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Determing Shale Shaker Screen Sizes
Contractors (and operators) look at SCE as a line item and there is a total disconnect between good SCE and dilution etc. This is what happens when lawyers and accountants run the world. Jay, good common sense observation.
I would be very surprised if anything exists. I agree with you - all the usual suspect variables - formation type, mud type, additives concentration, flowrate, cuttings loads, shaker efficienecy - I'm sure the guys could expand on this list. More of an emphasis on saving money than running a disiplined solids control regime that will save them money and even wells, but most clients in Kaz (and elsewhere) can't seem to get their heads around this. The state of repair of their equipment usually reflects this attitude. Clients like this are difficult at the best of times. I sometimes tell this type of client that I forgot to pack my magic stick but will remember it on the next visit. Good luck with this one mate.
Shaker Screens can be sized properly if a defined flow is given.The new sizing system for the various API numbers deal with this. Things like formation types and the differences in cuttings will determine the actual screen. Generally from the field you want to keep you shaker with the flow not going past 3/4 of the lenght of the shaker rail.
Some customers will ask a lot of these types of questions and they are hard to answer
There is no definitive chart or procedure, however one of the best ways to get the maximum Economic performance out of any screening device on the rig these days is if the SCE is rented as is usual these days with the exception of the primary shakers, always try if possible to influence the operator to use a SCE company that is in no way affilliated to the DFC. If this is done the solids control hand and the mud engineer police each other the result being improved solids control and less losses on surface equipment. Unfortunately however the decision to give out the initial contract is quite often made by a commercial person who is only looking to reduce his/her workload and bases their decision on just having to handle one invoice covering MUD per month
As usual good comments and excellent observations. Dave & Nick, you are correct about the commercial aspects. Contractors (and operators) look at SCE as a line item and there is a total disconnect between good SCE and dilution etc. This is what happens when lawyers and accountants run the world. Jay, good common sense observation.
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