Application of geochemical modelling for hydraulic stimulation in enhanced geothermal systems

Lee, Junbeum; Chung, Eunhyea

doi:10.1080/12269328.2020.1832923

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Lifting machinery transmission box is one of the core components of low-speed and heavy-duty hydraulic lifting and rotating system [5,6]. With the development and continuous improvement of machinery and hydraulic technology, the development prospects of lifting machinery transmission control technology are very broad [7,8]. In the design of hydraulic lifting and rotating system lifting mechanical transmission control, many scholars have studied it and achieved good results.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Lifting and Rotating System Lifting Machinery Transmission Control Design

Chen

2022

Mobile Information Systems

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With the continuous improvement of the level of intelligence in the construction machinery industry, as one of the core technologies in the hydraulic lifting and rotating system, the lifting transmission control system has become a key factor in determining the performance of the elevator. As a hydraulic lifting machine with high protection level and powerful functions, the mechanical transmission controller has been recognized by the market. This study is based on the design of lifting machinery transmission control of hydraulic lifting and rotating system and studies the lifting mechanism transmission system in the hydraulic lifting and rotating system required for engineering operation. According to the functional characteristics of the transmission controller of the lifting mechanism, the control system scheme is designed. On this basis, the system design of the lift machinery transmission control and, according to this design, the functions of driving speed control and transmission mode switching are studied. Starting from the movement mechanism of hydraulic continuous lifting technology, this research carried out the principle design of mechanical transmission control, related calculations, selection of hydraulic components, corresponding simulations, structural design of mechanical transmission, and tests of hydraulic power systems. Finally, the control system was verified through simulation experiments, and technical difficulties such as the liquid supply mode of the large-flow system, the selection of standby working conditions, and the reliability and safety design were solved. It can be seen from the simulation results that, as the displacement ratio increases, the system efficiency increases, reaching more than 70%. When the valve opening reaches 20° when the valve port is closed, the efficiency of the power control valve reaches 95%. It can be seen that the control system established in this study has more advantages in power and economy. The transmission control system of hoisting machinery designed in this study can give greater play to its transmission efficiency and significantly reduce the working time and intensity of the operator.

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Section: Introductionmentioning

confidence: 99%

Hydraulic Lifting and Rotating System Lifting Machinery Transmission Control Design

Chen

2022

Mobile Information Systems

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“…During the circulation of a geothermal fluid or hydraulic stimulation, the chemical composition of the fluid changes abruptly compared to the initial stage. The composition changes originate from various geochemical reactions in the geothermal reservoir (Owen et al, 2020;Lee and Chung, 2020a). As described in the article by Pauwels et al (1992), the total dissolved solids (TDS) of the production fluid of the Soultz-sous-Forêts EGS increase due to a short duration injection test, and lithium ions especially are increased in this site.…”

Section: Introductionmentioning

confidence: 93%

“…EGSs apply hydraulic stimulation at depths deeper than 3 km of HDR to create an artificial geothermal reservoir for a sustainable geothermal system (Hofmann et al, 2014;Kim et al, 2018). Water is injected through an injection well where the thermal energy is stored in the deep fractured network, and it comes out through the pumping well with thermal energy (Caulk et al, 2016;Hofmann et al, 2019;Lee and Chung., 2020a). The heated water passes through a geothermal heat exchanger where the heat is used to generate electricity.…”

Section: Introductionmentioning

confidence: 99%

“…A high concentration of silicate ions (130-409 mg/L) was reported for the GPK-2 production well of the Soultz-sous-Forêts EGS on different sampling dates (Sanjuan et al, 2006). Due to a high concentration of silicate ions dissolved in the fluid, the precipitation of silicate minerals can occur in the pipe or reservoir during the circulation of the fluid, so fracture closure can decrease the permeability of the EGS (Sanjuan et al, 2010;Putera et al, 2018;Lee and Chung, 2020a). Not only is dissolved silicate fatal for the EGS process due to the scaling formation, high concentrations of dissolved silicate ions also have been reported to possibly inhibit the extraction efficiency of metal ions (Hano et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Silicate Ions on the Separation of Lithium From Geothermal Fluid

Lee

Chung

2022

Front. Chem. Eng.

