Governing Equations for Nitrogen friction pressure

[gradys]

I'm trying to determine pipe friction pressure resulting from pumping N2 at 100 Mscfm through 4.5"(OD)/4.0" (ID), 11.6lb casing. Does anyone happen to know the governing equations?

 

[dcasto]

Bernoulli's principle is a good place to start.

 

[gradys]

Thanks for replying dcasto. In this situation pressure and volume will be fluctuating, so I don't believe Bernoulli's applies. I should have mentioned in my original post that this is for the purpose of rock formation fracturing, so not a simple case of just a gas flowing through a tube.

 

[katmar]

Depending on the pressures involved you may get away with using short-cut methods. If you describe your problem with a bit of detail you may find people who can help.

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com

 

[dcasto]

I believe I'll sit this one out, here is why. You will need Darcy's laws and I'm not an expert. But from my limited experience, the contarctors that run such frac jobs have huge databases that use the basic Darcy and then modify empherically what will really happen. this dat is what they earn their keep on.

PLUS, with a single post and getting near the end of a school year....?

 

[MortenA]

Gradys are you talking about a transient flow? Is that the partthat interests you or is it flow in the rock?

Best regards

Morten

 

[BigInch]

You only mention pipe flow specifically. If you just need the pipe flow part, Colebrook or Churchill equations work as long as the pressure drop is kept to less than 10% of the inlet pressure in any given segment.

If you're talking about flow into the reservoir, yes, that's another scope entirely.

Which one is it, or is it both?



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