New development in sea-bottom sampling

Journal Article · Thu Oct 01 00:00:00 EDT 1970 · Ocean Ind.; (United States)

OSTI ID:5239079

Conrad-Stork and the Dutch Geological Survey Department have developed Geodoff II, the latest of their units designed for remote-control drilling of the upper 50 m of the sea floor and for recovering undisturbed samples. The new drilling method is a combination of 2 different penetration methods; i.e., pressure penetration and ordinary rotary drilling. The new unit has the advantage over other methods for obtaining undisturbed samples of being able to penetrate hard formations efficiently. The Geodoff II can operate at any water depth on the continental shelf completely independent of the ship. No assistance from skin divers is required. The main body with its 3 legs emplaced on the sea bottom, contains the rotary drilling device and a rotating supply disk on which the complete drill string is placed in 12 lengths of about 4 m each. The electric motor driving the hydraulic pumps, the computer, etc., are housed in the drums on the main body. An umbilical cord from the surface vessel supplies electric power, electric signals, and drilling mud. The filled core barrels are stored by mechanical arms after every pipe length of drilling progress. The tubes are placed on the supply disk in special clamps. By omitting the core barrels and connecting the rotary drilling device with the ship by means of a hose, a continuous flow of samples can be obtained by the counterflush system.

• OSTI ID: 5239079
• Journal Information: Ocean Ind.; (United States), Vol. 5:10
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
CORING EQUIPMENT
DESIGN
NATURAL GAS DEPOSITS
EXPLORATION
PETROLEUM DEPOSITS
AUTOMATION
COMPUTERS
CONTINENTAL SHELF
DEPTH
DRILL CORES
DRILLING FLUIDS
ELECTRIC MOTORS
ELECTRIC POWER
EQUIPMENT INTERFACES
FASTENERS
FASTENING
GEOLOGIC FORMATIONS
HARDNESS
HYDRAULICS
OFFSHORE OPERATIONS
PIPES
PRESSURE CONTROL
PUMPS
RECOVERY
ROTARY DRILLS
SAMPLERS
SEA BED
SHIPS
SIZE
TUBES
UNDERWATER OPERATIONS
CONTINENTAL MARGIN
CONTROL
DIMENSIONS
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FABRICATION
FLUID MECHANICS
FLUIDS
GEOLOGIC DEPOSITS
JOINING
LABORATORY EQUIPMENT
MECHANICAL PROPERTIES
MECHANICS
MINERAL RESOURCES
MOTORS
POWER
RESOURCES
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
020300 - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing