(19)
(11) EP 0 921 268 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.02.2002 Bulletin 2002/06

(43) Date of publication A2:
09.06.1999 Bulletin 1999/23

(21) Application number: 98203702.0

(22) Date of filing: 02.11.1998
(51) International Patent Classification (IPC)7: E21B 37/04, F28G 3/10, F28G 3/16
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 08.12.1997 US 67944 P
29.07.1998 US 123968

(71) Applicants:
  • SOFITECH N.V.
    1180 Bruxelles (BE)

    DE DK GB IT NL 
  • COMPAGNIE DES SERVICES DOWELL SCHLUMBERGER
    92541 Montrouge Cédex (FR)

    FR 

(72) Inventors:
  • Eslinger, David
    Broken Arrow, Oklahoma 74014 (US)
  • Leising, Lawrence
    Sugar Land, Texas 77479 (US)

(74) Representative: Menès, Catherine 
Etudes et Productions Schlumberger Service Propriété Intellectuelle 1, rue Henri Becquerel
92142 Clamart Cédex
92142 Clamart Cédex (FR)

   


(54) Apparatus for cleaning well tubular members


(57) A downhole cleaning tool (20) is suspended within a well tubular member (10) by coiled tubing (12) for the removal of deposits (29) within the tubular member (10). Tool (20) includes a hydraulic fluid motor (26) for rotating a combined fluid jetting and milling head (28). Fluid jetting and milling head (28) has a tapered body with a lower rounded nose (60). Embedded milling inserts or elements (62, 64) project outwardly from the tapered body and nose (60) to contact the deposit and are randomly spaced on head (28). A plurality of upper radial jets (70) extend above milling elements (62). Lower fluid jets or ports (78) extend from the lower rounded nose (60) of head (28). Power fluid from the coiled tubing (12) is divided at port (38) to the rotor bore (34) into a bypass fluid stream flowing through central bore (34) and a fluid power stream in annular passage (39) outside rotor (32) for rotation of rotor (32) and shaft (27) to rotate the fluid jetting and milling head (28).






Search report