scholarly journals Forecast of the position of promising sand reservoirs in the cross-section of the carboniferous gas-bearing stratum

2019 ◽  
Vol 109 ◽  
pp. 00051
Author(s):  
Viacheslav Lukinov ◽  
Mykola Zhykaliak
Keyword(s):  
Cross Section ◽  
Oil And Gas ◽  
Rapid Assessment ◽  
Gas Condensate ◽  
Gas Oil ◽  
Solid Mass ◽  
Coal Deposits ◽  
Overburden Stress ◽  
The Cross ◽  
Gas Bearing

The results of the study of the influence of overburden stress in a solid mass undisturbed by mine workings on the compaction of sandstones within mine fields, exploration areas of Donbas coal deposits and some gas condensate and oil and gas condensate deposits of the Dnipro-Donets Depression (DDD) are presented. Regularities of changes in gas-bearing properties of porous reservoirs with the increase of overburden stress in an undisturbed solid mass, or its decrease in mine conditions are considered. The possibilities of rapid assessment of the forecast position of prospective sand reservoirs in the cross-section of the gas-bearing stratum are shown. Methods are proposed for calculating the position of sandstones of gas-bearing stratum, in which it is advisable to search for gas accumulations and its extraction in the coal and gas, oil and gas condensate and gas condensate fields of Donbas and DDD.

Variations of Gas/Condensate Relative Permeability With Production Rate at Near-Wellbore Conditions: A General Correlation

2006 ◽  
Vol 9 (06) ◽  
pp. 688-697 ◽  
Author(s):  
Mahmoud Jamiolahmady ◽  
Ali Danesh ◽  
D.H. Tehrani ◽  
Mehran Sohrabi
Keyword(s):  
Relative Permeability ◽  
Oil And Gas ◽  
Coupling Effect ◽  
Flow Behavior ◽  
Accurate Determination ◽  
Gas Condensate ◽  
Gas Oil ◽  
Fractional Flow ◽  
General Correlation ◽  
Fluid Saturation

Summary It has been demonstrated, first by this laboratory and subsequently by other researchers, that the gas and condensate relative permeability can increase significantly by increasing rate, contrary to the common understanding. There are now a number of correlations in the literature and commercial reservoir simulators accounting for the positive effect of coupling and the negative effect of inertia at near-wellbore conditions. The available functional forms estimate the two effects separately and include a number of parameters, which should be determined with measurements at high-velocity conditions. Measurements of gas/condensate relative permeability at simulated near-wellbore conditions are very demanding and expensive. Recent experimental findings in this laboratory indicate that measured gas/condensate relative permeability values on cores with different characteristics become more similar if expressed in terms of fractional flow instead of the commonly used saturation. This would lower the number of rock curves required in reservoir studies. Hence, we have used a large data bank of gas/condensate relative permeability measurements to develop a general correlation accounting for the combined effect of coupling and inertia as a function of fractional flow. The parameters of the new correlation are either universal, applicable to all types of rocks, or can be determined from commonly measured petrophysical data. The developed correlation has been evaluated by comparing its prediction with the gas/condensate relative permeability values measured at near-wellbore conditions on reservoir rocks not used in its development. The results are quite satisfactory, confirming that the correlation can provide reliable information on variations of relative permeability at near-wellbore conditions with no requirement for expensive measurements. Introduction The process of condensation around the wellbore in a gas/condensate reservoir, when the pressure falls below the dewpoint, creates a region in which both gas and condensate phases flow. The flow behavior in this region is controlled by the viscous, capillary, and inertial forces. This, along with the presence of condensate in all the pores, dictates a flow mechanism that is different from that of gas/oil and gas/condensate in the bulk of the reservoir (Danesh et al. 1989). Accurate determination of gas/condensate relative permeability (kr) values, which is very important in well-deliverability estimates, is a major challenge and requires an approach different from that for conventional gas/oil systems. It has been widely accepted that relative permeability (kr) values at low values of interfacial tension (IFT) are strong functions of IFT as well as fluid saturation (Bardon and Longeron 1980; Asar and Handy 1988; Haniff and Ali 1990; Munkerud 1995). Danesh et al. (1994) were first to report the improvement of the relative permeability of condensing systems owing to an increase in velocity as well as that caused by a reduction in IFT. This flow behavior, referred to as the positive coupling effect, was subsequently confirmed experimentally by other investigators (Henderson et al. 1995, 1996; Ali et al. 1997; Blom et al. 1997). Jamiolahmady et al. (2000) were first to study the positive coupling effect mechanistically capturing the competition of viscous and capillary forces at the pore level, where there is simultaneous flow of the two phases with intermittent opening and closure of the gas passage by condensate. Jamiolahmady et al. (2003) developed a steady-dynamic network model capturing this flow behavior and predicted some kr values, which were quantitatively comparable with the experimentally measured values.

scholarly journals Development of effective fiber-reinforced concrete compositions used in transportation structures

2021 ◽  
Vol 2 (1 (110)) ◽  
pp. 6-11
Author(s):  
Nizami Ahmadov ◽  
Irade Shirinzade
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Oil And Gas ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Operational Parameters ◽  
Deformation Properties ◽  
The Cross ◽  
Effective Reinforcement ◽  
Concrete Matrix

