I would like to share some well control acronyms so you will be more understanding about content in well control.
ACF = Annular Capacity Factor
BHP = Bottom Hole Pressure
BOPE = Blow Out Preventer Equipment
BPUTS = Bring Pumps Up To Speed
CLF = Choke Line Friction
CMW / OMW = Current Mud Weight / Original Mud Weight
CP = Casing Pressure
DPP = Drill Pipe Pressure
ECD = Equivilant Circulating Density
As per previous topic, driller’s method well control, it stated about overall of driller method and this post will show the detailed of driller’s method and describe in term of operation stand point as well. I separates all detailed-step of driller method into several blog post because I want to add a lot of details for each topic so you will clearly understand about driller method and you also can apply with your real life operation.
Today I will start with the first one is to shut in well and obtain pressure information
In order to get the correct value of drill pipe pressure, you need to have the correct floating bumping procedure. In this section, I will show you how to bump the float correctly.
These following procedures will demonstrate you how to bump the float correctly in order to get SDPP.
Drilling personnel need to fully understand about the lag time. Lag time is time delay from pressure adjustment made on a choke valve or a choke HCR to show up on the drill pipe pressure gauge.
Does it sound confuse? Let’s me explain more about it. When you adjust a choke position, you will not be able to see changes on the drill pipe gauge right away because drilling fluid is compressible so you need to be patient and wait a little bit until you see the changes on the drill pipe gauge.
Driller’s method is one of several methods to kill the well. The main idea of driller method is to kill the well with constant bottom hole pressure. The Driller’s Method of well control requires two complete and separate circulations of drilling fluid in the well.
The first circulation removes influx with original mud weight.
When starting to bring pumps up to speed, casing pressure must be held constant until kill rate is reached. Then drillpipe pressure is held constant to maintain constant bottomhole pressure which is normally equal to, or slightly greater than pore pressure. Drillpipe pressure will be held constant until influx is removed from annulus. If the wellbore influx is gas, it will expand when it comes close to surface therefore you will see an increase in pit volume and casing pressure. Continue reading