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In an enhanced geothermal system (EGS), geothermal energy in rocks with insufficient permeability or fluid saturation can be used by creating artificial geothermal reservoirs. Generally, EGS geothermal fluid contains high concentrations of total dissolved solids that originated from various geochemical reactions between the fluid in the reservoir and the minerals in the rock. For example, the concentration of lithium ions are measured approximately 150 mg/L, and several researchers have focused on the recovery of lithium in the geothermal fluid using various methods, one of which is liquid extraction. Solvent extraction has been used to recover lithium from various sources, and successful recovery efficiency have been attained. However, the geothermal fluid in EGS reservoirs contains high concentrations of SiO2, which might inhibit the selective recovery of lithium. Thus, in this study, two consecutive stages of solvent extraction were used to separate the lithium from the geothermal fluid that contained different concentrations of SiO2 ions. The divalent ions were removed in the first stage, and the lithium ions were extracted effectively in the second stage. The SiO2 inhibits the selective recovery of lithium in the first stage to a greater extent than it does in the second stage. The spectroscopy data shows a decrease of the organic solvents main functional group (P=O & P-O-H) absorbance that reacts with the metal ions of the geothermal water after extraction however the intensity difference was reduced as the SiO2 concentrations increases. Silicate ions can be problematic due to the formation of scaling in EGSs, so controlling its concentration in the geothermal reservoir would be beneficial for the long-term operation of EGSs and for the successful recovery of valuable metal resources from EGS reservoirs.

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“…EGS는 투수성이 낮은 기반암에서 열을 생산 해 낼 수 있도록 수압파쇄 또는 수리자극을 이용해 암반 내 에 균열을 만들어 생성한 인공저류층을 이용하며 (Gallup, 2009), 온도가 낮은 물이 인공저류층 내에서 지열에너지에 의해 가열된 후 양수 되어 전기발전에 이용된다. 지상으로 양수된 가열된 물은 열 교환기를 거쳐서 증기터빈을 이용 하여 전기를 생산한다 (Jiang et al, 2016;Lee and Chung, 2020). 대표적으로 낮은 투수성을 가진 기반암은 화강암으 로 (Chandrasekharam et al, 2015) (Carlson et al, 2018;Nouraliee, 2000) (Scherff, 2016;Cladouhos et al, 2016 (Bae et al, 2017;Park et al, 2013) 공급하는 지열발전소로서 수십 년 동안 가동되어 왔다 (Sahar et al, 2010;Mutonga, 2007 Caulk et al, 2016;Luo et al, 2018).…”

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Geochemical Effect of Geothermal Water Flushing during Enhanced Geothermal Systems Operation

Lee¹,

Chung²

2021

ksmer

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Scale production occurs during enhanced geothermal system (EGS) processes due to various conditions. The production of scales in pipes or fractured reservoir narrows the diameter of the injection and production well, decreasing permeability and reducing EGS efficiency. However, geothermal water flushing during EGS processes can be implemented to recover the permeability. In this study, an experimental instrument to simulate a geothermal system was applied to observe the chemical composition change of core and water samples. To simulate the EGS, an experiment was conducted by injecting the geothermal fluid in several cycles to the fractured core. Results showed that Si ions decreased in the geothermal fluid and permeability decreased due to precipitation. Thereafter, flushing was applied, and dissolution occurred inside the fracture, increasing the permeability.

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Application of geochemical modelling for hydraulic stimulation in enhanced geothermal systems

Cited by 6 publications

References 15 publications

Hydraulic Lifting and Rotating System Lifting Machinery Transmission Control Design

Hydraulic Lifting and Rotating System Lifting Machinery Transmission Control Design

The Effect of Silicate Ions on the Separation of Lithium From Geothermal Fluid

Geochemical Effect of Geothermal Water Flushing during Enhanced Geothermal Systems Operation

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