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摘要:
Drilling in a natural gas hydrate formation is challenging due to the poor consolidation of the formation and the potential evaporation of the hydrate.The unreasonable down-hole pressure of the drilling fluid can not only lead to the wellbore instability,but also change the predrilling condition of the natural gas hydrate formation,thus leading to an instable wellbore.In this paper,the integrated discrete element method (DEM)-computational fluid dynamics (CFD) work flow is developed to study the wellbore instability due to the penetration of the drilling fluid into the hydrate formation during crack propa-gations.The results show that the difference between in-situ stresses and overpressure directly affect the drilling fluid invasion behavior.The lower hydrate saturation leads to an easier generation of drilling fluid flow channels and the lower formation breakdown pressure.The breakdown pressure increases with the increase of hydrate saturation,this also indicates that hydrates can enhance the mechanical properties of the formation.The induced cracks are initially accompanied with higher pressure of the drilling fluid.According to the rose diagram of the fracture orientation,a wider orientation of the fracture distribution is observed at higher pressure of the invasion fluid.
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篇名 Near-wellbore fracture initiation and propagation induced by drilling fluid invasion during solid fluidization mining of submarine nature gas hydrate sediments
来源期刊 石油科学(英文版) 学科
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年,卷(期) 2021,(6) 所属期刊栏目 Petroleum Engineering & Mechanics
研究方向 页码范围 1739-1752
页数 14页 分类号
字数 语种 英文
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石油科学(英文版)
季刊
1672-5107
11-4995/TE
大16开
北京市学院路20号石油大院15楼317室
2004
eng
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1221
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