(19)
(11) EP 2 647 789 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.07.2017 Bulletin 2017/30

(43) Date of publication A2:
09.10.2013 Bulletin 2013/41

(21) Application number: 13162620.2

(22) Date of filing: 05.04.2013
(51) International Patent Classification (IPC): 
E21B 33/14(2006.01)
E21B 34/12(2006.01)
 E21B 43/10(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 05.04.2012 US 201213506227

(71) Applicant: Schlumberger B.V.
2514 JG The Hague (NL)

(72) Inventors:
  • Harris, Michael J.
    Houston, TX Texas 77095 (US)
  • Stulberg, Martin Alfred
    Angleton, TX Texas 77515 (US)

(74) Representative: Beattie, Alex Thomas Stewart 
Forresters IP LLP Skygarden Erika-Mann-Strasse 11
80636 München
80636 München (DE)

   


(54) Methods and apparatus for cementing wells


(57) Return flow diverters are provided for which are adapted to allow return flow during cementing of a liner for a well. The return flow diverter comprises a cylindrical body adapted for installation in a well as part of the liner. The cylindrical body has a fluid port therein adapted to allow fluids displaced by a cementing operation to flow from an annulus between the liner and the well into the cylindrical body. The return flow diverter also comprises a cover supported on the cylindrical body for movement from an open position, in which the port is open, to a closed position, in which the port is closed by the cover, a transmission disposed within the cylindrical body and defining a cylindrical passageway adapted to accommodate a tubular conduit.







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