Modeling steam flow in an injection tubing and analysis of flow regimes for high pressure-high temperature initial parameters

Yusupov, R. R.; Meretskaya, E.; Eskin, Dmitry

doi:10.1016/j.cep.2020.108168

Cited by 2 publications

(3 citation statements)

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“…Steam injection has been extensively developed as a fundamental thermal recovery method [40]. This provides a framework for the design of EEOR well structures for enhanced performance.…”

Section: B Conceptual Well Structure For Rf-emhmentioning

confidence: 99%

“…(z) = V + o e −jβz+ ρ L e jβz (A 40). with the reflection coefficient expressed in polar form ρ L = |ρ L | e jθ , the voltage in the line can be written as:V (z) = V + o e −jβz 1 + |ρ L | e 2jβz+jθ (A.41)from which it follows that:|V (z)| 2 = V + |ρ L | 2 2 |ρ L | cos (2βz + θ) (A.42) Equation A.42 indicates that the amplitude is a maximum V max = V + o [1 + |ρ L |] and a minimum V min = V + o [1 − |ρ L |]at planes separated by λ/4, and the ratio between the maximum and minimum voltage in the line, known as voltage standing wave ratio, is given by:SWR = 1 + |ρ L | 1 − |ρ L | (A.43) …”

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confidence: 99%

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Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

2023

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This paper presents the numerical modelling and simulation of a 2D vertical well tubular model excited by a coaxial radiofrequency transmission line placed in its annular space for the purpose of downhole RF energy transmission. The study identifies the mechanism of energy losses due to coupling between the transmission line and steel tubing and casing using resonance mode analysis. The design of a left-handed artificial power line is proposed to minimize the losses due to the right-handed properties of the coaxial transmission line. The design utilizes ideal lumped element method to determine the left-handedness of the right-handed coaxial transmission line over the industrial heating radio-frequency band. The model is developed and simulated using COMSOL multi-physics commercial simulation software. The effect of transmission line position within the annular space on the tangential magnetic field and resulting power losses along the tubing is discussed. It is observed that the resulting artificial power line improves RF power transmission over 60 m depths of the vertical oil well within the industrial heating radiofrequency band.

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“…Steam injection has been extensively developed as a fundamental thermal recovery method [40]. This provides a framework for the design of EEOR well structures for enhanced performance.…”

Section: B Conceptual Well Structure For Rf-emhmentioning

confidence: 99%

mentioning

confidence: 99%

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

2023

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“…A major concern of heating agent injection into oil shale reservoir is related to heat losses to surrounding formation. However, recently, it was shown numerically that in high pressure and high temperature conditions, initial steam quality, fluid flow rate, and insulation's thermal conductivity are vital parameters influencing the further water phase state along the tubing [29]. Hydrostatic and frictional pressure gradients are significant contributors to changes in thermodynamic properties and temperature profile along the well.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Subcritical Water Injection into Bazhenov Oil Shale: Geochemical and Petrophysical Properties Evolution Due to Hydrothermal Exposure

et al. 2021

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In situ shale or kerogen oil production is a promising approach to developing vast oil shale resources and increasing world energy demand. In this study, cyclic subcritical water injection in oil shale was investigated in laboratory conditions as a method for in situ oil shale retorting. Fifteen non-extracted oil shale samples from Bazhenov Formation in Russia (98 °C and 23.5 MPa reservoir conditions) were hydrothermally treated at 350 °C and in a 25 MPa semi-open system during 50 h in the cyclic regime. The influence of the artificial maturation on geochemical parameters, elastic and microstructural properties was studied. Rock-Eval pyrolysis of non-extracted and extracted oil shale samples before and after hydrothermal exposure and SARA analysis were employed to analyze bitumen and kerogen transformation to mobile hydrocarbons and immobile char. X-ray computed microtomography (XMT) was performed to characterize the microstructural properties of pore space. The results demonstrated significant porosity, specific pore surface area increase, and the appearance of microfractures in organic-rich layers. Acoustic measurements were carried out to estimate the alteration of elastic properties due to hydrothermal treatment. Both Young’s modulus and Poisson’s ratio decreased due to kerogen transformation to heavy oil and bitumen, which remain trapped before further oil and gas generation, and expulsion occurs. Ultimately, a developed kinetic model was applied to match kerogen and bitumen transformation with liquid and gas hydrocarbons production. The nonlinear least-squares optimization problem was solved during the integration of the system of differential equations to match produced hydrocarbons with pyrolysis derived kerogen and bitumen decomposition.

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Modeling steam flow in an injection tubing and analysis of flow regimes for high pressure-high temperature initial parameters

Cited by 2 publications

References 12 publications

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

Cyclic Subcritical Water Injection into Bazhenov Oil Shale: Geochemical and Petrophysical Properties Evolution Due to Hydrothermal Exposure

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