热采环境泥岩层应力演化规律及破坏机理研究
发布时间：2018-09-06 19:33
【摘要】：深入认识热采环境下泥岩层的应力演化规律及破坏机理,有助于科学有效地解决稠油藏注汽过程中的盖层破裂问题及隔夹层遮挡问题。首先,从理论上定量研究了热采油藏泥岩层的传热、增压机制,分析了变温、变压条件下泥岩层不同的应力演化规律及破坏模式;然后,针对一加拿大热采项目的盖层破坏事件,开展了泥岩盖层热-水-应力全耦合数值模拟研究,揭示了热采环境下泥岩层的破坏机理及关键影响因素。结果表明,热采环境中泥岩层应力演化主要受热增压影响;孔隙压力远高于注汽压力,峰值位于孔隙水最大热压力系数所对应的温度附近;孔隙压力峰值附近岩层可能发生拉伸破坏和剪切破坏。热采油藏合理注汽方案的制定必须充分考虑泥岩层的热-水-应力耦合效应。
[Abstract]:It is helpful to understand the stress evolution law and failure mechanism of mudstone bed in thermal recovery environment, which is helpful to solve the problem of caprock fracture and intercalation barrier effectively in the process of heavy oil reservoir steam injection. Firstly, the heat transfer and pressurization mechanism of the mudstone layer in thermal oil recovery reservoir is quantitatively studied theoretically, and the different stress evolution laws and failure modes of the mudstone layer under the condition of varying temperature and pressure are analyzed. In view of the caprock failure event of a Canadian thermal mining project, a numerical simulation study on the thermal-water-stress coupling of mudstone caprock is carried out, which reveals the failure mechanism and key influencing factors of mudstone strata under thermal mining environment. The results show that the stress evolution of mudstone in thermal recovery environment is mainly affected by thermal pressure, the pore pressure is much higher than steam injection pressure, and the peak value lies near the temperature corresponding to the maximum thermal pressure coefficient of pore water. Tensile failure and shear failure may occur near the peak pore pressure. The thermal-water-stress coupling effect of mudstone must be taken into account in the formulation of rational steam injection scheme for thermal recovery reservoir.
【作者单位】： 中国石油大学(华东)石油工程学院;山东大学(威海)机电与信息工程学院;
【基金】：国家自然科学基金(51304230) 中央高校基本科研业务费专项(14CX02104A) 山西省重点实验室基金(14-080100-03)
【分类号】：TE357.44
本文编号：2227334
[Abstract]:It is helpful to understand the stress evolution law and failure mechanism of mudstone bed in thermal recovery environment, which is helpful to solve the problem of caprock fracture and intercalation barrier effectively in the process of heavy oil reservoir steam injection. Firstly, the heat transfer and pressurization mechanism of the mudstone layer in thermal oil recovery reservoir is quantitatively studied theoretically, and the different stress evolution laws and failure modes of the mudstone layer under the condition of varying temperature and pressure are analyzed. In view of the caprock failure event of a Canadian thermal mining project, a numerical simulation study on the thermal-water-stress coupling of mudstone caprock is carried out, which reveals the failure mechanism and key influencing factors of mudstone strata under thermal mining environment. The results show that the stress evolution of mudstone in thermal recovery environment is mainly affected by thermal pressure, the pore pressure is much higher than steam injection pressure, and the peak value lies near the temperature corresponding to the maximum thermal pressure coefficient of pore water. Tensile failure and shear failure may occur near the peak pore pressure. The thermal-water-stress coupling effect of mudstone must be taken into account in the formulation of rational steam injection scheme for thermal recovery reservoir.
【作者单位】： 中国石油大学(华东)石油工程学院;山东大学(威海)机电与信息工程学院;
【基金】：国家自然科学基金(51304230) 中央高校基本科研业务费专项(14CX02104A) 山西省重点实验室基金(14-080100-03)
【分类号】：TE357.44
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