(19)
(11) EP 3 128 123 A3

(12) EUROPEAN PATENT APPLICATION

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

(43) Date of publication A2:
08.02.2017 Bulletin 2017/06

(21) Application number: 16183114.4

(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 201514956545
02.12.2015 US 201514956527
02.12.2015 US 201514956601
02.12.2015 US 201514956863

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

(72) Inventors:
  • SCHMITT, Kenneth J.
    Houston, TX Texas TX 77041 (US)
  • ROBISON, Clark E.
    Houston, TX Texas TX 77041 (US)
  • MCDONALD, Robert G.
    Shenandoah, TX Texas TX 77385 (US)
  • TRAPANI, James. S
    Houston, TX Texas TX 77056 (US)
  • THOMAS, Benson
    Katy, TX Texas TX 77493 (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 a hydraulic actuator with a magnet that displaces with a piston, and a sensor that continuously detects a position of the magnet. A ferromagnetic wall of the hydraulic actuator is positioned between the magnet and the sensor. A hydraulic pumping method can include incrementally lowering a lower stroke extent of a rod string reciprocation over multiple reciprocation cycles of the rod string, and automatically varying the lower stroke extent or an upper stroke extent of the rod string reciprocation, in response to a measured vibration. Another hydraulic pumping method can include solving a wave equation in the rod string, and automatically varying a reciprocation speed of the rod string in response to a change in work performed during reciprocation cycles of the hydraulic actuator or a change in detected force versus displacement in different reciprocation cycles of the hydraulic actuator.







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