Peculiarities of the Geological Structure of the Roslavl License Block

2018 ◽  
Vol 785 ◽  
pp. 171-177
Author(s):  
Vadim Aleksandrov ◽  
Marsel Kadyrov ◽  
Alexander Markov ◽  
Vadim Golozubenko ◽  
Yuriy Sivkov
Keyword(s):  
Data Analysis ◽  
Oil Recovery ◽  
Middle Jurassic ◽  
Oil And Gas ◽  
West Siberia ◽  
Geological Structure ◽  
Oil Reservoirs ◽  
Geological Exploration ◽  
Hydrocarbon Saturation

The Roslavl license block is one of the main assets of "RussNeft" company. Some particular perspectives of enhancing oil recovery are connected with this territory. The work objective was to define the perspectives of geological exploration, find new hydrocarbon deformational traps, and specify the geological structure of the already-known oil reservoirs in the Neocomian sediments, the Achimov strata, and Middle Jurassic sediments. The data analysis is necessary to create a new promising exploitation drilling program. The Roslavl license block is considered to be one of the most difficult and interesting areas in the sphere of hydrocarbon saturation perspectives from the quantitative aspects viewpoint. Different expectations on enhancing oil recovery in the Middle Ob oil and gas province of West Siberia are connected with this license block. Therefore, these perspectives were evaluated with the help of deep analysis of shooting data collected by seismic crews in different years, and the results of drilling. Different archival geological and geophysical evidence was analyzed to offer recommendations on the following geological exploration.

scholarly journals Methodological approaches to increasing the flooding system efficiency at the later stage of reservoir development

2021 ◽  
pp. 161-171
Author(s):  
V. A. Grishchenko ◽  
◽  
I. M. Tsiklis ◽  
V. Sh. Mukhametshin ◽  
R. F. Yakupov ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Geological Structure ◽  
Oil Fields ◽  
Lower Carboniferous ◽  
Field Development ◽  
Reservoir Development ◽  
Recovery Techniques ◽  
Efficiency Cost ◽  
Methodological Approaches

Based on the analysis of the efficiency of CVI.1 and CVI.2 oil reservoirs development, which partially coincide in structural terms, and the terrigenous strata of the Lower Carboniferous of one of Volga-Ural oil and gas province oil fields, an algorithm for assessing the efficiency of waterflooding was proposed, which takes into account the geological structure of the facility, the results of core and geophysical well surveys, as well as the historical performance of wells. The presented algorithm makes it possible to identify ineffective injection directions for making decisions on waterflooding system optimizing. The effect is the identified potential to cut costs by reducing inefficient injection, as well as identifying areas for the introduction of enhanced oil recovery techniques. Keywords: field development; reservoir pressure maintenance system; waterflooding efficiency; cost reduction.

scholarly journals GIS PROJECT AS AN UNIFIED SPACE FOR WORKING WITH GEOLOGICAL AND GEOPHYSICAL DATA

2021 ◽  
Vol 3 (2) ◽  
pp. 259-266
Author(s):  
Dmitriy S. Loginov
Keyword(s):  
Oil And Gas ◽  
Single Point ◽  
Geological Structure ◽  
Geophysical Data ◽  
Geological Exploration ◽  
Area Of Interest ◽  
Frequency Changes ◽  
Other World ◽  
Information Frequency

The article described the role of GIS projects when working with geological and geophysical data in the production process of oil and gas enterprises. The sequence of the formation of GIS project content in the process of geological exploration is highlighted. Practical examples of using of accumulated geodata are given. They used for assessing the quality of initial geophysical data, for studying the geological structure of the area of interest, for preparing cartographic materials of various degrees of significance. The approbation was carried out within the cartographic support for geological exploration works at sites in various regions of the Russian Federation and other world countries. The universality of GIS projects using has been determined: as a tool for working with geodata, an instrument for creating cartographic products, a single point of access to the accumulated information, a data warehouse. The general patterns of consumers' requests for digital cartographic information frequency changes during the main stages of geophysical work have been identified.

scholarly journals CO2 Injection and Enhanced Oil Recovery in Ohio Oil Reservoirs—An Experimental Approach to Process Understanding

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6215
Author(s):  
Manoj Kumar Valluri ◽  
Jimin Zhou ◽  
Srikanta Mishra ◽  
Kishore Mohanty
Keyword(s):  
Oil Recovery ◽  
Power Plants ◽  
Oil And Gas ◽  
Oil Reservoirs ◽  
Reservoir Rock ◽  
Co2 Injection ◽  
Reservoir Properties ◽  
Industrial Facilities ◽  
Water Alternating Gas ◽  
Process Understanding

