THE GEOLOGIC CONTROLS OF GEOTHERMAL FLUID FLOW: A 3D ANALYSIS OF THE BRADYS GEOTHERMAL FIELD, NV, USA

2017 ◽  
Author(s):  
Drew L. Siler ◽  
◽  
James E. Faulds
Keyword(s):  
Fluid Flow ◽  
Geothermal Field ◽  
3D Analysis ◽  
Geothermal Fluid ◽  
Geologic Controls

scholarly journals Machine learning to identify geologic factors associated with production in geothermal fields: a case-study using 3D geologic data, Brady geothermal field, Nevada

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Drew L. Siler ◽  
Jeff D. Pepin ◽  
Velimir V. Vesselinov ◽  
Maruti K. Mudunuru ◽  
Bulbul Ahmmed
Keyword(s):  
Machine Learning ◽  
Fluid Flow ◽  
Hydrothermal System ◽  
Geothermal Field ◽  
Hydrothermal Systems ◽  
Electricity Production ◽  
Fault System ◽  
Macro Scale ◽  
Geologic Data ◽  
Geologic Controls

AbstractIn this paper, we present an analysis using unsupervised machine learning (ML) to identify the key geologic factors that contribute to the geothermal production in Brady geothermal field. Brady is a hydrothermal system in northwestern Nevada that supports both electricity production and direct use of hydrothermal fluids. Transmissive fluid-flow pathways are relatively rare in the subsurface, but are critical components of hydrothermal systems like Brady and many other types of fluid-flow systems in fractured rock. Here, we analyze geologic data with ML methods to unravel the local geologic controls on these pathways. The ML method, non-negative matrix factorization with k-means clustering (NMFk), is applied to a library of 14 3D geologic characteristics hypothesized to control hydrothermal circulation in the Brady geothermal field. Our results indicate that macro-scale faults and a local step-over in the fault system preferentially occur along production wells when compared to injection wells and non-productive wells. We infer that these are the key geologic characteristics that control the through-going hydrothermal transmission pathways at Brady. Our results demonstrate: (1) the specific geologic controls on the Brady hydrothermal system and (2) the efficacy of pairing ML techniques with 3D geologic characterization to enhance the understanding of subsurface processes.

Step-over fault zones controlling geothermal fluid-flow and travertine formation (Denizli Basin, Turkey)

Geothermics ◽  
2021 ◽  
Vol 89 ◽  
pp. 101941
Author(s):  
Andrea Brogi ◽  
M. Cihat Alçiçek ◽  
Domenico Liotta ◽  
Enrico Capezzuoli ◽  
Martina Zucchi ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Fault Zones ◽  
Geothermal Fluid ◽  
Step Over

Fluid flow in the rotorua geothermal field derived from isotopic and chemical data

Geothermics ◽  
1992 ◽  
Vol 21 (1-2) ◽  
pp. 141-163 ◽  
Author(s):  
M.K. Stewart ◽  
G.L. Lyon ◽  
B.W. Robinson ◽  
R.B. Glover
Keyword(s):  
Fluid Flow ◽  
Geothermal Field ◽  
Chemical Data

Feasibility, Design and authorization of a zero-emission Geothermal Power Plant in Italy; Case Study: “Montenero” Project

2020 ◽  
Author(s):  
Paolo Basile ◽  
Roberto Brogi ◽  
Favaro Lorenzo ◽  
Tiziana Mazzoni
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Geothermal Field ◽  
Geothermal Reservoir ◽  
Gas Content ◽  
Geothermal Resources ◽  
Geothermal Fluid ◽  
Geothermal Power Plant ◽  
Green Power ◽  
Geothermal Power

