Intermittent Gas Lift Optimization and Design Program (GLIP)

Two-Pen chart analysis Transient inflow performance prediction Inflow performance prediction Sensitivity analysis Several design options: Spacing factor Percent load Opti-flow Black oil correlation

Optimization based on: Theoretical results Two-Pen chart Liquid fall back Slug rate/velocity Cycle length and frequency Injection gas requirement

Program Objective

Program Description

• The program establishes valid PVT relations using a suite of black-oil empirical correlations.
• Fluid inflow performance can be determined using one of the following eight methods: Single phase flow (Constant PI, and Darcy); Transient IPR Curve; and Two-phase flow (Vogel, Standing, Coute, Fetkovich, Jones-Blount-Glaze).
• Intermittent lift design can be developed using one of the following four options:
• Spacing factor method
• Decreasing Injection Pressure or
• Constant Injection Pressure
• Tubing/injection pressure based design
• Percent Load or
• Opti-Flow
• System optimization feature permits the user to analyze one of the following: Required number of cycles; cycle length; liquid slug velocity; liquid rate; injection gas volume; and liquid fall back.

Optimization can be performed using either a theoretical approach, based on calculated parameters; or a "field" approach based on measured bottom hole pressure and temperature values.
 
• Quick and efficient way for using gaslift DATA BASE. The data base includes the gaslift valves that are commonly used in intermittent gaslift. Alternatively  valve characteristics can be entered by the user.

Recent additions include English system of units in addition to the Metric system already available previously. Future enhancements will include plunger and chamber lift design, and troubleshooting diagnosis using two-pen chart data.

GLIP is easy to use and provides a menu system. Online help is also available. The output can be graphical on a wide variety of devices. Reports are also generated.

The program entries are for a single-well model. The data related to a well can be used to modify for additional cases.

Hardware Requirements

This MS-DOS based program is a single user application on a PC-compatible equipped with a math co-processor. Hard disk requirement is 10MB. A monochrome or color monitor equipped with EGA or VGA graphic adapter is required for display of graphics.