The possibility of producing fiber-reinforced concrete with high deformation properties by regulating the microstructure and using it in the design of transport structures was considered. It was found that to create high-performance transport structures, it is necessary to modify fiber mixtures with complex additives, i. e. increase the strength of fiber-reinforced concrete at the micro-level. To obtain a denser structure of the concrete matrix, complex additives were used – ultrafine additive (silica fume) and Master Air 200 B air-entraining additive. It was experimentally proved that using such additives reduces the water-cement ratio and further strengthens the concrete matrix structure. The design of the unloading structure on the railway line constructed from the Karadag station (Republic of Azerbaijan) to the SOCAR oil and gas processing and petrochemical complex using fiber-reinforced concrete modified with complex additives was made. The results of designing the fiber-reinforced concrete unloading structure were analyzed and the results of designing the fiber-reinforced concrete unloading structure and the regular concrete unloading structure were compared. As a result of the comparison, it was found that using fiber-reinforced concrete decreases the cross-section diameter of the effective reinforcement of the slab – the cross-section diameter of the effective reinforcement of the pavement slab decreases from Æ2×32 mm to Æ32 mm in the upper and Æ25 mm in the lower row, respectively. Crack resistance is also increased compared to regular concrete. Thus, in order to create structures with high transport and operational parameters, it is necessary to modify fiber-reinforced concrete mixtures with complex additives

scholarly journals About Relations between Natural Gas and Oil in Connection with Forecast of Their Reserves in Azerbaijan

2021 ◽  
Vol 5 (4) ◽  
pp. 288-296
Author(s):  
A. A. Feizullaev
Keyword(s):  
Natural Gas ◽  
Oil And Gas ◽  
Gas Condensate ◽  
The Other ◽  
Gas Oil ◽  
Oil Reserves ◽  
Ratio Data ◽  
The World ◽  
Deepwater Part ◽  
Deep Water Part

Azerbaijan is one of the oldest oil and gas provinces, where more than 2 bln tons of oil have been extracted over more than a century. At present, the oil production is declining and mainly determined by production from the Azeri-Chirag-Guneshli offshore block (AChG). Compared to oil, the opportunities for further growing natural gas reserves and production are very promising. For the latest years, a number of large gas condensate fields have been discovered in the deep-water part of South Caspian Sea, such as Shakh-Deniz, Apsheron, Umid. There are a number of prospects that have not yet been drilled in this part of the sea basin. The paper assesses their prospectivity, substantiates the priority exploration targets and, on the basis of the statistical analysis of the quantitative gas/oil ratio data for many other Azerbaijanian and world basins, an attempt is made to assess the reserves in the prospects. The total recoverable oil reserves in Azerbaijan are estimated at 3.5 bln tons, of which slightly above 2 bln tons have already been extracted. Based on the statistically estimated ratio between the volumes of gas and oil in various basins of the world, including Azerbaijan, the total possible natural gas reserves in Azerbaijan are estimated at about 4 trillion m3 . This is in agreement with the other available estimates. Of this volume of natural gas, 0.85 trillion m3 has already been extracted, and the approved geological reserves are estimated at 2.55 trillion m3 . Almost 83% of the extracted natural gas belonged to offshore fields. This trend will continue in the future, and, moreover, will be strengthened due to large volumes of gas condensate accumulations in the deepwater part of the basin. In this part of the basin, the most attractive prospects are Mashal, Shafag, and Israfil Huseynov, total reserves of which are expected at 0.6 trillion m3 of natural gas.

scholarly journals Tectonophysical approach to the analysis of geological and geophysical data on gas-condensate deposits with the complex platform cover

2018 ◽  
Vol 9 (3) ◽  
pp. 587-627 ◽  
Author(s):  
K. Zh. Seminsky ◽  
V. A. Sankov ◽  
V. V. Ogibenin ◽  
Yu. P. Burzunova ◽  
A. I. Miroshnichenko ◽  
...  
Keyword(s):  
Cross Section ◽  
Block Structure ◽  
Active Material ◽  
Fault Zones ◽  
Gas Condensate ◽  
Seismic Survey ◽  
Stress Fields ◽  
Crustal Stresses ◽  
The Cross ◽  
Platform Cover

The article presents the results of the tectonophysical approach to the analysis of stress fields and the structure of gas–condensate deposits with the complex platform cover. The discussed case is the Kovykta license area (LA) in Eastern Siberia, Russia. In the upper part of the cross section, the network of fault zones was identified from the relief lineaments and structural data. The dynamic conditions for faulting (compression, extension, and strike-slip) were reconstructed by the paragenetic analysis. The state of crustal stresses in the study area was studied by tectonophysical modeling using gelatin as an optically active material. The applied method was successful in distinguishing between the zones of faults in the platform cover, which differ in the degree of their activity in the specified stress fields. The lower part of the cross section in the NE segment of the Kovykta LA is considered as an example of the tectonophysical interpretation of the electrical and seismic survey data in order to identify the fault zones and reconstruct the corresponding stress fields. Based on the synthesis of the analyzed data, it is revealed that the deposits like the Kovykta gas condensate field (GCF) show the zone-block structure of the platform cover formed under the influence of several stress fields closely associated with the stages of tectogenesis in the adjacent mobile belts. The next objective is to enhance the tectonophysical approach in order to develop a hierarchical model of the GCF zone-block structure, which details need to be known for improving the prediction of sites with the complicated stress-strain state of rocks and mitigating the risks associated with drilling exploration and production wells.

