地热回灌井井底压强新解

New Arithmetic on Evaluating the Intensity of Pressure on the Bottom of Geothermal Reinjection Well

摘要:

前人对地热回灌井的井底压强评价主要通过水位和井内水温、密度分布进行相对静态计算。为了更客观地研究井底压强计算，该文进行了更全面的分析。当在对模拟地热回灌井的尾水出水口压力进行计算时，发现了尾水对下部水柱产生13.07m水柱当量压强，并结合估计的回灌平衡状态下井内温度（密度）分布，计算出井底压强及其他相关数据，并与静井状态进行了对比，认为在回灌井结构不变的前提下，井底的压强主要由尾水出水口压力、动水位和温度（密度）分布共同决定。

Abstract:

The pressure on the bottom of geothermal reinjection well have been evaluated by predecessors through relative static calculation on water table, water temperature and density. In this paper, comprehensive analysis has been carried out in order to study the calculation of the pressure on the bottom of the well. While calculating the pressure of the outlet of tail water in a simulated reinjection well, the intensity of pressure equivalent of 13.07m water bar caused by tail water stream to the lower water bar has been discovered. The temperature (along with density) distribution of geothermal water in the well at different depth has been estamited while the well was steady with reinjection, and the pressure from the bottom and other relevant data have been gained as well. After the data comparison between the original steady well and balanced reinjection well, it is showed that in the same framework of reinjection well, the intensity of pressure on the bottom mainly determined by the tail water stream pressure at the outlet of reinjection pipe, the height of dynamic water table and the distribution of water temperature (along with density) in the well.