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Agus P Sasmito - One of the best experts on this subject based on the ideXlab platform.

  • numerical evaluation process design and techno economic analysis of Geothermal Energy Extraction from abandoned oil wells in malaysia
    Renewable Energy, 2021
    Co-Authors: Jundika C Kurnia, Seyed Ali Ghoreishimadiseh, Zulfan Adi Putra, Oki Muraza, Agus P Sasmito
    Abstract:

    Abstract Abandoned oil well can be a promising alternative to be retrofitted to extract Geothermal Energy than the conventional Geothermal well. This study investigates the potential of converting abandoned oil well into Geothermal Energy power plant by combining computational fluid dynamics (CFD) simulation, process simulation, and techno-economic analysis. A detailed CFD model was formulated and validated with verified data from published literature. The model was then utilized to study key performance variables on heat Extractions coupled with the Organic Rankine Cycle (ORC) to generate power and its subsequent techno-economic analysis. The results indicate that, due to relatively low temperature profile in typical Malaysian wells, the Levelized Cost Of Electricity (LCOE) of the ORC system was found to be almost double than that of conventional Geothermal technologies. To reduce the LCOE, at least four abandoned wells in a close proximity are required. Alternatively, other renewable Energy sources (e.g., solar, biomass) could be used to upgrade the Geothermal well. This techno-economic analysis shall serve as a preliminary assessment on the feasibility of utilizing abandoned oil wells in Malaysia for Geothermal Energy Extraction.

  • optimization of Geothermal Energy Extraction from abandoned oil well with a novel well bottom curvature design utilizing taguchi method
    Energy, 2019
    Co-Authors: Sharon W Y Cheng, Jundika C Kurnia, Seyed Ali Ghoreishimadiseh, Agus P Sasmito
    Abstract:

    Abstract Abandoned oil wells have a great potential to be converted into Geothermal Energy Extraction wells. However, these wells have low Energy conversion rates as compared to conventional Geothermal open loop wells. Therefore, increasing the heat transfer is one of the major concerns in the utilization of abandoned oil well for Geothermal Energy Extraction. This study is conducted to evaluate the heat transfer enhancement of a novel well bottom curvature design installed inside the wellbore using a computational fluid dynamics approach. Various well bottom curvature designs were evaluated, along with the effects of working fluid inlet temperature and flow rate. For optimization, Taguchi Statistical Method was adopted to determine the optimum parameter combination and their interactions. From the study, it is found that 0.5 m well bottom curvature is preferred for higher output temperature and heat transfer rate, whereas 0.8 m well bottom curvature is recommended for lowering pressure drop and producing higher CoP. On the other hand, lower injection temperature (288K) and lower injection rate (10 m3/h) produces better overall wellbore performance, except for higher outlet temperature purposes, where a higher injection temperature (298K) is favoured and higher heat transfer rate applications, where a higher injection rate (30 m3/h) is preferred.

  • a fractal network model for fractured porous media
    Fractals, 2016
    Co-Authors: Shuxia Qiu, Agus P Sasmito
    Abstract:

    The transport properties and mechanisms of fractured porous media are very important for oil and gas reservoir engineering, hydraulics, environmental science, chemical engineering, etc. In this paper, a fractal dual-porosity model is developed to estimate the equivalent hydraulic properties of fractured porous media, where a fractal tree-like network model is used to characterize the fracture system according to its fractal scaling laws and topological structures. The analytical expressions for the effective permeability of fracture system and fractured porous media, tortuosity, fracture density and fraction are derived. The proposed fractal model has been validated by comparisons with available experimental data and numerical simulation. It has been shown that fractal dimensions for fracture length and aperture have significant effect on the equivalent hydraulic properties of fractured porous media. The effective permeability of fracture system can be increased with the increase of fractal dimensions for fracture length and aperture, while it can be remarkably lowered by introducing tortuosity at large branching angle. Also, a scaling law between the fracture density and fractal dimension for fracture length has been found, where the scaling exponent depends on the fracture number. The present fractal dual-porosity model may shed light on the transport physics of fractured porous media and provide theoretical basis for oil and gas exploitation, underground water, nuclear waste disposal and Geothermal Energy Extraction as well as chemical engineering, etc.

