×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

nodal analysis of multi-layered commingled gas wells

nodal analysis of multi-layered commingled gas wells

nodal analysis of multi-layered commingled gas wells

(OP)
Hello all,
I am currently trying to put together a new workflow for nodal analysis using prosper for multilayer commingled gas wells.
The analysis will only include wells that I have mplt data for so basically i know how much production is coming from each layer.
Has any one have ideas on how I may produce a workflow to identify the skin factor for each individual formation that has been measured in the mplt?
any insight/direction would be greatly appreciated!!

RE: nodal analysis of multi-layered commingled gas wells

You really have three choices: (1) send a really skinny guy downhole to look; (2) make up some data; or (3) run a spinner survey. The first one is not well received by the skinny guys of the world (or by the Health and Safety guys). The third one is pretty expensive and the data is a very small step better than a guess. It generally comes down to guessing. There are a lot of high-sounding terms for it, but at the end of the day the best you are going to do is a WAG. When you figure in the "accuracy" of the multi-phase flow correlations that Prosper uses, this particular guess doesn't really hurt the outcome much.

I reviewed the capabilities of the first nodal analysis program (SNAP developed by Amoco in the mid 1980's) and it was more of a Monte Carlo simulation than a deterministic model. It often led to very good decisions. Since then the industry has tried to make nodal analysis mechanistic. The interfaces have gotten much prettier, and the weasel words get shoved into smaller and smaller print, but the decisions I see people trying to make with the new programs leave me shaking my head. The more complex the wellbore, the more it is needed and the less value it really adds.

I have to add a disclaimer. The last version of Prosper I ran myself was in 2003. Since I retired, I've seen output from several runs but I can't be certain if the nonsense was inherent in the program or if it came from the users being less than expert in its use. It might have gotten better, but the math it is trying to do is kind of tough.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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