Mechanics of effective destruction of rocks by chain-drilling bits rollingcutter von O. M. Davydenko, A. O. Ihnatov

Volltext

Ground frequency spectrum device for treatment of drilling fluid in drilling wells von O. M. Davydenko, O. F. Kamyshatskyi

Volltext

Estimation of properties of the activated washings liquids von O. M. Davydenko, A. O. Ihnatov, M. O. Naumenko

Volltext

A study of the state of column is at cementation of bore holes von O. M. Davydenko, A. O. Ihnatov, M. O. Naumenko

Volltext

A device is for the directed boring drilling von O. M. Davydenko, A. O. Ihnatov, M. O. Naumenko

Volltext