H. Takahashi - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of long-term performance of Hot Dry Rock Geothermal Energy Extraction systems based on fractal fracture network model
    1999
    Co-Authors: K. Watanabe, N. Chigira, J. Willis-richards, Toshiyuki Hashida, H. Takahashi
    Abstract:

    Based on a fractal fracture network model of a Hot Dry Rock Geothermal reservoir, a numerical analysis of hydraulic stimulation and heat Extraction was carried out. Ogachi field, a demonstration field of Hot Dry Rock Geothermal Energy Extraction system, was chosen for the analysis. The hydraulic stimulation to create a two-layer reservoir was simulated numerically, and it became clear that fracture orientation has significant influence on the direction of the stimulated area, i.e., the reservoir direction. Using the fracture patterns chosen by temperature history matching of a 150 days circulation test, the long-term profile of production temperature at Ogachi was estimated. Although there are some assumption for water flow in the reservoir, the production temperature was estimated to be 150°C after 10 years.

  • progress toward a stochastic rock mechanics model of engineered Geothermal systems
    Journal of Geophysical Research, 1996
    Co-Authors: J Willisrichards, K. Watanabe, H. Takahashi
    Abstract:

    Hot dry rock Geothermal Energy Extraction experiments in artificial reservoirs created by hydraulic stimulation in naturally fractured crystalline rocks have been undertaken in several countries over the last 20 years. The experiments have had mixed results in terms of fluid recovery, system impedance, and heat Extraction. Numerical models have not yet delivered a generally agreed understanding of the processes and sensitivities involved in reservoir creation and circulation. In this paper a two-dimensional fracture network model is described, which attempts to address the problems of both reservoir creation and circulation using rock mass characterization and in situ stress data as the primary inputs with a view to encapsulating our present understanding of how such systems work. The model is a prototype for a three-dimensional version currently under development and is intended mainly for engineering sensitivity studies. The basis of the model lies in approximations of fracture mechanical behavior drawn from the rock mechanics literature, a very simplified analysis of the operative physical processes, and mapping of the connectivity of fracture networks to a fine resolution regular grid. Taken together, these permit the approximate resolution of what is normally a supercomputer problem on a personal computer. The model is applied to field data gathered at Fenton Hill, New Mexico; Hijiori, Yamagata Prefecture, Japan; and Rosemanowes, Cornwall, England.

  • Fractal characterization of subsurface fracture network for Geothermal Energy Extraction system
    1993
    Co-Authors: Watanabe, H. Takahashi
    Abstract:

    As a new modeling procedure of Geothermal Energy Extraction systems, the authors present two dimensional and three dimensional modeling techniques of subsurface fracture network, based on fractal geometry. Fluid flow in fractured rock occurs primarily through a connected network of discrete fractures. The fracture network approach, therefore, seeks to model fluid flow and heat transfer through such rocks directly. Recent geophysical investigations have revealed that subsurface fracture networks can be described by "fractal geometry". In this paper, a modeling procedure of subsurface fracture network is proposed based on fractal geometry. Models of fracture networks are generated by distributing fractures randomly, following the fractal relation between fracture length r and the number of fractures N expressed with fractal dimension D as N =C·r-D, where C is a constant to signify the fracture density of the rock mass. This procedure makes it possible to characterize Geothermal reservoirs by the parameters measured from field data, such as core sampling. In this characterization, the fractal dimension D and the fracture density parameter C of a Geothermal reservoir are used as parameters to model the subsurface fracture network. Using this model, the transmissivities between boreholes are also obtained as a function of the fracture densitymore » parameter C, and a parameter study of system performances, such as heat Extraction, is performed. The results show the dependence of thermal recovery of Geothermal reservoir on fracture density parameter C.« less

Mustafa Onur - One of the best experts on this subject based on the ideXlab platform.

