I wonder if someone well versed on Sonris can comment on how to interpret the choke numbers on the new Sonris system. I notice that they are expressed as a whole number. It mght say 12 or 15 or 78 for that matter. Is there a guide for what that translates into as a fractional number like 12/64, 15/64, 23/64, etc?

 

Thanks

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Yes,  the orifice is measured in sixty fourths of an inch.    16/64 = one quarter inch.   32/64 = one half inch.

So Skip, on this well where it uses the number 78 in the choke column, are they saying they're running that at 78/64 = 1 and 14/64 inches? Wouldn't that be a gaping choke compared to what we're seeing in the way of these other wells?

WELL TESTS

RPT TYP TEST DATE RPT DATE OIL POT COND GAS DEL WATER BSW% FLOW PRES SHUTIN PRES CHOKE UPPER PERF LOWER PERF BOT HOLE PRES
DT-1 09/19/2010 11/01/2010     4107 90   2902 304 78 10858 14696  
DT-1 04/06/2010 05/01/2010             157 15 10858 14693  
SDM2G 01/15/2010 01/15/2010     6502 12       12 10858 14977

I don't know how you define gaping, HMI, but you can look at the Flowing Pressure and Shutin Pressure and see the reason for the open choke setting.  I suggest that you compare those pressure readings with those of wells that are on choke settings a fraction of an inch.

Here is a link to a previous discussion of a choke greater than 64 that may help answer some questions.

 

http://www.gohaynesvilleshale.com/forum/topics/80-choke

The replies in this discussion contradicted each other.  The general feeling seems to be it is just a 64ths inch reading, and going above 64 implies a pipe over 1 inch in diameter, but Brad, a well-tester said:

"Some of the auto chokes the producers are using show percentages when first installed until they have updated the software to show 64ths. There is no such thing as an 80/64 choke. I know this because I deal with these wells on a daily basis. Well tester here!".

 

Of course, I don't know if that implies that the chokes for the wells shown that went to 80 were  always calibrated in %, or what...

 

So I used to think that everything was in 64ths myself, but am now confused...

Yes, you can pick and choose who to believe or just believe the choke numbers over 64 are a typo.  I see a lot of old wells with very low pressures that are reported as producing on an "open choke".  I guess we could then go into coiled tubing diameters.

Gaping may be a strong adjective. Relatively speaking ... 78/64 would be a far cry larger opening than the 10/64th the well meter technician told me it was at when we talked on the site of this well. On those numbers above, it looks to me like the shut in pressure increased when the choke number increased - which strikes me as being opposite of what it should be. Am I missing something Skip? Talk to me about the Flow pressure and Shut in pressure and what you see there. Translate please. Are you basically saying that they needed to open it up because if they hadn't the production would be nill?

 

I did read the other thread and LesB's comment about the "Choke body" possibly being an answer to the question.

 

In the meantime I'll go compare some numbers on other wells.   

  I think a tighter choke should equate to an increase in flowing pressure.  And I think that shut in pressure should not be affected by choke settings.  But there are better members to ask.  LOL!  I suggest Les B.

Your statement is correct Skip Peel.

HMI, the shut-in pressures shown above look to be questionable.  What is the well serial number?

HMI, as someone mentioned I believe a reading greater than 64 like 78 would be a reference to a percentage opening (ie 78%) rather than to a fraction.

Jack Blake don't know much, but he knows all types of chokes inside, outside and upside down............

They are measured in 64ths of an inch.

a 78 is 78/64"- yes- it is over an inch.

If they put "open choke" it means the choke is fully opened. They would put "open choke" if the well has an adjustable choke and it is fully opened. I have worked with adjustable chokes in the past that full open is 128/64". That is a 2" opening. I have also worked with adjustable chokes where full open is 64/64, 72/64", 128/64" and 196/64".  It just depends on the application and the manufacturer. 

If it is a "positive" or "bean type" choke you have to install the choke in the "choke box" which is on the wellhead. If you get to where you need a full open choke on these type chokes you install a "72/64" or a "thread protector" which is a 96/64".

Sometimes if the well flows cool and is under high pressure you will have a choke on the well head and another choke downstream in the flowline about 10' from the first one.  In this way you take two pressure drops to eliminate freezing.

Sometimes you install a "downhole choke" in the tubing so you take your first pressure drop downhole and your second pressure drop at the surface.

I have seen and operated positive chokes that were 4" choke boxes and you could go up to 196/64" choke beans.

I went to look at the well in my section (It is a SWEPI well so I think this is probably a standerd SWEPI configuration for HS wells) and it has a " 2" ABB Vetco Gray Type 80" positive choke box on the well. You can put from a 6/64" choke bean up to a 72" choke bean in the well normally.  ABB Vetco does not manufacture them, but you can have a machine shop make a 96/64" thread protector to go in this choke box.

 

Some of my statements may contradict each other, but there are misc. nuances and this is how it is.

Jack Blake

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