Unsteady model for wellbore pressure transmission of carbon dioxide fracturing considering limited-flow outlet

Xiao, Chunyan; Ni, Hongjian; Shi, Xian

doi:10.1016/j.energy.2021.122289

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…where xy  denotes the deviatoric stress (Pa), which is closely related to flow pressure loss. The friction factor  (dimensionless) of xy  is typically used to replace effects caused by fluid viscosity, turbulent disturbances, and pipe characteristics [44,45]. Combining  with the definition for the pressure head, the final fluid momentum equation is expressed as…”

Section: Momentum Equation Of Fluidmentioning

confidence: 99%

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A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

Deng,

Yi,

et al. 2024

Preprint

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Diagnostic technique for hydraulic fracture based on the water-hammer pressure have been gradually highlighted owing to their cost effectiveness and simplicity. The present diagnostic models overlook the effects of fluid leak-off and natural fracture, and it is limited in naturally fractured reservoir. In this study, the location and number of hydraulic fractures are first obtained through the enhancement and cepstrum processing of a water-hammer signal. Subsequently, the water-hammer pressure within the wellbore is calculated by solving the continuity and momentum equations for the fluid. Wellbore and hydraulic fractures are considered as a hydraulic system. To estimate the fracture dimension, flow boundary conditions are imposed to the fluid leak-off, interactions between natural and hydraulic fractures, and multifracture stress shadows. Based on the results, (1) the fracturing shut-in method can be appropriately adjusted to avoid large pressure pulsations, which damage well integrity, and to obtain a clear water-hammer signal for fracture diagnosis. (2) As the perforation cluster spacing increases, the fractures on both sides first decrease and then increase, whereas the centre fracture increases consistently. (3) Natural fractures reduce the hydraulic fracture dimensions but facilitate the creation of complex fracture networks; however, this complexity cannot be increased indefinitely. (4) The minimum horizontal stress decreases the fracture dimension and a greater difference in the horizontal stress renders it easier for hydraulic fractures to cross natural fractures to create larger dimensions. (5) The field study demonstrates the practicality of our model, and optimisation measures can be recommended based on the diagnostic results.

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Section: Momentum Equation Of Fluidmentioning

confidence: 99%

“…The length of each hydraulic fracture is assumed to be known, as it is required for calculating the average net pressure using Eq. (44). Once the value of , fn W is established, it can be substituted into Eq.…”

mentioning

confidence: 99%

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

Deng,

Yi,

et al. 2024

Preprint

View full text Add to dashboard Cite

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“…Furthermore, a fully connected neural network (FCN) model was devised for predicting EGS production temperatures. Xiao et al 19 developed a dynamic model for transient flow of CO 2 in wellbores by integrating compressible fluid's momentum equation with nonlinear parameters specific to CO 2 . This model successfully simulated the relationship between wellbore pressure and nonlinear characteristics of CO 2 during injection processes while maintaining a high level of consistency with field data.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of enhanced geothermal systems with supercritical CO₂ injection considering reservoir changes

Xiao,

Li,

Gong

et al. 2024

Energy Science & Engineering

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The injection of supercritical CO2 (ScCO2) into the enhanced geothermal systems (EGS) is a highly intricate thermohydromechanical (THM) coupled process. To improve the realism and accuracy of simulating convective heat transfer characteristics in CO2‐EGS, a coupled model based on discrete fracture network (DFN) theory is established. In this model, the dynamic evolution laws of reservoir porosity and permeability, as well as the nonlinear variations of thermophysical parameters for ScCO2 under the influences of temperature and pressure are considered. The validity of the numerical results was confirmed through a comparative analysis with the analytical solution. The result shows that the ScCO2 can rapidly extracts heat from both the fractures and the adjacent rock matrix. The heat of the rock matrix far away from the fractures cannot be compensated to the fractures immediately, resulting in the high temperature peak effect of the local rock matrix. The injection of ScCO2 can increase the porosity and permeability of reservoir, which is induced by the weakened thermal expansion effect of rock. The alteration of reservoir porosity and permeability also leads to the change of the flow characteristics of ScCO2. Additionally, the thermal parameters of ScCO2 changes with the temperature and pressure conditions of the reservoir. The change of flow rate and heat extraction rate of ScCO2 in EGS is dominated by the decrease of density, specific heat capacity, porosity, permeability, and thermal conductivity.

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Study on early seal failure of CO2-injected packer based on orthogonal experimental method

Zhang

Wang

et al. 2023

Alexandria Engineering Journal

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Unsteady model for wellbore pressure transmission of carbon dioxide fracturing considering limited-flow outlet

Cited by 9 publications

References 47 publications

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

Numerical study of enhanced geothermal systems with supercritical CO₂ injection considering reservoir changes

Study on early seal failure of CO2-injected packer based on orthogonal experimental method

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Unsteady model for wellbore pressure transmission of carbon dioxide fracturing considering limited-flow outlet

Cited by 9 publications

References 47 publications

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

A diagnostic model for hydraulic fracture in naturally fractured reservoir utilising water-hammer signal

Numerical study of enhanced geothermal systems with supercritical CO2 injection considering reservoir changes

Study on early seal failure of CO2-injected packer based on orthogonal experimental method

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Product

Resources

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Numerical study of enhanced geothermal systems with supercritical CO₂ injection considering reservoir changes