Tag Archives: Well Control

Circulate Kill Mud – 2nd Circulation of Driller’s Method

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Once you finish weighing up your mud system to required kill mud weight, you need to do the 2 nd circulation of driller’s method. This post will describe how to do the 2nd circulation of driller’s method.

The second circulation of the driller’s method will be started after drilling fluid is weighted-up to required kill weight.

First, when you establish the desired pump rate you must hold casing pressure constant while bringing the pump up to speed, killing rate +/- 2-5 bpm. Please always hold this pump rate constant throughout the killing process.

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Shut Down Pumps and Weight Up Mud in Driller’s Method

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After kick has been circulated out of the well, the mud pumps can be shut down and the well must be secured. While shutting down the pumps, it is a good practice to gradually close the choke instead of suddenly shut in.

You must keep in mind that while shutting down pumps, you must keep casing pressure constant achieved by manipulating the choke. This procedure is to ensure that constant bottom hole pressure is maintained during the shutdown.

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Circulate Out The Influx Holding Drill Pipe Pressure Constant

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After the pumps are brought up to desired kill rate and drill pipe pressure stabilize, personnel must observe and record the drillpipe pressure. For the first circulation, you must hold drill pipe pressure constant in order to maintain constant bottom hole pressure. To achieve maintain drill pipe pressure constant, personnel must manipulate the choke while circulating.


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Establish Circulation in Driller’s Method Step – 1

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I completed about well control formulas from previous blog post and then I would like to continue about driller’s method in details.

You can read previous about driller’s method here!!!

Today, I post about 1st step of establishing circulation in driller’s method, bring the pumps up by holding casing pressure constant.

The idea of holding casing pressure constant while bring up pumps is to maintain constant bottom hole pressure.

Bring pump up to circulating rate, typically about 2-5 BPM, by holding constant casing pressure. The reason why we need to hold constant casing pressure is to maintain constant bottom hole pressure.

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Well Control Formulas Part 1

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I would like to share with you about well control formulas that might be advantageous for you in the future. I seperate into several parts for you to easy to follow.

Before going into all calculations, I would like to emphasize about rounding rules that we will use for well control calculation.

1. Kill Mud Density: We must round up to one decimal place from a calculated kill mud density. For example, if we have the calculated kill mud density of 13.32 ppg, we will round it up to 13.4 ppg.

2. Leak Off Test (LOT): We must round down to one decimal place from a calculated Leak Off Test value. For example if we have the theoretical LOT of 15.57 ppg, we will round down to 15.5 ppg.

When any of the above values have been calculated, the rounded numbers must be used in subsequent calculations.

Well Control Course Equations Part 1

Pressure (P) – psi

Pressure (psi) = Force (lb) / Area in Square Inch (in 2)

Pressure Gradient (G) – psi/ft

Mud Gradient ( Psi/ft ) = Mud weight ( PPG) x 0.052

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