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Line Preventor
Shut in Procedures For Well Control Operation
Shut in procedures are specific procedures for closing a well in case of well control situation and personnel on the rig should get proper training and be familiar with these procedures.
In addition, the shut in procedures must be developed and practiced for every rig activity such as, drilling, tripping, logging, running tubular, performing a drill stem test, etc.
What is the reason why we need to have the shut in procedure and frequently practice it?
The main reason to have the specific shut in procedure is to minimize kick volume entering into a wellbore when well control situation occurs. Basically, the faster to recognize kick and shut in a well, it is the better to manage a well control situation. The amount of wellbore influx that enters the wellbore are minimized when personnel respond quickly to shut the well in. It is the fact that a small amount of kick entering into the wellbore will result in lower initial shut-in casing pressure and lower casing pressure while circulating. What's more, the lower pressure at surface will reduce the chance of breaking down hole formation, generally called underground blowout.
Who is responsible for shutting the well in?
Drillers are responsible for shut in the well. If any positive kick indications are observed, they must shut in the well first and confirm whether the well is properly shut in or not. After that, they must inform drilling supervisors on the rig.
2 types of Shut-In (Hard Shut In and Soft Shut In)
In the drilling industry, there are 2 types of shut in which are Hard Shut-in and Soft Shut-in.
- Hard shut in: It means that while drilling, choke line valves are in a closed position. When you have the well control, you just shut in a blow out preventor. The choke valves will be opened when we kill the well. The hard shut-in is the fastest method to shut in the well; therefore, it will minimize volume of kick allowed into the wellbore.
- Soft Shut In: It means that while drilling, the choke line valves are in an opened position. When the well control situation is occurred, you shut in the blow out preventor and then close choke valves to shut in the well. The soft shut in procedure allows fluid to flow through the surface choke line before the well will be completely shut in. This is the bad part of the soft shut in procedure because it doesn't minimize size of the wellbore influx.
The shut in procedure is the company specific procedure. You need to follow your company policy to shut in the well. I personally recommend "HARD SHUT IN PROCEDURE" because it allows me to shut the well in as quickly as possible and the kick volume entering into the well bore will be minimized. Please also remember that less volume of kick you have in the well bore, the less problem you will see when you attempt to kill the well.
About the Author
If you are interested in well control knowledge, please see from this Well Control blog.
Rachain J. is working in drilling operations and he would like to share basic knowledge about drilling formulas and drilling operations. For more information about drilling formulas, please read on his blog Drilling Formulas and Calculations
Running Sprinkler lines???
I am installing a sprinkler sys. with my nieghbor and i have a few questions
1) do i need to install a back flow preventor when hooking up directly to an out door weel pump?
1a) how can i measure gallons pr minute from the well?
2) what size poly pipe/ pvc do i need to run to the regulators(80ft from pump)
3) when running my lines out to the heads(from the regulators) do i run 1" then reduce to 3/4"
4) Do I run one MAIN line out of the regulators then reduce or run 3/4" and split them at the regulators?
5) how do i know i will have enough pressure to make it to the street which is about 400 ft from the well pump and 3280 ft from the regulators.
Thank you in advance for all answers
im not sure if youre backflow would be neccesary. i would say not. we dont install them on pumps from lakes.
they make a guage you should be able to buy and check it with that. or you could do it an oldfashioned way.
if you can find a water faucet outdoors that is not after a PRV valve if you have one.
take a five gallon bucket and time how long it takes to fill up.
20 seconds=15gpm
by regulators i am assuming you are talking about the valves
i would run a 1inch mainline PVC to the valves.
and run one inch lateral lines, but bushing off to 1/2 in poly pipe for the heads. no more than 2 heads per poly line.
test your GPM and PSI
you should be able to buy a guage to test it.
good luck.
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