Numerical simulation of heat extraction performance in enhanced geothermal system with multilateral wells
TL;DR: In this paper, an enhanced geothermal system with multilateral wells is proposed to extract heat from hot dry rock, where one main wellbore is drilled to hot dry rocks and several injection and production multilateral well are side-tracked from the main well bore in upper and lower formation, respectively.
About: This article is published in Applied Energy.The article was published on 2018-05-15. It has received 221 citations till now. The article focuses on the topics: Enhanced geothermal system & Injection well.
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TL;DR: In this paper, the authors review the current state-of-the-art enhanced geothermal systems around the world, especially the United States, Philippines, Indonesia, Turkey and New Zealand, and address the challenges and barriers to its adoption from the institutional, regulatory, technological and financial aspects.
120 citations
Cites background from "Numerical simulation of heat extrac..."
...Among the various geothermal energy technologies, enhanced geothermal systems (EGS) are more efficient in terms of producing electricity and could supply a significant fraction of the lowtemperature thermal energy used [7,8]....
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TL;DR: In this paper, the authors provide a detailed review of the barriers, identify credible solutions and highlight options for enhancing geothermal capacity and energy production on a global scale required to meet ‘net-zero’ carbon emission targets.
Abstract: Geothermal Energy (GE) is a non-carbon renewable source of sustainable energy with untapped potential for mitigating the threat of climate change. To achieve a sustainable pathway for development, evaluation of technical and economic constraints must be addressed within a framework of environmental governance and social and legal challenges that arise during implementing of geothermal projects. Key barriers to deployment of geothermal resources on a wide scale include high capital costs, location and quality of resource at different depths and opposition by local communities. Here we provide a detailed review of the barriers, identify credible solutions and highlight options for enhancing geothermal capacity and energy production on a global scale required to meet ‘net-zero’ carbon emission targets. Globally by 2050 as part of a strategy to reduce greenhouse gases. This study is a valid source for upcoming studies and implementations by analyzing the influential factors on the development and future of geothermal energy.
109 citations
TL;DR: In this paper, a model is developed for simulating CO2 circulating in a geothermal horizontal well, and the energy and momentum balance equations of CO2 flow in long tube and annuli are solved numerically.
94 citations
TL;DR: In this article, a 3D thermal-hydraulic-mechanical coupled model is used to compare heat extraction performance of different complex fracture networks and to provide suggestions for fracturing operation of an enhanced geothermal system (EGS).
92 citations
TL;DR: In this paper, the authors presented a three-dimensional thermal-hydraulic-mechanical coupled model to analyze performance of EGS in fractured geothermal reservoirs with different natural fractures scales, reservoir stimulation scales, and working fluids (water and CO2), aimed to guide reservoir stimulation and fracture parameter design.
90 citations
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340 citations
TL;DR: In this paper, the current state-of-the-art, recent advances and emerging trends in geothermal reservoir simulation are reviewed, as well as some of the most recent trends in the field.
333 citations
TL;DR: In this paper, the authors systematically review all of the EGS projects worldwide, based on the information available in the public domain, and classify them by country, reservoir type, depth, reservoir temperature, stimulation methods, associated seismicity, plant capacity and current status.
Abstract: Enhanced (or engineered) geothermal systems (EGS) have evolved from the hot dry rock concept, implemented for the first time at Fenton Hill in 1977. This paper systematically reviews all of the EGS projects worldwide, based on the information available in the public domain. The projects are classified by country, reservoir type, depth, reservoir temperature, stimulation methods, associated seismicity, plant capacity and current status. Thirty five years on from the first EGS implementation, the geothermal community can benefit from the lessons learnt and take a more objective approach to the pros and cons of ‘conventional’ EGS systems.
309 citations
TL;DR: In this paper, a new 1D and 2D solid cylindrical source model for ground-coupled heat pump (GCHP) systems is presented to consider both the radial dimension and the heat capacity of the borehole or pile.
275 citations
TL;DR: In this paper, the general governing equations for coupled thermohydromechanical (THM) processes in saturated and unsaturated geologic formations are presented and four finite element codes for modeling of such system are reviewed.
246 citations