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.

Determination of Borders for Resistive Oil and Gas Reservoirs by Deviation Rate Using the Hole-to-surface Resistivity Method

2007 ◽  
Vol 50 (3) ◽  
pp. 790-795 ◽  
Author(s):  
Jing-Tian TANG ◽  
Ji-Feng ZHANG ◽  
Bing FENG ◽  
Jia-Yong LIN ◽  
Chang-Sheng LIU
Keyword(s):  
Oil And Gas ◽  
Surface Resistivity ◽  
Gas Reservoirs ◽  
Resistivity Method ◽  
Deviation Rate ◽  
Oil And Gas Reservoirs

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 Experimental evaluation of compressibility coefficients for fractures and intergranular pores of an oil and gas reservoir

2021 ◽  
Vol 251 ◽  
pp. 658-666
Author(s):  
Vitaly Zhukov ◽  
Yuri Kuzmin
Keyword(s):  
Stress State ◽  
Oil And Gas ◽  
Pore Space ◽  
Total Porosity ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Intergranular Porosity ◽  
Hydrocarbon Fields ◽  
Oil And Gas Reservoir

The paper is devoted to studies of the volumetric response of rocks caused by changes in their stress state. Changes in the volume of fracture and intergranular components of the pore space based on measurements of the volume of pore fluid extruded from a rock sample with an increase in its  all-round compression have been experimentally obtained and analyzed.  Determination of the fracture and intergranular porosity components is based on the authors' earlier proposed method of their calculation using the values of longitudinal wave velocity and total porosity. The results of experimental and analytical studies of changes in porosity and its two components (intergranular and fractured) under the action of effective stresses are considered. This approach allowed the authors to estimate the magnitude  of the range of changes in the volumetric compressibility of both intergranular pores and fractures in a representative collection of 37 samples of the Vendian-age sand reservoir of the Chayanda field. The method of separate estimation of the compressibility coefficients of fractures and intergranular pores is proposed, their values and dependence on the effective pressure are experimentally obtained. It is determined that the knowledge of the values of fracture and intergranular porosity volumetric compressibility will increase the reliability of estimates of changes in petrophysical parameters of oil and gas reservoirs caused by changes in the stress state during the development of hydrocarbon fields.

scholarly journals The geochemical role of meteoric waters as a factor in the formation of the void space of oil and gas reservoirs

2020 ◽  
pp. 3-13
Author(s):  
O.P. Abramova ◽  
A.V. Goreva ◽  
R.R. Gumerova
Keyword(s):  
Oil And Gas ◽  
Water Saturation ◽  
Upper Permian ◽  
Genetic Profile ◽  
Void Space ◽  
Gas Reservoirs ◽  
Filtration Properties ◽  
The Relationship ◽  
Gas Bearing

The features of the chemical composition of formation waters of the Upper Permian, Lower and Middle Triassic aquifers within individual structures of the Malozemelsk-Kolguev monocline of the Timan-Pechora oil and gas bearing basin are examined. It is shown that the aquifers that, despite their remoteness from the recharge areas, had experienced repeated processes of dipping and uplifting of the territory, preserved the infiltration waters, but significantly transformed ones. To identify their genetic profile and determine the relationship with the processes of catagenetic changes, hydrochemical coefficients and indices of water saturation of calcium carbonate and calcium sulfate are calculated. It is established that the examined infiltration waters are characterized by high aggressiveness, dissolution ability, leaching and removal of main minerals. It is pointed out that the consequence of these processes is the formation of secondary void space and the creation of high capacitive and filtration properties of rocks. The universality of geochemical interaction between water and rocks in thermodynamically open geological systems is emphasized and it is confirmed by individual geological examples that the heterogeneity of the hydrochemical field can act as a cause of screening zones of oil and gas accumulation, as well as provide appropriate conditions for localization of hydrocarbon fluids.

