Preface to the Second Edition

Grant, Malcolm A.; Bixley, Paul F.

doi:10.1016/b978-0-12-383880-3.10025-3

Cited by 5 publications

(10 citation statements)

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“…The earliest use of geothermal energy is the exploitation of hot springs found worldwide. These springs have been used for heating, bathing, and cooking for millenniums [5]. The first use of geothermal heat to produce electrical power began in 1904 in Larderello, Italy by utilizing the steam from a hot spring [5].…”

Section: Geothermal Energy Systems Overviewmentioning

confidence: 99%

Modelling of heat recovery from suspended oil wells

England¹

2021

Preprint

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A geothermal system for suspended oil wells is designed to produce 1.25MW of heat. After a review of literature, a concentric double pipe heat exchanger was the system chosen. A control volume model was created to calculate the heat transfer characteristics of the system. After completing the model a suspended oil well near Hinton, Alberta was selected as a candidate well for a geothermal system. The well contains 33 perforated sections which need to be closed off. Three designs to accomplish this are proposed. The model predicted that the best design uses cement squeezes to close off the perforations and produces a net energy of 2.4MW at its optimum operating condition, with a mass flow rate of 8.18kg/s. When producing 1.25MW of heat, the design has a net energy of 1.2MW. It is found that internal heat generation plays a large roll in these systems.

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Section: Geothermal Energy Systems Overviewmentioning

confidence: 99%

Modelling of heat recovery from suspended oil wells

England¹

2021

Preprint

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“…The heated water then becomes vapor and is contained in the permeable reservoir beneath the cap rock. Due to the combined effect of insufficient seal integrity and heated underground water, most geothermal resources are underpressured [1][2][3]. Additionally, most geothermal reservoirs contain natural fractures that result in highly permeable reservoirs [4].…”

Section: Introductionmentioning

confidence: 99%

“…Considering that most geothermal wells are drilled directionally, losing a well creates additional economic risk. Generally, a vapor-dominated geothermal field experiences a rapid depletion of steam production [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The magmatic steam plume, including corrosive gas, moves upward through the center, and the steam spreads laterally in the permeable vapor-dominated reservoir. There is a liquid-dominated zone underlying the vapor zone, which is a very dilute steam condensate [3,5,14,15]. Patuha started producing electricity in September 2014, with a dry steam cycle of approximately 60 MWe power generation capacity.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic Stimulation of Enhanced Geothermal System: A Case Study at Patuha Geothermal Field, Indonesia

Lee

Bae

Permadi

et al. 2023

International Journal of Energy Research

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This paper discusses a case study on the enhanced geothermal system (EGS), which entails a hydraulic stimulation at Patuha geothermal field, West Java, Indonesia. Patuha field is a volcano-hosted vapor-dominated geothermal system. A hydraulic stimulation was designed with 6,360 m3 (=40,000 barrels) of water injection to evaluate the enhancement in steam production. The water injection was conducted in three phases: a step-up period, a plateau period with a constant rate, and a step-down period, which raised the bottom hole pressure effectively and positively influenced formation. In addition, in EGS, rapid restorations of pressure and temperature to their pretest values near the bottom hole were observed, unlike in a typical nonvolcanic system. Hall plots, i.e., the Hall integral and Hall derivative, confirmed that the geothermal reservoir was stimulated, and thus, the hydraulic stimulation increased the steam production up to 11.4% at other production wells that were located near the cold-water injector.

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“…The European HDR project Soultz-sous-Forêts in France was categorized as a PS, although there has been much debate among experts as to whether this system should be cate- High water losses, precipitation of anhydrite, DiPippo (2012); rapid temperature drawdown in one production well, Grant and Bixley (2011) Ogachi 6.7 * * to 20 * * (test), Kaieda et al (2005) Multiple wells with multiple fracture zones; hydraulic fracturing, Kaieda et al (2005) Few microseismic, Kaieda et al (2010) None * 0 * 0 * Low water recovery rate in circulation tests, Kaieda et al (2005) R&R, 2013). This discussion has probably arisen because two different reservoirs are connected to the project: the upper reservoir being in a fractured granite formation with higher permeabilities (3 × 10 −14 m 2 ) and the lower reservoir in a fresh granite formation with much poorer permeabilities (1 × 10 −17 m 2 ) (Kohl et al, 2000).…”

Section: Petrothermal Systemsmentioning

confidence: 99%

Overcoming challenges in the classification of deep geothermal potential

2015

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Abstract. The geothermal community lacks a universal definition of deep geothermal systems. A minimum depth of 400 m is often assumed, with a further sub-classification into middle-deep geothermal systems for reservoirs found between 400 and 1000 m. Yet, the simplistic use of a depth cut-off is insufficient to uniquely determine the type of resource and its associated potential. Different definitions and criteria have been proposed in the past to frame deep geothermal systems. However, although they have valid assumptions, these frameworks lack systematic integration of correlated factors. To further complicate matters, new definitions such as hot dry rock (HDR), enhanced or engineered geothermal systems (EGSs) or deep heat mining have been introduced over the years. A clear and transparent approach is needed to estimate the potential of deep geothermal systems and be capable of distinguishing between resources of a different nature. In order to overcome the ambiguity associated with some past definitions such as EGS, this paper proposes the return to a more rigorous petrothermal versus hydrothermal classification. This would be superimposed with numerical criteria for the following: depth and temperature; predominance of conduction, convection or advection; formation type; rock properties; heat source type; requirement for formation stimulation and corresponding efficiency; requirement to provide the carrier fluid; well productivity (or injectivity); production (or circulation) flow rate; and heat recharge mode. Using the results from data mining of past and present deep geothermal projects worldwide, a classification of the same, according to the aforementioned criteria is proposed. ReviewIn the past, definitions such as hydrothermal and petrothermal have been created to categorize deep geothermal systems, i.e. systems with a depth greater than 400 m, into two groups. The first group includes geothermal reservoirs that provide a heat source, a natural reservoir with high enough permeability, and a water recharge. The second group comprises geothermal systems where only a natural heat source exists, while the underground heat exchanger must be created artificially and water must be supplied for water circulation within. Hydrothermal systems (HSs) are clearly dominant in comparison to petrothermal systems (PSs) with regards to number of occurrences worldwide and megawatts of electricity generated.In 1970, the hot dry rock (HDR) concept was introduced to describe a system which uses hot and dry rock as a heat source and where an artificial underground heat exchanger had to be created (Cummings and Morris;1979;Tester et al., 1989;Potter et al., 1974). However, during the history of deep drilling, it was found that most rocks are actually not completely dry, but contain at least some naturally occurring water. This finding led to the development of a definition of hot wet rock (Duchane, 1998). In addition, the category of hot fractured rock was created to describe geothermal reservoirs that consist of hot rocks, ty...

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Preface to the Second Edition

Cited by 5 publications

References 0 publications

Modelling of heat recovery from suspended oil wells

Modelling of heat recovery from suspended oil wells

Hydraulic Stimulation of Enhanced Geothermal System: A Case Study at Patuha Geothermal Field, Indonesia

Overcoming challenges in the classification of deep geothermal potential

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