Development of small-sized turbo drill and its use in drilling of directional geological exploration holes

Turbo drilling is a conventional drilling method in oil and gas drilling and it has been used for many years in Russia and is being studied and used in geological exploration drilling of China. However it is not enough to develop and use the small-sized turbo drill in directional drilling in China. In Russia the small-sized turbo drill(its diameter 70mm and length 650mm) has been developed and used in drilling of geological exploration holes successfully and good technical and economical results obtained. That deserves our attention.