Oceanic crust is created at mid-ocean ridges where magma is continuously supplied from the mantle below. To better understand this process, geologists require continuous core samples through the ridges and associated geologic structures. To date the Ocean Drilling Program (ODP) has had very little success establishing permanent reentry boreholes on the mid-ocean ridges using conventional rotary drilling techniques. This paper describes ODP's development of a unique percussion drill bottom-hole assembly (BHA) using a water powered hammer drill for the purpose of drilling-in casing on the mid-ocean ridges. Current plans are to deploy this system from the drill ship JOIDES Resolution (formerly Sedco/BP 471) in April 1998 on the Southwest Indian Ridge in the Indian Ocean.
Drilling casing into fractured hard rock formations in deep water using a water powered hammer drill
1998
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Conference paper
Storage medium
English
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