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

Water Production Line Design

Water Production Line Design

(OP)
Hi all, Im wondering if it is possible for gas to go up the production tubing for a CBM well.

IMO, the maximum pressure of the piping needs to be that of the max deadhead pressure of the pump, but is it possible for the gas to go up the production casing and see bottomhole pressure in the case that too much water (or all) of the water is removed by the pump?

Cheers, Jesse

RE: Water Production Line Design

Look up "Turner Critical Rate". This is one of several theories that revolve around a drag model. I covered many of these concepts in my Oil & Gas Journal Article, but it doesn't cover the basics. Most of the wells in the central "fairway" of the San Juan Basin CBM field free flowed for the first 15 years of production. Most are on pumps now, but not nearly all. Also in the San Juan Basin we've put hundreds of wells on "tubing flow control" where there is a flow meter on the tubing, and when tubing flow is greater than critical flow a variable choke opens on the casing to make "extra" gas (some wells are making 2 to 3 times more gas up the annulas than the the tubing, with the tubing keeping water off the formation.

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.

RE: Water Production Line Design

(OP)
Thanks David....so my understanding of this is you use the smaller diameter tubing to increase the velocity and carry through the liquid? Losses in the tubing would make this a smaller value than through the casing, but its still possible.

RE: Water Production Line Design

The theory says that above a certain velocity, a gas stream can carry considerable liquid. In Turner's work he said that below 100 bbl/MMCF the liquid quantity was irrelevant. Coleman said that it was irrelevant below 220 bbl/MMCF. Both of these values are high enough to address a large majority of the gas wells. Higher velocities in the tubing do result in higher friction losses, but it is rare for this number to be larger than the hydrostatic backpressure caused by not removing the liquid.

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!


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