Private Forums
Hydraulic program models
18 October 2011
Ladies and Gentlemen,
I see hydraulic calculations submitted by Directional Drillers on the "Reed Hydraulics" software.
However, I see differences to my own personal program (which I have set to Power Law model).
Can anyone please be kind enough as to let me know the model the Reed program uses.?
I am hoping this will explain the differences.

Best regards, and apologies to Dave for mentioning a Brand Name in the post.....Hendo
4 answer(s)
Mentor to the youth of our industry
Total Posts: 131
Join Date: 27/02/08
I too have a program that will additionally calculate tool joint losses.
But no - there is still a difference in pressure drop through pipes.
I feel the model used is where the confusion is setting in.
But - I wonder how to tell which model the Reed program is using from looking at the print out (other than simulate with different models and check for similarity).
Mentor to the youth of our industry
Total Posts: 131
Join Date: 27/02/08
Many thanks for your quick and really interesting reply.
You say the Reed software can use both Bingham and Power Law - but how can the user select this.?
Also is there any way of looking at the print out and knowing which model has been used.??

Thanks again............Hendo
Well Engineer
Total Posts: 4
Join Date: 22/12/08
Have you checked if your personal program calculates tool joint pressure losses? Defaults of several programs don't take TJ pressure losses into account. I need to select it from check box in program I currently use.

As far as I know, Reed program does consider TJ press loss in the calculation.

Rgds, mike
Fluids Specialist OMV Petrom S.A.
Total Posts: 19
Join Date: 11/12/09

Reed software can use both methods (Bingham ot Power Law) depending on user preferences/requirements and whether laminar or turbulent flow is required into annulus.
By default, software is set to laminar flow into annulus.
However, it is considered acceptable if calculations are in less than 5% difference that directional co calculations as this may come from tubular sizes averaging. If differences are bigger, then may be the case a different hydraulic model is used or there is an input error.
Please feel free to contact me any time if you need more details or you have any questions related to this topic.
Best regards,
Teodor Babut
NOV Downhole
District Manager SE Europe
Jump to top of the page