崔国栋,任韶然,张亮,庄园,王延永,宫智武,苏帅杰

• 1:中国石油大学(华东)石油工程学院油藏工程系

摘要(Abstract)：

针对超临界CO_2(SCCO_2)开采地热过程中的渗流特征和可能产生的储层伤害,基于热力学原理和地化反应机理,建立了考虑地层水蒸发、CO_2-地层水-岩石地化反应、盐沉淀/溶解和储层孔渗变化的SCCO_2地热开采综合模型,分析了流体渗流特征和岩石-流体作用对采热速率的影响,并提出了提高SCCO_2采热速率的相应方法。研究结果表明,干燥SCCO_2持续注入会加剧地层水蒸发,造成注入井附近地层水饱和度梯度增加,使得气液毛管力大于驱替压差情况,导致地层水回流。地层水回流加剧了地化反应和盐析对注入井区域的伤害,使得SCCO_2渗流速度和采热速率降低。敏感性分析表明,储层温度、压力、孔隙度、渗透率和注采压差均会影响SCCO_2采热速率,其中地层水矿化度是影响储层盐析及采热速率降低的最重要因素。注SCCO_2前预注低矿化度水可有效缓解盐析对储层的伤害。

关键词(KeyWords)： 超临界二氧化碳;地层水回流;地化反应;地热开采;蒸发盐析;采热速率

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51674282);; 山东省自然科学青年基金(ZR2013EEQ032);; 青岛市科技计划项目产学研合作引导计划(13-1-4-254-jch);; 中央高校基本科研业务费专项资金(15CX05036A)

作者(Author): 崔国栋,任韶然,张亮,庄园,王延永,宫智武,苏帅杰

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