Sand production and line velocity check 1

[Radionise2]

Hello everyone,

In the Salama method calculation for excessive erosion, he assumed a typical acceptable sand concentration as 5 ppm, but it had not been quoted in the OTC paper if this is on a mass or volume basis, can anyone shed a light on this? I presume a mass basis would be more reasonable.

Also, how do you quantitatively describe a 'sand free' production? Anything that is described as free is bound to the detection limit of the measuring instrument. Now from what I know, what is normally done to evaluate sand production is to route the production fluid to the test separator, and start to lower down the wellhead or choke pressure until sand is detected. But what's the typical detectable limit of this instrument?

Cheers all!

 

[MortenA]

Why dont you have a look at the DNV methode for erosion (DNV-RP-O501).

I use "sand free" as 1 lb/1000 bbl. This is about 5 PPM (slightly less)

Best regards

Morten

 

[ProdEngxxl]

Do not know if you want to quantify the amount of sand through your system? if its the case, one method is to divert the well through the Test Sep and manage to get the amount of sand. Another method is to simply install a sampling point downstream of the tree or the well flowline.
Then you can manually sample/filter/wash the outlet fluid and get the Sand. No matter how much sand is collected, you can estimate the volume as 1lb/1000 bbls and extent to total fluid produced per day.
At this point you can push the calculation to estimate the velocity taking into account the pipe dimention and total flowrate.
These are general steps for a manual sand volume estimates.
Hope this will help.
cheers
KK