Calculation of the wellbore temperature and pressure distribution during supercritical CO2 fracturing flowback process

Wang, Haizhu; Li, Xiaojiang; Sepehrnoori, Kamy; Zheng, Yong; Yan, Wanjuan

doi:10.1016/j.ijheatmasstransfer.2019.04.109

Cited by 29 publications

(18 citation statements)

References 17 publications

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“…where Aw is the wellbore surface area (m 2 ), I k is the thermal conductivity of Zone I (W/(m.K)), r is the radius (m). It should be noted that various structures and geometries for wellbores exist [75,105,106], and the wellbore structure proposed in the present work is assumed as a general model based on previous works [73,74,81,107].…”

Section: Methodsmentioning

confidence: 99%

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Roostaie

Leonenko

2020

Energy Conversion and Management

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In this study, a radial 2D analytical approach has been developed to couple the wellbore heating process and the associated methane hydrate dissociation in the reservoir. A coaxial wellbore is assumed as the heat source where both conduction and convection heat transfers are considered. It consists of an inner tube and an outer structure of casing, gravel, and cement layers. In the reservoir, a similarity solution employing a moving boundary separating the dissociated and undissociated zones is employed to build the analytical solution. Two different operating schemes for water supply into wellbore heat source have been studied: i) from the inner tube; and ii) from the annulus section of the wellbore. Temperature distribution along the wellbore, temperature and pressure distributions in the reservoir, hydrate dissociation rate, and energy efficiency considering various initial and boundary conditions and reservoir properties are evaluated. The two different operating schemes have almost the same results with slightly higher gas production in the case of hot water entry into annulus, which is in direct contact with the reservoir. Increasing the inlet water temperature or decreasing the wellbore pressure increases gas production. Applying them simultaneously results in a greater gas production and energy efficiency. Some of the reservoir's properties, such as porosity, thermal diffusivity, thermal conductivity, and reservoir thickness, have direct relation with the dissociation rate, but the reservoir's permeability and gas viscosity have almost no impact on the process. The wellbore parameters, such as flow rate of hot water, inlet temperature, and wellbore radius except the inner tube radius, have direct impact on the wellbore mean temperature and the associated results in the dissociation process.

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Section: Methodsmentioning

confidence: 99%

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Roostaie

Leonenko

2020

Energy Conversion and Management

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“…The physical properties of SC-CO 2 is sensitive to the pressure and temperature that are related to the CO 2 injection, injection pressure and temperature, depth of the well, and the roughness of the well surface. 360,361 The change of physical properties will directly affect the drilling ability of SC-CO 2 . Some researchers have investigated the SC-CO 2 flow by simplified models.…”

Section: Microscale Variationsmentioning

confidence: 99%

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Lyu

Tan

et al. 2021

Energy Environ. Sci.

108

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“…The dashed circle shows the moving dissociation boundary, and the grey region denotes the wellbore thickness consisting of a cement, gravel, and two layers of casing ( Figure 1). It should be noted that there are many different wellbore structures and geometries in the literature [53][54][55], and the proposed wellbore structure in this study is taken as the general wellbore model as understood to the best of our knowledge [56][57][58][59].…”

Section: • Modelingmentioning

confidence: 99%

Section: • Modelingmentioning

confidence: 99%

Gas production from methane hydrates upon thermal stimulation; an analytical study employing radial coordinates

Roostaie

Leonenko

2020

Energy

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In this study, a radial analytical model for methane hydrate dissociation upon thermal stimulation in porous media considering the effect of wellbore structure has been developed. The analytical approach is based on a similarity solution employing a moving boundary separating the dissociated and undissociated zones. Two different heat sources are considered: i) line heat source; and ii) wellbore heat source with specific thickness consisting of casing, gravel, and cement. The temperature and pressure distributions, dissociation rate, and energy efficiency considering various initial and boundary conditions, and reservoir properties are investigated. Direct heat transfer from the heat source to the reservoir without considering the heat conduction in the wellbore thickness causes higher the dissociation rate and gas production in the line heat source model compared to the wellbore heating model. Increasing the heat source temperature or decreasing its pressure increases gas production. However, employing them simultaneously results in greater gas production but reduces energy efficiency. The dissociation rate has direct relation with porosity, thermal diffusivities, and thermal conductivities of the reservoir, but is not dependent on the reservoir's permeability.

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Calculation of the wellbore temperature and pressure distribution during supercritical CO2 fracturing flowback process

Cited by 29 publications

References 17 publications

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Gas production from methane hydrates upon thermal stimulation; an analytical study employing radial coordinates

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