Initial Drill for Re-Entry - This 14 7/8 inch four roller cone tungsten carbide insert roller bit is used to drill the initial hole after the re-entry cone has been landed on the ocean bottom. It is used to run the 16-inch casing which is hung below the cone. Then comes the 11 3/4-inch casing necessary to prevent deep penetration holes from filling up with debris. A similar 10-inches in diameter is used to drill the remainder of the hole
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
Type
image
Subject
Deep-sea drilling ships Bits (Drilling and boring) Drilling and boring Drill cores Oceanographic research ships Deep Sea Drilling Project Glomar Challenger (Ship)
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.