Present status of the Ogachi HDR Project, Japan, and future plans

Hori, Yoshinao; Kitano, Koichi; Kaieda, Hideshi; Kiho, Kenzo

doi:10.1016/s0375-6505(99)00034-6

Cited by 23 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous researchers have contributed to the technical description of HDR reservoirs, proposing heat transfer models for geothermal projects [19,20]. Extensive literature review and work on HDR reservoirs has been summarized in several studies [21,22]. For heat transfer models and their applications in practice, see References [14,23] on classical heat equations and [24][25][26] on fractional heat equations.…”

Section: Generic Models and Case Studiesmentioning

confidence: 99%

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

Zuo

Weijermars

2019

Fluids

View full text Add to dashboard Cite

A simple, semi-analytical heat extraction model is presented for hydraulically fractured dry reservoirs containing two subparallel horizontal wells, connected by a horizontal fracture channel, using injected brine as the working fluid. Heat equations are used to quantify the heat conduction between fracture walls and circulating brine. The brine temperature profiles are calculated for different combinations of fracture widths, working fluid circulation rates, and initial fracture wall temperatures. The longevity of the geothermal heat extraction process is assessed for a range of working fluid injection rates. Importantly, dry geothermal reservoirs will not recharge heat by the geothermal flux on the time scale of any commercial heat extraction project. A production plan is proposed, with periodic brine circulation maintained in a diurnal schedule with 8 h active production alternating with 16 h of pump switched off. A quasi-steady state is achieved after both the brine temperature and rock temperature converge to a limit state allowing fracture-wall reheating by conduction from the rock interior in the diurnal production schedule. The results of this study could serve as a fast tool for assisting the planning phase of geothermal reservoir design as well as for operational monitoring and management.

show abstract

Section: Generic Models and Case Studiesmentioning

confidence: 99%

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

Zuo

Weijermars

2019

Fluids

View full text Add to dashboard Cite

show abstract

“…Many scholars believe that as long as the temperature is at least 200 • C, the depth of the rock body is reasonable, and there are with an appropriate temperature (~200 °C) [3]. Many scholars believe that as long as the temperature is at least 200 °C, the depth of the rock body is reasonable, and there are no or few cracks, then the rock mass can be called hot dry rock [4,5]. Currently, China generally refers to rocks with high temperatures, low porosities, low permeabilities, and temperatures higher than 180 °C as hot dry rocks.…”

Section: Introductionmentioning

confidence: 99%

A Method for Determining Target Areas of Hot Dry Rock Resources: A Case Study in Continental China

Wang,

Jiang

et al. 2024

Energies

View full text Add to dashboard Cite

Geothermal resources have been recognized as important sources of clean renewable energy. The exploration, development, and utilization of geothermal resources, especially hot dry rock (HDR) resources, are highly important for achieving peak carbon and carbon neutrality. However, there is no comprehensive evaluation method for determining HDR target areas, and the evaluation scale and application disciplines are relatively simplistic. In this paper, we sought to optimize the identification of HDR target areas through a multiscale and multidisciplinary method and formed a set of generalized and demonstrative processes to guide the exploration of HDR resources. Through practical application to the Gonghe Basin and the Zhangzhou Basin, it was found that the comprehensive geothermal conditions of the Gonghe Basin are superior to those of the Zhangzhou Basin, and the geothermal reservoir depth, geothermal reservoir temperature, geothermal gradient, and heat flow are the four most important factors affecting hot dry rock geothermal resources. Using this method, the prioritization of target areas changes from a qualitative study to a quantitative and semiquantitative study, increasing the specificity and reliability of the decision-making process.

show abstract

“…As a clean and renewable energy source, geothermal energy may be used for both power generation and heating. − At present, artificial stimulation (heat, force, chemistry) is mainly used to extract geothermal energy, that is, Enhanced Geothermal System (EGS). − In EGS, water is usually used as the fracturing medium in the hydraulic stimulation and the heat exchange medium in heat mining technology. − The thermal recovery efficiency of medium- and low-temperature geothermal resources is limited by fluid properties, wellbore depth, and heat transfer efficiency. , In addition to the high energy consumption of the thermal cycle, there are disadvantages such as scaling in the wellbore caused by water–rock interactions, when water is used as the heat-exchange medium. , Also, with changes in in situ stress and reservoir pressure, water has a risk of activating faults and inducing earthquakes. At this moment, earthquake events induced by hydraulic fracturing in dry-hot rock have occurred in Basel, Switzerland, and Soultz, France, among other places. − The physical properties of CO 2 suggest that it can be used as a heat-exchange medium.…”

Section: Introductionmentioning

confidence: 99%

Changes in Pore Structure of Dry-hot Rock with Supercritical CO₂ Treatment

Zhou

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

Using supercritical CO 2 as a fracturing or heat exchange medium can not only improve the thermal recovery efficiency of geothermal energy but can also store CO 2 and reduce CO 2 emissions. The pore structure characteristics are important factors affecting the permeability of the dry-hot rock (granite in this study), as well as the key parameters to predict any induced earthquakes. However, the influence of supercritical CO 2 on the pore structure of granite is not clear. In this study, nuclear magnetic resonance, X-ray diffraction, and scanning electron microscopy were performed to study the effects of supercritical CO 2 saturation on the granite over time. The results showed that many new dissolution pores are found on the surface of calcite after supercritical CO 2 saturation, and the formation of secondary minerals can also be observed. The crystallinity of granite mineral particles decreased after supercritical CO 2 saturation. In addition, the proportion of micropores increased, while the proportion of mesopores and macropores decreased compared to the unexposed granite. Supercritical CO 2 saturation improved the connectivity among micropores, mesopores, and macropores, and longer saturation times in supercritical CO 2 led to stronger microscopic heterogeneity in the granite. Furthermore, ultrasonic wave velocity results showed that the granite was damaged by the supercritical CO 2 saturation. In the early stage of supercritical CO 2 saturation, the damage coefficient of granite developed rapidly. With the increase of the saturation time, the damage coefficient of granite remained stable.

show abstract

Present status of the Ogachi HDR Project, Japan, and future plans

Cited by 23 publications

References 1 publication

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

A Method for Determining Target Areas of Hot Dry Rock Resources: A Case Study in Continental China

Changes in Pore Structure of Dry-hot Rock with Supercritical CO₂ Treatment

Contact Info

Product

Resources

About

Present status of the Ogachi HDR Project, Japan, and future plans

Cited by 23 publications

References 1 publication

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

Longevity of Enhanced Geothermal Systems with Brine Circulation in Hydraulically Fractured Hydrocarbon Wells

A Method for Determining Target Areas of Hot Dry Rock Resources: A Case Study in Continental China

Changes in Pore Structure of Dry-hot Rock with Supercritical CO2 Treatment

Contact Info

Product

Resources

About

Changes in Pore Structure of Dry-hot Rock with Supercritical CO₂ Treatment