<p><span><span>Social consensus is a </span><span>condition precedent for any intervention having an impact on the territory, such as geothermal power plants. Therefore, private investors studied and proposed innovative solution for the exploitation of the medium enthalpy geothermal resource, with “zero emissions” in atmosphere, with the target of minimizing its environmental impact. “Montenero” project, developed by GESTO Italia, complies with this precondition.</span></span></p><p><span><span>The area covered b</span><span>y the exploration and exploitation permit is located on the northern edge of the great geothermal anomaly of Mt. Amiata (Tuscany), about 10 km north of the geothermal field of Bagnore, included in the homonymous Concession of Enel Green Power.</span></span></p><p><span><span>The geological - structural setting of the area around the inactive volc</span><span>ano of Mt. Amiata has been characterized by researches for the geothermal field of Bagnore, carried out by Enel Green Power over the years. The geothermal reservoir is present in the limestone and evaporitic rocks of the “Falda Toscana”, below which stands the Metamorphic Basement, as testified by the wells of geothermal field of Bagnore. The foreseen reservoir temperature at the target depth of 1.800 m is 140 °C, with an incondensable gas content of 1,8% by weight.</span></span></p><p><span><span>The project was presented to the authorities in 2013 and it is </span><span>now undergoing exploitation authorization and features the construction of a 5 MW ORC (Organic Ranking Circle) binary power plant. The plant is fed by three production wells for a total mass flow rate of 700 t/h. The geothermal fluid is pumped by three ESPs (Electrical Submersible Pump) keeping the geothermal fluid in liquid state from the extraction through the heat exchangers to its final reinjection three wells.</span></span></p><p><span><span>The reinjection temperature is 70 °C and the circuit pressure is maintained above the </span><span>incondensable gas bubble pressure, i.e. 40 bar, condition which prevents also the formation of calcium carbonate scaling. The confinement of the geothermal fluid in a “closed loop system” is an important advantage from the environmental point of view: possible pollutants presented inside the geothermal fluid are not released into the environment and are directly reinjected in geothermal reservoir.</span></span></p><p><span><span>The </span><span>environmental authorization procedure (obtained) has taken into account all the environmental aspects concerning the natural matrices (air, water, ground, ...) potentially affected by the activities needed for the development, construction and operation of “Montenero” ORC geothermal power plant. A numerical modeling was designed and applied in order to estimate the effect of the cultivation activity and to assess the reinjection overpressure (seismic effect evaluation). The project also follows the “best practices” implemented in Italy by the “Guidelines for the usage of medium and high enthalpy geothermal resources” prepared in cooperation between the Ministry of Economic Development and the Ministry of the Environment.</span></span></p>

scholarly journals CFD Investigation of Fluid Flow Over Aerofoil With and Without Dimple

2020 ◽  
Author(s):  
Uzair Sajjad ◽  
Khalid Hamid ◽  
Naseem Abbas
Keyword(s):  
Boundary Layer ◽  
Fluid Flow ◽  
Cross Section ◽  
Turbulence Model ◽  
Aerodynamic Performance ◽  
3D Analysis ◽  
Cad Model ◽  
Uniform Cross Section ◽  
Solid Works ◽  
Lift And Drag

Abstract This work labels the effect of dimples on aerodynamic performance of an airfoil. NACA 0018 having a uniform cross section has been evaluated in this study. Eclipse dimpled airfoil is tested and compared with plain airfoil and with the airfoil in the literature [23,24]. Flows taken into consideration are subsonic. The CAD model is drawn in Solid works 2016, while the simulations are performed in Ansys 18.3. A 2-D CFD investigation is performed on both models using k-w turbulence model, subsequently the better one is selected based on the results. 3D analysis is performed on a segment of airfoil having one dimple. Lift and drag coefficients are calculated for various angles of attack. This investigation tells that dimples affect the aerodynamics of airfoil, particularly for various angle of attacks. For smaller angle of attacks, plain airfoil showed less drag and higher lift, but totally different trend is achieved with increasing angle of attack whereas 20° was found to be the optimum angle. The findings proved that dimples on the surface delay the separation of boundary layer by generating additional turbulence on the surface and consequently reduce the formation of wake, which in turn decreases drag significantly.

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