True triaxial mechanical characteristics of tight sandstone with different oil and water staturation
The occurrence of fluids such as water, oil or natural gas in tight sandstone reservoirs may affect the mechanical characteristics of tight sandstone. This paper selects tight sandstones of Yanchang Formation in Panlong area of Ordos Basin, and uses YSZS-2000 multifunctional electro-hydraulic servo...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Bulletin of Geological Science and Technology
2023-01-01
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| Series: | 地质科技通报 |
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| Online Access: | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2022.0146 |
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| author | Pengxiang Xu Xiangdong Chen Zhao Liu Xin Cheng Yiqian Qu Qiushi Li Chunxiao Ma Hanning Wu |
| author_facet | Pengxiang Xu Xiangdong Chen Zhao Liu Xin Cheng Yiqian Qu Qiushi Li Chunxiao Ma Hanning Wu |
| author_sort | Pengxiang Xu |
| collection | DOAJ |
| description | The occurrence of fluids such as water, oil or natural gas in tight sandstone reservoirs may affect the mechanical characteristics of tight sandstone. This paper selects tight sandstones of Yanchang Formation in Panlong area of Ordos Basin, and uses YSZS-2000 multifunctional electro-hydraulic servo rock true triaxial testing machine to study the mechanical characteristics of tight sandstones with different oil and water saturation degrees. Results show that: ①The oil contents have a weakening effect on the peak stress and elastic modulus of sandstones. Both the peak stress and elastic modulus decrease with the increase of oil saturation. The peak stress can be reduced by 5.35% and the elastic modulus can be reduced by 11.38% when it is "quasi-saturated". ②Sandstones containing water can be divided into the Pa-type and the Pb-type according to the water absorption characteristic curve. Water content weakens the peak stress of sandstones. When saturated, the peak stresses of a Pa-type and a Pb-type sandstone can be reduced by 11.58% and 15.95%, respectively. ③After observing the internal structure of the oil-soaked sandstone, it is found that the oil is concentrated in the fractures between the sandstone minerals, which lubricates the fractured surface and reduces the bearing capacity of the sandstone. The research outcomes of this article can provide a reliable basis for the exploitation of tight oil and gas. |
| first_indexed | 2024-03-07T15:50:50Z |
| format | Article |
| id | doaj.art-e90cc8a4732f481abd013a37c074c500 |
| institution | Directory Open Access Journal |
| issn | 2096-8523 |
| language | zho |
| last_indexed | 2024-03-07T15:50:50Z |
| publishDate | 2023-01-01 |
| publisher | Editorial Department of Bulletin of Geological Science and Technology |
| record_format | Article |
| series | 地质科技通报 |
| spelling | doaj.art-e90cc8a4732f481abd013a37c074c5002024-03-05T02:56:01ZzhoEditorial Department of Bulletin of Geological Science and Technology地质科技通报2096-85232023-01-01421707710.19509/j.cnki.dzkq.2022.0146dzkjtb-42-1-70True triaxial mechanical characteristics of tight sandstone with different oil and water staturationPengxiang Xu0Xiangdong Chen1Zhao Liu2Xin Cheng3Yiqian Qu4Qiushi Li5Chunxiao Ma6Hanning Wu7State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, ChinaState Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, ChinaNo.5 Oil Production Plant of Changqing Oilfield Company, PetroChina, Xi'an 710200, ChinaState Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, ChinaState Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, ChinaNo.8 Oil Production Plant of Changqing Oilfield Company, PetroChina, Xi'an 710021, ChinaResearch Institute of Yanchang Petroleum Group Research Institute, Xi'an 710065, ChinaState Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, ChinaThe occurrence of fluids such as water, oil or natural gas in tight sandstone reservoirs may affect the mechanical characteristics of tight sandstone. This paper selects tight sandstones of Yanchang Formation in Panlong area of Ordos Basin, and uses YSZS-2000 multifunctional electro-hydraulic servo rock true triaxial testing machine to study the mechanical characteristics of tight sandstones with different oil and water saturation degrees. Results show that: ①The oil contents have a weakening effect on the peak stress and elastic modulus of sandstones. Both the peak stress and elastic modulus decrease with the increase of oil saturation. The peak stress can be reduced by 5.35% and the elastic modulus can be reduced by 11.38% when it is "quasi-saturated". ②Sandstones containing water can be divided into the Pa-type and the Pb-type according to the water absorption characteristic curve. Water content weakens the peak stress of sandstones. When saturated, the peak stresses of a Pa-type and a Pb-type sandstone can be reduced by 11.58% and 15.95%, respectively. ③After observing the internal structure of the oil-soaked sandstone, it is found that the oil is concentrated in the fractures between the sandstone minerals, which lubricates the fractured surface and reduces the bearing capacity of the sandstone. The research outcomes of this article can provide a reliable basis for the exploitation of tight oil and gas.https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2022.0146true triaxial testtight sandstonemechanical characteristicspeak stresselastic modulus |
| spellingShingle | Pengxiang Xu Xiangdong Chen Zhao Liu Xin Cheng Yiqian Qu Qiushi Li Chunxiao Ma Hanning Wu True triaxial mechanical characteristics of tight sandstone with different oil and water staturation 地质科技通报 true triaxial test tight sandstone mechanical characteristics peak stress elastic modulus |
| title | True triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| title_full | True triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| title_fullStr | True triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| title_full_unstemmed | True triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| title_short | True triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| title_sort | true triaxial mechanical characteristics of tight sandstone with different oil and water staturation |
| topic | true triaxial test tight sandstone mechanical characteristics peak stress elastic modulus |
| url | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2022.0146 |
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