WELL DRILLING DEVICE Russian patent published in 2007 - IPC E21B7/02 E21B19/08 

FIELD: well drilling equipment, particularly adapted to drill blast holes.

SUBSTANCE: device comprises transportation base with attached equipment including load-bearing frame, boring mast with movable rotator, drive, supply hydraulic cylinder, front and rear hydraulic jacks and counterweights. The counterweights are installed on inclined guiding means arranged along transportation base and may be moved by means of flexible tie member. The counterweights are connected to front hydraulic jack with flexible tie member. The flexible tie member of each counterweight is made as block-and-tackle system including movable block arranged on front hydraulic jack shaft and is parallel to device plane.

EFFECT: provision of independent chassis and supply hydraulic cylinder shifting from working position in transport position and in reverse order, which results in reduction of time necessary for attachment equipment assembling and disassembling at new well and in drilling work efficiency increase.

3 dwg