presence of calcium carbonate, iron compounds and quartz sand in sediments from filter of modular water injection station, as well as in the bottom-hole zone of the injection well formation, has been established. The reasons for the appearance of calcium carbonate in the deposits are the presence of elevated concentrations of calcium and bicarbonate ions in the raw water of the central pumping station, heating of the raw water on the modular water injection station by CCP pumps, insufficient dosage of the salt deposition inhibitor used to protect against calcium carbonate precipitation. Filtration tests were carried out on the rock of the PK1-3 formation and the selection of compositions capable of increasing the permeability of the formation rock. Compositions for acid bath and injection into the reservoir to restore intake capacity have been developed, and their pilot testing has been carried out. Acid compositions have been developed that effectively dissolve deposits from the modular water injection station and bottom-hole formation zone of horizontal injection wells of the Vostochno-Messoyakhskoye field. A complex technology of hydrochloric acid treatments of the bottom-hole formation zone with the establishment of an acid bath and the injection of an acid composition into the reservoir with a pre-treatment of a mutual solvent is proposed. Field testing of selected compositions for processing of the bottom-hole zone of injection wells was carried out, as a result of which an increase in the well intake capacity coefficient was achieved by 2.05 – 2.61 times.
The textural characteristics of the anomalous gravitational and magnetic fields of the Pre-Caspian syneclise are studied using the WinLESSA software package. The results are compared with the lineament network deciphered from space images in the visible and infrared zones of the spectrum. It has been established that the WinLESSA software is applicable for revealing textural features of geophysical fields. It has been established that changes in the texture of geophysical fields have distinct patterns. The anisotropy of the magnetic field is oriented in the northwest direction. The texture of the gravitational field has sublatitudinal, northeastern and northwestern directions. Lineament bundles identified by anomalous fields have a quasi-periodic character and planetary orientation (rays of orthogonal and two diagonal directions), which indicates their connection with planetary stress systems. The largest lineaments are reproduced on all materials, but their density (abundance) depends on the settings adopted and the details of the original image. The textural characteristics of the anomalous gravitational and magnetic fields of the Pre-Caspian syneclise and the results of lineament interpretation are compared with the results of known fault maps. In the north of the Pre-Caspian syneclise, additional blocks have been identified by other methods according to magnetic survey data. Conclusions are presented about the main characteristics of lineaments identified from satellite images, maps of magnetic and gravitational anomalies. The lineaments are generally comparable, with regard to clusters of rose diagrams, and elongation vectors, for which it is impossible to either find correspondences in the previously identified faults, or identify any patterns a chaotic distribution was revealed, the maxima and minima are also randomly and irregularly located on the density map strokes.The textural characteristics of the anomalous gravitational and magnetic fields of the Pre-Caspian syneclise are studied using the WinLESSA software package. The results are compared with the lineament network deciphered from space images in the visible and infrared zones of the spectrum. It has been established that the WinLESSA software is applicable for revealing textural features of geophysical fields. It has been established that changes in the texture of geophysical fields have distinct patterns. The anisotropy of the magnetic field is oriented in the northwest direction. The texture of the gravitational field has sublatitudinal, northeastern and northwestern directions. Lineament bundles identified by anomalous fields have a quasi-periodic character and planetary orientation (rays of orthogonal and two diagonal directions), which indicates their connection with planetary stress systems. The largest lineaments are reproduced on all materials, but their density (abundance) depends on the settings adopted and the details of the original image. The textural characteristics of the anomalous gravitational and magnetic fields of the Pre-Caspian syneclise and the results of lineament interpretation are compared with the results of known fault maps. In the north of the Pre-Caspian syneclise, additional blocks have been identified by other methods according to magnetic survey data. Conclusions are presented about the main characteristics of lineaments identified from satellite images, maps of magnetic and gravitational anomalies. The lineaments are generally comparable, with regard to clusters of rose diagrams, and elongation vectors, for which it is impossible to either find correspondences in the previously identified faults, or identify any patterns a chaotic distribution was revealed, the maxima and minima are also randomly and irregularly located on the density map strokes.
