Image / Dynamic Positioning and Re-Entry. Schematic diagram showing general arrangements allowing positioning of …

Dynamic Positioning and Re-Entry. Schematic diagram showing general arrangements allowing positioning of the drilling vessel in deep water and technique of drill hole re-entry. The re-entry cone, on the sea floor, is 16 ft. in diameter and is mounted on steel casing in the upper part of the borehole, where it is inserted as the initial borehole is started. When the casing and core are fully in place, the assembly is detached from the drill string and the hole is drilled deeper. To change a bit, for example, the drill string is recovered to the ship, the bit is changed, and then again lowered to just above the cone. The vessel is moved as necessary to position the bit directly above the cone, as seen by side scanning sonar, at which time re-entry is made by lowering the pipe

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Title: Dynamic Positioning and Re-Entry. Schematic diagram showing general arrangements allowing positioning of the drilling vessel in deep water and technique of drill hole re-entry. The re-entry cone, on the sea floor, is 16 ft. in diameter and is mounted on steel casing in the upper part of the borehole, where it is inserted as the initial borehole is started. When the casing and core are fully in place, the assembly is detached from the drill string and the hole is drilled deeper. To change a bit, for example, the drill string is recovered to the ship, the bit is changed, and then again lowered to just above the cone. The vessel is moved as necessary to position the bit directly above the cone, as seen by side scanning sonar, at which time re-entry is made by lowering the pipe
Creator: L.W. Walsh
Date Created and/or Issued: 1973
Contributing Institution: UC San Diego, Special Collections and Archives
Collection: Scripps Institution of Oceanography Photographs
Rights Information: Under copyright
Constraint(s) on Use: This work is protected by the U.S. Copyright Law (Title 17, U.S.C.). Use of this work beyond that allowed by "fair use" requires written permission of the UC Regents. Permission may be obtained from the UC San Diego Library program having custody of the work. Responsibility for obtaining permissions and any use and distribution of this work rests exclusively with the user and not the UC San Diego Library.
Use: This work is available from the UC San Diego Library. This digital copy of the work is intended to support research, teaching, and private study.
Rights Holder and Contact: UC Regents
Description: Special Collections & Archives, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/sca)
This digital image is a surrogate of an item from the SIO Deep Sea Drilling Project Records, 1961-1987
Negative in same folder
Type: image
Subject: Ships--Dynamic positioning systems
Oceanographic research ships
Deep-sea drilling ships
Deep Sea Drilling Project
Glomar Challenger (Ship)

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