(19)
(11) EP 3 135 859 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.05.2017 Bulletin 2017/22

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

(21) Application number: 16183123.5

(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 201514956601
02.12.2015 US 201514956527
02.12.2015 US 201514956545
02.12.2015 US 201514956863

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

(72) Inventors:
  • LEMBCKE, Jeffrey J.
    Houston, TX Texas TX 77041 (US)
  • ROBISON, Clark E.
    Houston, TX Texas TX 77041 (US)
  • SCHMITT, Kenneth J.
    Houston, 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 pumping method can include displacing a rod string with pressure applied to an actuator by a pressure source including an accumulator and a separate gas volume in communication with the accumulator. A sensor indicates whether a fluid is in the gas volume. A pumping system can include an actuator, a pump connected between the actuator and an accumulator, a hydraulic fluid contacting a gas in the accumulator, a separate gas volume in communication with the accumulator, and a sensor that detects the hydraulic fluid in the gas volume. Another pumping system can include an actuator, a pump connected between the actuator and an accumulator that receives nitrogen gas from a nitrogen concentrator assembly while a hydraulic fluid flows between the pump and the actuator, a separate gas volume in communication with the accumulator, and a sensor that detects a presence of the hydraulic fluid in the gas volume.







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