Improved analysis of transient temperature data from permanent down-hole gauges (PDGs)

Zhang, Yiqun; Zheng, Shi-Yi; Wang, Qi

doi:10.1088/1742-2140/aa66da

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Some researchers have attempted to utilize transient temperature responses as an auxiliary source of information for verification of PTA results. Zhang et al [ 20 ] used wavelet transforms to identify flow regimes and transient periods in well tests. They also used TTA to verify the results of buildup test obtained by conventional isothermal interpretation methods.…”

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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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.

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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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“…Several authors have reported large temperature changes in oil, gas, and geothermal wells as large as 21 C due to the large pressure drop. [1][2][3][4][5] Hawkes et al [6] showed several field examples of cooling effects in the reservoir and wellbore in Western Canada. The magnitude of temperature decline was so large that it adversely affected the quality of well test execution and analysis.…”

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confidence: 99%

An efficient numerical model for nonisothermal fluid flow through porous media

Dastkhan

Kazemi

2021

Can J Chem Eng

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Temperature transient analysis has gained increasing attention in recent years due to the widespread application of downhole temperature sensors with high resolution and accuracy. With the fast, high resolution, and accurate temperature sensors in oil and gas wells, there is a need for the models and methods for analysis of transient temperature data in order to identify production and well completion problems and calculation of reservoir properties. Although

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Fluid and rock heterogeneity assessment of gas condensate reservoirs by wavelet transform of pressure-transient responses

Faramarzi

Sadeghnejad

2020

Journal of Natural Gas Science and Engineering

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Improved analysis of transient temperature data from permanent down-hole gauges (PDGs)

Cited by 4 publications

References 25 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

An efficient numerical model for nonisothermal fluid flow through porous media

Fluid and rock heterogeneity assessment of gas condensate reservoirs by wavelet transform of pressure-transient responses

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