INVESTIGATION OF THE TEMPERATURE FIELD IN A WELL WITH THE VARIABLE DIAMETER AFTER CIRCULATION
Relevance. At present, there are no general methods for determining temperature of an undisturbed formation from thermometry data in non-equilibrium wells. When drilling a well, the natural temperature distribution in the formation surrounding the well changes significantly and it takes a considerab...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2022-08-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/3431/2776 |
| Summary: | Relevance. At present, there are no general methods for determining temperature of an undisturbed formation from thermometry data in non-equilibrium wells. When drilling a well, the natural temperature distribution in the formation surrounding the well changes significantly and it takes a considerable time to wait for its restoration. This process can last up to a number of months and even more in deep wells. Therefore, the undisturbed formation can only be directly measured in a small number of shut-in wells. Modeling the temperature recovery process in wells after drilling is the only way to predict the undisturbed formation temperature, required to the equilibrium temperature gradient and heat flux density determination in order to provide necessary initial data for basin and hydrocarbon system modeling.
Object: drilling wells and preliminary flushed wells before temperature studies. Well diameter changes after drilling due to the presence of cavities. The cavities affect the temperature distribution after the well casing, since the volume of injected cement in these intervals is increasing.
Purpose of the research is to determine the temperature field disturbance in the depth intervals with a changed well diameter due to the cavitation process, as well as the cement sheath effect on the temperature distributions.
Results. The influence of cavity size (height and depth) on the temperature field in the well was studied. The authors developed the mathematical model describing flushing fluid movement in the well and taking into account changes in well diameter. It was shown that the temperature field opposite the cave intervals is strongly disturbed in an uncased well. It was revealed that with an increase in the flow rate of the flushing fluid the temperature field is most strongly disturbed opposite the bottom of the cavity interval. |
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| ISSN: | 2500-1019 2413-1830 |