Chemical Effect on Wellbore Instability of Nahr Umr Shale
Wellbore instability is one of the major problems that hamper the drilling speed in Halfaya Oilfield. Comprehensive analysis of geological and engineering data indicates that Halfaya Oilfield features fractured shale in the Nahr Umr Formation. Complex accidents such as wellbore collapse and sticking...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2013/931034 |
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| _version_ | 1832558699008229376 |
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| author | Baohua Yu Chuanliang Yan Zhen Nie |
| author_facet | Baohua Yu Chuanliang Yan Zhen Nie |
| author_sort | Baohua Yu |
| collection | DOAJ |
| description | Wellbore instability is one of the major problems that hamper the drilling speed in Halfaya Oilfield. Comprehensive analysis of geological and engineering data indicates that Halfaya Oilfield features fractured shale in the Nahr Umr Formation. Complex accidents such as wellbore collapse and sticking emerged frequently in this formation. Tests and theoretical analysis revealed that wellbore instability in the Halfaya Oilfield was influenced by chemical effect of fractured shale and the formation water with high ionic concentration. The influence of three types of drilling fluids on the rock mechanical properties of Nahr Umr Shale is tested, and time-dependent collapse pressure is calculated. Finally, we put forward engineering countermeasures for safety drilling in Halfaya Oilfield and point out that increasing the ionic concentration and improving the sealing capacity of the drilling fluid are the way to keep the wellbore stable. |
| format | Article |
| id | doaj-art-f6741bc6bd644602b75cf3518f9f72b4 |
| institution | Kabale University |
| issn | 1537-744X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-f6741bc6bd644602b75cf3518f9f72b42025-02-03T01:31:47ZengWileyThe Scientific World Journal1537-744X2013-01-01201310.1155/2013/931034931034Chemical Effect on Wellbore Instability of Nahr Umr ShaleBaohua Yu0Chuanliang Yan1Zhen Nie2State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, ChinaExploration & Production Research Institute, CNPC, Beijing 100011, ChinaWellbore instability is one of the major problems that hamper the drilling speed in Halfaya Oilfield. Comprehensive analysis of geological and engineering data indicates that Halfaya Oilfield features fractured shale in the Nahr Umr Formation. Complex accidents such as wellbore collapse and sticking emerged frequently in this formation. Tests and theoretical analysis revealed that wellbore instability in the Halfaya Oilfield was influenced by chemical effect of fractured shale and the formation water with high ionic concentration. The influence of three types of drilling fluids on the rock mechanical properties of Nahr Umr Shale is tested, and time-dependent collapse pressure is calculated. Finally, we put forward engineering countermeasures for safety drilling in Halfaya Oilfield and point out that increasing the ionic concentration and improving the sealing capacity of the drilling fluid are the way to keep the wellbore stable.http://dx.doi.org/10.1155/2013/931034 |
| spellingShingle | Baohua Yu Chuanliang Yan Zhen Nie Chemical Effect on Wellbore Instability of Nahr Umr Shale The Scientific World Journal |
| title | Chemical Effect on Wellbore Instability of Nahr Umr Shale |
| title_full | Chemical Effect on Wellbore Instability of Nahr Umr Shale |
| title_fullStr | Chemical Effect on Wellbore Instability of Nahr Umr Shale |
| title_full_unstemmed | Chemical Effect on Wellbore Instability of Nahr Umr Shale |
| title_short | Chemical Effect on Wellbore Instability of Nahr Umr Shale |
| title_sort | chemical effect on wellbore instability of nahr umr shale |
| url | http://dx.doi.org/10.1155/2013/931034 |
| work_keys_str_mv | AT baohuayu chemicaleffectonwellboreinstabilityofnahrumrshale AT chuanliangyan chemicaleffectonwellboreinstabilityofnahrumrshale AT zhennie chemicaleffectonwellboreinstabilityofnahrumrshale |