摘要
以天津滨海新区塘沽地区(533km2)馆陶组孔隙性地层为研究重点,建立地热热储概念模型和数学模型。利用TOUGH2软件拟合研究区内地热井的历史数据,模拟结果与监测数据吻合较好。在此基础上,进一步研究在60%和100%回灌率下,采灌井距从700m减至250m时地热流体的温度和压力变化。结果表明:随着井距的逐渐减小,开采井压力略有上升;当采灌井的间距由700m逐步减小至500m时,地热流体温度无明显变化;而当井距进一步缩小至250m时,发生热突破,地热流体温度在3～5a后出现明显下降。因此,综合考虑对井回灌压力补偿作用和温度场的影响,提出孔隙型热储地热采灌井的间距不宜小于500m。
Conceptual and mathematical models for the porous geothermal reservoir with the study area of533km2 in Tanggu Tianjin Binhai Area were established. History matching simulations for 2 years were carried out using TOUGH2. The results fit well with the measured data. Based on this observation, reservoir pressures and tempera- tures were further studied with the doublet well distances ranging from 700m to 250m under reinjection of 60% and 100% of the separated water, respectively. The results indicated that the pressure of production wells increases slightly with decreasing doublet well distances. However, as would be obvious, the reservoir temperature do not change when the well distance varied from 700m to 500m. The reservoir temperature got visibly changed because of thermal breakthrough occurs, was the well distance is further decreased to 250m. Therefore, it could be concluded that well distance should not be less than 500m so as to avoid thermal breakthrough.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第1期56-62,共7页
Acta Energiae Solaris Sinica
基金
国家高技术研究发展(863)计划(2006AA05Z425)
关键词
地热回灌
压力补偿
井距
温度场
压力场
geothermal reinjection
pressure compensation
well distance
temperature field
pressure field