The Pre-Caspian basin has a high oil and gas potential. The sedimentary cover is divided into three complexes – suprasalt, salt and subsalt. The most studied to date is the suprasalt complex. It has the largest number of industrial hydrocarbon accumulations. The Pre-Caspian basin has been studied unevenly in area and in section. The central part is the least studied because of the thick sedimentary cover, which reaches more than 20 km. However, there are positive prerequisites for the discovery of new oil and gas fields in the subsalt complex. Basin modeling and modeling of hydrocarbon systems are used nowadays to establish oil and gas potential. When using these methods, maps of the distribution of total organic content (TOC), hydrogen index (HI) and kerogen type over the studied region are the basis for determining the foci of hydrocarbon generation and a necessary element of any basin model. For their construction, the generation characteristics of the oil-producing strata are needed. For these purposes, the authors additionally investigated the core using the Rock-Eval method, selected from wells Embinskaya 9, Kozhasai PGS 1, Vostochny Akzhar 5, Karakulkeldy P 21. But geochemical parameters directly of the well core are always insufficient, they are distributed unevenly over the area and section, which significantly reduces the reliability and detail of the constructions. Thus, the lack of analytical data on rocks in most of the territory does not allow us to single out oil and gas-producing rocks by area, however, according to the analysis of the physico-chemical properties and composition of oil, biomarkers for the fields of the Tengiz-Karaton zone and the South Embinsky uplift, the approximate age of the oil-producing strata is Devon-middle carbon, it gives reason to assume their wide distribution and good generation potential. Based on the analysis of published data and conducted studies, four oil-producing strata were identified as the Middle Devonian, Upper Devonian, Lower Carboniferous and Lower Permian, maps of the distribution of Total organic carbon, hydrogen index and kerogen type were constructed for subsequent modeling of hydrocarbon systems.The Pre-Caspian basin has a high oil and gas potential. The sedimentary cover is divided into three complexes – suprasalt, salt and subsalt. The most studied to date is the suprasalt complex. It has the largest number of industrial hydrocarbon accumulations. The Pre-Caspian basin has been studied unevenly in area and in section. The central part is the least studied because of the thick sedimentary cover, which reaches more than 20 km. However, there are positive prerequisites for the discovery of new oil and gas fields in the subsalt complex. Basin modeling and modeling of hydrocarbon systems are used nowadays to establish oil and gas potential. When using these methods, maps of the distribution of total organic content (TOC), hydrogen index (HI) and kerogen type over the studied region are the basis for determining the foci of hydrocarbon generation and a necessary element of any basin model. For their construction, the generation characteristics of the oil-producing strata are needed. For these purposes, the authors additionally investigated the core using the Rock-Eval method, selected from wells Embinskaya 9, Kozhasai PGS 1, Vostochny Akzhar 5, Karakulkeldy P 21. But geochemical parameters directly of the well core are always insufficient, they are distributed unevenly over the area and section, which significantly reduces the reliability and detail of the constructions. Thus, the lack of analytical data on rocks in most of the territory does not allow us to single out oil and gas-producing rocks by area, however, according to the analysis of the physico-chemical properties and composition of oil, biomarkers for the fields of the Tengiz-Karaton zone and the South Embinsky uplift, the approximate age of the oil-producing strata is Devon-middle carbon, it gives reason to assume their wide distribution and good generation potential. Based on the analysis of published data and conducted studies, four oil-producing strata were identified as the Middle Devonian, Upper Devonian, Lower Carboniferous and Lower Permian, maps of the distribution of Total organic carbon, hydrogen index and kerogen type were constructed for subsequent modeling of hydrocarbon systems.
