油页岩原位开采井距影响数值模拟研究

Study on the influence of well spacing in oil shale in-situ production by numerical simulation

摘要:

近年来，随着我国能源消费水平的提高，油气资源进口量逐年上升，寻找替代能源逐渐受到世界各国关注。油页岩是一种重要的石油替代能源，其储量巨大，分布广泛，开采前景广阔。地下原位转化开采油页岩具有低污染、占地面积小的优点。本文采用CMG-STARS数值模拟软件建立油页岩地下原位开采模型，通过原位注入热蒸汽法模拟了油页岩地下原位转化过程中的产油动态，并分析不同井距对开采的影响。结果表明，井距对油页岩开采有重要影响，井距越大，油页岩长期开采效果越好，但短期开采效果越差。最后对井距进行敏感性分析，结果表明井距40 m左右时产油效果最好。

Abstract:

In recent years， with the rise of energy consumption in China， the import volume of oil and gas resources has increased rapidly. The search for alternative energy sources has gradually attracted attention all over the world. Oil shale is an important alternative energy source for petroleum： huge reserves， wide distribution and broad prospects for exploitation. At present， the main mining methods of oil shale include surface dry distillation and underground in-situ conversion. Because surface dry distillation requires large factories， covers a large area， and pollutes the environment， underground in-situ conversion is valued. G-STARS numerical simulation software was used to establish an oil shale underground in-situ mining model for simulation of the oil production dynamics in the process of underground in-situ conversion of oil shale， and for analysis of the influence of different reservoir reconstruction parameters. The results showed that well spacing has an important impact on oil shale production. The larger the well spacing， the better the long-term exploitation effect of oil shale， but the worse the short-term exploitation effect. The higher fracture permeability only increases the cumulative oil production in the early stage， and has little effect on long-term exploitation.