INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

The relationship between pump rate, wellhead pressure, and bottom hole pressure. Well intervention.

The relationship between pump rate, wellhead pressure, and bottom hole pressure. Well intervention.

The relationship between pump rate, wellhead pressure, and bottom hole pressure. Well intervention.

(OP)
I just got a job with a coiled tubing company and I am reviewing some old data.

JOB: There was work on a 15000' gas well that had formation pressure of 9.3 ppg. SITP was 5000, and we displaced the well with 8.6 ppg FSW. After we displaced the fluid in the well, I saw that the WHP came down to 1000 psi. About 400 psi more than I expected. I also saw that WHP fluctuated between 2000-4000 psi through the job (keeping bbl in and bbl out - so claim the crew).

So my one of my two question is this. What would cause WHP to do this? My hypothesis is that the well was actually stronger than 9.3 ppg EMW and whenever we replaced the well with 8.6 ppg fluid and a WHP of 1000 psi we were actually still taking on gas. So it was as if throughout the job we were letting the well consistently unload our column of fluid as we tripped into and out of it.

Also, I saw the pump rate was all over the place. The pump operator wasn't maintaining the requested 1 BPM fluid rate (usually done when the choke operator manipulates his/her choke). Could this contribute to the WHP issue? Would not maintaining the 1 BPM significantly change the system outside of the annular velocities? I know if would change frictional pressure losses but is that loss covered by the 'gain/loss' in WHP?

Thanks in advance! I know it's lengthy. If you could also give your suggestion on any great well control literature that would be great.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close