scholarly journals Analysis of Petrophysical Studies of Deep Oil and Gas Reservoirs of Onshore and Offshore Fields in Azerbaijan

2020 ◽  
Vol 20 (3) ◽  
pp. 204-213
Author(s):  
Vagif Sh. Gurbanov ◽  
◽  
Latif A. Sultanov ◽  
Nurlana I. Gulueva ◽  
◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Oil Industry ◽  
Gas Reservoirs ◽  
Reservoir Rocks ◽  
Deep Wells ◽  
Long Time ◽  
Enhance Efficiency ◽  
The Cost ◽  
Natural Hydrocarbon

The paper presents results of generalized laboratory studies from an array of petrophysical parameters of reservoir rocks (potential hydrocarbon reservoirs). The study is targeted at well-known horizons of productive strata of the Meso- Cenozoic sedimentary basin. The area under study includes oil and gas onshore and deep offshore fields in Azerbaijan that have been under active continuous developments. The development of these natural hydrocarbon accumulations has over a century-long history, which has shown that the major oil and gas deposits are associated with the South Caspian and Kura depressions subjected to an intensive submersion over the Meso-Cenozoic period. Although many of the fields in these depressions have been exploited for a long time, the commercial potential is high enough, especially in deep-seated areas. Nonetheless, problems associated with extracting oil and gas therefrom are pending final resolutions. Subsoil developments in the region are currently performed at an intensive rate at depths above 4-4.5 km, since most oil and gas deposits have already been explored at shallow and moderate depths (even in hard-to-reach areas). As known in oil industry, the wells with a depth of over 4 km are referred to deep wells, while those with a depth of over 6 km are referred to ultra-deep wells. Moreover, drilling of such wells is associated with serious costrelated challenges. For example, the cost of developing deep and even ultra-deep wells is high enough, ranging from $ 2-3 to $ 9-12 million. This fact emphasizes the need to enhance efficiency of such operations, which requires a highscale geological reasoning of a field’s potential and choice of a good location.

scholarly journals Challenges and their remedies while cementing production casing in high-temperature wells

2019 ◽  
pp. 39-46
Author(s):  
Vasiliy P. Ovchinnikov ◽  
Pavel V. Ovchinnikov ◽  
Alexander V. Melekhov ◽  
Oksana V. Rozhkova
Keyword(s):  
Oil And Gas ◽  
High Strength ◽  
Oil Well ◽  
Hydrocarbon Production ◽  
New Methods ◽  
Oil And Gas Fields ◽  
Deep Wells ◽  
Long Time ◽  
Gas Fields ◽  
Reliable Isolation

The development of the global oil industry is closely related to the exploration of new oil and gas fields through the drilling new deep and ultra-deep wells, as well as the application of modern methods of hydrocarbon production. Usage of new methods of production, increasing the depth of the wells, bottomhole temperatures and pressures sets strict requirements and restrictions for the applied plugging materials. Oil well cements must have a long time of thickening to successfully complete the cementing process, grouting stone must have high strength characteristics, heat-resistant properties at high temperatures and provide reliable isolation of the annulus, also have corrosion resistance, ensure durability of the well lining.

Gassmann's fluid substitution and shear modulus variability in carbonates at laboratory seismic and ultrasonic frequencies

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. F173-F183 ◽  
Author(s):  
Ludmila Adam ◽  
Michael Batzle ◽  
Ivar Brevik
Keyword(s):  
Shear Modulus ◽  
Bulk Modulus ◽  
Oil Recovery ◽  
Laboratory Experiments ◽  
Oil And Gas ◽  
Pressure Effects ◽  
Gas Reservoirs ◽  
Reservoir Rocks ◽  
Fluid Saturation ◽  
Seismic Frequencies

