EARTH DRILLING

EFIXED CONSTRUCTIONS E21Mining

E21BEARTH DRILLING

E21B1/00Percussion drilling E21B10/00Drill bits E21B11/00Other drilling tools E21B12/00Accessories for drilling tools E21B15/00Derricks Masts; Other supports E21B17/00Drilling rods or pipes Flexible drill strings Kellies Drill collars Sucker rods; Cables Casings Tubings E21B19/00Handling rods, casings, tubes or the like outside the borehole E21B21/00Methods or apparatus for flushing boreholes E21B23/00Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells E21B25/00Apparatus for obtaining or removing undisturbed cores E21B27/00Containers for collecting or depositing substances in boreholes or wells E21B28/00Vibration generating arrangements for boreholes or wells E21B29/00Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells E21B3/00Rotary drilling E21B31/00Fishing for or freeing objects in boreholes or wells E21B33/00Sealing or packing boreholes or wells E21B34/00Valve arrangements for boreholes or wells E21B35/00Methods or apparatus for preventing or extinguishing fires E21B36/00Heating, cooling, insulating arrangements for boreholes or wells E21B37/00Methods or apparatus for cleaning boreholes or wells E21B4/00Drives used in the borehole E21B40/00Tubing catchers, automatically arresting the fall of oil-well tubing E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00 E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells E21B44/00Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator E21B45/00Measuring the drilling time or rate of penetration E21B47/00Survey of boreholes or wells E21B49/00Testing the nature of borehole walls Formation testing Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells E21B6/00Drives for combined percussion and rotary drilling E21B7/00Special methods or apparatus for drilling