Analysis Tools

PC-PUMP® offers a wide variety of analysis tools to evaluate and measure the performance of your downhole system. In addition to ensuring the pump is adequately sized for pressure and volume, the software checks rod loads to ensure the rods have sufficient strength for the application, calculates side loading, assesses tubing wear and estimates fatigue life.

Important calculated variables include:

  • Pump intake and discharge pressures
  • Pump pressure loading (as % of rated pressure)
  • Hydrostatic head and flow losses
  • Maximum rod torque and axial load
  • Effective rod stress (as % of yield)
  • Maximum rod/tubing contact load
  • Energy costs and system efficiency
  • System input power & prime mover output power

A series of advanced windows are also available to provide more detailed information.

Energy Flow

Displays efficiency and energy consumed of each component of the system. Also displayed is the breakdown of the pressure, torque and power loads on the pump into wellhead pressure, hydrostatic head, flow losses and friction torque.

Drive Equipment

Displays the loading (torque, power, speed, axial load) and other output quantities (e.g. current, motor temperature) relevant to either surface or downhole drive equipment.

Basic Fluid Flow

Displays graphs of the casing and tubing pressure profiles, the pressure components (i.e., hydrostatic head vs. flow loss), the flow losses (as caused by the rod body and by any guides or couplings) and the fluid temperature and effective viscosity.

Rod Loads and Deflections

Displays in graph form the torque, axial load, effective stress, torque breakdown, deflection and rotation versus the measured depth. Also displayed are any space-out requirements from rod stretching due to axial load and thermal expansion.

Rod/Tubing Contact

Displays in graph form contact loads, distributed loads, load breakdown, rod/tubing contact locations and rod guide/tubing contact locations versus measured depth.

Multiphase Flow

Displays in graph form insitu flow rates, free and solution gas, flow patterns and volume of pipe occupied by a liquid versus measured depth.

Key Locations

The key locations table shows the following parameters at important locations in the well.

 

Measured Depth Oil Rate Vertical Depth
Water Rate Temperature Free Gas Rate
Viscosity Free Gas Percent Pressure
Solution GOR Total Fluid Rate

Rod/Tubing Wear

PC-PUMP® can display the rod/tubing wear rates based on the specified system. PC-PUMP® provides the ability to vary the contact materials along the rod string and to display the wear rate as a function of measured depth.

Rod Fatigue

The Rod Fatigue module gives the user the ability to model the effects of lower-frequency production fluctuations (e.g. gas or water slugging). A sensitivity analysis is provided for lower frequency fluctuations, since it can be difficult to know how much the loads will vary during slugging.

Backspin Analysis

The Backspin module can calculate the response of the system to two major types of rod backspin situations: normal shutdown and seized pump. The brake response can also be calculated if a brake curve is provided by the user.

Sand Settling

A sand settling module is available to calculate the minimum flow velocity (setting velocity) to prevent sand from settling back down the well. In most cases, it is recommended that the fluid velocity in the tubing is significantly higher than the settling velocity.

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