(19)
(11) EP 1 944 464 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.01.2009 Bulletin 2009/04

(43) Date of publication A2:
16.07.2008 Bulletin 2008/29

(21) Application number: 08250049.7

(22) Date of filing: 07.01.2008
(51) International Patent Classification (IPC): 
E21B 21/06(2006.01)
C08L 101/14(2006.01)
 B01D 17/02(2006.01)
C09K 8/24(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 09.01.2007 US 621558

(71) Applicant: M-I L.L.C.
Houston, TX 77072 (US)

(72) Inventor:
  • Tehrani, Ahmadi
    Banchory Kincardineshire AB31 5ZN (GB)

(74) Representative: Gill, Stephen Charles et al
Mewburn Ellis LLP 33 Gutter Lane
London EC2V 8AS
London EC2V 8AS (GB)

   


(54) Method for reducing aqueous content of oil-based fluids


(57) A method for reducing the aqueous content of oil-based drilling fluid includes contacting an invert emulsion wellbore fluid with a water absorbing polymer, interacting the water absorbing polymer with the wellbore fluid for a sufficient period of time so that the water absorbing polymer absorbs at least a portion of the aqueous fluid form the wellbore fluid; and separating the water absorbing polymer containing the absorbed water from the wellbore fluid.







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