Process understanding of CO2 injection into a reservoir is a crucial step for planning a CO2 injection operation. CO2 injection was investigated for Ohio oil reservoirs which have access to abundant CO2 from local coal-fired power plants and industrial facilities. In a first of its kind study in Ohio, lab-scale core characterization and flooding experiments were conducted on two of Ohio’s most prolific oil and gas reservoirs—the Copper Ridge dolomite and Clinton sandstone. Reservoir properties such as porosity, permeability, capillary pressure, and oil–water relative permeability were measured prior to injecting CO2 under and above the minimum miscibility pressure (MMP) of the reservoir. These evaluations generated reservoir rock-fluid data that are essential for building reservoir models in addition to providing insights on injection below and above the MMP. Results suggested that the two Ohio reservoirs responded positively to CO2 injection and recovered additional oil. Copper Ridge reservoir’s incremental recovery ranged between 20% and 50% oil originally in place while that of Clinton sandstone ranged between 33% and 36% oil originally in place. It was also deduced that water-alternating-gas injection schemes can be detrimental to production from tight reservoirs such as the Clinton sandstone.

FEATURES OF GEOLOGICAL STUDY AND DEVELOPMENT OF ACCUMULATIONS WITH HARD-TO-RECOVER RESERVES IN THE PRE-JURASSIC PLAY OF WEST SIBERIA IN RELATION TO THE EXPERIENCE OF GEOLOGICAL-ECONOMIC APPRAISAL

2021 ◽  
pp. 94-105
Keyword(s):  
Oil And Gas ◽  
West Siberia ◽  
Geological Structure ◽  
Raw Material ◽  
Material Base ◽  
Technological Parameters ◽  
The West ◽  
Petroleum Potential ◽  
Economic Appraisal ◽  
Exploration And Development

Within the West Siberian petroleum basin, more than 60 oil and gas fields have been discovered in the pre-Jurassic basement formations. Reserves of these fields are referred to hard-to-recover ones due to both the complexity of the geological structure and the need to apply non-standard approaches at all stages of their search, exploration and development. Development of the Pre-Jurassic complex is one of the main directions in replenishing the raw material base of hydrocarbons in West Siberia, where production from traditional fields is steadily declining. The article summarizes the data on geological features and petroleum potential of the Pre-Jurassic complex of the West Siberian basin. Based on the analysis of results of exploration and development of accumulations, proposals on various geological and technological parameters are formulated when performing the geological and economic appraisal of promising targets with similar predicted characteristics.

Geological and Field Feasibility Study of Field Development Management Using Marker-Based Production Profiling Surveillance in Horizontal Wells: The Case Study of the Yuzhno-Vyintoiskoye Field

2021 ◽  
Author(s):  
Marat Rafailevich Dulkarnaev ◽  
Yuri Alexeyevich Kotenev ◽  
Shamil Khanifovich Sultanov ◽  
Alexander Viacheslavovich Chibisov ◽  
Daria Yurievna Chudinova ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Water Saturation ◽  
Clay Content ◽  
Horizontal Wells ◽  
Integrated Approach ◽  
Geological Structure ◽  
Gas Field ◽  
Field Development ◽  
Reservoir Rocks

In pursuit of efficient oil and gas field development, including hard-to-recover reserves, the key objective is to develop and provide the rationale for oil recovery improvement recommendations. This paper presents the results of the use of the workflow process for optimized field development at two field clusters of the Yuzhno-Vyintoiskoye field using geological and reservoir modelling and dynamic marker-based flow production surveillance in producing horizontal wells. The target reservoir of the Yuzhno-Vyntoiskoye deposit is represented by a series of wedge-shaped Neocomian sandstones. Sand bodies typically have a complex geological structure, lateral continuity and a complex distribution of reservoir rocks. Reservoir beds are characterised by low thickness and permeability. The pay zone of the section is a highly heterogeneous formation, which is manifested through vertical variability of the lithological type of reservoir rocks, lithological substitutions, and the high clay content of reservoirs. The target reservoir of the Yuzhno-Vyintoiskoye field is marked by an extensive water-oil zone with highly variable water saturation. According to paleogeographic data, the reservoir was formed in shallow marine settings. Sand deposits are represented by regressive cyclites that are typical for the progressing coastal shallow water (Dulkarnaev et al., 2020). Currently, the reservoir is in production increase cycle. That is why an integrated approach is used in this work to provide a further rationale and creation of the starting points of the reservoir pressure maintenance system impact at new drilling fields to improve oil recovery and secure sustainable oil production and the reserve development rate under high uncertainty.

scholarly journals Analysis of Caprock Tightness for CO2 Enhanced Oil Recovery and Sequestration: Case Study of a Depleted Oil and Gas Reservoir in Dolomite, Poland

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3065
Author(s):  
Małgorzata Słota-Valim ◽  
Andrzej Gołąbek ◽  
Wiesław Szott ◽  
Krzysztof Sowiżdżał
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Co2 Sequestration ◽  
Oil And Gas ◽  
Geological Structure ◽  
Potential Candidate ◽  
Threshold Pressure ◽  
Co2 Leakage ◽  
Coupling Procedure ◽  
Key Factor

