(19)
(11) EP 4 807 132 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.10.2026 Bulletin 2026/43

(43) Date of publication A2:
16.09.2026 Bulletin 2026/38

(21) Application number: 26194985.3

(22) Date of filing: 11.08.2021
(51) International Patent Classification (IPC): 
E21B 43/12(2006.01)
 E21B 34/08(2006.01)
(52) Cooperative Patent Classification (CPC):
E21B 34/08; E21B 43/12
(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

(62) Application number of the earlier application in accordance with Art. 76 EPC:
25216401.7 / 4671491
21762028.5 / 4384688

(71) Applicant: Swellfix UK Limited
Kingshill Commercial Park Westhill Aberdeenshire AB32 6FQ (GB)

(72) Inventors:
  • VOLL, Benn
    40778 Hundvaag (NO)
  • BROWN, Jonathan
    AB15 6AB Aberdeen (GB)
  • ANDERSON, James
    AB32 6FQ Nigg (GB)
  • BRODIE, Charles
    AB32 6FQ Aberdeenshire (GB)
  • GAIZEVSKIS, Tomas
    AB32 6FQ Aberdeenshire (GB)
  • SUSSEX, Nathan
    AB39 2DS Stonehaven (GB)

(74) Representative: Marks & Clerk LLP 
15 Fetter Lane
London EC4A 1BW
London EC4A 1BW (GB)

   


(54) FLOW CONTROL DEVICE


(57) Disclosed is a pilot pressure system, comprising a flow path comprising a first inlet and a first outlet, wherein the flow path is configured to create a specific pressure drop between the first inlet and first outlet based upon one or more characteristics of a fluid flowing within the flow path. The pilot pressure system further comprises a pilot pressure line, the pilot pressure line comprising a second inlet and a second outlet, wherein the second inlet is configured to allow the pilot control line to be in pressure communication with the flow path, and the second outlet of the pilot control line is configured to be connected to a sealed pilot pressure chamber of a downhole flow control device.







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