• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Workshop on Geothermal Reservoir Engineering >Modeling of Calcite Scaling and Estimation of Gas Breakout Depth in a Geothermal Well by Using PHREEQC
【24h】

Modeling of Calcite Scaling and Estimation of Gas Breakout Depth in a Geothermal Well by Using PHREEQC

机译：用Phreeqc使用Phreeqc的地热井中方解石缩放和估计气体突破深度的建模

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Calcite scaling is widely encountered in geothermal wells and it has to be inhibited since it prevents production. As a result of a pressure drop, thermal fluids start to boil and degas of CO_2 while fluids rise in a wellbore. Thermal fluid becomes saturated to calcite as a result of both CO_2 exsolution and concentration increase of calcium and carbonates as a consequence of boiling. When the first gas bubble is formed, CO_2 exsolution affects the ph and also carbonate species. In order to prevent calcite scaling effectively, inhibitor must be injected into the wellbore at a depth below gas breakout point where thermal fluid is still in liquid phase. Thermal fluid transforms from 100% liquid to both liquid and gas phases at the gas breakout depth when the sum of partial pressures of water vapor and non-condensable gases exceed the wellbore pressure under flowing conditions. There are a lot of ways to predict the gas breakout depth in geothermal wellbores. One of them, the easiest but primitive, is dynamic PT survey evaluation. This method is common in industry but limited with applicable flow rate. Therefore determining gas breakout depth from dynamic pressure profile is not sensitive. In this study, major chemical analysis of brines, in situ measurements (pH, CO_2/H_2O ratios), steam fractions at sampling conditions, dynamic wellbore temperature and pressure data were used to compute gas breakout depth in a well at Kizildere geothermal field. All calculations were performed with thermodynamic approach by using PHREEQC software.
机译：在地热井中广泛遇到的方解石缩放，因为它妨碍了它防止生产。由于压降，热流体开始沸腾和CO_2的脱气，而流体在井筒中升高。由于沸腾的结果，由于CO_2的钙和碳酸钙和碳酸钙的浓度增加，热流体变得饱和至方解石。当形成第一气泡时，CO_2 exsolution会影响pH和碳酸盐物种。为了有效地预防方解石缩放，必须在低于气体突破点的深度下将抑制剂注入井筒中，其中热流体仍然在液相中。当水蒸气和不可冷凝气体的部分压力之和超过流动条件下的井眼压力超过井眼压力时，热流体从100％液体转变为气体突出深度的液体和气相。有很多方法可以预测地热井中的气体突破深度。其中一个是最简单但原始的，是动态PT调查评估。这种方法在工业中很常见，但具有适用的流速限制。因此，从动态压力曲线确定气体突破深度是不敏感的。在本研究中，盐水的主要化学分析，原位测量（pH，CO_2 / H_2O比），采样条件下的蒸汽馏分，动态井筒温度和压力数据用于计算Kizildere地热场的井中的气体突破深度。使用Phreeqc软件进行热力学方法进行所有计算。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号