Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting (portable drilling rigs for use on underwater floors Fulltext... Hierarchy... Expanded...E21B 7/12) [1,7]
Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens, or liners Fulltext... Hierarchy... Expanded...E21B 43/02)
Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits [6,8]
Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows (perforators Fulltext... Hierarchy... Expanded...E21B 43/11); Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
Arrangements for separating materials produced by the well (separating apparatus per se, see the relevant subclasses) [3]
E21B 44/00
Automatic control; Surveying or testing [3]
P:160
E21B 44/00
Automatic 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, e.g. computer-controlled drilling systems (for non-automatic drilling control, see the operation controlled; automatic feeding from rack and connecting of drilling pipes Fulltext... Hierarchy... Expanded...E21B 19/00; controlling pressure or flow of drilling fluid Fulltext... Hierarchy... Expanded...E21B 21/00); Systems specially adapted for monitoring a plurality of drilling variables or conditions (means for transmitting measuring-signals from the well to the surface Fulltext... Hierarchy... Expanded...E21B 47/12) [3]
E21B 45/00 - E21B 49/00
Surveying or testing
P:170
E21B 45/00
Measuring the drilling time or rate of penetration
Means for transmitting measuring-signals from the well to the surface, e.g. for logging while drilling (remote signalling in general Fulltext... Hierarchy... Expanded...G08)