Patent ID: 9004197
Filing Date: 2015-04-14
Classification: E21B

Abstract:
1. A rotary drill stem component for exploration of a hydrocarbon well with drilling mud in movement around the component from a bottom of the well towards a surface, the component comprising: a central tubular element having an axis of revolution and extended on either side respectively by a first and a second tool joint each respectively and successively comprising a first cylindrical portion connected to the tubular element, a second tapered portion, a third cylindrical portion with a radius which is greater than that of the tubular element, and a threaded end which can connect the component to another component, the component comprising a shell with one or more functional zones, wherein the shell is mounted on one of the tool joints in a cohesive and removable manner, wherein the shell is screwed against the tapered second portion of one of the tool joints using screws accommodated in housings formed in the shell and in the tapered portion and coaxial therewith, and wherein the shell is fixed against the second tapered portion of one of the tool joints using at least one pin passing through the shell, the pin being fixed at one of its ends in a recess formed in the tool joint and by a nut screwed onto the other end of the pin.