DEVICE AND METHOD ROTARY-PRESSURE DRILLING OF WELLS Russian patent published in 2009 - IPC E21B4/02 

FIELD: oil-and-gas industry.

SUBSTANCE: group of inventions relates to field of drilling of oil and gas wells. Device contains drill column with heavy-weight drill pipes, spindle with casing, hollow shaft with openings and consolidations, and centering elements. Between drill column and casing of spindle it is built in additional casing, inside of which it is co-axially located torsion bar, connected to spindle shaft, and in the top part it is built-in top cross bar, in which there are implemented opening for passage of flushing fluid and jack, and also bottom cross bar with openings for passage of flushing fluid through it and central faceted hole, in which it is located faceted part of torsion bar. Between top cross bar and top part of torsion bar it is installed top compression spring. In additional body on torsion bar it is put on from one to three parallel and/or successively operating for springs compression with its bearing on plate with openings for passage of flushing fluid and on bead in bottom part of torsion bar. Over mentioned springs it is installed ring and branch for adjustment of value of pressed springs. Nearby inner wall of additional casing on plate and on bead in bottom part of torsion bar there are installed one or two springs, operating parallel or successively compression to each other and/or jointly with springs, installed on torsion bar. Bottom end of torsion bar is implemented threaded or with slits.

EFFECT: rise of mechanical rate of well driving and driving on plugged bit by means of effectiveness increase of influence upon armament of plugged bit on rock at bottomhole of well, increasing of action period of the device and plugged bit.

2 cl, 1 dwg