E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B10/00—Drill bits
E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
E21B10/325—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being shifted by a spring mechanism
Landscapes
Engineering & Computer Science
(AREA)
Life Sciences & Earth Sciences
(AREA)
Geology
(AREA)
Mining & Mineral Resources
(AREA)
Mechanical Engineering
(AREA)
Physics & Mathematics
(AREA)
Environmental & Geological Engineering
(AREA)
Fluid Mechanics
(AREA)
General Life Sciences & Earth Sciences
(AREA)
Geochemistry & Mineralogy
(AREA)
Perforating, Stamping-Out Or Severing By Means Other Than Cutting
(AREA)
Mandrin a poche laterale, son procede de fabrication, procede pour joindre deux elements tubulaires coaxiaux par une soudure circonferentielle, et ensemble a clapet de retenue de type a cartouche