  • analytical solutions for predicting and optimizing Geothermal Energy Extraction from an enhanced Geothermal system with a multiple hydraulically fractured horizontal well doublet
    Renewable Energy, 2022
    Co-Authors: Satuk Bugra Akdas, Mustafa Onur
    Abstract:

    Abstract In this study, novel analytical solutions are presented for predicting and optimizing Energy (heat and power) Extraction from an idealized single hot-dry rock (HDR) or hot-wet rock (HWR) through a multistage hydraulically fractured horizontal well doublet (MHFWD). The solutions are based on a two-dimensional analytical model that accounts for heat transfer mechanisms through an MHFWD completed in a homogeneous nearly impermeable matrix of the HDR/HWR system. The method of Laplace transformation is used to obtain the solutions. The solutions are inverted numerically and analytically to compute the fracture water outlet temperature and the temperature inside the matrix in the real-time domain. The analytical solutions presented in the study have not been presented elsewhere. The fluid outlet and matrix temperature distributions computed from the analytical model were validated against the results of a commercial simulator. The derived analytical solutions were integrated to convert thermal Energy to electric power, and a sensitivity study was performed to investigate the effect of certain parameters, such as fracture height, number, half spacing, injection rate, and injection temperature. In addition, the study provides insights and guidelines to predict, design, and optimize heat recovery and electricity production from an EGS system stimulated by an MHFWD.

  • analytical solutions for predicting and optimizing Geothermal Energy Extraction from an enhanced Geothermal system with a multiple hydraulically fractured horizontal well doublet
    Social Science Research Network, 2021
    Co-Authors: Satuk Bugra Akdas, Mustafa Onur
    Abstract:

    In this study, novel analytical solutions are presented for predicting and optimizing Energy (heat and power) Extraction from an idealized single hot-dry rock (HDR) or in the general enhanced Geothermal system (EGS) through a multistage hydraulically fractured horizontal well doublet (MHFWD). The solutions are based on a two-dimensional analytical model that accounts for heat transfer mechanisms through an MHFWD completed in a homogeneous impermeable matrix of the HDR system. The model assumes the fluid injected from one horizontal well at a constant rate with a lower temperature than that of the HDR, while heated fluid contacted with the hot-dry rock is produced from the other horizontal well at the same rate. The fluid outlet and matrix temperature distributions computed from the analytical model were validated against the results of a commercial simulator. Finally, the derived analytical solution was integrated to convert thermal Energy to electric power, and a sensitivity study was performed to investigate the effect of certain parameters, such as fracture height, number, half spacing; injection rate, and temperature. The study provides insights and guidelines that may be useful for designing and optimizing heat recovery and electricity production from an EGS system stimulated by an MHFWD.

D P Adhikary - One of the best experts on this subject based on the ideXlab platform.

  • numerical modeling of porous flow in fractured rock and its applications in Geothermal Energy Extraction
    Journal of Earth Science, 2015
    Co-Authors: Yucang Wang, Shimin Wang, D P Adhikary
    Abstract:

    Understanding the characteristics of hydraulic fracture, porous flow and heat transfer in fractured rock is critical for Geothermal power generation applications, and numerical simulation can provide a powerful approach for systematically and thoroughly investigating these problems. In this paper, we present a fully coupled solid-fluid code using discrete element method (DEM) and lattice Boltzmann method (LBM). The DEM with bonded particles is used to model the deformation and fracture in solid, while the LBM is used to model the fluid flow. The two methods are two-way coupled, i.e., the solid part provides a moving boundary condition and transfers momentum to fluid, while the fluid exerts a dragging force to the solid. Two widely used open source codes, the ESyS_Particle and the OpenLB, are integrated into one code and paralleled with Message Passing Interface (MPI) library. Some preliminary 2D simulations, including particles moving in a fluid and hydraulic fracturing induced by injection of fluid into a borehole, are carried out to validate the integrated code. The preliminary results indicate that the new code is capable of reproducing the basic features of hydraulic fracture and thus offers a promising tool for multiscale simulation of porous flow and heat transfer in fractured rock.