Carbonates have become important targets for rock property research in recent years because they represent many of the major oil and gas reservoirs in the world. Some are undergoing enhanced oil recovery. Most laboratory studies to understand fluid and pressure effects on reservoir rocks have been performed on sandstones, but applying relations developed for sandstones to carbonates is problematic, at best. We measure in the laboratory nine carbonate samples from the same reservoir at seismic (3–3000 Hz) and ultrasonic [Formula: see text] frequencies. Samples are measured dry (humidified) and saturated with liquid butane and brine. Our carbonate samples showed typical changes in moduli as a function of porosity and fluid saturation. However, we explore the applicability of Gassmann’s theory on limestone and dolomite rocks in the context of shear- and bulk-modulus dispersion and Gassmann’s theory assumptions. For our carbonate set at high differential pressures and seismic frequencies, the bulk modulus of rocks with high-aspect-ratio pores and dolomite mineralogy is predicted by Gassmann’s relation. We also explore in detail some of the assumptions of Gassmann’s relation, especially rock-frame sensitivity to fluid saturation. Our carbonate samples show rock shear-modulus change from dry to brine saturation conditions, and we investigate several rock-fluid mechanisms responsible for this change. To our knowledge, these are the first controlled laboratory experiments on carbonates in the seismic frequency range.

scholarly journals Integrated petrophysical study to validate water saturation from well logs in Bahariya Shaley Sand Reservoirs, case study from Abu Gharadig Basin, Egypt

2020 ◽  
Vol 10 (8) ◽  
pp. 3139-3155
Author(s):  
Mohamed El-Bagoury
Keyword(s):  
Clay Minerals ◽  
Oil And Gas ◽  
Water Saturation ◽  
Exchange Capacity ◽  
Fine Tuning ◽  
Well Logs ◽  
Gas Reservoirs ◽  
Reservoir Rocks ◽  
Resistivity Logs ◽  
Petroleum Fields

Abstract Water saturation is a key parameter in evaluating oil and gas reservoirs and calculating OIIP and GIIP for petroleum fields. The late Cretaceous Bahariya reservoir contains variable amounts of clay minerals. Bore hole logs are affected with those clay minerals particularly the density and resistivity logs. Several methods are acknowledged to determine the true water saturation from well logs in shaley sand reservoirs. Each method assumes a sort of corrections to amount of shale distributed in the reservoir. The scope of this petrophysical study is to integrate core analysis and bore hole logs to investigate the characteristics of water saturation in the Bahariya reservoirs. Comparison between most of the significant shaley sand methods is presented in this research. Reservoir lithology and mineralogy are explained by Elan-model while bore hole images are used for fine-tuning the electrofacies. Siltstone, shaley sand and clean sandstones are the main electrofacies that is characterizing the Bahariya reservoir rocks. For accurate saturation results, some core samples have been used for validating the log-derived water saturation. Dean stark and cation exchange capacity experiments are integrated with bore hole logs to calculate the error in water saturation for each method for best calibration. The successful integration between logs and core measurements led to convenient log evaluation and accurate understanding for the Bahariya reservoir in the prospective part of Abu Gharadig basin.

scholarly journals Assessment of the Impact of the Adverse Economic Geopolitical Environment on the Worth of Russian Oil and Gas Companies

2018 ◽  
Vol 8 (2) ◽  
pp. 30-43 ◽  
Author(s):  
V. S. Lipatnikov ◽  
K. A. Kirsanova
Keyword(s):  
Oil And Gas ◽  
Oil Prices ◽  
Oil Industry ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Market Capitalization ◽  
The Cost ◽  
Oil And Gas Companies ◽  
The Impact ◽  
Oil Company

The relevance of the chosen topic is connected to the fact that in the conditions of value-based management, market capitalization acts as a key indicator of the company efficiency. At the present time, when the Russian oil and gas industry has become the object of international sectoral sanctions, the identification of the impact of these sanctions on the domestic oil and gas companies’ value is of great practical importance. The article considers the cost of oil and gas companies and the impact of sectoral sanctions and negative dynamics of oil prices. The study was conducted using econometric modeling tools. For analysis 4 of the oil company with the largest market share, namely PJSC “Rosneft Oil Company”, PJSC “LUKOIL”, JSC “Gazprom Neft” and PJSC “Tatneft”, which in the aggregate represent 62% of the entire Russian oil industry, were selected. The features of valuation of Russian oil and gas companies are covered. The sanctions in the oil and gas industry of the Russian Federation are considered, the consequences of their introduction and the fall of the world oil price are analysed. The analysis to determine the impact of the cost of oil and gas companies from international sanctions and oil prices. It was found that in the oil industry market capitalization depends directly on the price of oil, and in the gas industry this impact is absent. It was discovered that due to the low level of oil prices, the sanctions did not have a significant influence on the cost of oil and gas companies. 

