×
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

Overpressure protection strategy for wellpads in a highly sensitive environmental location

Overpressure protection strategy for wellpads in a highly sensitive environmental location

Overpressure protection strategy for wellpads in a highly sensitive environmental location

(OP)
Dear All.
A client's current preferred OPP strategy for wellpads (to flowline) is to use an instrumented PSHH based first protective layer and PSV that releases to emergency drilling pits as second layer. Because of the environmental sensitivity of the location, use of HIPPS would have been better however the client argues that the reaction response may not be sufficient enough hence the discounting for the HIPPS. My view is bladder accumulators could be used to dampen the pressure increase which would give enough time to the HIPPS to react and hence reduce on the need (if any) of the PSV.


Full rating is discounted due to high number of wellpads thus it would be costly achieving a #1500 through out the whole system!

What strategy would you propose. Do you think it is wise to go PSV for fast transient handling. Wat is your experience with use of emergency drilling pits? Any benefits or challenges faced using such pits?

(A multiphase fluid is handled O, W,G)

RE: Overpressure protection strategy for wellpads in a highly sensitive environmental location

Dynamic simulations are required to establish set point for a HIPPS - this is exactly due to a different nature of any system out there (different volumes, different flows, different phase fractions etc.). So, you don't want a bladder accumulator, you need a well designed HIPPS. Secondly, a bladder accumulator would significantly reduce integrity level of the HIPPS.

There is no such thing as "common sense" - Apollo RCA

RE: Overpressure protection strategy for wellpads in a highly sensitive environmental location

I'm guessing that this HIPPS probably needs a time-delay to avoid unnecessary trips. I don't see any problem with using a 1500# bladder accumulator, but how bib would it need to be, after accounting for the HIPPS time-delay? That may render it impractical, as a stand-alone alternative to the PSV.

RE: Overpressure protection strategy for wellpads in a highly sensitive environmental location

(OP)
Thank you all for the responses

The decision not to use HIPPS is because its reaction time will be too slow to fast transients such as blocked outlet scenarios.


So the idea is since a bladder accumulator can dampen the pressure increase, it would give enough time for the HIPPS to react appropriately in time!



My query though is what is your view in PSV relieving into emergency drilling pits. Any experience on this routine

RE: Overpressure protection strategy for wellpads in a highly sensitive environmental location

its just so more complicated and possibly costly going dowwn the instrumented route (testing and sourcing of instruments valves etc) that you should try to convince your client to use fully rated piping (if its #1500) to the separator...

Best regards, Morten

RE: Overpressure protection strategy for wellpads in a highly sensitive environmental location

(OP)
MortenA,
Thank you for the response. Yes indeed going full rated would be a sound option however the economics may not support it (roughly over 50 well-pads). The HIPPS option may also suffer from poor reliability since the complexity of managing a high number of such systems creates an obstacle.

Cheers,
Sesq.

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