Advancing Pump Technology Corp.

Surface Rod Driven

Top Drive Rod-Driven RGP System

RD RGPThe Rod Driven Rotary Gear Pump (RD-RGP) Systemis similar in configuration design and operation to the more common progressive cavity pump (PCP) in that the downhole positive displacement rotary gear pump is driven by a surface top drive system connected by a rod string. The rotation of the rods by means of an electric or hydraulic motor at surface causes the fluid contained in the gear pump to flow upward. In comparison to a conventional downhole beam pump which provides reciprocating pump action, the functional performance and features of the rod driven RGP pump are significantly different.

Listed are the operating features and advantages of the gear pump over both PCP and other reciprocating rod-lift systems

  1. Gear pump speed a function of top drive …… maximum safe surface speed of 450 RPM
  2. Lift head abilities up to 10,000 ft
  3. Rates up to 1000 bbls/d achievable
  4. Reduced surface installation capital costs
  5. Wide API operating range: 10 - 50º+ API
  6. No elastomers, not impacted by wellbore aromatics
  7. Eliminate fiberglass rods and “rod fall” issues
  8. Ability to handle high gas fractions and low concentrations of sand
  9. Operating scenarios to increase surface rates Q (bbl/d):
    1. Addition of RGP stages (volume by staging)
    2. Increase top drive speed
    3. Tubing or Insertable pump options

Critical Factors must be considered when designing a RD-RGP lift system for a particular well. In determining the required number of downhole stages, rod string design and surface HP requirements, the following factors include:

  • Upper and lower desired production rates (IPR curve)
  • Size of casing and tubing string
  • Rotational speed of the downhole gear pump
  • Strength and size of the rod / COROD string
  • Rod & Pump torque
  • Well depth and viscosity of produced fluids

RD-RGP Pump Curves

RD RGP 10 Stage