An inexpensive computer program, utilizing the graphical capability of the IBM-PC, has been developed that demonstrates and teaches the control procedures to be used as the result of a gas kick taken during drilling. In order to properly diagnose and control a kick, one must have a complete understanding of what is happening downhole and why. The color simulation that is presented in this paper – which can be run in real-time or accelerated time – aids in this understanding process. The status of the drilling process, as well as the critical surface measurements available, are displayed graphically on the screen before, after, and during the control of the kick. The display shows the gas bubble, its growth as it is circulated out of the hole, locations of all of the different fluids that are involved in the system (drilling mud, kill mud, and gas bubble), and the surface effects that occur during the control procedure.

The program can be run in either a demonstration mode or a control mode. In the demonstration mode, a kick is circulated out by the computer by both the driller's and the wait and weight methods, using the ideal control procedure. An instructor can utilize the demonstration to point out particular points of interest during the process. In the control mode, the operator of the program uses the keyboard to control the process. That is, he or she has direct control of the mud weight to be pumped, choke opening, and pump speed. At the conclusion of a run in either mode, graphs are produced of various pressures as functions of the number of strokes pumped.

In the control mode, the program monitors the correctness of the control scheme and highlights incorrect procedures that would result in either a low bottom hole pressure, causing a secondary kick, or a high pressure at the bottom of the casing, causing a loss of circulation.

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