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!
  • Students Click Here

*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


Signs of downhole hydrate vs liquid loading

Signs of downhole hydrate vs liquid loading

Signs of downhole hydrate vs liquid loading

Hi All!

I'm hoping someone can give me a bit of advice on an issue I've been working on while starting up a gas well that has been shut in for around 6 months. I'm a process engineer on a company graduate scheme, at the moment I'm working in operations and was asked an opinion at the weekend on a failed well startup.

The well being restarted is a wet gas well. The operators had been injecting methanol downhole (from a wellhead injection point) and when the choke was opened the well began flowing initially at 20 mmscfd, however the flow began tailing off and eventually stopped. Tophole pressure dropped as expected until it settled at the topside operating pressure. The bottomhole pressure fell as well, however it then plateaud and began slowly rising, this happened after the flow had tailed off. Once the choke was shut both the THP and BHP began rising before settling out. On two further restart attempts both pressure gauges showed the pressure initially drop, but again the gas flow was not sustainable.

My initial thoughts were that we had a liquid loading problem as opposed to a hydrate blockage, due to the movement in both BHP and THP during subsequent start up attempts. The SSSV was open prio to startup and I can't think where a hydrate would form. In addition the flow never stopped suddenly but began tailing off even while the BHP was still dropping. This is however the first time I've dealt with a problem like this and there is a suggestion that it is actually a hydrate blockage as opposed to liquid loading - which makes me think I've made a bit of an embarrassing mistake!

If anyone has any advice on what I should be looking for to prove/disporve liquid loading and/or a hydrate, or can share any similar experience I would appreciate it! I'm keen to learn from this.


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!


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