A coupled thermal-hydraulic-mechanical modeling and evaluation of geothermal extraction in the enhanced geothermal system based on analytic hierarchy process and fuzzy comprehensive evaluation

Guo, Tiankui; Tang, Songjun; Sun, Jiang; Gong, Facheng; Liu, Xiaoqiang; Qu, Zhanqing; Zhang, Wei

doi:10.1016/j.apenergy.2019.113981

Cited by 127 publications

(25 citation statements)

References 36 publications

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“…while the evaluation index weight is determined by the analytic hierarchy process. The analytic hierarchy process is a structured technique for organizing and analyzing complex decisions, based on mathematics and psychology (Guo et al 2020;Wang and Duan 2019). It decomposes the elements related to decision-making into levels such as goals, criteria and plans and then performs qualitative and quantitative analysis on this basis (Guo et al 2016a, b;Hu et al 2018).…”

Section: Risk Assessment Methodsmentioning

confidence: 99%

“…The first-tiered indices include corrosion rate (U1) and residual strength (U2), while the second-tiered indices include temperature (V1), CO 2 partial pressure (V2), flow velocity (V3), corrosion depth (V4), corrosion radius (V5) and wellhead pressure (V6). Then, judgment matrices are constituted by pairwise comparison according to Saaty 1-9 scales shown in Table 4 (Guo et al 2020;Gao et al 2010). On the basis of experts' experience, corrosion tests and numerical simulation results, the judgment matrices of first-tiered index (A) and second-tiered index (B1, B2) are shown in Tables 5, 6 and 7.…”

Section: Determination Of Evaluation Index Weightmentioning

confidence: 99%

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Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

et al. 2020

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Casing corrosion during CO2 injection or storage results in significant economic loss and increased production risks. Therefore, in this paper, a corroded casing risk assessment model based on analytic hierarchy process and fuzzy comprehensive evaluation is established to identify potential risks in time. First, the corrosion rate and residual strength characteristics are analyzed through corrosion tests and numerical simulations, respectively, to determine the risk factors that may lead to an accident. Then, an index system for corroded casing risk evaluation is established based on six important factors: temperature, CO2 partial pressure, flow velocity, corrosion radius, corrosion depth and wellhead pressure. Subsequently, the index weights are calculated via the analytic hierarchy process. Finally, the risk level of corroded casing is obtained via the fuzzy comprehensive evaluation. The corroded casing risk assessment model has been verified by a case well, which shows that the model is valuable and feasible. It provides an effective decision-making method for the risk evaluation of corroded casing in CO2 injection well, which is conductive to improve the wellbore operation efficiency.

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Section: Risk Assessment Methodsmentioning

confidence: 99%

Section: Determination Of Evaluation Index Weightmentioning

confidence: 99%

Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

et al. 2020

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“…The hot fluid is abstracted from the abstraction well; then the cold fluid is re-injected into the subsurface to form the circulation. Two main criteria need to be addressed when designing an EGS (Kaya et al, 2011;Rivera et al, 2015;Figueiredo et al, 2020): (1) temperature at the abstraction well: if the temperature decreases quickly during the operation, the lifetime of the EGS will be much restricted; (2) the pore pressure difference between wells of injection and abstraction; if the pressure difference is too large, the EGS will not be cost-effective, i.e., the cost of injection and abstraction will be too high. Therefore, these two criteria are investigated in our study.…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydro-mechanical modelling study of heat extraction and flow processes in enhanced geothermal systems

Zhou¹,

Tatomir

Sauter³

2021

Adv. Geosci.

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Abstract. Enhanced Geothermal Systems (EGS) are widely used in the development and application of geothermal energy production. They usually consist of two deep boreholes (well doublet) circulation systems, with hot water being abstracted, passed through a heat exchanger, and reinjected into the geothermal reservoir. Recently, simple analytical solutions have been proposed to estimate water pressure at the abstraction borehole. Nevertheless, these methods do not consider the influence of complex geometrical fracture patterns and the effects of the coupled thermal and mechanical processes. In this study, we implemented a coupled thermo-hydro-mechanical (THM) model to simulate the processes of heat extraction, reservoir deformation, and groundwater flow in the fractured rock reservoir. The THM model is validated with analytical solutions and existing published results. The results from the systems of single fracture zone and multi-fracture zones are investigated and compared. It shows that the growth of the number and spacing of fracture zones can effectively decrease the pore pressure difference between injection and abstraction wells; it also increases the production temperature at the abstraction, the service life-spans, and heat production rate of the geothermal reservoirs. Furthermore, the sensitivity analysis on the flow rate is also implemented. It is observed that a larger flow rate leads to a higher abstraction temperature and heat production rate at the end of the simulation, but the pressure difference may become lower.

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“…e fuzzy comprehensive evaluation method has been well applied in many fields [15,16]; however, it is less involved in the field of mineral crushing. In this study, the fuzzy comprehensive evaluation system, which is based on the analytic hierarchy process, was introduced into the field of ultrafine grinding; comprehensive indicators were used to optimize the ultrafine grinding process of mineral powders.…”

Section: Introductionmentioning

confidence: 99%

Parameter Optimization of Ultrafine Comminution Based on Analytic Hierarchy Process: Fuzzy Comprehensive Evaluation

Zhu

Liu

et al. 2021

Journal of Control Science and Engineering

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This paper proposes a fuzzy comprehensive evaluation of ultrafine powders, namely, yield and quality value-based feature selection. Three indicators reflecting product yield and quality were selected to construct a simple and practical fuzzy comprehensive evaluation protocol. The weight set of the indices and the fuzzy evaluation set were calculated based on the analytic hierarchy process (AHP) method. The fuzzy comprehensive evaluation value was worked out as the only comprehensive index for the evaluation of product. The best ultrafine comminution condition will be established through the comparison of the fuzzy comprehensive evaluation values. Single-factor experiments and orthogonal experiments of the main influencing factors of ultrafine comminution were conducted. It was concluded that the importance of each factor is sequentially the concentration, specific surface area (SSA) of the media, and percentage of critical speed (PCS). Moreover, the concentration and SSA of the media were equally important. Ultrafine comminution by ball mill had the best overall performance under the PCS of 85%, the SSA of the media of 0.24 m2/kg, and the concentration of 75%.

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A coupled thermal-hydraulic-mechanical modeling and evaluation of geothermal extraction in the enhanced geothermal system based on analytic hierarchy process and fuzzy comprehensive evaluation

Cited by 127 publications

References 36 publications

Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

Thermo-hydro-mechanical modelling study of heat extraction and flow processes in enhanced geothermal systems

Parameter Optimization of Ultrafine Comminution Based on Analytic Hierarchy Process: Fuzzy Comprehensive Evaluation

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