# Category: PQplot

## Brief

** PQplot software** is the core **petroleum engineering** engine of the pengtools.

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

** PQplot software** is available online at www.pengtools.com and in AppStore for iPad.

## Typical applications

- Calculating the Nodal Analysis
^{[1]}model of the well - Matching the Nodal Analysis model to the well test data
- Calculating and exporting the IPR curves: Vogel's IPR, Composite IPR
- Calculating and exporting the VLP tables to Excel or reservoir simulator
- Estimation of well's Production Potential and absolute open flow (AOF)
- Tubing sizing
- Selection of the operating wellhead pressures
- Estimation of the effects of reservoir pressure depletion
- Sensitivity studies

## Main features

- Multiphase flow correlations
- Plot of Inflow performance curve IPR and Vertical lift performance curve VLP
- Rate and pressure at intersection point
- Tubing, annular and tubing+annular flow types
- "Default values" button resets input values to the default values
- Switch between Metric and Field units
- Save/load models to the files and to the user’s cloud
- Share models to the public cloud or by using model’s link
- Export pdf report containing input parameters, calculated values and plots of the PQplot
- Continue your work from where you stopped: last saved model will be automatically opened
- Download the chart as an image or data and print (upper-right corner chart’s button)
- Export results table to Excel or other application

## Demo

The demo is a copy of a training seminar. This video demonstrates basic functionality of the PVT Software and ** PQplot software**. It is shown how to create the well nodal analysis model, run sensitivity, save the model.

In this demo we are solving the homework where it was asked to:

- Calculate the flowing bottomhole pressure.
- Construct VLP curve
- Construct IPR and calculate AOF
- Calculate current production efficiency (production/AOF)
- What is the production potential and what actions do you propose to close the performance gap?
- What will be production increment from the proposed actions?

PVT model at www.pengtools.com

PQplot model at www.pengtools.com

## Correlations

Type of problem | Correlation | Reference |
---|---|---|

Oil well VLP |
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 IPR |
Composite IPR – Vogel's IPR based 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 IPR – 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 IPR – 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. |

Turner |
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. | |

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 software.

## References

- ↑ Mach, Joe; Proano, Eduardo; E. Brown, Kermit (1979). "A Nodal Approach For Applying Systems Analysis To The Flowing And Artificial Lift Oil Or Gas Well" (SPE-8025-MS). Society of Petroleum Engineers.

## Pages in category "PQplot"

The following 11 pages are in this category, out of 11 total.