稀盐酸解堵工艺及其在提高注液井流量中的应用

The application of plugging removal process with diluted hydrochloric acid for improving the flowrate of injection wells

摘要: 我国砂岩型铀矿床渗透性普遍偏低，因此，地浸矿山多呈现出抽注液能力差、生产能力低、浸出周期长等特点。在某砂岩型铀矿床开展的地浸采铀试验中，多个注液井的注液量出现明显下降，影响试验的正常运行。为解决上述问题，利用稀盐酸作为解堵试剂，开展稀盐酸解堵工艺的研究。室内试验的结果表明，注酸后岩芯渗透率较之前上升128%。将该工艺应用至现场试验,结果显示，经稀盐酸解堵工艺处理后，注液井的注液量提升55%～117%，取得了显著效果。

Abstract: Low production capacity and long leaching life are very common characteristics in ISL mines due to low permeability of sandstone-type uranium deposits in China.During the in-situ leaching field test, the flowrate of some injection wells decrease rapidly, which adversely affect the operation.In order to solve the problems, plugging removal process with diluted hydrochloric acid is adopted because of its many advantages.During the laboratory experiment, it is shown that the core sample specific permeability increases by 128% after it is treated with 2 g/L hydrochloric acid.The application of this process has achieved good effect and the flowrate of injection wells increase by from 55% to 117%.