# Establish Circulation in Driller’s Method Step – 1

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

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.

Let’s me explain more by showing you some equations.

Note: Acronyms are listed below;

BHP = Bottom Hole Pressure
HP = Hydrostatic Pressure
CP = Casing Pressure
FrP = Frictional Pressure

At static condition: BHP = HP in the annulus + CP

At dynamic condition: BHP = HP in annulus + CP + FrP

In the dynamic environment, if we pump as slowly as possible, FrP can be ignored. The equation above tells us that when you hold CP constant, the BHP will be maintained the same.

After you bring pump to kill rate, you will get circulating pressure called Initial Circulating Pressure (ICP). ICP is summation of shut in drill pipe pressure (SIDPP) and pressure to overcome friction called Slow Circulating Rate Pressure (SCR pressure). Hence, we can write the relationship in term of equation below.

ICP = SIDPP + SCR pressure

SCR pressure = ICP – SIDPP

Note: Kill rate is normally about 2-5 BPM.

Before performing this operation, you must ensure these following items;

1. Ensure that team members know their role and responsibility. You should have a pre job safety meeting before killing operation.

2. Eliminate all ignition sources that are close to the rig and vent lines of mud-gas separator.

3. Ensure that a circulating system is lined up properly.

4. Zero strokes counter and record time every activity.

### Related Post

Factors Affecting Kick Tolerance As you know, Kick Tolerance is the maximum gas kick volume for required Kick Intensity at a certain depth that you are able to successfully shut-in an...
Stripping Procedure with Volumetric Control For Mi... With gas kick in the well, the conventional stripping method is not application because it won’t account for the gas migration and expansion; therefor...
Kick Penetration For Stripping Operation Kick penetration is one of the most critical concerns for stripping operation because a kick height will change due to change of hole geometry. In thi...
Hole Monitoring Procedures While Running Casing or... This is the example of hole monitoring procedure while running casing and this will give you some ideas only. You need to adjust it to suit with your ...
Share the joy
•
•
•
•
•
•
•
•
•