Browse

A mechanism of core blocking that is drilled out during the coring from deep wells in the direct and indirect flushing with drilling mud is examined. Using methods of technical mechanics and hydromechanics, a formula for flow rate excluding a core blocking is obtained during the backwashing. The value of necessary flow rate depends on not only a direction and intensity of fracturing of rocks, geometrical and density parameters of core pieces, but also on structural strength of drilling mud. A mechanism of core sel...

Drilling by the submersible drilling hammer is one of the progressive technologies in drilling of boreholes and it is currently being widely applied method for the drilling works. Use of the submersible hammers disposed in the borehole - drilling directly above the drilling tool - entails number of advantages. The most important is the energy loss prevention. Submersible drilling hammers are gradually and successfully replacing the surface hammers, which have been widely used for many years in Slovakia and in the ...