Gas Migration | IWCF | Well Control | Drilling | Shut in Pr | SIDP | SICP | Driller Method | BHP

How to control gas migration, After closing in the well and lining the annulus up to the choke manifold, the pressure should be monitored on both the annulus and DP gauges until it stabilizes (first build-up). The time required for the pressures to stabilize will depend on the permeability of the producing formation. The stabilized pressures are required for subsequent calculations prior to killing the well. If the influx is gas or contains gas, this gas will migrate up the well. With the well closed in the gas cannot expand and will retain approximately its original pressure.
The column of fluid above the gas will become smaller as the gas rises and
therefore the hydrostatic pressure due to this fluid column will reduce. This will result in an increase in surface pressure on the annulus.
Since the migrating gas bubble retains its original pressure, the bottom hole
pressure will rise. This will also cause the drill pipe pressure (PDP) to rise by roughly the same amount. A crew member must continue to observe the gauges and record the values of Pann, and PDP, against time to check for such pressure increases. These increases as a result of the influx migrating up the annulus are called secondary build ap. Secondary build-up can often be distinguished from the stabilized shut-in pressures on the graph by plotting back along with the buildup.
The aim throughout secondary well control operations is to keep the bottom hole pressure equal to PO. Thus, if the pressure rise due to a secondary build-up becomes significant, the fluid must be bled off from the annulus to allow the gas to expand as it migrates and thus keeps the bottom hole pressure constant. Assuming that the drill pipe contains the original drilling fluid, fluid can be bled off from the annulus until the drill pipe pressure returns to its original value. Accurate measurement of the volume gained in the tank(s) must also be made at this point as this gives the volume of the influx in the well. This value is also necessary for subsequent calculations.
RigWorld Well-control Training Manual

[@FA-uf7vr]

Very well explained and easy to understand. I have been to two well controll classes and I found it this is much clearer.

[@AjayVermaErigworld]

Thanks for appreciating my work

[@hafidcherif7086]

This is a nice academic course. Thank you too much for your big effort Mr. Ajay

[@RanjeetSingh-ri2si]

We need more such videos. Such a nice explanation.

[@mejarsinghmaan1697]

Very good explanation

[@AjayVermaErigworld]

Thanks for liking

[@falahalhajri5067]

Nice video
But one thing I do not get in .. if you have to wait for pressure to stabilize and gas is always intend to go up ( meaning pressure won’t be stable) in this case pressure in the well won’t be stabilized at all

[@trendingtiktoks]

Thanks Ajay, I actually took a paid course and still they didn't even comes close to explaining it like you did.

[@mithifun5361]

Good teacher

[@ravinderchandel7957]

Excellent explanation Sirji

[@AjayVermaErigworld]

Thanks 😊

[@saadshabana]

Excellent, thanks for amazing explanation.

[@saadshabana]

The question is (is this high BHP is enough to break down the formation or at least make some losses inside the formations?)

[@kouachkhiafateh5136]

Good explanation thank u

[@delonthompson9631]

You are very good

[@qussaihantoush3955]

Thank you

[@dogloversparadise2636]

Superb.... understood in one time.... thankyou sir.

[@AjayVermaErigworld]

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[@hayderataby2229]

Thank you ..its so useful and interesting.

[@AjayVermaErigworld]

I invite you to join my new course for free. Click on the below link to join.
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[@MalikAli36150]

very nice lesson Sir

[@avinashnegi4u]

Thanks

[@ahmedabuyousef3673]

thanks

[@adilm7295]

Can you please help me to understand how the gas will behave, when it sits right below the packer and if I've also 500 meters of 5-7/8" DP tail below packer.
Will i see pressure on the dp side?

[@senobudigiyatno7263]

I have calculated all your formula, why pressure above bubble before migration 5931 PSIA that pressure move above 4000ft below casing, that pressure from 8430 ftx0.052x8430+671psia as matematic ok, mean of gas moving above to 4000 psi ?

[@ridhadjegta7303]

Thnx for this intresting lesson, i have a question, does the gas influx keep Always the same height while migration ?

[@AjayVermaErigworld]

This example is for understanding on assumption that we have uniform OD string. Other wise yes bubble hight will change according to annulus capacity. Thanks

[@senobudigiyatno7263]

Why calculated BHP you back 570ft X 0.12 PSIA/ft = 68,4 psi ?
Not use 5931 psi
BHP = 5931 psi + 5260 psi + 3435 psi ?
Is consistent

[@MalikAli36150]

Hi Sir do you have Guage problems clip. Your clips are very good

[@AjayVermaErigworld]

Thanks for the comment. Yes we have complete Gauge proble software. But you have to purchase it. Let me know if ur intrusted. my mail id: [e-mail]

[@mohittagotra205]

If float valve is installed in drill string then what is the sidpp? To calculate sidpp we need to circulate slowly till there is increase in sicp. At this point we get the sidpp. Is this right?

[@AjayVermaErigworld]

Hi Mohit please checkout this link. th-cam.com/video/U2r-Gq7gAro/w-d-xo.html

[@omar.alkhamry]

Doesn't the height of the bubble decrease while migrating from narrow annulus around bha to wider annulus around drill pipe so hydrostatic of influx changes even if minimally?

[@AjayVermaErigworld]

Thanks Omar for the comment. The condition is not always drill string with BHA. The change is very minimal at bottom and then after that hight remains the same though it might slight decrease when it enters in the casing. As per academic and all the well control manual the sight changes are ignored. Also as per IWCF AND IADC the bubble hight remains same thus internal pr remains constant. Rest all the well bore pressure increase equally.
Hope this might solved ur query. Thanks

[@omar.alkhamry]

Thank you very much for your time & kind reply

[@srikrishanaghosh1016]

Can I contact you..I need to teach about this...

[@AjayKumar-yh8nd]

Pls boss I need to know about assistance driller all things that as is common pls

[@AjayVermaErigworld]

I invite you to join my new course for free. Click on the below link to join.
www.erigworld.com/s/store/courses/description/FREE-COURSE

[@user-yb1bt2zm3h]

if bubble is not allowed to expend so the bubble don't migrate. Can't migrate without expension!!??

[@AjayVermaErigworld]

Lighter fluid always rise on the top.

[@user-yb1bt2zm3h]

@@AjayVermaErigworld yes but the bubble is on pressure. There is a differential pressure.

[@renerusso3332]

*How do you know that the actually formation pressure is 6000 psi- You do not. What was you shoe tested to and what was the depth of the shoe? DUH

[@AjayVermaErigworld]

This is not real well example or data. I am explaining gas migration and all the data is based on assumption. My main objective to make topic easy to understand without complicating by giving more data. We can discuss on any real well data if u have. Thanks

[@carlosdiaz2577]

the pressure of the bubble would be the pressure of formation minus the hydrostatic pressure of the height of the bubble

[@AjayVermaErigworld]

Hi Carlos thanks for appreciating my work. You can calculate bubble pressure in 2 different ways. 1. Bubble Pressure = Formation pressure - hydrostatic pressure of influx.
2. Bubble pressure = Hydrostatic pressure of mud column above bubble + SICP.

[@yazidboulakhras8024]

Thanks

[@AjayVermaErigworld]

I invite you to join my new course for free. Click on the below link to join.
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