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| 页岩气储层损害机制及保护水基钻完井液技术 |
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黄维安1, 邱正松1, 岳星辰1, 李树皎2, 高宏松3, 曹 杰1, 刘文迪4
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(1.中国石油大学石油工程学院,山东青岛 266580;2.中国石油长城钻探工程公司,北京 100101;3.中海油能源发展股份有限公司天津人力资源服务分公司,天津 300452;4.中国石油大学储运与建筑工程学院,山东青岛 266580)
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| 摘要: |
| 针对页岩气藏特征及开采方式,通过X射线衍射、扫描电镜分析、气体膨胀置换法、脉冲衰减法和敏感性评价等手段,分析胜利油田沙河街组页岩气储层潜在损害因素及敏感性损害程度。提出页岩气储层保护水基钻完井液对策,研选出微乳型页岩气储层保护剂YYBH-1和聚胺类表面水化抑制剂BMYZ-1,研制出页岩气储层水基钻井液体系。结果表明:该页岩气储层黏土矿物以伊利石为主,孔隙度分布在0.45％～2.50％,平均孔隙直径主要在4.54～6.17nm,渗透率小于0.026×10-3 μm2,为低孔超低渗储层;页岩气储层存在中等偏弱水敏性和碱敏性损害以及中等程度应力敏感性损害;页岩气储层水基钻井液体系能有效防止水敏性,增强水的返排能力,降低页岩渗透率损害率和对甲烷气体的吸附能力,具有优良的页岩气储层综合保护作用。 |
| 关键词: 页岩气储层 损害机制 微乳液 水基钻井液 等温吸附 |
| DOI：10.3969/j.issn.1673-5005.2014.03.016 |
| 分类号:TE 254 〖HTH〗 |
| 基金项目:国家自然科学基金重点项目(51034007);国家自然科学基金项目(41072094);国家自然科学基金项目(51374233) |
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| Damage mechanism and water-based drilling fluid protection technology for shale gas reservoir |
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HUANG Wei-an1, QIU Zheng-song1, YUE Xing-chen1, LI Shu-jiao2, GAO Hong-song3, CAO Jie1, LIU Wen-di4
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(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.PetroChina Great Wall Drilling Company Limited, Beijing 100101, China;3.CNOOC Energy Development Corporation Limited, Tianjin Branch of Human Resources, Tianjin 300452, China;4.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| Aimed at the features of shale gas reservoir and shale gas exploitation manners, the potential damage factors and sensitivities of shale formation in Shahejie Formation of Shengli Oilfield were analyzed by X-ray diffraction, scanning electron microscope, gas expansion displacement method, pulse decay method, and sensitivity evaluation. The protection measurement of water-based drilling and completing fluid for shale gas reservoir was proposed. The water-based drilling fluid formulation was developed based on the selecting of microemulsion shale gas formation protector YYBH-1and polyamine surface hydration inhibitor BMYZ-1. Then the water-based drilling and completing fluid for shale gas reservoir was prepared. The results show that the clay mineral of shale formation is mainly composed of illites, in which the porosity distribution varies from 0.45％ to 2.50％, the average pore diameter is between 4.54nm and 6.17nm, and the permeability is less than 0.026×10-3 μm2. It is classic low porous and ultra-low permeable reservoir and has less medium water sensitivity, alkaline sensitivity, as well as medium stress sensitivity. This system can prevent water sensitivity and improve the flowback of water effectively, decrease the loss ratio of shale permeability and absorptive capacity of methane. It has excellent protection function for shale gas formation. |
| Key words: shale gas reservoir damage mechanism microemulsion water-based drilling fluid isothermal adsorption |