scholarly journals Support Vector Machine Algorithm for Automatically Identifying Depositional Microfacies Using Well Logs

2019 ◽  
Vol 11 (7) ◽  
pp. 1919 ◽  
Author(s):  
Dahai Wang ◽  
Jun Peng ◽  
Qian Yu ◽  
Yuanyuan Chen ◽  
Hanghang Yu
Keyword(s):  
Support Vector Machine ◽  
Oil And Gas ◽  
Field Application ◽  
Well Logs ◽  
Support Vector ◽  
Gas Reservoirs ◽  
Oil And Gas Exploration ◽  
Core Samples ◽  
Svm Algorithm ◽  
The Cost

Depositional microfacies identification plays a key role in the exploration and development of oil and gas reservoirs. Conventionally, depositional microfacies are manually identified by geologists based on the observation of core samples. This conventional method for identifying depositional microfacies is time-consuming, and only the depositional microfacies in a few wells can be identified due to the limited core samples in these wells. In this study, the support vector machine (SVM) algorithm is proposed to identify depositional microfacies automatically using well logs. The application of SVM includes the following steps: First, the depositional microfacies are determined manually in several wells with core samples. Then, the training sets used in the SVM algorithm are extracted from the well logs. Finally, a quantitative discrimination model based on the SVM algorithm is established to realize the classification of depositional microfacies. Field application shows that this innovative and constructive solution can be effectively used in uncored wells to identify depositional microfacies with a rate of accuracy approaching 84%. It overcomes the limitation of the conventional manual method which greatly contributes to the cost-saving of core analysis and improves the sustainable profitability of oil and gas exploration.

scholarly journals MODERN APPROACHES TO DETERMINE THE PERMEABILITY OF RESERVOIR ROCKS BASED ON THE RESULTS OF GEOPHYSICAL INVESTIGATIONS

2018 ◽  
pp. 45-54
Author(s):  
A. Shynkarenko
Keyword(s):  
Oil And Gas ◽  
Complex Structure ◽  
Physical Property ◽  
Space Structure ◽  
Void Space ◽  
Gas Reservoirs ◽  
Reservoir Rocks ◽  
Reservoir Conditions ◽  
Unsteady Fluid

Permeability of rock is its physical property that describes its ability to conduct fluids under the pressure gradient. This paper presents short description and analysis of methods for determination of permeability of oil and gas reservoirs. Permeability is a function of different parameters that leads to difficulties during its estimation. Investigations of the void space structure of rocks, their anisotropy etc.were carried out in order to take into account all factors that have an influence on the permeability. Reservoir conditions could also be modeled for that purpose. Methods for determination of permeability of rocks can be divided into three groups: methods based on the laboratory studies of rocks; methods based on the well logging data; and methods based on the correlations between different parameters of rocks. The first two groups include methods for steady and unsteady fluid flow. Methods for the unsteady flow are usually more precise and rapid, thus prospects of extension of methods for permeability determination are mostly connected with them. Each of the presented methods to determine permeability is characterized by some pros and cons. The most appropriate method for the specific experiment is always chosen according to conditions and requirements and expected results. Further author's investigations will be related to the creation of petrophysical models of permeability of oil and gas reservoir rocks, including reservoirs of complex structure.

scholarly journals Acoustic Logging Methods in Fractured and Porous Formations

2020 ◽  
Author(s):  
Sudad H Al-Obaidi ◽  
Khalaf FH
Keyword(s):  
Oil And Gas ◽  
Sound Waves ◽  
Porous Rocks ◽  
Gas Reservoirs ◽  
Transverse Waves ◽  
Reservoir Rocks ◽  
Sonic Log ◽  
Attenuation Rate ◽  
Path Direction ◽  
Wave Path

