Verfahren zum Zurueckholen mindestens eines Teils einer Unterwasser-Produktionsbohrlochkopfbaugruppe zur Wasseroberflaeche

• Main Author: HENRY PETERSEN,WILLIAM
• Format: Patent
• Language: German
• Published: 04.12.1969
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

1,256,314. Wells &c. SHELL INTERNATIONAL RESEARCH MAATSCHAPPIJ N.V. 22 May, 1969 [24 May, 1968], No. 26208/69. Heading E1F. A production wellhead assembly 25 forming part of a subaqueous wellhead structure 18 is retrieved by lowering retrieval means 34 and means 35 carrying guidelines 42, 43 int...