Shell Oil Comapny

Weatherford/lamb, Inc.

Ian Alexander Millar

Douwe Johannes Runia

Paul Neilson Wood

Suresh Patel

A wellstring assembly comprising a tubular first wellstring part with a passageway; a second wellstring part co-operating with the first wellstring part; and a releasable wellstring-interconnecting means for selectively interconnecting the first and second wellstring parts; an auxiliary tool for manipulating the second wellstring part, which auxiliary tool can pass along the passageway in the first wellstring part to the second wellstring part, comprising a tool-connecting means for selectively connecting the auxiliary tool to the second wellstring part, and an operating means for operating the wellstring-interconnecting means.

Wellstring assembly

Surfaces of a downhole tool, e.g. a drill bit, a reamer shoe or a stabilizer, are protected by at least temporarily fixing a super-hard material ( ) to the surfaces of the down-hole tool, and spray fusing a binding material ( ) around the super-hard material to permanently bind the super-hard material to the down hole tool.

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Aberdeen, United Kingdom

Ian Alexander Millar