Numerical study of non-isothermal flow and wellbore heat transfer characteristics in CO2 fracturing

Lyu, Xinrun; Zhang, Shicheng; Ma, Xinfang; Wang, Fei; Mou, Jianye

doi:10.1016/j.energy.2018.05.126

Cited by 25 publications

(5 citation statements)

References 34 publications

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“…In the 1D + 1D transient fully coupled model, the continuity, momentum, and energy equations are coupled together through the interaction among pressure, temperature, and CO 2 physical properties to form a transient nonlinear system, which requires an iteration solving method. The Span-Wagner EoS [44], Fenghour model [45] and Vesovic model [46] are used here as the physical properties models, which are proven to be highly accurate [10,11]. Two iteration loops are set up during the solution process: the pressurespeed and temperature iterations.…”

Section: Solving Methodsmentioning

confidence: 99%

“…CO 2 fracturing can simultaneously avoid the above disadvantages and achieve the effects of carbon sequestration (CCS) [4,5] and gas recovery enhancement (EGR) [6][7][8][9], which is a potential alternative technology to the slick-water fracturing. Unlike the water-based fracturing fluid, the physical properties of CO 2 vary significantly with temperature and pressure [10,11], which can affect the sand-carrying capacity and the performance of the stimulation. Additionally, it is impractical to modify the CO 2 temperature during the fracturing process based on the temperature monitor data because of the expense and time consumed.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Lyu

Zhang

et al. 2021

Sustainability

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A novel model is established to predict the temperature field in the horizontal wellbore during CO2 fracturing. The pressure work and viscous dissipation are considered, and the transient energy, mass and momentum equations as well as the CO2 physical properties are solved fully coupled. The model passes the convergence test and is verified through a comparison using the COMSOL software. Then, a sensitivity analysis is performed to study the effects of the treating parameters. Results illustrate that the relationship between the injection rate and the stable bottom-hole temperature (hereinafter referred to as BHT) is non-monotonic, which is different from the hydraulic fracturing. The existence of the horizontal section will increase the BHT at 2 m3/min condition but reduce the BHT at 10 m3/min condition. The problem of high wellbore friction can be alleviated through tube size enhancement, and the ultimate injection rate allowed increased from 2.7 m3/min to 29.6 m3/min when the tube diameter increased from 50.3 mm to 100.3 mm. Additionally, the open-hole completion method of the horizontal section can increase the BHT to 2.7 °C but reduce the near formation temperature to 24.5 °C compared with the casing completion method.

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Section: Solving Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Lyu

Zhang

et al. 2021

Sustainability

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“…Laesecke and Muzny and Huber et al developed equations for calculating viscosity and thermal conductivity. The above calculation equations have been widely used and have high calculation accuracy. − Furthermore, it is assumed that the properties of water are stable. Assuming that the reservoirs and interlayers are homogeneous, the lateral permeability is 10 times that of vertical permeability, the flow of water and CO 2 obeys Darcy’s law, and hydrates will not be generated in the wellbore and the reservoir.…”

Section: Model Developmentmentioning

confidence: 99%

Influence of Reservoir Spatial Heterogeneity on a Multicoupling Process of CO₂Geological Storage

Gao,

Yang,

Shen

et al. 2023

Energy Fuels

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As a means of delaying climate change, injecting carbon dioxide (CO2) into geological structures can be an effective carbon capture, utilization, and storage (CCUS) strategy. All geological structures are naturally spatial heterogeneity, which can significantly affect fluid flow and heat transfer, thereby affecting CO2 storage. We modeled fluid flow and heat transfer in 12 CO2 storage scenarios with spatially heterogeneous reservoirs using a thermal-hydraulic-mechanical (THM) coupled model of a 3D wellbore-reservoir system. CO2 injectability and distribution uniformity were studied in relation to reservoir vertical heterogeneity and interlayers. The optimization method of engineering parameters is discussed. Positive rhythm reservoirs exhibit more uniform CO2 distribution laterally under gravity than reverse rhythm reservoirs. In high permeability ratio reservoirs, the low-temperature zone has a longer transfer distance and CO2 is more likely to be injected, but channeling is prone to occur. Reservoir porosity has little effect on reservoir CO2 injectability and temperature distribution. The interlayers will weaken the influence of gravity and reduce the CO2 injectability while providing additional storage volume. Injecting CO2 at a lower temperature and mass flow will increase injectability. The uniform distribution of CO2 laterals is most effectively improved by hydraulic fracturing. Using low thermal conductivity materials for the wellbore insulation to reduce heat replenishment from the surrounding formation is critical.

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“…During the injection period, the wellbore pressure profiles at any time were greater than the supercritical pressure. These high-pressure profiles mean that the phase state of CO 2 in the tubing is either a liquid state or supercritical state, according to the phase state map of CO 2 [25]. Then, the phase state of CO 2 must be determined by the temperature distributions.…”

Section: Case Study-a Fracturing Wellmentioning

confidence: 99%

“…The Span-Wagner state equation was used in their models to calculate CO 2 physical properties. Yi et al [21], Guo and Zeng [22], Gong et al [23], Wang et al [24], Lyu et al [25,26], Li et al [27], and Yang et al [28] proposed transient models to simulate CO 2 temperature and discussed the sensitivity of some key factors.…”

Section: Introductionmentioning

confidence: 99%

Modeling Transient Flow in CO2 Injection Wells by Considering the Phase Change

Wan¹,

Wang

Hou

et al. 2021

Processes

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A transient model to simulate the temperature and pressure in CO2 injection wells is proposed and solved using the finite difference method. The model couples the variability of CO2 properties and conservation laws. The maximum error between the simulated and measured results is 5.04%. The case study shows that the phase state is primarily controlled by the wellbore temperature. Increasing the injection temperature or decreasing the injection rate contributes to obtaining the supercritical state. The variability of density can be ignored when the injection rate is low, but for a high injection rate, ignoring this may cause considerable errors in pressure profiles.

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Numerical study of non-isothermal flow and wellbore heat transfer characteristics in CO2 fracturing

Cited by 25 publications

References 34 publications

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Influence of Reservoir Spatial Heterogeneity on a Multicoupling Process of CO₂Geological Storage

Modeling Transient Flow in CO2 Injection Wells by Considering the Phase Change

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Numerical study of non-isothermal flow and wellbore heat transfer characteristics in CO2 fracturing

Cited by 25 publications

References 34 publications

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

Influence of Reservoir Spatial Heterogeneity on a Multicoupling Process of CO2Geological Storage

Modeling Transient Flow in CO2 Injection Wells by Considering the Phase Change

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Influence of Reservoir Spatial Heterogeneity on a Multicoupling Process of CO₂Geological Storage