(19)
(11) EP 3 135 860 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.05.2017 Bulletin 2017/21

(43) Date of publication A2:
01.03.2017 Bulletin 2017/09

(21) Application number: 16183126.8

(22) Date of filing: 05.08.2016
(51) International Patent Classification (IPC): 
E21B 43/12(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
Designated Validation States:
MA MD

(30) Priority: 05.08.2015 WO PCT/US2015/043694
02.12.2015 US 201514956863
02.12.2015 US 201514956527
02.12.2015 US 201514956545
02.12.2015 US 201514956601

(71) Applicants:
  • Weatherford Technology Holdings, LLC
    Houston, TX 77056 (US)
  • Amfields, LP
    Houston, TX 77073 (US)

(72) Inventors:
  • ROBISON, Clark E.
    Houston, TX Texas TX 77041 (US)
  • SCHMITT, Kenneth J.
    Spring, TX Texas TX 77379 (US)

(74) Representative: Hagmann-Smith, Martin P. 
Marks & Clerk LLP Fletcher House Heatley Road The Oxford Science Park
Oxford OX4 4GE
Oxford OX4 4GE (GB)

   


(54) PUMPING SYSTEM AND METHOD


(57) A hydraulic pumping system can include an actuator including a piston rod that displaces in response to pressure in the actuator, a seal assembly that seals about the piston rod and is exposed to the pressure in the actuator, and another seal assembly that seals about the piston rod, is exposed to pressure in a well and includes multiple separate seal cartridges, each of the seal cartridges including a dynamic seal that slidingly and sealingly engages the piston rod. Another hydraulic pumping system can include an actuator including a piston rod that displaces in response to pressure in the actuator, a seal assembly that seals about the piston rod and is exposed to the pressure in the actuator, and another seal assembly that seals about the piston rod, is exposed to pressure in a well and includes a labyrinth ring comprising multiple ring layers.







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Search report