围压及孔隙度与致密砂岩强度参数相关性研究
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西南石油大学石油与天然气工程学院

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TE21

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四川省青年科技创新研究团队专项计划(2019JDT0026)


Research on the correlation between confining pressure, porosity and strength parameters of dense sandstone
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School of Petroleum and Natural Gas Engineering, Southwest Petroleum University

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    摘要:

    在油气勘探开发过程中常面临岩石力学参数难以准确获取的困境。以室内三轴试验数据为基础,建立非均质砂岩岩心模型,采用控制变量法原则,分析力学参数随围压和孔隙度的变化规律,并通过灰色关联模型定量分析其关系,利用多元回归方法拟合最优模型并绘制出力学参数图版。结果表明:抗压强度随围压近似呈线性增长,围压从15MPa增至90MPa时,抗压强度增大了86.5%,弹性模量随围压增大而增大,泊松比整体波动稳定;抗压强度、弹性模量和泊松比随孔隙度增大而减小,弹性模量和泊松比波动较小;随着围压增大,试样抵抗变形能力增强,剪切裂纹比例增多;根据灰色关联分析结果,其中围压与抗压强度关联度最好,力学参数与围压和孔隙度拟合程度较好。探究围压和孔隙度对力学参数影响规律及定量表征方法,能更好指导致密砂岩油气层的勘探与开发。

    Abstract:

    In the process of oil and gas exploration and development, it is often difficult to obtain rock mechanics parameters accurately. Based on the laboratory triaxial test data, a heterogeneous sandstone core model was established. The rule of control variable method was adopted to analyze the variation of mechanical parameters with confining pressure and porosity, and the relationship was quantitatively analyzed by grey correlation model. Multiple regression method was used to fit the optimal model and draw the mechanical parameter chart. The results show that the compressive strength increases linearly with the confining pressure. When the confining pressure increases from 15MPa to 90MPa, the compressive strength increases by 86.5%, the elastic modulus increases with the confining pressure increasing, and Poisson"s ratio fluctuates steadily. The compressive strength, elastic modulus and Poisson"s ratio decrease with the increase of porosity, and the fluctuation of elastic modulus and Poisson"s ratio is small. With the increase of confining pressure, the deformation resistance of the specimen increases, and the proportion of shear cracks increases. According to the results of grey correlation analysis, the correlation between confining pressure and compressive strength is the best, and the fitting degree between mechanical parameters and confining pressure and porosity is better. Exploring the influence of confining pressure and porosity on mechanical parameters and quantitative characterization methods can better guide the exploration and development of tight sandstone oil and gas reservoirs.

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吴雪锋,李皋,杨旭,等. 围压及孔隙度与致密砂岩强度参数相关性研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-08-19
  • 最后修改日期:2024-01-21
  • 录用日期:2024-01-26
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