(19)
(11) EP 2 378 058 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.10.2012 Bulletin 2012/44

(43) Date of publication A2:
19.10.2011 Bulletin 2011/42

(21) Application number: 11159183.0

(22) Date of filing: 22.03.2011
(51) International Patent Classification (IPC): 
E21B 43/08(2006.01)
 E21B 47/09(2012.01)
(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: 15.04.2010 GB 201006306

(71) Applicant: Read Cased Hole Limited
Offshore Technology Park Bridge of Don Aberdeenshire AB23 8GW (GB)

(72) Inventors:
  • Aitken, James
    Aberdeen, Aberdeenshire AB11 7TU (GB)
  • Stewart, David
    Aberdeen, AB15 5ES (GB)

(74) Representative: Watson, Craig Simon 
Murgitroyd & Company Scotland House 165-169 Scotland Street
Glasgow G5 8PL
Glasgow G5 8PL (GB)

   


(54) Monitoring sand screen


(57) A method to monitor the integrity of a sand screen normally comprising: (i) directing at least one electromagnetic wave towards a sand screen under controlled conditions outside of a borehole; (ii)detecting at least one reflected or emitted electromagnetic wave from said sand screen in step (i) in order to produce at least one data measurement then (a) directing at least one electromagnetic wave towards the sand screen inside a borehole; and (b) detecting at least one reflected or emitted electromagnetic wave from said sand screen inside the borehole in order to produce at least one data measurement. The method normally emits and detects alternating magnetic fields/waves using an electromagnetic logging tool and can surprisingly provide useful data on the condition of sand screens in a borehole.







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Search report