Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis
In the field of cement, if the formation cannot be given sufficient pressure to maintain stability during construction, pressure control failure may occur, leading to the leakage of liquids and gasses from the formation to the wellbore. In addition, irregular wellbore diameter and casing eccentricit...
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| Формат: | Өгүүллэг |
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MDPI AG
2024-10-01
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| Цуврал: | Applied Sciences |
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| Онлайн хандалт: | https://www.mdpi.com/2076-3417/14/20/9573 |
| _version_ | 1827048825820282880 |
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| author | Fujie Yang Jinfei Sun Hanlin Luo Yue Shi Jingyan Zhang Zaoyuan Li |
| author_facet | Fujie Yang Jinfei Sun Hanlin Luo Yue Shi Jingyan Zhang Zaoyuan Li |
| author_sort | Fujie Yang |
| collection | DOAJ |
| description | In the field of cement, if the formation cannot be given sufficient pressure to maintain stability during construction, pressure control failure may occur, leading to the leakage of liquids and gasses from the formation to the wellbore. In addition, irregular wellbore diameter and casing eccentricity are important factors that are easily overlooked and affect the prediction of ECD (Equivalent Circulation Density) calculation. This results in major accidents and ecological disasters, further impacting the global environment. This study focuses on a well in the eastern oilfields of China, and based on a rheological experiment of high temperature and high pressure, an irregular eccentric wellbore model is established according to the measured wellbore diameter and eccentricity data to calculate the ECD of the whole cementing process. Then, a data set is constructed and analyzed using the random forest method to quantitatively evaluate influencing factors such as displacement, rheology, density, and eccentricity on the bottomhole and wellbore ECD. Results find that the density of cement slurry and drilling fluid has the most significant impact on the maximum ECD, with the impact reaching 0.3142 and 0.2902, respectively, and the main factors that affect the minimum ECD are the density and rheological changes in the drilling fluid, reaching 0.7014 and 0.2846. These research findings will contribute to the precise control of wellbore pressure during cementing operations, further ensuring the safety of cementing operations, and laying a technical foundation for the automation and intelligentization of subsequent cementing operations. |
| first_indexed | 2025-02-18T15:34:44Z |
| format | Article |
| id | doaj.art-cae4e52e90bb40ac87b1b51a0cf139a0 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2025-02-18T15:34:44Z |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-cae4e52e90bb40ac87b1b51a0cf139a02024-10-25T13:47:14ZengMDPI AGApplied Sciences2076-34172024-10-011420957310.3390/app14209573Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors AnalysisFujie Yang0Jinfei Sun1Hanlin Luo2Yue Shi3Jingyan Zhang4Zaoyuan Li5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610600, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610600, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610600, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610600, ChinaPetroChina Tarim Oilfield Company, CNPC, Korla 841000, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610600, ChinaIn the field of cement, if the formation cannot be given sufficient pressure to maintain stability during construction, pressure control failure may occur, leading to the leakage of liquids and gasses from the formation to the wellbore. In addition, irregular wellbore diameter and casing eccentricity are important factors that are easily overlooked and affect the prediction of ECD (Equivalent Circulation Density) calculation. This results in major accidents and ecological disasters, further impacting the global environment. This study focuses on a well in the eastern oilfields of China, and based on a rheological experiment of high temperature and high pressure, an irregular eccentric wellbore model is established according to the measured wellbore diameter and eccentricity data to calculate the ECD of the whole cementing process. Then, a data set is constructed and analyzed using the random forest method to quantitatively evaluate influencing factors such as displacement, rheology, density, and eccentricity on the bottomhole and wellbore ECD. Results find that the density of cement slurry and drilling fluid has the most significant impact on the maximum ECD, with the impact reaching 0.3142 and 0.2902, respectively, and the main factors that affect the minimum ECD are the density and rheological changes in the drilling fluid, reaching 0.7014 and 0.2846. These research findings will contribute to the precise control of wellbore pressure during cementing operations, further ensuring the safety of cementing operations, and laying a technical foundation for the automation and intelligentization of subsequent cementing operations.https://www.mdpi.com/2076-3417/14/20/9573cementingenvironmental protectionECD calculationmachine learningweight analysis |
| spellingShingle | Fujie Yang Jinfei Sun Hanlin Luo Yue Shi Jingyan Zhang Zaoyuan Li Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis Applied Sciences cementing environmental protection ECD calculation machine learning weight analysis |
| title | Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis |
| title_full | Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis |
| title_fullStr | Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis |
| title_full_unstemmed | Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis |
| title_short | Irregular Eccentric Wellbore Cementing: An Equivalent Circulation Density Calculation and Influencing Factors Analysis |
| title_sort | irregular eccentric wellbore cementing an equivalent circulation density calculation and influencing factors analysis |
| topic | cementing environmental protection ECD calculation machine learning weight analysis |
| url | https://www.mdpi.com/2076-3417/14/20/9573 |
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