A feedback-based inverse heat transfer method to estimate unperturbed temperatures in wellbores

Espinosa-Paredes, Gilberto; Espinosa-Martínez, É.-G.

doi:10.1016/j.enconman.2008.08.017

Cited by 30 publications

(7 citation statements)

References 18 publications

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“…However, such numerical models (e.g. Espinosa-Paredes and Garcia-Gutierrez 2003;Espinosa-Paredes and Espinosa-Martínez 2009;Yang et al 2015;Wang et al 2019) require detailed information about the well (e.g. well geometry) and its drilling process (e.g.…”

Section: Existing Correction Methods For Log Temperaturesmentioning

confidence: 99%

A new method for correcting temperature log profiles in low-enthalpy plays

Schumacher

Moeck

2020

Geotherm Energy

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Temperature logs recorded shortly after drilling operations can be the only temperature information from deep wells. However, these measurements are still influenced by the thermal disturbance caused by drilling and therefore do not represent true rock temperatures. The magnitude of the thermal disturbance is dependent on many factors such as drilling time, logging procedure or mud temperature. However, often old well reports lack this crucial information so that conventional corrections on temperature logs cannot be performed. This impedes the re-evaluation of well data for new exploration purposes, e.g. for geothermal resources. This study presents a new method to correct log temperatures in low-enthalpy play types which only requires a knowledge of the final depth of the well as an input parameter. The method was developed and verified using existing well data from an intracratonic sedimentary basin, the eastern part of the North German Basin. It can be transferred to other basins with little or no adjustment.

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Section: Existing Correction Methods For Log Temperaturesmentioning

confidence: 99%

A new method for correcting temperature log profiles in low-enthalpy plays

Schumacher

Moeck

2020

Geotherm Energy

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“…In region 2 (drill string wall), the drill string wall temperature (T 2 ) is determined by the rate of heat exchange between the wall and flow down the drill string and up in the annulus, as well as the axial heat conduction in the drill string wall. In region 3 (annulus), fluid exits the drill string through the bit, enters the annulus at the bottom, then passes up the annulus and finally exits the annulus ( ) at the surface [31,34].…”

Section: Physical Modelmentioning

confidence: 99%

“…Numerical modeling has been widely recognized as an effective and less expensive method to investigate heat exchange processes in each region of a well. To obtain complete transient solutions for such cases, numerical approaches, coupled with a superior mathematical algorithm, have been extensively used to predict the wellbore temperature and estimate the initial formation temperature to apply different operating conditions [19,[31][32][33][34][35][36][37]. Emami-Meybodi et al using Laplace transform and finite Fourier cosine transform, developed a two-dimensional transient heat conduction model in the near wellbore region during the steam circulation stage.…”

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confidence: 99%

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Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

Yang

Zhang

Meng

et al. 2017

Applied Thermal Engineering

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Heat exchange efficiency between each region of the wellbore and formation systems is influenced by the high thermal conductivity of the drill string and casing, which further affects temperature distribution of the wellbore. Based on the energy conservation principle, the Modified Raymond), Simplified and Full-scale models were developed, which were solved by the fully implicit finite difference method. The results indicated that wellbore and formation temperatures were significantly influenced at the connection points between the drill collar and drill pipe, as well as the casing shoe. Apart from the near surface, little change was observed in temperature distribution in the cement section. In the open-hole section, the temperature rapidly decreased in the circulation stage and gradually increased in the shut-in stage. Most important, the simulated result from the full-scale model coincided with the measured field data better than the other numerical models. These findings not only confirm the effect of the drill string assembly and casing programs on the wellbore and formation temperature distribution, but also contribute to resource exploration, drilling safety and reduced drilling costs.

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“…Therefore, electric heating is the optimal method for oil shale development. There can be found papers in the literature, which deal with in-situ oil shale heater [5][6][7][8][9][10][11][12][13][14]. But to have more information, the current paper simulated the temperature distribution of in-situ oil shale electric heater and further analyzed the influencing factors.…”

Section: Introductionmentioning

confidence: 99%

Temperature Distribution Simulation and Optimization Design of Electric Heater for in-Situ Oil Shale Heating

Yang¹,

Xiaoqiao²,

Fansheng³

et al. 2014

Oil Shale

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Electric heating is the main method of exploiting oil shale and electric heater is the key part of the heating element. In this paper, the temperature distribution of the electric heater was simulated by the Partial Differential Equation (PDE) of MATLAB, and orthogonal experiment analysis was also carried out to investigate the effects of different factors on the temperature distribution of the heater. The results showed that materials with low density were helpful to improve heating efficiency, and heat production, density and heat capacity had a great effect on the temperature distribution of the heater. The temperature distribution of the heater increased significantly with increasing heat production and radius of the heater, while higher heat capacity always led to the lower overall temperature of the heater. In addition, axisymmetric U-tube and vacuum heating tube were chosen as the heater, being of optimized shape, while copper and stainless steel were determined to be the optimized heater materials.

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A feedback-based inverse heat transfer method to estimate unperturbed temperatures in wellbores

Cited by 30 publications

References 18 publications

A new method for correcting temperature log profiles in low-enthalpy plays

A new method for correcting temperature log profiles in low-enthalpy plays

Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

Temperature Distribution Simulation and Optimization Design of Electric Heater for in-Situ Oil Shale Heating

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