ข้อมูลAutomatic 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 E21B0019200000; controlling pressure or flow of drilling fluid E21B0021080000); Systems specially adapted for monitoring a plurality of drilling variables or conditions (means for transmitting measuring-signals from the well to the surface E21B0047120000)

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