- Phanerozoic > Paleozoic > Devonian > Upper Devonian (0.54)
- Phanerozoic > Paleozoic > Permian > Cisuralian (0.44)
- Phanerozoic > Paleozoic > Devonian > Middle Devonian (0.44)
- Phanerozoic > Paleozoic > Carboniferous > Mississippian (0.44)
- Asia > Kazakhstan > Caspian Depression > Caspian Basin (0.99)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.98)
- North America > United States > Texas > Permian Basin > Yates Formation (0.98)
- (22 more...)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Fluid Characterization > Geochemical characterization (1.00)
- Health, Safety, Environment & Sustainability > Sustainability/Social Responsibility > Sustainable development (1.00)
- Health, Safety, Environment & Sustainability > Environment > Climate change (1.00)
Experimental confirmation of the performance of high-viscosity oil extraction method (Russian)
Morozyuk, O. A. (Tyumen Petroleum Research Center LLC) | Kochetov, A. V. (Tyumen Petroleum Research Center LLC) | Zagorovsky, A. A. (Tyumen Petroleum Research Center LLC) | Cherepanova, N. A. (Tyumen Petroleum Research Center LLC) | Blinova, T. S. (Tyumen Petroleum Research Center LLC) | Isaeva, M. I. (Tyumen Petroleum Research Center LLC) | Novosadova, I. V. (Tyumen Petroleum Research Center LLC) | Shulga, R. S. (Tyumen Petroleum Research Center LLC) | Serkin, M. F. (Tyumen Petroleum Research Center LLC)
The enhanced development of high-viscosity oil reserves is very topical issue. One of the most important problems is selecting effective technologies and optimal strategy of high-viscosity oil recovery. The selection of the most effective technologies requires full-scale research, an integral part of which is laboratory testing. The article describes the results of core flow studies to study the high-viscosity oil displacement efficiency by various agents. The research target was the productive high-viscosity oil reservoir of an oil-gas-condensate field in Western Siberia. Experimental screening of potential technologies based on thermal, chemical, and thermochemical methods has been performed under various reservoir conditions of the studied target. As displacement agents we used non-heated water, hot water, polyacrylamide solution, surfactant solution, and alkaline solution. The experiments were carried out on a specialized laboratory stand using the core material and reservoir fluids from the studied reservoir. In total, 18 flow experiments were carried out and 6 technologies were tested. According to the research results, it was found that for the studied reservoir injection of hot water and injection of hot water in combination with a polymer slug (thermo-polymer flooding) are the most effective recovery methods. These methods will be considered as priorities for further pre-design study and pilot tests. Also, based on the research results, proposals were formed for additional laboratory studies (including the selection of a polymer) as part of further substantiation of effective technology for high-viscosity oil production.
- Europe > Russia > Northwestern Federal District > Komi Republic > Timan-Pechora Basin > Izhma-Pechora Basin > Yaregskoye Field (0.99)
- Europe > Russia > Northwestern Federal District > Komi Republic > Timan-Pechora Basin > Denisovsky License Area > Usinskoye Field (0.99)
- Oceania > Papua New Guinea > Papuan Peninsula > Central Province > National Capital District > Petroleum Retention License 15 > P’nyang Field (0.97)
- (11 more...)
Actual case of oil and gas fields development is well test methods improvement. Such tests are one of the most important sources of data on oil and gas field geological structure and reservoir filtration properties. These data is very important to increase the effectiveness of reservoirs development and mathematic modeling. It is known that most informative and reliable results could be acquired during well test at non-stationary flow regimes – pressure buildup (drawdown) and interference test. Surveillance by these methods requires quite long production shut-in, which leads to production losses. That is why alternative well test approaches appears for non-stationary filtration conditions, that reduces production losses. Three so-kind approaches could be identified. The first one is two regimes method (idealized case with significant limitations). The second one is single well or multi-well deconvolution (in the case of these methods, short shutdowns of wells are typical). The third one is production decrease analysis (the most effective for relatively smooth long-term pressure and rates data). For wells with non-stable rates application of these methods is difficult. The authors consider significantly different approach, which does not depend on pressure and rates changes. In standard case for interpretation of such tests initial reservoir pressure is required actual before production start. Due to often production start at interfered reservoir pressure and first point on pressure stabilization curve does not match to reservoir pressure, correct interpretation is difficult. The authors propose new mathematic model for vertical well producing from homogeneous infinite reservoir. This model makes available identification of conductivity-capacitive properties and reservoir pressure. Testing of model on synthetic and field data identified good results.