In-line sub for drilling equipment

Details In-line sub for drilling equipment In-line sub for drilling equipment

E - Fixed Constructions

21

B

E21B 17/07 (2006.01) E21B 21/10 (2006.01) E21B 21/12 (2006.01)

Patent

CA 2128878

2128878 9315302 PCTABS00024 An in-line sub (10) connects first and second drill pipes (11, 12) and has a sleeve (26) and mounting block (29) movable vertically relative to a body (16) along vertical or helical splines (25). In the drilling position, vibration dampener means (34) (e.g. of resilient material) isolate the first drill pipe (11) from shocks transmitted to the sub (10) by the second drill pipe (12). A spring loaded sealing plug (22) seals the central bore (18) of the body (16) when no air is flowering through the bore (18), while stabilizer fins (35) bear on the hole to locate the sub (10) therein.

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