A numerical approach for obtaining type curves of superheated multi-component thermal fluid flow in concentric dual-tubing wells

Sun, Fengrui; Yao, Yuedong; Li, Xiangfang; Yu, Peimin; Zhao, Lin; Zhang, Yi

doi:10.1016/j.ijheatmasstransfer.2017.03.103

Cited by 100 publications

(30 citation statements)

References 61 publications

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“…The wellbore structure of CDTW with CO 2 injection coupled with SHS is shown in Fig. . Some key assumptions are: (a) the injection parameters at the wellhead are steady state; (b) the heat transfer rate from fluid in annuli to the outer wall of the cement sheath is steady state; (c) the heat transfer rate in formation is in a transient state; (d) the thermal parameters of the formation are independent of the well depth.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…There are no mass losses in the IJT; the mass balance equation can be expressed as:

\frac{d w_{i n}}{d z} = π r_{i n i}^{2} \frac{d (ρ_{i n} v_{i n})}{d z} = 0

where,

w_{i n}

denotes the density of the thermal fluid in the IJT, kg/s;

r_{i n i}

denotes the inner radius of the IJT, m;

ρ_{i n}

denotes the density of the thermal fluid in the IJT, kg/m 3 ;

v_{i n}

denotes the flow velocity of the thermal fluid in the IJT, m/s; and z denotes the well depth, m.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The total energy loss rate from the IJT to annuli should be equal to the total energy change of thermal fluid in the IJT . The energy balance equation can be expressed as:

\frac{d Q_{i n}}{d z} = - w_{i n} \frac{d h_{i n}}{d z} - w_{i n} \frac{d}{d z} (\frac{v_{i n}^{2}}{2}) + w_{i n} g cos θ

where

Q_{i n}

denotes the heat transfer rate from IJT to annuli, J/s;

h_{i n}

denotes the enthalpy of the thermal fluid in the IJT, J/kg; g denotes the gravitational acceleration, m/s 2 ; θ denotes the deviation angle of the wellbore from the vertical line, rad.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The impulse of the external force of thermal fluid in a unit cement is equal to the momentum change in the thermal fluid . The momentum balance equation can be expressed as:

\frac{d p_{i n}}{d z} = ρ_{i n} g cos θ - \frac{τ_{fin}}{π r_{i n i}^{2} d z} - \frac{d (ρ_{i n} v_{i n}^{2})}{d z}

where

p_{i n}

denotes the pressure of the thermal fluid in the IJT, and Pa;

τ_{fin}

denotes the shear stress in IJT, N.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…With consideration of the effect of friction loss on fluid and formation temperature, the energy balance equation of the thermal fluid flow in annuli can be expressed as:

\begin{matrix} true \\ right \frac{d Q_{a n}}{d z} - \frac{d Q_{i n}}{d z} & = & left - w_{a n} \frac{d h_{a n}}{d z} - w_{a n} \frac{d}{d z} ((), \frac{v_{a n}^{2}}{2}) \\ left + w_{a n} g prefixcos θ \end{matrix}

where,

Q_{a n}

denotes the heat conduction rate from annuli to formation, J/s; and

h_{a n}

denotes the density of the thermal fluid in annuli, J/kg.…”

Section: Mathematical Modelmentioning

confidence: 99%

See 4 more Smart Citations

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli

Sun

Yao

et al. 2018

Greenhouse Gases

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The injection of supercritical CO2 coupled with superheated steam (SHS) for heavy oil recovery can improve development efficiency. In order to help oil fields to improve the efficiency of CO2 and SHS utilization we must predict the thermophysical properties at well bottom. Based on the mass, energy, and momentum conservation equations, a non‐isothermal pipe‐flow model is established considering heat exchange between the integral joint tubing (IJT) and annuli. Coupled with the transient thermal conduction model in stratum and the S‐R‐K real gas model, a comprehensive model is established for the mixture flow in concentric dual‐tubing wells (CDTW). The model is solved by a numerical method and an iteration technique. The results show that: (a) the accuracy of the temperature profile calculation has been greatly improved compared with the previous model; (b) the heat‐carrying capacity per unit mass of the mixture and heating efficiency decrease with increasing supercritical CO2 content; (c) when a temperature difference exists between the IJT and annuli, a rapid flow of thermal energy exists inside the CDTW, which causes a significant temperature change near the wellbore, but the influence of temperature change on pressure profiles is negligible. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Mathematical Modelmentioning

confidence: 99%

“…There are no mass losses in the IJT; the mass balance equation can be expressed as:

\frac{d w_{i n}}{d z} = π r_{i n i}^{2} \frac{d (ρ_{i n} v_{i n})}{d z} = 0

where,

w_{i n}

denotes the density of the thermal fluid in the IJT, kg/s;

r_{i n i}

denotes the inner radius of the IJT, m;

ρ_{i n}

denotes the density of the thermal fluid in the IJT, kg/m 3 ;

v_{i n}

denotes the flow velocity of the thermal fluid in the IJT, m/s; and z denotes the well depth, m.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The total energy loss rate from the IJT to annuli should be equal to the total energy change of thermal fluid in the IJT . The energy balance equation can be expressed as:

