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When simulating production a vapor–water mixture, it is usually assumed that boiling occurs already in the well. But this is not always the case; a phase transition can also arise in the reservoir. In this regard, a mathematical model is proposed that describes the associated heat and mass transfer processes in the reservoir around the production well and in the wellbore itself. The vaporization is...
A technology has been proposed for the integrated development of low-temperature geothermal resources for using their thermal and water potentials for various purposes. The possibility is substantiated for efficient development of geothermal resources by construction of binary geothermal power plants (GeoPP) using idle oil and gas wells that will significantly reduce capital investments for their...
Technological solutions have been proposed for extraction of heat accumulated in hot dry rock with various energy potentials. To extract the heat of low-temperature dry rock mass is shown to be advisable to ensure low heat carrier flow rates in the DHE; so for the depths H = 100, 200 m, the water flow rate G = 0.5–0.6 kg/s is optimal. The technology is presented for a hybrid solar–geothermal system...
A laser flash method (micro-flash apparatus LFA 457) and differential scanning calorimeter (DSC 204 F1) were employed to study of the temperature effect on the thermophysical properties (thermal diffusivity $$a$$ a , heat capacity $$C_{\text{P}}$$ C P and thermal conductivity $$\lambda$$ λ ) of the natural reservoir rock sample. A relationship between the thermophysical properties...
The current technology for enhanced geothermal system (EGS) typically involves drilling of deep injection and production wells to inject cold water into the injection well to the EGS reservoir depth, to extract heat by permeating through the fractured hot rock masses, collected by the production well and return to the surface as heated water. In this article, a new approach is proposed to develop...
Human beings have been benefiting from geothermal energy for different uses since the dawn of civilization in many parts of the world. One of the earliest uses of geothermal energy was for heating and it was used extensively by Romans in Turkey. The Aegean region is favored with a large number of thermal springs known since ancient times. However, it was in the twentieth century that geothermal energy...
Surfactant and polymer are used to improve oil recovery. The micro-emulsion phase composition, viscosity and interfacial tension vary with salinity and injection concentration of chemicals. The viscosity contrast which is very large for heavy oil reservoirs, results in various types of viscous instabilities. There is no comprehensive field-scale modelling on the viscous fingering affecting the oil...
Enhanced geothermal system (EGS) is the system for extracting the geothermal heat through the hydraulic fractured reservoir with the circulated fluid. Effective simulating method of the heat extract process is crucial to evaluate the efficiency of the EGS. In order to study the heat extraction process in the complex morphological fractures, the fluid flowing and heat transfer models through the analytical...
Deep geothermal energy exploitation has gained a lot of attentions in energy field due to its large reserve. Enhanced geothermal system (EGS) is the only one mode to explore hot dry rock (HDR) with real engineering practice throughout the world. To date, it is also a topic facing several key issues among sustainable and renewable energies because no commercialized mode has been made. Rock plays an...
In recent years, due to the shortage of fossil fuel energy and the deterioration of the environment, increasing attention has been paid to the utilization of geothermal power, especially medium–low-temperature geothermal energy, which occupies a large proportion of hot water resources. This paper summarizes the research status of Bi2Te3-, MgAgSb-, Mg3Sb2-, Mg2(Si,Sn,Ge)- Ag2Se-and AbSbTe2-based near-room-temperature...
Eastern part of peninsular India has exposed Precambrian metasediments, granitic gneissic rocks, basic and ultrabasic intrusives. More than 30 thermal springs issuing through these rocks have been located in the states of Bihar, Jharkhand, and West Bengal. Based on chemical geothermometry of these thermal waters, the reservoir temperatures are estimated to be in the range of 100–195 °C. The area has...
This paper presents a case study of the geotechnical characterization for subsidence analyses of an Italian clastic rock gas reservoir at about 1200–1400 m sub sea level. A coherent and exhaustive dataset including lab data and well log measurements allowed to address the main aspects of the rock material characterization. The a priori qualitative inspection of the cores showed significant variability...
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