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  1. 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.

    • Collection: Scripps Institution of Oceanography Photographs
    • Name: L.W. Walsh; Deep Sea Drilling Project; Glomar Challenger (Ship)
    • Date: 1973
    • Topic: Ships--Dynamic positioning systems; Oceanographic research ships; Deep-sea drilling ships
    • Format: image
  2. Dynamic Positioning-Re-entry Consoles. Senior Scientist Oscar E. Weser, of the Deep Sea Drilling Project, handles the manual control levers of the dynamic positioning system aboard D/V Glomar Challenger. The bridge photograph also shows the dynamic positioning console (center) and the re-entry console on the right. Both are used during actual re-entry of a bore hole on the ocean floor

    • Collection: Scripps Institution of Oceanography Photographs
    • Name: Deep Sea Drilling Project; Glomar Challenger (Ship); Deep Sea Drilling Project; Weser,Oscar E.
    • Topic: Deep Sea Drilling Project; Oceanographic research ships; Ships--Dynamic positioning systems; Deep-sea drilling ships
    • Format: image
  3. Motion Instrumentation Control - One of the many modifications made on D/V Glomar Challenger while in drydock before starting Leg 26 of the Deep Sea Drilling Project was the installation of a new vessel motion instrumentation control on the bridge. The dynamic postioning automatic controls are shown at left.

    • Collection: Scripps Institution of Oceanography Photographs
    • Name: Deep Sea Drilling Project; Glomar Challenger (Ship); Deep Sea Drilling Project
    • Date: 1972
    • Topic: Oceanographic research ships; Deep-sea drilling ships; Ships--Dynamic positioning systems; Deep Sea Drilling Project
    • Format: image
  4. Stroked Out Position-The Heave Compensator aboard D/V Glomar challenger is shown in a partially stoked out position. The lower lifting block and piston rod supports the full weight of th drill string and the upper cylinder portion is linked to the traveling block. The system is designed to improve core and extend bit life by eliminating the movement and bottom pounding of the drill string due to vessel heave. This is accomplished by maintaining a constand hydraulic supporting under the piston as the compensating cylinder heaves with the vessel. Maximum working load is 600,000 pounds and maximum heave compensated 15 feet. Load variation at 400,000 pounds (plus or minus) 2,500 pounds.

    • Collection: Scripps Institution of Oceanography Photographs
    • Name: Deep Sea Drilling Project; Deep Sea Drilling Project; Glomar Challenger (Ship)
    • Topic: Ships--Dynamic positioning systems; Drilling and boring; Oceanographic research ships; Deep-sea drilling ships
    • Format: image
  5. Dynamic Positioning-Drawing shows how the Deep sea drilling Project ship, Glomar Challenger, remains on station while working in water depths up to 20,000 feet. Dynamic positioning usersa computerized system of pulses from acoustic beacons on the ocean floor which are picked up by a ship mounted hydrophone array, fed into a computer, and translated into corrective action by propulsion units (tunnel thrusters and ship propellers) which automatically keep the Challenger precisely on station. The drawing also shows the flexibility of the drill string which weighs 400,000 pounds at a water depth of 20,000 feet.

    • Collection: Scripps Institution of Oceanography Photographs
    • Name: Deep Sea Drilling Project; Glomar Challenger (Ship); Deep Sea Drilling Project
    • Topic: Deep-sea drilling ships; Ships--Dynamic positioning systems; Oceanographic research ships
    • Format: image