METHOD FOR VERTICAL WELL DRILLING Russian patent published in 2006 - IPC E21B7/04 

FIELD: mining industry, particularly to drill vertical freezing holes with the use of movable or stationary installations provided with movable rotators and hydraulic directional supply means.

SUBSTANCE: method involves predrilling strictly vertical well 14; stabilizing vertical direction with the use of centrators, calibrators and heavy-weight bottomhole assembly made of pipes by aligning thereof with well 14 axis; manually or automatically regulating vertical position of rotator 4 travel in continuous mode with the use of support adjustable jacks 2 by retaining drilling rig 13 frame in horizontal position. The frame position is controlled in two perpendicular planes by means of level sensor installed on frame 1 or mast 1 or rotator 4. Drilling is performed with extended drilling string under axial load equal to not more than 80% of heavy-weight bottomhole assembly weight.

EFFECT: increased productivity and efficiency of drilling stabilization process, possibility to drill strictly vertical wells.

3 cl, 2 dwg, 1 tbl