Aiming at analyzing the well construction and brine extracting process in 10# well pair,the gain and loss of this process is studied for reference for future use in similar wells and the recycling scheme on the basis of the status quo of 10# well pair i.

Bypassing the cavity bottom of Chang 5# Well,bore hole of Chang 5# Well successfully butts old cavity of Chang 1# Well and realizes brine extraction,which enhances the output and quality of brine by a large margin and increase ore recovery rate.

In drilling of directional-butted brine extraction well,saturated brine(edible salt)is not only the important guarantee for increasing the extraction rate of rock salt core and ensuring the quality of well struc-ture but also the safeguard against drilling accident in well caused by the oversize diameter in rock salt stra-tum.

This paper introduces the technological characteristics of casing mending and patching technology and analyzes casing accidents in brine well of rock salt mines.