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高温地热生产井碳酸钙结垢定量评价：水文地球化学
雷宏武, 白冰, 崔银祥, 谢迎春, 李进, 侯学文
PDF(1980 KB)
PDF(1980 KB)
高温地热生产井碳酸钙结垢定量评价：水文地球化学
Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Hydrogeochemistry
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高温地热井井筒结垢是地热开发遇到的突出问题之一，其中涉及到复杂的水文地球化学过程.本文首先联合井筒两相流动、水‒气‒结垢物水文地球化学和井壁粘附模型，建立了井筒碳酸钙结垢定量评价的耦合模型.针对西藏羊八井地热田典型井开展了井口取样和分析，结果显示井筒结垢物为碳酸钙，地热流体中碳酸盐矿物过饱和，非凝结气体主要成分是CO2.利用建立的耦合模型及实测流体数据，定量评价了井筒碳酸钙的结垢位置和速率，并给出了其在井筒中的结垢形状.CO2分压对碳酸钙的析出有控制性的作用，最大结垢厚度位置发生在闪蒸面以上10~20 m位置，持续1年的开采最大结垢厚度在考虑井筒粘附动力学时为14~25 mm，假设完全粘附条件下为200 mm.流体中CO2含量越高，结垢厚度也越大.
Wellbore scaling in high temperature geothermal fields is one of the prominent problems encountered in geothermal development, which involves complex hydrogeochemical processes. In this paper, a coupling model for quantitative assessment of wellbore scaling, including two-phase flow, hydrogeochemical reactions among water-gas-scaling minerals and wellbore adhesion, was established. The wellhead sampling for water, gas and mineral was carried out in typical geothermal wells in the Yangbajing geothermal field. The analysis results show that calcite is the dominant scaling-formed mineral. The geothermal fluid is supersaturated with respect to carbonate minerals. CO2 is the main non-condensable gas in the fluid. Finally, this paper evaluates the location and rate of calcite scaling based on the established model and measured fluid results. The results show that CO2 partial pressure has controlling effect on the precipitation of calcite. The maximum scaling thickness with 14-25 mm occurs 10-20 m above the flash depth for one-year production. Under the assumption that all the precipitation of calcite adheres to the wellbore wall, the scaling thickness is about 200 mm. The high CO2 content in the fluid results in greater thickness of scaling.
高温地热 / 井筒结垢 / 碳酸钙 / 水文地球化学 / 定量评价 / 水文地质学
high-temperature geothermal / wellbore scaling / calcite / hydrogeochemistry / quantitative assessment / hydrogeology
P314 / P641 / P592
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