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- W13306676 abstract "In addition to scientific discoveries, the Deep Sea Drilling Project continues to produce outstanding innovations in drilling technology and incredible operating statistics. Among the routine operational procedures are the following: (1) dynamic positioning in deep water; (2) drilling and coring regularly in water depth ranging to 20,000 ft; (3) bottom penetrations as deep as 3,900 ft without casing; and (4) hole re-entry in deep water. These accomplishments have helped expand the horizon of exploratory drilling for ocean resources. Three years ago, the offshore oil industry limited its drilling activities to a few hundred feet of water. Today, the industry drills in 1,500-ft water, and industry spokesmen say oil and gas wells can be drilled safely in water depths ranging to 2,000 ft. One of the project's most persistent problems has been to devise a means of penetrating chert. Newly designed tungsten carbide-insert roller-type bits were utilized on Leg 17. During this leg, 8 sites (10 holes) were drilled, using a total of 7 tungsten carbide insert bits. Total penetration was 10,662 ft. The chert layers were successfully penetrated in all sites and samples of the basement basalt recovered at all sites. The dynamic positioning is being reviewed to determine themore » minimum water depth capabilities.« less" @default.
- W13306676 created "2016-06-24" @default.
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- W13306676 date "1971-09-01" @default.
- W13306676 modified "2023-09-23" @default.
- W13306676 title "Glomar challenger: three years at sea" @default.
- W13306676 hasPublicationYear "1971" @default.
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