Creating the Integrated Model for Conceptual Engineering of Reservoir Management and Field Facilities Construction – Experience of Tazovskoe Oil and Gas-Condensate Field.

2021 ◽  
Author(s):  
Artem Igorevich Varavva ◽  
Renat Timergaleevich Apasov ◽  
Dmitry Alexeyevich Samolovov ◽  
Artem Viktorovich Elesin ◽  
Gaidar Timergaleevich Apasov ◽  
...  
Keyword(s):  
Growth Rates ◽  
Oil And Gas ◽  
High Growth ◽  
Integrated Model ◽  
Gas Condensate ◽  
Gas Oil ◽  
Full Field ◽  
Conceptual Engineering ◽  
Construction Experience ◽  
Oil Rim

Abstract The paper describes the experience of building a full-field integrated model (PK1 reservoir) of the Tazovskoye field, including a model of the reservoir, wells, and a gathering network, taking into account the external transportation system. In order to integrate the features of the field, such as the simultaneous development of a thin oil rim and a gas cap, high growth rates of the gas-oil ratio, oil wells - both ESP-operated and flowing, algorithms and tools have been developed, which are discussed in the paper. The results of the integrated model runs are given, main features of the solutions are highlighted.

scholarly journals Cross-Sector Style Analysis Of Global Equities

2012 ◽  
Vol 10 (11) ◽  
pp. 1
Author(s):  
Heng-Hsing Hsieh ◽  
Kathleen Hodnett
Keyword(s):  
Cross Section ◽  
Oil And Gas ◽  
Univariate Analysis ◽  
Equity Returns ◽  
Turnover Rates ◽  
Market Capitalization ◽  
Technology Sector ◽  
The Cross ◽  
Book To Market Ratio ◽  
Value Effect

Value effect, size effect, mean reversal of long-term losers and the momentum of short-term winners are well-documented efficient market anomalies that exist in the cross-section of equity returns. Prior literature suggests that investing in stocks that have relatively higher beta, higher book-to-market ratio, lower market capitalization, higher prior 12-month returns and lower prior 36-month returns can reap above-average returns. Stocks possessing these investment styles are either riskier, or subject to investor overreaction. This paper undertakes to examine these anomalies across different sectors of the global equity market. The results of the univariate analysis show that market capitalization, book-to-market ratio and market beta are prominent factors that consistently explain the cross-section of global equity returns over the period from 01 January 1999 to 31 December 2009. Basic materials and oil and gas sector is the best performing sector while financials and technology sectors are the worst performing sectors on a risk-adjusted return basis over the examination period. Examination of the log cumulative style payoffs suggests that the value effect and mean reversals are particularly strong across sectors during turbulent times. The close resemblance of the cumulative payoffs to prior 12- and 36-month returns for the consumers goods and services and industrials sectors, as opposed to the widening gaps between the cumulative payoffs to prior 12- and 36-month returns for the technology sector, are possibly due to the relatively tighter competition and higher turnover rates for market leaders in the technology sector.

scholarly journals Forecast and assessment of hydrocarbon potential of cretaceous and jurassic deposits of the Kara Sea shelf based on the results of geological exploration

2021 ◽  
pp. 141-148
Author(s):  
A. D. Dzyublo ◽  
◽  
V. V. Maslov ◽  
V. V. Sidorov ◽  
O. A. Shnip ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Water Area ◽  
Kara Sea ◽  
Gas Condensate ◽  
Hydrocarbon Potential ◽  
Geological Exploration ◽  
Gas Potential ◽  
Different Characteristics ◽  
Age Range ◽  
Gas Bearing

According to the oil and geological zoning, the water area of the Kara Sea, including the Ob and Taz Bays, is located on the border of three oil and gas-bearing regions: Yamal, Gydan and Nadym-Purskaya, having different characteristics of oil and gas potential by section and by area. As a result of geological exploration carried out in the water area and on the adjacent land, a wide age range of oil and gas potential was revealed. Seven fields have been discovered in the waters of the Yuzhno-Kara NGO: six gas condensate fields in Cretaceous Cenomanian-Albian deposits and one oil and gas condensate field in Cretaceous and Jurassic deposits. Large gas condensate fields have been explored in the Ob and Taz bays in the Cenomanian-Alb-Apt complex. The water area of the lips is one of the most important areas in terms of the growth of economically viable natural gas resources. According to the research results, it has been established that the UV potential of the Jurassic and Lower Cretaceous complexes of the Ob and Taz Bays is characterized as highly promising. Keywords: Kara Sea; shelf; cretaceous and jurassic deposits.

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