Predicting initial formation temperature for deep well engineering with a new method

Zhou, Fuzong; Xiong, Yucheng; Tian, Ming Xing

doi:10.1007/s12583-015-0512-4

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Among these factors, the most significant is the temperature of the rocks surrounding the well. It is known that the temperature of rocks increases with depth in accordance with the value of the geothermal gradient, which is largely determined by specific geological conditions (Zhou, Xiong, & Tian, 2015;Sevillano, De Andrade, & Sangesland, 2017). Most models used in practice assume a linear dependence of the rock temperature distribution on depth.…”

Section: A Short Profile Of the State Of The Artmentioning

confidence: 99%

Modelling of deep wells thermal modes

Bulat¹,

Blyuss²,

Dreus³

et al. 2019

Min. miner. depos.

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Purpose. Investigation of various heat-exchange conditions influence of the tower liquid on the deep wells thermal conditions.Methods. Methods of heat-exchange processes mathematical modeling are used. On the basis of the developed scheme for calculation, the thermal condition in a vertical well with a concentric arrangement of the drill-string was investigated. It was assumed that the walls of the well are properly insulated, and there is no flow or loss of fluid. The temperature distribution in the Newtonian (water) and non-Newtonian (clay mud) liquid along the borehole was simulated taking into account changes in the temperature regime of rocks with depth. To verify the calculation method and determine the reliability of the results, a comparative analysis of the calculated and experimental data to determine the temperature of the drilling liquid in the well was performed. Findings.A mathematical model for the study of temperature fields along the well depth was proposed and verified. A steady-state temperature distribution along the borehole is obtained for various types (Newtonian or non-Newtonian) tower liquid, with a linear law of change in rocks temperature with depth. It has been established that the temperature of the liquid flow at the face of hole and at the exit to the surface depends on the type of liquid used and the flow regime. It has been established that due to thermal insulation of drill pipe columns, heat-exchange between the downward and upward flow is reduced, which leads to a decrease in the temperature of the downward flow at the face of hole, providing a more favorable temperature at the face, which contributes to better destruction of the rock and cooling the tool during drilling.Originality. The nature of temperature distribution and changes along the borehole under the steady-state mode of heat-exchange in a turbulent and structural flow regime for both Newtonian and non-Newtonian circulating liquid are revealed. Practical implications.The proposed mathematical model and obtained results can be used to conduct estimates of the thermal conditions of wells and the development of recommendations for controlling the intensity of heatexchange processes in the well, in accordance with the requirements of a specific technology.

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Section: A Short Profile Of the State Of The Artmentioning

confidence: 99%

Modelling of deep wells thermal modes

Bulat¹,

Blyuss²,

Dreus³

et al. 2019

Min. miner. depos.

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“…However, due to the traffic and construction conditions in remote plateaus and mountainous areas, the traditional drilling and geophysical exploration methods are often difficult to carry out. Therefore, in the tunnel survey stage, obtaining a relatively accurate prediction and classification of the heat damage of the tunnel based on the temperature of the surrounding rock has become an engineering problem [10,15,16]. In an area that cannot be completely assessed by drilling and geophysical exploration, other means, such as numerical simulation and theoretical speculation, must be utilized when predicting the tunnel heat damage based on limited data.…”

Section: Introductionmentioning

confidence: 99%

Monitoring and Analysis of Geotemperature during the Tunnel Construction

Wen

Wang

et al. 2022

Energies

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High geotemperatures are encountered during tunnel construction in areas with complex geological structures, which can seriously affect personnel and equipment in the process of tunnel construction and operation. The Nige tunnel, a deep-buried extra-long tunnel, was selected to monitor the geotemperature during construction. The air, rock, and water temperatures during the tunnel construction were measured at the tunnel face, and the actual temperatures of the rock or water body at the tunnel face were measured by advanced drilling. The variation trends of the water temperature, air temperature, and flow of water with the tunnel mileage were analyzed. The differences in three measured rock temperatures in three advanced drillings were revealed. The results showed that the Nige tunnel had a maximum water temperature of 63.4 °C, maximum rock temperature (Rock T) of 88.8 °C, and maximum air temperature (Air T) of 56.4 °C. Increasing trends of the air, rock, and water temperatures with the tunnel’s horizontal distance and the buried depth (vertical depth) were obvious, and the geotemperature gradient was approximately 7.6 °C per 100 m. Additionally, the variation laws of the construction ambient temperature with time in a complete construction cycle showed four stage characteristics, and each stage presented different mathematical relationships. These findings will provide guidance for the construction of high geotemperature tunnels in future.

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“…In order to estimate the SFT using BHTs and shut-in times, we find numerous analytical methods (i.e. Horner, 1951;Ascencio et al, 1994;Hassan and Kabir, 1994;Kutasov and Eppelbaum, 2005;Zhou et 2015) and simulators (i.e. Beirute, 1991;García et al, 1998;Porkhial et al, 2015).…”

Section: Introductionmentioning

confidence: 99%