空气潜孔锤钻进技术在沉积岩地热深井中的应用

Application of air DTH hammer drilling technology in sedimentary rock deep geothermal wells

摘要:

目前采用空气潜孔锤钻进技术的沉积岩地热钻井深度多在1000 m左右，地层深度越大，空气潜孔锤钻进的难度也会随之增大。在辽宁康平某地热井应用空气潜孔锤技术钻进，实现了沉积岩地热井深度的突破，钻井深度达到2250 m。全井采用空气钻进技术施工，通过选择合适的工作风压和风量，以期促进对该技术在沉积岩地热深井中的推广应用。

关键词:空气潜孔锤钻进;沉积岩;地热深井;地层出水量

Abstract:

At present， the depth of sedimentary rock geothermal drilling using air down-the-hole hammer technology is mostly about 1000m. The greater the formation depth， the more difficult it is to drill with air down-the-hole hammer. A geothermal well in Kangping， Liaoning Province， was drilled using air down-the-hole hammer technology to achieve a breakthrough in the depth of geothermal wells in sedimentary rocks， with a drilling depth of 2250m. Air drilling technology is adopted for the construction of the whole well， and proper working air pressure and air volume are selected to promote the popularization and application of this technology in deep geothermal wells in sedimentary rocks.

Key words:air DTH hammer drilling;sedimentary rock;deep geothermal well;formation water yield