Completar frases Drilling Rig1Versión en línea Main components of a drilling line por Tatiana Yaikina 1 derrick block floor engines drilling block Crown Travelling One is the major blocks of the drilling line is a , the construction on four legs standing at the corners of the substructure and reaching to the crown block . is located at the top point of the derrick . moves up or down in the derrick . The heart of the drilling rig is located on a . The drilling line is put into operation by .
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