Poroperm properties of reservoir rocks at Kachalivske oil and gas condensate field

2018 ◽  
pp. 18-24
Author(s):  
V. V. Fedoriv ◽  
Ya. M. Ftemov ◽  
I. O. Piatkovska ◽  
A. O. Trubenko
Keyword(s):  
Oil And Gas ◽  
Statistical Processing ◽  
Gas Condensate ◽  
Reservoir Rock ◽  
Geophysical Research ◽  
Reliable Determination ◽  
Reservoir Rocks ◽  
Experimental Laboratory ◽  
Rock Parameters

The results of laboratory, geological and geophysical research methods in Visean and Tournaisian reservoir rocks with complex type deposits of Kachalivske oil and gas condensate feild were analysed. The connection of structural and lithological characteristics with geophysical parameters was substantiated. In some cases, in the Visean and Tournaisian deposits, the multicomponent composition of the rock matrix affects the actual value of geophysical parameter, leading to erroneous conclusions about the reservoir, the nature of the saturation and depth of occurrence. As a result of the statistical processing of experimental laboratory studies and geophysical studies of wells in the Visean and Tournaisian deposits at Kachalivske oil and gas condensate feild, petrophysical models of reservoir rocks were developed allowing reliable determination of poroperm properties of such reservoir rocks. The developed models can be used both for determination the reservoir rock parameters and for quick interpretation of geophysical research results.

scholarly journals The use of gamma-spectrometry and gamma-gamma-density logging for the study of reservoir rocks of complex structures

2018 ◽  
pp. 41-46
Author(s):  
V. V. Fedoriv
Keyword(s):  
Organic Matter ◽  
Gamma Spectrometry ◽  
Oil And Gas ◽  
Complex Structure ◽  
Complex Structures ◽  
Rock Density ◽  
Reservoir Rocks ◽  
Gamma Density ◽  
Close Relationship ◽  
Petrophysical Model

The results of the study of the poroperm properties of the complex structure reservoir rocks of the neogene deposits at the Letnianskyi gas condensate field are considered. The petrophysical model for determining the bulk content of the main components of oil and gas reservoirs is given by data of gamma-gamma-density logging and spectrometric gamma-logging. The petrophysical model of the joint use of the results of gamma-spectrometry and gamma-gamma-density logging is shown. As a result of data analysis, it has been established that there is a close relationship between uranium content and bulk density. It should also be noted that there is a close relationship between the solid organic matter and the thorium content. It has been shown that under the conditions of complex structure reservoirs, the complex processing of data of gamma spectrometry and gamma-gamma-density logging allows quantitatively to determine the following parameters in complex structures:  clayness, porosity, content of solid organic matter and rock density.

scholarly journals Development of Greener D-Metal Inorganic Crosslinkers for Polymeric Gels Used in Water Control in Oil and Gas Applications

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4262
Author(s):  
Hassan I. Nimir ◽  
Ahmed Hamza ◽  
Ibnelwaleed A. Hussein
Keyword(s):  
Charge Density ◽  
Low Temperatures ◽  
Oil And Gas ◽  
Water Control ◽  
Gas Reservoirs ◽  
Low Salinity ◽  
High Charge Density ◽  
Reservoir Conditions ◽  
Salinity Water ◽  
High Level

Crosslinkable polymers, such as polyacrylamide (PAM), are widely applied for water control in oil and gas reservoirs. Organic and inorganic crosslinkers are used to formulate a gel with PAM. Although chromium has a high level of toxicity, it has been implemented as an effective crosslinker combined with carboxylates because of the controllability of crosslinking time at low temperatures. The objective of this work was to develop greener d-metal inorganic crosslinkers based on cobalt, copper, and nickel to replace chromium for application at reservoir conditions. The obtained results showed that the gelation chemistry of the developed systems depends on the metal charge density. The gelation of PAM with d-metals depends on pH and temperature for low- and high-charge density, respectively. Cobalt (II) acetate (CoAc) was effective at high temperatures (130–150 °C) and forms (4% CoAc + 9%PAM) stable, and strong gels at a pH > 7 with a storage modulus exceeding 4300 Pa. However, Nickel Acetate and Cupper Acetate formed stable weak gels at low temperatures (50–70 °C) and a pH > 6 and gel decomposition was observed upon increasing the temperature. The developed formulations were compatible with low-salinity water (1000 ppm NaCl).

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