WELL DRILLING RIG Russian patent published in 2005 - IPC

FIELD: well drilling equipment, particularly for drilling water, oil and gas wells.

SUBSTANCE: drilling rig includes drilling string located above reamer, borer with body and flushing channel. Centralizer is installed at a distance exceeding half-wave length drilling string flexure during drilling process. Centralizer is made as hinged spring-loaded blades with centering diameter corresponding to well diameter in transport position and to expanded borehole part diameter in working position. Reamer has eccentrically located rock cutting blades. Borer body is made as limiting step and is provided with stabilizing members secured to the body from side of rock-cutting blades.

EFFECT: simplified structure, increased efficiency and operational stability.

2 cl, 1 dwg