热应力对盐穴储气库稳定性的影响
发布时间：2018-11-22 08:39
【摘要】：盐腔注采周期的变化导致腔内温度周期性变化,进一步导致围岩热应力的周期性变化。由于盐岩抗拉强度低,当这种周期性热应力为拉应力且数值较大时,盐岩将破碎从而导致腔体垮塌。结合声呐带压测腔实测的盐穴腔体形状和体积数据,采用有限元数值模拟方法,将温度场与已建力学模型进行耦合建立热应力模型,并对常规模型和热应力模型进行对比,以分析热应力对腔体稳定性的影响。结果表明:在常规模型中表现稳定的部分区域,在热应力模型中却发生垮塌现象,热应力模型计算结果与声呐实测带压测腔结果吻合,由此推断温度变化所产生的热应力是影响腔体稳定性的重要因素,严重时可能导致腔体垮塌。因此,腔体热应力影响因素的提出,进一步完善了腔体稳定性评价体系,使评价结果更加接近于地层的真实情况。
[Abstract]:The variation of injection and production period in salt cavity leads to the periodic change of temperature in the cavity and the periodic change of thermal stress of surrounding rock. As the tensile strength of salt rock is low, when the periodic thermal stress is tensile stress and the value is large, the salt rock will break and lead to cavern collapse. Based on the shape and volume data of the cavity measured by sonar band pressure measurement, the thermal stress model is established by coupling the temperature field with the established mechanical model by using the finite element numerical simulation method, and the conventional model and the thermal stress model are compared. The influence of thermal stress on the stability of cavity is analyzed. The results show that in the part of the conventional model, the collapse occurs in the thermal stress model, and the calculated results of the thermal stress model are in agreement with the results of sonar measured cavity with band pressure. It is inferred that the thermal stress caused by the temperature change is an important factor affecting the stability of the cavity, which may lead to the collapse of the cavity if it is serious. Therefore, the influence factors of cavity thermal stress further improve the evaluation system of cavity stability, so that the evaluation results are closer to the real situation of formation.
【作者单位】： 中国石油西气东输管道公司储气库项目部;
【基金】：中国石油集团公司重大科技专项“地下储气库关键技术研究与应用”,2015E-40
【分类号】：TE972
本文编号：2348726
[Abstract]:The variation of injection and production period in salt cavity leads to the periodic change of temperature in the cavity and the periodic change of thermal stress of surrounding rock. As the tensile strength of salt rock is low, when the periodic thermal stress is tensile stress and the value is large, the salt rock will break and lead to cavern collapse. Based on the shape and volume data of the cavity measured by sonar band pressure measurement, the thermal stress model is established by coupling the temperature field with the established mechanical model by using the finite element numerical simulation method, and the conventional model and the thermal stress model are compared. The influence of thermal stress on the stability of cavity is analyzed. The results show that in the part of the conventional model, the collapse occurs in the thermal stress model, and the calculated results of the thermal stress model are in agreement with the results of sonar measured cavity with band pressure. It is inferred that the thermal stress caused by the temperature change is an important factor affecting the stability of the cavity, which may lead to the collapse of the cavity if it is serious. Therefore, the influence factors of cavity thermal stress further improve the evaluation system of cavity stability, so that the evaluation results are closer to the real situation of formation.
【作者单位】： 中国石油西气东输管道公司储气库项目部;
【基金】：中国石油集团公司重大科技专项“地下储气库关键技术研究与应用”,2015E-40
【分类号】：TE972
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