(19)
(11) EP 0 188 343 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.08.1987 Bulletin 1987/32

(43) Date of publication A2:
23.07.1986 Bulletin 1986/30

(21) Application number: 86300163

(22) Date of filing: 13.01.1986
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 18.01.1985 GB 8501256

(71) Applicant: STABLE SERVICES LIMITED
 ()

(72) Inventor:
  • Stewart, Arthur
     ()

   


(54) Stabilising tool


(57) O A stabiliser tool for connection in a drill string having a fluted stabilising portion comprising a body part (16) integral with the shank (10) of the tool and a leading end sleeve part or cap (18) removably secured to the shank. The cap (18) can readily by replaced when worn. The tool may be suppled as a set including different interchangeable caps having for example, spiral flutes (22) for normal stabilising operation, or straight flutes to enable the tool to be used as a reamer when drilling rough and abrasive rock formations.






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