A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation
Accurate characterization of heat transfer in a wellbore during drilling, which includes fluid circulation, is important for wellbore stability analysis. In this work, a pseudo-3D model is developed to simultaneously calculate the heat exchange between the flowing fluid and the surrounding media (dr...
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| Format: | Article |
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MDPI AG
2017-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/11/1/42 |
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| author | Bisheng Wu Tianle Liu Xi Zhang Bailin Wu Robert G. Jeffrey Andrew P. Bunger |
| author_facet | Bisheng Wu Tianle Liu Xi Zhang Bailin Wu Robert G. Jeffrey Andrew P. Bunger |
| author_sort | Bisheng Wu |
| collection | DOAJ |
| description | Accurate characterization of heat transfer in a wellbore during drilling, which includes fluid circulation, is important for wellbore stability analysis. In this work, a pseudo-3D model is developed to simultaneously calculate the heat exchange between the flowing fluid and the surrounding media (drill pipe and rock formation) and the in-plane thermoelastic stresses. The cold drilling fluid descends through the drill pipe at constant injection rates and returns to the ground surface via the annulus. The fluid circulation will decrease the wellbore bottom temperature and reduce the near-wellbore high compressive stress, potentially leading to tensile fracturing of the well. The governing equations for the coupled heat transfer stress problem are formulated to ensure that the most important parameters are taken into account. The wellbore is subject to a non-hydrostatic in situ far-field stress field. In modeling heat exchange between fluid and surrounding media, the heat transfer coefficients are dependent on fluid properties and flow behavior. Analytical solutions in the Laplace space are obtained for the temperatures of the fluid in both the drill pipe and annulus and for the temperature and stress changes in the formation. The numerical results in the time domain are obtained by using an efficient inversion approach. In particular, the near-well stresses are compared for the cases with fixed and time-dependent cooling wellbore conditions. This comparison indicates that the using a fixed temperature wellbore conditions may over-estimate or under-estimate the bottom-hole stress change, potentially leading to wellbore stability problems. |
| first_indexed | 2024-04-13T00:24:48Z |
| format | Article |
| id | doaj.art-c0a03828f1f44f46aea7ebef6cc1630d |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T00:24:48Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-c0a03828f1f44f46aea7ebef6cc1630d2022-12-22T03:10:39ZengMDPI AGEnergies1996-10732017-12-011114210.3390/en11010042en11010042A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid CirculationBisheng Wu0Tianle Liu1Xi Zhang2Bailin Wu3Robert G. Jeffrey4Andrew P. Bunger5CSIRO Energy, Clayton, VIC 3168, AustraliaFaculty of Engineering, China University of Geosciences, Wuhan 430074, ChinaCSIRO Energy, Clayton, VIC 3168, AustraliaCSIRO Energy, Clayton, VIC 3168, AustraliaSCT Operations, Wollongong, NSW 2500, AustraliaDepartment of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USAAccurate characterization of heat transfer in a wellbore during drilling, which includes fluid circulation, is important for wellbore stability analysis. In this work, a pseudo-3D model is developed to simultaneously calculate the heat exchange between the flowing fluid and the surrounding media (drill pipe and rock formation) and the in-plane thermoelastic stresses. The cold drilling fluid descends through the drill pipe at constant injection rates and returns to the ground surface via the annulus. The fluid circulation will decrease the wellbore bottom temperature and reduce the near-wellbore high compressive stress, potentially leading to tensile fracturing of the well. The governing equations for the coupled heat transfer stress problem are formulated to ensure that the most important parameters are taken into account. The wellbore is subject to a non-hydrostatic in situ far-field stress field. In modeling heat exchange between fluid and surrounding media, the heat transfer coefficients are dependent on fluid properties and flow behavior. Analytical solutions in the Laplace space are obtained for the temperatures of the fluid in both the drill pipe and annulus and for the temperature and stress changes in the formation. The numerical results in the time domain are obtained by using an efficient inversion approach. In particular, the near-well stresses are compared for the cases with fixed and time-dependent cooling wellbore conditions. This comparison indicates that the using a fixed temperature wellbore conditions may over-estimate or under-estimate the bottom-hole stress change, potentially leading to wellbore stability problems.https://www.mdpi.com/1996-1073/11/1/42enhanced geothermal systemfluid circulationwellbore stabilitycoupled wellbore/reservoir model |
| spellingShingle | Bisheng Wu Tianle Liu Xi Zhang Bailin Wu Robert G. Jeffrey Andrew P. Bunger A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation Energies enhanced geothermal system fluid circulation wellbore stability coupled wellbore/reservoir model |
| title | A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation |
| title_full | A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation |
| title_fullStr | A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation |
| title_full_unstemmed | A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation |
| title_short | A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation |
| title_sort | transient analytical model for predicting wellbore reservoir temperature and stresses during drilling with fluid circulation |
| topic | enhanced geothermal system fluid circulation wellbore stability coupled wellbore/reservoir model |
| url | https://www.mdpi.com/1996-1073/11/1/42 |
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