\frac{d Q_{i n}}{d z} = - w_{i n} \frac{d h_{i n}}{d z} - w_{i n} \frac{d}{d z} (\frac{v_{i n}^{2}}{2}) + w_{i n} g cos θ

where

Q_{i n}

denotes the heat transfer rate from IJT to annuli, J/s;

h_{i n}

denotes the enthalpy of the thermal fluid in the IJT, J/kg; g denotes the gravitational acceleration, m/s 2 ; θ denotes the deviation angle of the wellbore from the vertical line, rad.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The impulse of the external force of thermal fluid in a unit cement is equal to the momentum change in the thermal fluid . The momentum balance equation can be expressed as:

\frac{d p_{i n}}{d z} = ρ_{i n} g cos θ - \frac{τ_{fin}}{π r_{i n i}^{2} d z} - \frac{d (ρ_{i n} v_{i n}^{2})}{d z}

where

p_{i n}

denotes the pressure of the thermal fluid in the IJT, and Pa;

τ_{fin}

denotes the shear stress in IJT, N.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…With consideration of the effect of friction loss on fluid and formation temperature, the energy balance equation of the thermal fluid flow in annuli can be expressed as:

\begin{matrix} true \\ right \frac{d Q_{a n}}{d z} - \frac{d Q_{i n}}{d z} & = & left - w_{a n} \frac{d h_{a n}}{d z} - w_{a n} \frac{d}{d z} ((), \frac{v_{a n}^{2}}{2}) \\ left + w_{a n} g prefixcos θ \end{matrix}

where,

Q_{a n}

denotes the heat conduction rate from annuli to formation, J/s; and

h_{a n}

denotes the density of the thermal fluid in annuli, J/kg.…”

Section: Mathematical Modelmentioning

confidence: 99%

See 3 more Smart Citations

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli

Sun

Yao

et al. 2018

Greenhouse Gases

Self Cite

View full text Add to dashboard Cite

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Performance analysis of a novel eco‐friendly internal combustion engine cycle

Gonca

Şahi̇n

2019

Int J Energy Res

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Summary The Miller cycle applications have been performed to diminish NOx released from internal combustion engines (ICEs), in recent years. The Miller cycle provides decreased compression ratio and enhanced expansion ratio; hereby, maximum in‐cylinder combustion temperatures diminish, and NOx formations slow down remarkably. Another less‐known method is Takemura cycle application, which provides heat addition into engine cylinder at constant combustion temperatures. In this study, a novel cycle including the Miller cycle and the Takemura cycle has been developed by using novel numerical models and computing methods with seven processes and a novel way to decrease NOx emissions at higher levels compared with the single applications of known cycles. A comprehensive performance examination of the proposed cycle engine in terms of performance characteristics such as effective power (EFP), effective power density (EFPD), exergy destruction (X), exergy efficiency (ε), and ecological coefficient of performance (ECOP) has been conducted. The impacts of engine operating and design parameters on the performance characteristics have been computationally examined. Furthermore, irreversibilities depending on incomplete combustion loss (INCL), exhaust output loss (EXOL), heat transfer loss (HTRL), and friction loss (FRL) have been considered in the performance simulations. The minimum exergy destruction and maximum performance specifications have been observed with 30 of the compression ratio. Maximum effective power values have been obtained at range between 1 and 1.2 of equivalence ratio. The optimum range for exergy efficiency is between 0.8 and 1 of equivalence ratio. Increasing engine speed has provided enhancing effective power. However, an optimum range has been found for the exergy efficiency that is interval of 3000 to 4000 rpm. The results obtained can be assessed by researchers studying on modeling of the engine systems and designs.

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An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

Fan

et al. 2019

Energy Science & Engineering

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As the accurate productivity prediction of cyclic steam stimulation with horizontal well (CSSHW) is essential for its effective utilization in heavy oil reservoirs, a novel integrated model for predicting productivity of CSSHW was proposed in this paper. Firstly, governing equations to predict thermophysical parameters of injected steam in the horizontal well were established. On the basis, the heating model for radius of hot fluid zone and steam zone were derived respectively according to a more realistic temperature distribution of formation. Then, coupled with heating model, the productivity prediction model was established according to the principle of equivalent percolation resistance. Then, comparisons have been made among the new model results, CMG STARS results, and measured data to verify its accuracy. Finally, after the new proposed model is validated, the effects of steam quality and injection rate on heating radius and oil production were analyzed in detail. The results indicate that the result of new model is in good agreement with that of CMG STARS and measured data, verifying the correctness of the model. In addition, the radius of hot fluid zone and steam zone both decreases with horizontal well length because of the heat losses as the steam flows along the horizontal wellbore. Influential factor analysis shows that high steam quality and steam injection rate can improve heating radius and cumulative oil production.

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A numerical approach for obtaining type curves of superheated multi-component thermal fluid flow in concentric dual-tubing wells

Cited by 100 publications

References 61 publications

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli

Performance analysis of a novel eco‐friendly internal combustion engine cycle

An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

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A numerical approach for obtaining type curves of superheated multi-component thermal fluid flow in concentric dual-tubing wells

Cited by 100 publications

References 61 publications

Exploitation of heavy oil by supercritical CO2: Effect analysis of supercritical CO2 on H2O at superheated state in integral joint tubing and annuli

Exploitation of heavy oil by supercritical CO2: Effect analysis of supercritical CO2 on H2O at superheated state in integral joint tubing and annuli

Performance analysis of a novel eco‐friendly internal combustion engine cycle

An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

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Product

Resources

About

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli

Exploitation of heavy oil by supercritical CO₂: Effect analysis of supercritical CO₂ on H₂O at superheated state in integral joint tubing and annuli