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| 岩石力学参数对致密砂岩水力压裂缝扩展影响研究 |
| Study on the Influence of Rock Mechanical Properties on Hydraulic Fracture Propagation in Tight Sandstone |
| 投稿时间：2024-11-30 修订日期：2025-01-17 |
| DOI： |
| 中文关键词: 致密砂岩储层 水力压裂 裂缝扩展 破裂压力 数值模拟 |
| 英文关键词:Tight reservoir Hydraulic fracturing Crack propagation Rupture pressure numerical simulation |
| 基金项目:国家自然科学基金项目(42272153, 41972138) ；中国石油塔里木油田分公司揭榜挂帅项目（671023060003） 中国石油天然气集团有限公司科技项目（2023ZZ16YJ02, 2023ZZ16YJ04） |
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| 中文摘要: |
| 准噶尔盆地永进地区齐古组储层埋藏深、储层致密、渗透率低，需要通过压裂改造才能形成工业油流，而厘清岩石的物理力学性质、压裂裂缝扩展影响因素，有助于提高致密油气开发效率。为此，开展了岩石力学实验，研究了基于损伤模型的致密砂岩水力压裂缝扩展力学机理。研究结果表明，稳定扩展压力随着弹性模量的上升而略微上升，水力压裂缝延伸长度随着弹性模量的增大而增大，但水力压裂缝宽度随着弹性模量增大而减小；稳定扩展压力与破裂压力随着泊松比的增大而减小，水力裂缝的宽度也随着泊松比的增大而减小，但泊松比的影响远低于弹性模量的影响；注液点峰值压力和稳定扩展压力均随着抗拉强度的增大而增大；水力压裂缝的宽度也随着岩石抗拉强度的增大而增大。 |
| 英文摘要: |
| The reservoir in the Qigu Formation of the Yongjin area, Junggar Basin, is characterized by deep burial, high density, and low permeability, which necessitates hydraulic fracturing to enable industrial-scale oil production. Understanding the physical and mechanical properties of the rock, as well as the factors influencing fracture propagation, is crucial for improving the efficiency of tight oil and gas development. Therefore, the mechanical mechanisms of hydraulic fracture propagation in tight sandstone are investigated in this study through rock mechanics experiments based on a damage model. The results show that the stable propagation pressure increases slightly with the increase of elastic modulus, and the extension length of hydraulic fracture increases with the increase of elastic modulus, but the width of hydraulic fracture decreases with the increase of elastic modulus. The stable propagation pressure and fracture pressure decrease with the increase of Poisson 's ratio, and the width of hydraulic fracture decreases with the increase of Poisson 's ratio, but the influence of Poisson 's ratio is much lower than that of elastic modulus. The peak pressure of the liquid injection point and the stable expansion pressure increase with the increase of tensile strength. The width of hydraulic fracture also increases with the increase of rock tensile strength. |
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