Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir
Drilling fluid loss in depleted reservoir has been an import issue faced by further tapping the potential of old oil fields. Accurate evaluation of the fracture pressure is the foundation to avoid mud loss. Traditional views suggest that tensile failure is the only fracture mode and the fracture pre...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/5581549 |
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| author | Kai Zhao Junliang Yuan Ming Liu Chuanliang Yan Liangbin Dou Gang Bi Runsen Li Wei Gao |
| author_facet | Kai Zhao Junliang Yuan Ming Liu Chuanliang Yan Liangbin Dou Gang Bi Runsen Li Wei Gao |
| author_sort | Kai Zhao |
| collection | DOAJ |
| description | Drilling fluid loss in depleted reservoir has been an import issue faced by further tapping the potential of old oil fields. Accurate evaluation of the fracture pressure is the foundation to avoid mud loss. Traditional views suggest that tensile failure is the only fracture mode and the fracture pressure should be determined by a tensile failure criterion, which are not suitable for wells drilled in the depleted reservoir. In this paper, the analysis focuses on the fracture mode and fracture pressure in depleted reservoir, and case studies show that three fracture modes may first occur, and the fracture mode will be changed with reservoir depletion which highly depends on reservoir depletion degree, well azimuth and deviation angle, and the in situ stress state; different failure criteria at different stages of reservoir depletion should be selected to accurately evaluate the fracture pressure. For the vertical well, fracture pressure is no longer a single linear reduction with reservoir depletion; instead, a three-step and two-step reduction may appear, and for the directional well, the fracture pressure is not always decreased; the other patterns such as increase and first increase then decrease may also appear for the wells drilled in reverse and strike fault stress regimes. |
| format | Article |
| id | doaj-art-7cdeea86ce0042b6b668560c11b29a97 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-7cdeea86ce0042b6b668560c11b29a972025-02-03T01:27:01ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/55815495581549Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted ReservoirKai Zhao0Junliang Yuan1Ming Liu2Chuanliang Yan3Liangbin Dou4Gang Bi5Runsen Li6Wei Gao7College of Petroleum Engineering, Xi’an Shiyou University, Xi’an, ChinaCNOOC Research Institute Co., Ltd., Beijing, ChinaCNPC Oilfield Technical Service Limited, Oil Mansion, No. 9 Dongzhimen North St., Dongcheng Dist., Beijing, ChinaSchool of Petroleum Engineering, China University of Petroleum (East China), Qingdao, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an, ChinaDrilling fluid loss in depleted reservoir has been an import issue faced by further tapping the potential of old oil fields. Accurate evaluation of the fracture pressure is the foundation to avoid mud loss. Traditional views suggest that tensile failure is the only fracture mode and the fracture pressure should be determined by a tensile failure criterion, which are not suitable for wells drilled in the depleted reservoir. In this paper, the analysis focuses on the fracture mode and fracture pressure in depleted reservoir, and case studies show that three fracture modes may first occur, and the fracture mode will be changed with reservoir depletion which highly depends on reservoir depletion degree, well azimuth and deviation angle, and the in situ stress state; different failure criteria at different stages of reservoir depletion should be selected to accurately evaluate the fracture pressure. For the vertical well, fracture pressure is no longer a single linear reduction with reservoir depletion; instead, a three-step and two-step reduction may appear, and for the directional well, the fracture pressure is not always decreased; the other patterns such as increase and first increase then decrease may also appear for the wells drilled in reverse and strike fault stress regimes.http://dx.doi.org/10.1155/2021/5581549 |
| spellingShingle | Kai Zhao Junliang Yuan Ming Liu Chuanliang Yan Liangbin Dou Gang Bi Runsen Li Wei Gao Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir Geofluids |
| title | Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir |
| title_full | Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir |
| title_fullStr | Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir |
| title_full_unstemmed | Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir |
| title_short | Wellbore Fracture Mode and Fracture Pressure Drilled in Depleted Reservoir |
| title_sort | wellbore fracture mode and fracture pressure drilled in depleted reservoir |
| url | http://dx.doi.org/10.1155/2021/5581549 |
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