DEVICE FOR SIMULTANEOUS DRILLING AND FIXING OF WELL TROUBLE ZONES Russian patent published in 2024 - IPC E21B7/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to drilling of oil and gas wells with simultaneous isolation of caving and landslide zones during drilling with expandable pipe string. Device for simultaneous drilling and fixation of well trouble zones includes a removable expandable bit fixed in a working position with a shear element with the possibility of being transferred into a transport position when the ball is seated in the rod seat and creating excess pressure, casing multibeam expandable pipes with the possibility of their straightening by excess pressure with fixation relative to the well walls, lowered with the possibility of disconnection from the drill string on the landing sub equipped with a groove with a cone for narrowing of the cylindrical end of the upper casing multibeam pipe and pins inserted into the profile part of the upper casing multibeam pipe. Housing of the expandable bit is equipped with a hydraulic chamber in which a piston is installed, which is connected to the rod of the expandable bit with a radial hole. Threaded bushing is equipped with flushing hole with diameter, which allows simultaneous flushing and expansion of shaped pipes. Retractable expandable bit is connected to the lower sub, equipped with a groove with cone for narrowing of cylindrical end of lower casing multibeam pipe and pins inserted into the shaped part of the lower casing multibeam pipe. Landing sub is equipped from below with a guide bushing with a chamfer and a central hole, which is equipped with stop rings for grooves of the lower sub. Lower sub is equipped with a groove with a stop ring, which is fixed in the inner groove of the cylindrical end of the lower casing multibeam pipe when the lower sub is moved downwards. Lower sub in the central channel is equipped with a seat for a ball of a larger size than the ball for the seat of the rod of the retractable expandable bit.

EFFECT: ruled out emergencies related to expandable bit detachment, ruled out formation of non-expanded sections.

1 cl, 4 dwg