Numerical and analytical modelling of sandface temperature in a dry gas producing well

Dada, Akindolu Oluwakanyinsola; Muradov, Khafiz; Dadzie, S. Kokou; Davies, David Roland

doi:10.1016/j.jngse.2017.02.005

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…When the expansion is performed rapidly and the heat transfer to the surrounding media is small, the process can be considered as constant enthalpy (isenthalpic), which results in a temperature change in the fluid. The Joule-Thomson coefficient is the rate of change of temperature with respect to pressure, which can be derived by applying Maxwell's relations to a constant enthalpy process [3] :…”

Section: Introductionmentioning

confidence: 99%

“…When the expansion is performed rapidly and the heat transfer to the surrounding media is small, the process can be considered as constant enthalpy (isenthalpic), which results in a temperature change in the fluid. The Joule‐Thomson coefficient is the rate of change of temperature with respect to pressure, which can be derived by applying Maxwell's relations to a constant enthalpy process [ 3 ] :

μ_{JT} = \frac{italicβT - 1}{ρ C_{P}}

where β is the linear thermal expansion of the fluid, T is temperature, ρ is fluid density, and C p is the specific heat capacity of the fluid. Typical values of μ JT for natural gases can be as large as 4.8°C/MPa in conventional reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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The impact of isothermal flow assumption on accuracy of pressure transient analysis results

Dastkhan

Kazemi

2021

Can J Chem Eng

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Adiabatic expansion and viscous dissipation of fluid flow in porous media result in considerable heating or cooling of hydrocarbon fluids when pressure gradients are very large. Traditionally, fluid flow in porous media has been assumed isothermal in hydrocarbon reservoirs. While this assumption helps with simplifying the physics of fluid flow by neglecting the thermal effects, it imposes a dominant impact on fluid properties in situations where flow undergoes fast paced and abrupt changes in flow rate and or pressure. The analytical solutions of fluid flow for pressure transient analysis rely on the isothermal flow assumption. Since the variations of fluid properties are not accounted for in temperature fluctuations, there is an inherent error in standard methods of well test analysis. In this paper, the errors in pressure transient analysis as a consequence of the assumption of isothermal fluid flow are investigated. The magnitude of error is quantified as a function of flow rate and pressure drop. Error analysis shows that at higher flow rates, the thermal impacts are elevated such that the application of isothermal flow models becomes erroneous and invalid. It can be shown that oil well tests are more influenced by thermal effects compared to gas well tests in conventional dry gas reservoirs. This study highlights an important thermal impact that is often neglected and should be considered in the design, execution, and analysis stages of well testing. Also, it suggests that isothermal analytical models should be avoided for well test analysis with large flow rates.

show abstract

Section: Introductionmentioning

confidence: 99%

“…When the expansion is performed rapidly and the heat transfer to the surrounding media is small, the process can be considered as constant enthalpy (isenthalpic), which results in a temperature change in the fluid. The Joule‐Thomson coefficient is the rate of change of temperature with respect to pressure, which can be derived by applying Maxwell's relations to a constant enthalpy process [ 3 ] :

μ_{JT} = \frac{italicβT - 1}{ρ C_{P}}

Section: Introductionmentioning

confidence: 99%

The impact of isothermal flow assumption on accuracy of pressure transient analysis results

Dastkhan

Kazemi

2021

Can J Chem Eng

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“…[42][43][44] The group contribution method proposed by Yoneda et al is a widely-used approach to predict the thermodynamic properties for chemical equilibrium analysis. [45][46][47][48] Here we have applied a combination of experimental and theoretical investigations: analyzing the reaction routes by experiments and identifying the considerable side reactions by thermodynamics calculation, which is an effective and low-cost way to determine the routes for a complex reaction system. This work is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the reaction route and kinetics of 3‐methyl‐3‐penten‐2‐one synthesis for synthetic ketone fragrances

Peng

Kiss

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: 3-Methyl-3-penten-2-one (3M3P) is an indispensable raw material used for the synthesis of OTNE (octahydrotetramethyl acetophenone), a synthetic ketone fragrance known by commercial trade names, such as Iso E Super®, which is one of the most important ingredients in perfumes. This work is the first to unravel the reaction route and kinetics for the synthesis of 3M3P via the cross-aldol condensation of acetaldehyde with butanone, catalyzed by the heterogeneous acidic ion exchange resin (NKC-9). RESULTS: An effective method was developed to evaluate this complex reaction system: the reaction routes were determined experimentally from the product structures detected by Gas Chromatography Mass Spectrometry (GC-MS), and the significance of side reactions were evaluated by the Yoneda group contribution method. The major side reactions are the self-condensation of acetaldehyde (significant even under optimized reaction conditions) and the cross-aldol condensation of acetaldehyde with 3M3P (which could be effectively suppressed at high butanone-acetaldehyde molar ratio). The reaction kinetics was investigated at temperatures of 60-90°C, catalyst mass fraction of 5 to 15%, and molar ratio of 5-20. At optimized reaction conditions, the yield of 3M3P was up to 90.85%, which is 2.4 times higher than that for the classic homogeneous catalysts (yield <38%). CONCLUSION: Acidic ion exchange resin NKC-9 is a high-selective green catalyst for the cross-aldol condensation of acetaldehyde with butanone. Integrating experimental determination and thermomechanical analysis is an effective method to unravel the main reaction routes for a complex system.

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Dynamic Temperature Analysis Under Variable Rate and Pressure Conditions for Transient and Boundary Dominated Flow

Mao

Zeidouni

2019

Transp Porous Med

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Numerical and analytical modelling of sandface temperature in a dry gas producing well

Cited by 12 publications

References 9 publications

The impact of isothermal flow assumption on accuracy of pressure transient analysis results

The impact of isothermal flow assumption on accuracy of pressure transient analysis results

Unraveling the reaction route and kinetics of 3‐methyl‐3‐penten‐2‐one synthesis for synthetic ketone fragrances

Dynamic Temperature Analysis Under Variable Rate and Pressure Conditions for Transient and Boundary Dominated Flow

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