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首页> 外文会议>ISRM Young Scholars Symposium on Rock Mechanics >Mechanism of Natural Fractures Opening in Ultra-deep Fractured Reservoir during Stimulation
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Mechanism of Natural Fractures Opening in Ultra-deep Fractured Reservoir during Stimulation

机译：刺激期间超深裂缝储层中自然骨折的机制

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In the deep wells of more than 7,000 meters in the Tarim Oilfield in China,the opening of natural fractures in the reservoir directly affects the productivity of single wells,and it is necessary to start research on the mechanism of natural fractures.Through the core mechanics experiment and the block geostress modeling,theoretical analysis,numerical simulation and case analysis are used to determine the shear failure of natural fractures during fracturing in ultra deep fractured reservoir．It is suggested that natural fractures become shear failure when pore pressure reaches the natural fracture opening threshold，and natural fractures with weak surface cementation and the dip angle greater than 60°are more likely to happen for such a shear failure． The pumping pressure during fracturing increases linearly with the pore pressure in natural fractures,and it is difficult to achieve full opening of natural fractures in ultra-deep reservoir fracturing.Under the current working conditions,hydraulic fractures are opened along the natural fracture development section,and it is difficult to achieve the fracture of the rock body,and some natural fractures in favorable orientation also cannot be opened.After researching the failure mechanism of natural fractures,the fracturing process can improve the stimulated reservoir volume by optimizing the fracturing parameters such as liquid combination,displacement,sand addition and pumping procedure.The field application achieved good results.
机译：在塔里木油田在中国7000多米的深水井，天然裂缝储层中的开口直接影响单井的生产力，有必要对自然fractures.Through核心机制的机理展开调研实验和块地应力建模，理论分析，数值模拟和分析的情况下被用来确定在超深压裂过程中天然裂缝的剪切破坏断后reservoir.It建议天然裂缝成为当孔隙压力达到天然裂缝开口剪切破坏阈值，并与弱表面胶结和倾角大于60°更可能发生这样的剪切破坏天然裂缝。与天然裂缝中的孔隙压力线性地增加压裂过程中泵送压力，并且难以实现超深储fracturing.Under天然裂缝的当前工作条件，水力裂缝沿着天然裂缝发展部打开的完全打开，并且难以实现岩体的断裂，并在良好的取向性一些天然裂缝也不能opened.After研究天然裂缝的破坏机理，压裂过程可以通过优化压裂参数，诸如改善刺激储层体积液体组合，位移，除了沙子和泵送procedure.The现场应用取得了良好的效果。

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