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Linear hydraulic pump and its application in well pressure control

  • US 10,533,548 B2
  • Filed: 05/03/2016
  • Issued: 01/14/2020
  • Est. Priority Date: 05/03/2016
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • a linear motor comprising a hydraulic cylinder and a fluid barrier disposed therein, the hydraulic cylinder in selective fluid communication on opposed sides of the fluid barrier with a hydraulic fluid source;

    a fluid pump functionally connected to the linear motor, a fluid inlet of the fluid pump in fluid communication with a fluid source, a fluid outlet of the fluid pump in fluid communication with a subsurface well, a fluid return conduit of the subsurface well provided outside the subsurface well;

    a pressure sensor in fluid communication with the fluid return conduit such that the pressure sensor is provided outside the subsurface well;

    a controller functionally coupled to the linear motor and the pressure sensor, wherein the controller is configured to operate the fluid pump to maintain a selected pressure in the subsurface well; and

    a proportional output solenoid valve disposed between the hydraulic fluid source and the opposed sides of the fluid barrier, the proportional output solenoid valve in signal communication with the controller to apply a proportional hydraulic pressure to one side of the fluid barrier related to a difference between a measured well fluid pressure and a selected well fluid pressure.

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