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PQplot calculates inflow performance relationship IPR and vertical lift performance VLP curves for oil and gas wells.

pengtools PQplot

Typical applications

  • Estimation of flow rates and AOF
  • Selection of tubing size
  • Selection of flowline size
  • Selection of the operating wellhead pressures
  • Estimation of the effects of reservoir pressure depletion
  • Identification of flow restrictions

Main features

  • Plot of Inflow performance curve IPR and Vertical lift performance curve VLP
  • Rate and pressure at intersection point
  • Sensitivity analysis of IPR and VLP curves on parameters
  • Using prepared PVT models
  • Inclined wells calculations
  • Tubing, annular and both flow types

Interface features

  • Save and share references to saved models with colleagues
  • Last saved model on current computer and browser is automatically opened
  • Choose between Metric units and US oilfield units
  • Save as image and print plot by means of chart context menu (button at the upper-right corner of chart)
  • Download report in pdf format containing input parameters, calculated values and plot
  • Select and copy results to Excel or other application


Type of problem Correlation Reference

Oil well VLP

Hagedorn and Brown + Griffith

Hagedorn, A. R., & Brown, K. E. (1965). Experimental study of pressure gradients occurring during continuous two-phase flow in small-diameter vertical conduits. Journal of Petroleum Technology, 17(04), 475-484.

Gas well VLP


Gray, H. E. (1974). Vertical flow correlation in gas wells. User manual for API14B, subsurface controlled safety valve sizing computer program.

Dry gas VLP


Cullender, M.H. and Smith, R.V. 1956. Practical Solution of Gas-Flow Equations for Wells and Pipelines with Large Temperature Gradients. Trans., AIME 207: 281.

Oil well inflow

Composite IPR based – Vogel equations taking into account water

Kermit E. Brown "The Technology of Artificial Lift Methods" Vol. 4 Production Optimization of Oil and Gas Wells by Nodal System Analysis, p. 30, section 2.227.1

Gas well inflow – backpressure equation

Rawlins and Schellhardt

Rawlins, E.L. and Schellhardt, M.A. 1935. Backpressure Data on Natural Gas Wells and Their Application to Production Practices, Vol. 7. Monograph Series, USBM.

Gas well inflow – pseudo-pressure equation using Jd and kh values

Real-gas pseudopressure equation

See for example: Ahmed, T., & McKinney, P. (2011). Advanced reservoir engineering. Gulf Professional Publishing.

Liquid loading


Turner, R. G., Hubbard, M. G., and Dukler, A. E. (1969) “Analysis and Prediction of Minimum Flow Rate for the Continuous Removal of Liquids from Gas Wells,” Journal of Petroleum Technology, Nov. 1969. pp. 1475–1482.

Erosional velocity

Guidelines from API RP14E

Mokhatab S, Poe WA, Speight JG (2006) "Handbook of Natural Gas Transmission and Processing", Section 11.6 - Design Considerations on sales gas pipelines, subsection 11.6.1 - Line Sizing Criteria, Elsevier, 2006.

PVT correlations are the same as in PVT tool.