Bottenventilsaggregat för en sänkborr

• Main Authors: TIMOTHY J PLUNKETT, PAUL CAMPBELL, JING JAMES YAO, WILLIAM H DELL II, DALE R WOLFER
• Format: Patent
• Language: Swedish
• Published: 10.09.2012
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING