Procedure and Calculation example for Change in Circulating Rate

Procedure and Calculation example for Change in Circulating Rate

Procedure and calculation example for Change in Circulating Rate while circulating an influx during a well control incident.

1. Calculate the average mud weight (Wav) in the string at the time pumping is stopped or changed.

2. Calculate shut in drillpipe pressure (PDP) at the time pumping is stopped/changed.

3. Maintain Pchoke constant for the short period it takes to change the circulating rate to the selected pumping speed.

4. Read PST at the new pump rate and PLOT this pressure . . .