论文部分内容阅读
以松辽盆地泉头组地层作为研究地层,采用数值模拟的方法分析地层孔渗非均质性对于二氧化碳羽流地热系统的影响。结果表明:由于非均质储层中快速通道的存在,使得在井间距为1000 m,注入压力为16 MPa时,CO_2的产出时间可以由均质储层中的15个月提前到3个月;非均质储层中,CO_2流动集中,储层换热体积减小,产出流体温度下降速率加快;孔渗非均质性既可能引起产出流体温度和系统热提取速率快速下降,也可能导致系统产出流体流量减小,从而使得系统运行期间热提取速率一直偏低。
Taking the Quantou Formation in the Songliao Basin as a research stratum, the influence of formation porosity and permeability heterogeneity on the geothermal system of carbon dioxide plume was analyzed by numerical simulation. The results show that due to the existence of fast channels in heterogeneous reservoirs, the output time of CO_2 can be advanced from 15 months in homogeneous reservoirs to 3 at well spacing of 1000 m and injection pressure of 16 MPa Month; in heterogeneous reservoirs, the flow of CO 2 is concentrated and the volume of heat exchange in the reservoir is reduced, and the temperature drop rate of the produced fluid is accelerated; and the heterogeneity of the pore infiltration may cause the output fluid temperature and the system heat extraction rate to drop rapidly, It may also result in a decrease in system output fluid flow, which results in lower heat extraction rates during system operation.