This study addresses the problem of geological structure tightness for the purposes of enhanced oil recovery with CO2 sequestration. For the first time in the history of Polish geological survey the advanced methods, practical assumptions, and quantitative results of detailed simulations were applied to study the geological structure of a domestic oil reservoir as a potential candidate for a combined enhanced oil recovery and CO2 sequestration project. An analysis of the structure sequestration capacity and its tightness was performed using numerical methods that combined geomechanical and reservoir fluid flow modelling with a standard two-way coupling procedure. By applying the correlation between the geomechanical state and transport properties of the caprock, threshold pressure variations were determined to be a key factor affecting the sealing properties of the reservoir–caprock boundary. In addition to the estimation of the sequestration capacity of the structure, the process of CO2 leakage from the reservoir to the caprock was simulated for scenarios exceeding the threshold pressure limit of the reservoir–caprock boundary. The long-term simulations resulted in a comprehensive assessment of the total amount of CO2 leakage as a function of time and the leaked CO2 distribution within the caprock.

scholarly journals Mechanism of Permeability and Oil Recovery during Fracturing in Tight Oil Reservoirs

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 972
Author(s):  
Yujie Bai ◽  
Guangsheng Cao ◽  
Guanglei Wei ◽  
Xiaohan Nan ◽  
Qingchao Cheng ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Crude Oil ◽  
Oil Recovery ◽  
Oil And Gas ◽  
Oil Reservoirs ◽  
Dynamics Simulation ◽  
Tight Oil ◽  
Fracturing Fluid ◽  
Flow Through ◽  
Tight Oil Reservoirs

In this study, the effect of fracturing fluid on the permeability of tight oil reservoirs is analyzed through oil absorption. The mechanism of permeation and absorption in tight oil reservoirs was studied using the molecular dynamics simulation of fluid flow through fractures in porous media containing crude oil. The influence of surfactants on the adsorption characteristics of crude oil formations on rock walls was also examined. The research results show that the introduction of the appropriate surfactant to the fracturing fluid could accelerate the rate of percolation and recovery as well as improve the recovery rate of absorption. The optimal concentration of polyoxyethylene octyl phenol ether-10 (OP-10) surfactant in the fracturing fluid was 0.9%. When the percolation reached a certain stage, the capillary forces in the crude oil and percolation medium in the pore stabilized; accordingly, the crude oil from the pore roar should be discharged at the earliest. The fluid flow through the fracture effectively carries the oil seeping out near the fractured wall to avoid the stability of the seepage and absorption systems. The surfactant can change the rock absorbability for crude oil, the result of which is that the percolating liquid can adsorb on the rock wall, thus improving the discharge of crude oil. The results of this study are anticipated to significantly contribute to the advancement of oil and gas recovery from tight oil reservoirs.

Modeling Study on Reviving Abandoned Oil Reservoirs by In Situ Combustion Without CO2 Production While Recovering Both Oil and Heat

2021 ◽  
Vol 143 (8) ◽  
Author(s):  
Yun Han ◽  
Kewen Li ◽  
Lin Jia
Keyword(s):  
Numerical Simulation ◽  
Oil Recovery ◽  
Oil And Gas ◽  
Numerical Models ◽  
Oil Reservoirs ◽  
Co2 Production ◽  
Geothermal System ◽  
Residual Oil ◽  
Gas Reservoirs ◽  
Oil And Gas Reservoirs

Abstract A large number of oil wells have been or will be abandoned around the world. Yet, a very large amount of oil and energy is left behind inside the rocks in abandoned reservoirs because of technological and economic limitations. The residual oil saturation is usually more than 40%, and in shale reservoirs it can be more than 90%. There have been many enhanced oil recovery methods developed to tap the residual oil and improve the oil recovery. Interestingly, a concept has been proposed to transfer abandoned oil and gas reservoirs into exceptional enhanced geothermal reservoirs by oxidizing the residual oil with injected air (Li and Zhang, 2008, “Exceptional Enhanced Geothermal Systems From Oil and Gas Reservoirs,” 43rd Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA). This methodology was referred to as an exceptional enhanced geothermal system (EEGS). However, zero CO2 production has not been achieved during the process of EEGS. To this end, numerical models of EEGS in abandoned oil reservoirs configured with vertical wells were established in the present study. Numerical simulations in different well configurations were conducted. The effects of well distance, perforation position, and formation permeability on the CO2 production and the reservoir temperature have been investigated. The numerical simulation results showed that when the depth difference between the production and the injection well perforation positions reaches a specific value, the daily CO2 production rate could be kept at almost zero for over 50 years or even permanently while producing oil and thermal energy continuously. This implies that we realized the concept of EEGS with no CO2 successfully using numerical simulation.

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