Application of Drilling Deviation Correcting and Deflecting Techniques in Geological Exploration at Songta Hydropower Station

Abstract:

This article introduces the special application of drilling deviation correcting and deflecting techniques in dealing with drilling troubles in Songta hydropower station. The deviation correcting technology was used to ensure hole verticality when drilling construction was obstacled by casing deflection caused by uneven hardness in deep overburden riverbed; the deflecting technology was used to eliminate the effects casused by drill rod burying to keep drilling construction going on. These techniques have worked well in the drilling in deep overburden and broken layers and have development and application values.

Key words:drilling deviation correction; drilling deflecting; drill rod burying; riverbed overburden; broken rocks