| 水力压裂多裂缝起裂射孔参数优化研究 |
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| 引用本文： | 王素玲, 张影, 朱永超, 孙卫国. 水力压裂多裂缝起裂射孔参数优化研究[J]. 力学与实践, 2015, 37(5): 607-611. doi: 10.6052/1000-0879-14-410 |
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| 作者姓名： | 王素玲 张影 朱永超 孙卫国 |
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| 作者单位： | 1 东北石油大学机械科学与工程学院, 黑龙江大庆 163318; 2 中国石油技术开发公司, 北京 100101; 3 大庆油田第二采油厂, 黑龙江大庆 163414 |
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| 基金项目： | 国家自然科学基金项目(51374074),中石油青年基金项目(2013D-5006-0210)及东北石油大学研究生创新科研项目(YJSCX2015-026NEPU)资助. |
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| 摘 要： | 针对复杂地质近井筒多裂缝起裂的难题, 结合岩体力学与损伤力学相关理论, 建立了近井筒地层流固——损伤力学模型, 采用数值求解获得了射孔壁面的应力及损伤状态, 计算表明:初始地应力最小值越小, 地层的起裂压力越低;射孔方位角越小, 起裂压力越低. 随着射孔方位角增大, 近井筒微裂缝为45° 夹角的拐折裂缝, 起裂压力增大, 基于此, 对于正断层及顺滑断层地应力类型, 取射孔方位角小于30°, 螺旋射孔夹角30°或45°, 对于逆断层地应力类型, 螺旋射孔夹角取45°, 可有效地实现多裂缝起裂.
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| 关 键 词： | 局部地应力场 多裂缝起裂 裂缝形态 射孔参数优化 数值模拟 |
| 收稿时间： | 2015-01-21 |
| 修稿时间： | 2015-02-25 |
THE PERFORATION PARAMETER OPTIMIZATION FOR MULTI FRACTURE INITIATION IN HYDRAULIC FRACTURING |
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| WANG Suling, ZHANG Ying, ZHU Yongchao, SUN Weiguo. THE PERFORATION PARAMETER OPTIMIZATION FOR MULTI FRACTURE INITIATION IN HYDRAULIC FRACTURING[J]. Mechanics in Engineering, 2015, 37(5): 607-611. doi: 10.6052/1000-0879-14-410 |
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| Authors: | WANG Suling ZHANG Ying ZHU Yongchao SUN Weiguo |
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| Affiliation: | 1 Northeast Petroleum University, Daqing 163318, Heilongjiang, China; 2 CPTDC, Beijing 100101, China; 3 No.2 Oil Production Site, Daqing Oilfields Co Ltd, Daqing 163414, Heilongjiang, China |
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| Abstract: | A model of damage mechanics of fluid and solid near the wellbore is established, for the multi-fracture initiation near wellbore under complicated geological conditions, and the distribution of stress and damage of perforated wall is obtained by numerical analysis. Calculation shows that the smaller the crustal stress value is, the smaller the well perforation azimuth angle is, the lower the crack pressure will be. The crack stress increases with the increase of the perforation azimuth angle. When the near wellbore has inflexion cracks and an angle of 45° micro crack, the crack pressure increases. Based on this conclusion, the perforation azimuth angle is less than 30° for normal fault and smooth fault, when the spiral perforation angle is 30° or 45° and the thrust fault is 45°, multi-fracture initiation will be implemented effectively. |
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| Keywords: | local stress field|multi-fracture initiation|fracture morphology|perforation parameter optimization|numerical simulation |
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