Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs
Small-scale true triaxial sand fracturing experiments are conducted on thin interbedded shale samples made from cores of Permian Lucaogou Formation shale oil reservoir in Jimsar sag, Junggar Basin, NW China. Combined with high-precision CT scanning digital core model reconstruction technology, hydra...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-10-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380422603422 |
| _version_ | 1828220373837021184 |
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| author | Yushi ZOU Shanzhi SHI Shicheng ZHANG Jianmin LI Fei WANG Junchao WANG Xiaohuan ZHANG |
| author_facet | Yushi ZOU Shanzhi SHI Shicheng ZHANG Jianmin LI Fei WANG Junchao WANG Xiaohuan ZHANG |
| author_sort | Yushi ZOU |
| collection | DOAJ |
| description | Small-scale true triaxial sand fracturing experiments are conducted on thin interbedded shale samples made from cores of Permian Lucaogou Formation shale oil reservoir in Jimsar sag, Junggar Basin, NW China. Combined with high-precision CT scanning digital core model reconstruction technology, hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs are studied. The research shows that: In thin interbedded shale oil reservoir, the interlayer difference of rock mechanics and the interlayer interface near the wellbore cannot restrain the growth of fracture height effectively, but has a significant impact on the fracture width distribution in the fracture height direction. Hydraulic fractures in these reservoirs tend to penetrate into the adjacent layer in “step-like” form, but have a smaller width at the interface deflection, which hinders the transport of proppant in vertical direction, resulting in a poor effect of layer-crossing growth. In shale layers with dense laminae, hydraulic fractures tend to form “丰” or “井” shapes. If the perforated interval is large in rock strength and high in breakdown pressure, the main fracture is fully developed initially, large in width, and supported by enough sand. In contrast, if the perforated interval is low in strength and rich in laminae, the fracturing fluid filtration loss is large, the breakdown pressure is low, the main fracture will not open wide initially, and likely to have sand plugging. Proppant is mainly concentrated in the main hydraulic fractures with large width near the perforated layer, activated laminae, branch fractures and fractures in adjacent layers contain only a small amount of (or zero) proppant. The proppant is placed in a limited range on the whole. The limit width of fracture that proppant can enter is about 2.7 times the proppant particle size. |
| first_indexed | 2024-04-12T16:26:23Z |
| format | Article |
| id | doaj.art-455f9b69bbbd4bce932d735f5631f74a |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-04-12T16:26:23Z |
| publishDate | 2022-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-455f9b69bbbd4bce932d735f5631f74a2022-12-22T03:25:22ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042022-10-0149511851194Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirsYushi ZOU0Shanzhi SHI1Shicheng ZHANG2Jianmin LI3Fei WANG4Junchao WANG5Xiaohuan ZHANG6State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; Corresponding authorEngineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaEngineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaEngineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaSmall-scale true triaxial sand fracturing experiments are conducted on thin interbedded shale samples made from cores of Permian Lucaogou Formation shale oil reservoir in Jimsar sag, Junggar Basin, NW China. Combined with high-precision CT scanning digital core model reconstruction technology, hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs are studied. The research shows that: In thin interbedded shale oil reservoir, the interlayer difference of rock mechanics and the interlayer interface near the wellbore cannot restrain the growth of fracture height effectively, but has a significant impact on the fracture width distribution in the fracture height direction. Hydraulic fractures in these reservoirs tend to penetrate into the adjacent layer in “step-like” form, but have a smaller width at the interface deflection, which hinders the transport of proppant in vertical direction, resulting in a poor effect of layer-crossing growth. In shale layers with dense laminae, hydraulic fractures tend to form “丰” or “井” shapes. If the perforated interval is large in rock strength and high in breakdown pressure, the main fracture is fully developed initially, large in width, and supported by enough sand. In contrast, if the perforated interval is low in strength and rich in laminae, the fracturing fluid filtration loss is large, the breakdown pressure is low, the main fracture will not open wide initially, and likely to have sand plugging. Proppant is mainly concentrated in the main hydraulic fractures with large width near the perforated layer, activated laminae, branch fractures and fractures in adjacent layers contain only a small amount of (or zero) proppant. The proppant is placed in a limited range on the whole. The limit width of fracture that proppant can enter is about 2.7 times the proppant particle size.http://www.sciencedirect.com/science/article/pii/S1876380422603422shale oilthin interbedded reservoirrock mechanicslithologic interfacehydraulic fracturingfracture shape |
| spellingShingle | Yushi ZOU Shanzhi SHI Shicheng ZHANG Jianmin LI Fei WANG Junchao WANG Xiaohuan ZHANG Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs Petroleum Exploration and Development shale oil thin interbedded reservoir rock mechanics lithologic interface hydraulic fracturing fracture shape |
| title | Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| title_full | Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| title_fullStr | Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| title_full_unstemmed | Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| title_short | Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| title_sort | hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs |
| topic | shale oil thin interbedded reservoir rock mechanics lithologic interface hydraulic fracturing fracture shape |
| url | http://www.sciencedirect.com/science/article/pii/S1876380422603422 |
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