Choke size
Comstock just completed 4 cuL wells, and I have a small interest in the unit. Each well has around 6,000 # pressure, and a potential of around 24-25K. All sounds good. Each well has a 32/64th choke. My question, and I’m sure it isn’t simple to answer, but does that 32/64th choke have the effect of reducing production or increasing production. Seems to me that a lot of other wells have a 16 or 24/64 choke, and I don’t know how the different size choke affects production.
Considering the current price of NG, I’d just as soon they limit production until the price goes back up.
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Replies to This Discussion
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Permalink Reply by Skip Peel - Mineral Consultant on -
Steve, I think it is fairly common for many wells to start out on higher choke settings. I think this may be tied to longer laterals, more water and more proppant that must be recovered before a well reaches maximum flow. SONRIS only has choke reports every six months so it's hard to know for sure when wells are choked backed after clean up. The longer the lateral, the longer it takes for a well to "clean up". Yes, the Initial Production numbers are influenced by that more open choke. I suggest that you check the SONRIS well file for the first DT-1 report at six months post first production (Well Test section). Maybe Rock Man will weigh in but I think it increases flow and reduced flowing pressure.
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Permalink Reply by Skip Peel - Mineral Consultant on
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Here is a cut-and-paste Well Test section for a well drilled in Sept. 2020. I think this may represent a typical choke setting progression. It's difficult to find a well with an extensive well test history that is much more recent.
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 03/08/2023 05/01/2023 6872 40 40 12264 22041 DT-1 09/23/2022 11/01/2022 6211 14 1020 12264 22041 DT-1 03/20/2022 05/01/2022 8799 126 942 0 12264 22041 DT-1 09/14/2021 11/01/2021 0 15976 8 1613 40 12264 22041 DT-1 03/15/2021 05/01/2021 0 24514 314 4414 23 12264 22041 DT-1 10/26/2020 11/01/2020 0 30730 201 7342 17 12264 22041 SDM2G 09/27/2020 09/27/2020 43957 648 1 7414 36 12264 22041
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Permalink Reply by Rock Man on
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Correct - larger choke will result in increased rate but decrease in flowing pressures.
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Permalink Reply by Steve P on
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It seems to me that, with today's gas prices and the prospect that they will go up in the future, I'd want to limit production from my just completed well. The 4 wells I'm referring to (all good wells) have a 32/64ths choke. Does this mean that they are producing at a higher rate than would be possible with a smaller choke?
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Permalink Reply by Rock Man on
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Yes
With these large volume wells, one can damage a reservoir / well if you choke it back too far and try to restrict production. Letting the well flow at a certain rate is sometimes a necessity.
In ideal world, one would restrict production during low gas prices and open up more production during higher gas prices - but this would have a negative impact on the well in the long term.
I know a production engineer would be able to better explain this issue than I could as to specifics and technical details.
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Permalink Reply by M B Gilster on
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TY for that Rock Man, very helpful to a non-industry type like myself.
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Permalink Reply by Jed Clampett on
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It is my understanding that it is possible for operator's to test a HZ well's production. Sometimes the revenue from that production is 100% retained by the operator and not shared with the mineral owner. How many days is the test performed? My thought is a large choke size would allow a larger $$ to be retained by the operator.
Is what I am saying true or false? Can anyone elaborate?
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Permalink Reply by Skip Peel - Mineral Consultant on
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False. The well flow is metered. The measured volume is accurate regardless of the flow rate(s). All the flow tests required by the state are for a 24 hour period. We only see what the choke setting is on the day that the tests are run, approximately every six months. Chokes can be adjusted remotely so the twice a year tests don't tell us what the choke settings were each day of those six months.
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Permalink Reply by Jed Clampett on
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Skip, you are saying mineral owners get paid royalties in all well test production?
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Permalink Reply by Skip Peel - Mineral Consultant on
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No, I was not addressing that. I've never seen a well test first hand but suspect that the state installs their own meter for the flow test and the natural gas is still turned to sales. I could be wrong about a state meter but I've never felt any concern for the test as it has nothing to do with my client's royalties. Their gas is sold and they are paid over the test period. My comments are based on Louisiana regulations, not Texas.
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