摘要
渤南坳陷沙河街组页岩油储量丰富,但开发难度大。提高水力裂缝穿层能力,形成纵向三维立体改造区域是有效开发该类油藏的关键。在调研国内外数值模拟方法的基础上,基于cohesive有限元数值模拟手段,通过ABAQUS数值模拟软件建立了三维水力压裂模型,定量分析了储层岩石杨氏模量、层理面胶结强度以及泵注排量对裂缝穿层能力的影响。研究结果表明:1)随储层杨氏模量增加,水力裂缝展布范围和裂缝穿层比呈增加趋势;2)裂缝穿层比随层理面胶结强度增加呈现反向波动曲线,当胶结强度处于波峰位置时可获得较大穿层比;3)泵注排量对裂缝穿层效果贡献有限,随排量增加穿层比先增加后趋于平稳。以上成果对地质和工程相关因素进行了敏感性分析,为页岩油藏水平井体积压裂优化决策提供了重要理论基础。
There are abundant shale oil reserves in Bonan Depression,but they are difficult to exploit.The key to effectively developing this kind of reservoir is to improve the layer-crossing ability of hydraulic fractures and form a vertical three-dimensional reconstruction area.In this paper,the author investigated the numerical simulation methods in China and abroad,established a three-dimensional hydraulic fracturing model by ABAQUS numerical simulation software based on the cohesive finite element numerical simulation method,and quantitatively analyzed the influence of Young’s modulus of reservoir rock,the cement strength of bedding plane and pumping displacement on fracture layer-crossing ability.The results show that:1)The propagation range and layer-crossing ratio of hydraulic fracture increase with the increase of Young’s modulus;2)The layer-crossing ratio fluctuates with the rise in the cement strength of the bedding plane and a larger penetration ratio can be obtained when the cementation strength is at the peak position;3)The contribution of pumping displacement to the fracture layer-crossing effect is limited,and the hydraulic fracture layer-crossing ratio increases first and then tends to be stable with the increase of displacement.In this paper,the author analyzed the sensitivity of the geological and engineering factors,providing an essential theoretical basis for optimizing horizontal wells in shale reservoir volume fracturing.
作者
张伟强
ZHANG Weiqiang(Drilling Technology Research Institute,Sinopec Shengli Oilfield Service Corporation,Shandong Dongying 257000,China)
出处
《非常规油气》
2024年第2期140-146,共7页
Unconventional Oil & Gas
基金
2023年度山东省博士后创新项目“难钻地层多维载荷破岩井底耦合动态研究”(SDCX-ZG-202301017)。
作者简介
张伟强(1996-),男,硕士研究生,助理工程师,主要从事新工艺技术研发、新工具试验及岩石力学研究等工作。E-mail:zhangwq86806.ossl@sinopec.com。