  • Numerical modeling of porous flow in fractured rock and its applications in Geothermal Energy Extraction
    Journal of Earth Science, 2015
    Co-Authors: Yucang Wang, Shimin Wang, Sheng Xue, D P Adhikary
    Abstract:

    Understanding the characteristics of hydraulic fracture, porous flow and heat transfer in fractured rock is critical for Geothermal power generation applications, and numerical simulation can provide a powerful approach for systematically and thoroughly investigating these problems. In this paper, we present a fully coupled solid-fluid code using discrete element method (DEM) and lattice Boltzmann method (LBM). The DEM with bonded particles is used to model the deformation and fracture in solid, while the LBM is used to model the fluid flow. The two methods are two-way coupled, i.e., the solid part provides a moving boundary condition and transfers momentum to fluid, while the fluid exerts a dragging force to the solid. Two widely used open source codes, the ESyS_Particle and the OpenLB, are integrated into one code and paralleled with Message Passing Interface (MPI) library. Some preliminary 2D simulations, including particles moving in a fluid and hydraulic fracturing induced by injection of fluid into a borehole, are carried out to validate the integrated code. The preliminary results indicate that the new code is capable of reproducing the basic features of hydraulic fracture and thus offers a promising tool for multiscale simulation of porous flow and heat transfer in fractured rock.

Dan Sui - One of the best experts on this subject based on the ideXlab platform.

  • Review and investigations on Geothermal Energy Extraction from abandoned petroleum wells
    Journal of Petroleum Exploration and Production Technology, 2019
    Co-Authors: Dan Sui, M. Røksland, Ekaterina Wiktorski, T. A. Basmoen
    Abstract:

    Geothermal Energy is a sustainable and renewable Energy source, which can be used in electricity production, space heating/cooling, and other industrial applications. In the recent years, it has been gathering more and more attention due to its numerous advantages as low impact on the surrounding environment, continuous power outputs, low greenhouse gas emissions, and worldwide availabilities. All make the Geothermal Energy a significant contributor to the global Energy productions in an environmentally friendly way. One big concern of Geothermal sources’ exploration is the expensive investment costs of Geothermal wells. Utilizing abandoned petroleum wells for the purpose of Geothermal Extraction is a novel idea. Well temperature profiles help to estimate how much heat can be transferred and produced from the wells. In this paper, a literature review has been done to investigate the existing applications on Geothermal Energy Extraction utilizing abandoned petroleum wells. Then, the case study demonstrates the importance of properties of working fluids, wellbore architecture, and operational parameters (circulation rate, inlet temperature, etc.) in Geothermal Energy production. The obtained results can be used to achieve an improved data interpretation and generate more optimal solutions. In Geothermal projects, extensive knowledge of the heat transfer is of great importance for the economical aspect and the performance of wells. Our work demonstrates that it is a good approach to provide cost-effective solutions to enhance heat Extraction from Geothermal wells.

  • Geothermal Energy Extraction from Abandoned Wells
    Energy Procedia, 2017
    Co-Authors: M. Røksland, T. A. Basmoen, Dan Sui
    Abstract:

    Below the surface of the earth, there exist Geothermal resources with the potential to make a significant contribution to the global demand for Energy in an environmental friendly way. Seemingly an endless resource, it could be capable of replacing other sources of Energy if treated wisely. A main challenge with the industry is related to the capital expensive costs of drilling the Geothermal wells, hence the introduction of abandoned petroleum wells is of interest. In this paper, we seek to investigate the potential amounts of heat extracted from beneath the surface, by retrofitting a double pipe heat exchanger in an abandoned petroleum well. The working fluid of choice is proposed to be circulated down through the annulus, then up through an inner, insulated geostring. By making use of a numerical simulator, we asses parameters of interest and obtain knowledge on how they affect the outlet temperature of the circulating working fluids and the accumulated heat extracted from the Geothermal wells.