STABILISATION METHOD OF DRILLING DIRECTION, DEVICE FOR STABILISATION OF DRILLING DIRECTION AND DRILLING UNIT Russian patent published in 2009 - IPC E21B7/00 

FIELD: mining engineering.

SUBSTANCE: group of inventions relate to mining engineering, particularly to method of stabilisation of drilling direction, device of stabilisation of drilling and drilling unit, and can be used for special-purpose wells construction. Stabilisation of drilling direction while drilling by double pipe string for the method is achieved ensured by loading during the drilling process by external and internal pipe string with ability of expansion of one of strings and compression of the other, for the device - thanks to its outfitting by reference ring, installed on leading end of external string, allowing width, providing ability of support in it of inner string butt, and for drilling unit - ensured by installation of support on leading end of external string in the form of ring, allowing width, providing ability of support in it of inner string butt, and implementation of rotation spindle of inner pipe string with ability of axial movement relative to rotator of external pipe string, herewith spindle is outfitted by motor assembly with axial movement drive.

EFFECT: it provides drilling of straight wells, including in incompetent rocks, by means of double pipe string and expansion of devices range for stabilisation of drilling direction.

3 cl, 6 dwg, 1 ex