Formation fractures have significance effect on the permeability of rocks in oil and gas reservoirs. In real conditions, the opening of vertical fractures exceeds the opening of horizontal fractures and the permeability ofreservoirs in conditions of horizontal wells is higher than in vertical conditions. In the sonic log longitudinal waves, unlike the transverse waves, the attenuation rate strongly depends on the wave path direction. It is shown that themechanism of the attenuation of sound waves in porous rocks is represented by the scattering of "soft" microheterogeneousinclusions. For reservoir rocks with porosity (φ) of (10-20)%, the attenuation decrement is several times higher than the decrement of the other mechanisms.

Tax maneuver in the oil industry: Provisional results and risks for further implementation

2020 ◽  
pp. 28-43
Author(s):  
A. S. Kaukin ◽  
E. М. Miller
Keyword(s):  
Oil Industry ◽  
Oil Products ◽  
Oil Refining ◽  
State Budget ◽  
Tax Rate ◽  
Oil Companies ◽  
Reform Plan ◽  
Alternative Variant ◽  
Calculation Results ◽  
The Cost

The paper analyzes the consequences of the abolition of the export duty on oil and oil products as a necessary step to stimulate energy efficiency of Russia’s economy and eliminate underdevelopment provoked by a long-term subsidizing of inefficient oil refining sector in Russia. The calculation results have shown that even taking into account several deviations from the planned scenarios of changing the parameters of tax regulation of the oil industry in 2014— 2019, the tax maneuver brought over 3.5 trillion rubles (in 2019 — 148 billion rubles) to the state budget in 2014—2017, mainly due to an increase in the base mineral extraction tax rate, and contributed to an increase in the depth of oil refining from 72% to 85%. In addition, the article analyzes possible risks associated with the current plan for reforming the taxation of the industry until 2024 and proposes an alternative that could level some of them. A comparative analysis of the effects of the tax maneuver under the current reform plan and the alternative variant suggests that the latter will allow to achieve a greater total budgetary effect in four years, reduce the cost of subsidizing domestic oil refining, increase the efficiency of Russian vertically integrated oil companies, and reduce the growth rate of oil products prices in the retail market.

Main approaches to estimating the cost of shareholder equity of oil and gas producers

2020 ◽  
Vol 26 (3) ◽  
pp. 685-697
Author(s):  
O.V. Shimko
Keyword(s):  
Oil And Gas ◽  
Oil Prices ◽  
Minimum Cost ◽  
Free Cash Flow ◽  
Annual Reports ◽  
Comparative Approach ◽  
Economic Activities ◽  
Advantages And Disadvantages ◽  
Oil And Gas Producers ◽  
The Cost

Subject. The study analyzes generally accepted approaches to assessing the value of companies on the basis of financial statement data of ExxonMobil, Chevron, ConocoPhillips, Occidental Petroleum, Devon Energy, Anadarko Petroleum, EOG Resources, Apache, Marathon Oil, Imperial Oil, Suncor Energy, Husky Energy, Canadian Natural Resources, Royal Dutch Shell, Gazprom, Rosneft, LUKOIL, and others, for 1999—2018. Objectives. The aim is to determine the specifics of using the methods of cost, DFC, and comparative approaches to assessing the value of share capital of oil and gas companies. Methods. The study employs methods of statistical analysis and generalization of materials of scientific articles and official annual reports on the results of financial and economic activities of the largest public oil and gas corporations. Results. Based on the results of a comprehensive analysis, I identified advantages and disadvantages of standard approaches to assessing the value of oil and gas producers. Conclusions. The paper describes pros and cons of the said approaches. For instance, the cost approach is acceptable for assessing the minimum cost of small companies in the industry. The DFC-based approach complicates the reliability of medium-term forecasts for oil prices due to fluctuations in oil prices inherent in the industry, on which the net profit and free cash flow of companies depend to a large extent. The comparative approach enables to quickly determine the range of possible value of the corporation based on transactions data and current market situation.

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