脉冲水力压裂条件下水力裂缝与已有裂缝的相互作用

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Chao Wei, Bo Zhang, Shucai Li, Zhi-Guo Fan, Chengxin Li
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引用次数: 12

摘要

脉冲水力压裂技术可以极大地提高裂缝在岩石中的扩展效果,在储层中形成复杂的裂缝网络。脉动水压作用下水力裂缝与已有裂缝的相互作用机制尚不清楚。揭示了不同脉冲频率和脉冲水力压力下,裂缝对水力裂缝扩展方向的诱导规律。采用类岩石试样进行了传统水力压裂(THF)试验和脉冲水力压裂试验。在两次水力压裂试验中,我们比较了水力裂缝与预先存在裂缝之间的相互作用。分析了脉冲水力压裂过程中水力裂缝与已有裂缝相互作用的声发射特征。结果表明:类岩石试样中存在的裂缝能够诱导水力裂缝的扩展方向;在低脉冲频率下,预先存在的裂缝尖端对水力裂缝扩展的影响大于传统液压和高脉冲频率下的影响。当脉冲频率为1 Hz时,裂缝尖端容易诱发水力裂缝。随着脉冲频率的增加,水力裂缝扩展方向逐渐远离原有裂缝尖端,垂直向最小主应力方向延伸。脉冲水力载荷作用下,井筒周围产生的水力裂缝比THF作用下多,并延伸至原有裂缝;低频脉冲载荷作用下,井筒周围产生的水力裂缝比高频脉冲载荷作用下多。与传统液压相比,低脉冲频率(1 Hz和3 Hz)下的水力裂缝扩展比传统液压高脉冲频率(5 Hz)下的水力裂缝扩展更为复杂。在高脉冲水力压力和脉冲频率下,水力裂缝容易像传统水力压力下一样沿垂直于最小主应力方向扩展。研究脉动水压下水力裂缝与天然裂缝的相互作用机理,可为大规模压裂中裂缝网络系统的形成提供方法,提高压裂效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interaction between Hydraulic Fracture and Pre-Existing Fracture under Pulse Hydraulic Fracturing
Pulse hydraulic fracturing technology can greatly improve the effect of fracture propagation in rock and form complex fracture networks in reservoirs. The interaction mechanism between hydraulic fractures and pre-existing fractures under pulse hydraulic pressure is unclear. The induced laws of pre-existing fractures on the propagation direction of hydraulic fractures under different pulse frequencies and pulse hydraulic pressures are revealed in this work. We have carried out traditional hydraulic fracturing (THF) tests and pulse hydraulic fracturing tests with rock-like specimens. We compared the interaction between hydraulic fractures and pre-existing fractures in the two hydraulic fracturing tests. Acoustic emission (AE) characteristics of the interaction between hydraulic fractures and pre-existing fractures during pulse hydraulic fracturing are analyzed. The results show that pre-existing fractures in the rock-like specimen can induce the direction of propagation of hydraulic fractures. The influence of pre-existing fracture tips on hydraulic fracture propagation is greater with low pulse frequencies than with traditional hydraulic pressures and high pulse frequencies. When the pulse frequency is 1 Hz, hydraulic fractures are easily induced by pre-existing fracture tips. With increasing pulse frequency, the hydraulic fracture propagation direction gradually moves away from the pre-existing fracture tips and extends perpendicularly to the direction of the minimum principal stress. Under pulse hydraulic loading, more hydraulic fractures are generated around the wellbore than under THF and extend to the pre-existing fracture, and more hydraulic fractures around the wellbore are created with low-frequency pulse loading than with high-frequency pulse loading. Compared with traditional hydraulic pressures, hydraulic fracture propagation with low pulse frequencies (1 and 3 Hz) is more complex than hydraulic fracture propagation with traditional hydraulic pressures and high pulse frequencies (5 Hz). Under high pulse hydraulic pressure and pulse frequency, hydraulic fractures easily extend along the direction perpendicular to the direction of the minimum principal stress like propagation under traditional hydraulic pressure. The study of the interaction mechanism between hydraulic fractures and natural fractures under pulsating hydraulic pressure can provide a method for the formation of fracture network systems in large-scale fracturing and may improve the fracturing efficiency.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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