SET OF TOOLS FOR MULTI-STAGE DRILLING OF UPWARD BOREHOLES Russian patent published in 2024 - IPC E21B7/00 E21D3/00 

FIELD: mining.

SUBSTANCE: invention relates to mining industry, namely to a set of tools with reamers of forward and reverse stroke for multi-stage drilling of uprising wells in the range of inclination of their axes to horizon from 45 to 90 degrees. Set comprises auger starting bit with sectional sucker-rod drill string for the design length of the advanced degassing well, intermediate support lights of the sectional sucker-rod drilling assembly, a reduction gear with an oval-rhombic body and four support-centring skis, forward stroke reamer, multibeam stepped reverse stroke reamer with disc tool and rear support lamp. At that, the forward stroke reamer is made in the form of two — left upper and right lower — multibeam parallel-axial crowns-reamers, each of which contains radial beams with cutters and a starting bit. Intermediate support lights have three radial beams, two of which contain support-centring skis, and the third is made in the form of a bracket, has a U-shaped detachable connection made of two parts of different length. First part of smaller length is attached to the shell of the bearing assembly. Second part of greater length comprises two U-shaped lugs, a pin with a threaded joint and a branching of three support beams with support-centring skis.

EFFECT: enabling increase in the efficiency of the process of multi-stage drilling of uprising wells, preliminary advanced degassing and simplification of the process of spudding of forward and backward reamers, as well as restoration of natural degassing in steeply dipping coal beds.

1 cl, 5 dwg