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A choke is adjustable. It can be fully closed or any % between closed and 100% fully open.
adoubleuk
""If that's the case, you're hearing old news. First sight of the flare was last Friday night""
From the Second Well.
Wellwell is correct 25% open in my experience, but wtfdik?
yuyus,
" not at Production tubing but upstream side"
I absolutely must correct you here, but I know you'll forgive me for it. However it's a technical point about which a lot of people get it wrong.
(Dons mortar-board, picks up chalk, turns to blackboard, etc.).
Production tubing is UPSTREAM of the wellhead. Flowlines are UPSTREAM of the FPSO. The FPSO is UPSTREAM of the shuttle-tankers. The shuttle tankers are UPSTREAM of the refinery, and subsequent delivery of the oil to be delivered at petrol stations, turned into shopping-bags, beauty products, or whatever.
Just like a river, oil flows from its source, which is thousands of feet underground. But unlike a river, it defies gravity and flows uphill. This is why Drillers traditionally 'look down' on Production hands. Because everything beyond the wellhead (in terms of flow) is DOWNSTREAM.
(And who knows what hairy-chested beasts might have been p***ing in the headwaters!)
JayKay1,
Yup.
yuyus,
Yup.
Yes Aduk I’m used to 1/32 or just under 0.8mm . To get a % surely you need to Know maximum ID ( not at Production tubing but upstream side )
Wellwell,
Flowrate is not directly proportional to choke orifice size.
Define 'open', please.
which if so is important.
25% of open I'd say.
Well I feel better then AD! I pondered a few moments whether I should post that one!!
Won't take someone long I'm sure...
DrBruceBonus,
"Or put another way, is it flowing at 25% of full capacity or 75% of full capacity?"
I'm still logged-in, and seen your question.
Maybe those who have referred to 'percentage choke' could answer it for us, 'cos I'm as flummoxxed as you. I'm only used to seeing choke sizes referred to in thirty-seconds of an inch diameter...
In relation to 25% choke.... and don't forget there's no such thing as a stupid question......!
Does the 25% relate to the amount of reduction from unrestricted flow or to the total amount of flow relative to 100% being the unrestricted value?
Or put another way, is it flowing at 25% of full capacity or 75% of full capacity?
ChanFai,
"The other word in Aberdeen is flare sightings on Sunday."
If that's the case, you're hearing old news. First sight of the flare was last Friday night.
adoubleuk ... thanks for that.
The other word in Aberdeen is flare sightings on Sunday.
Oh, forgot to add...
I reckon we should get a flowrate figure when the FoiL RNS arrives: ie after 72 hours' stabilised flow from both wells, but AFTER this startup period. In two or three weeks' time.
But 'startup' instantaneous flowrates, maybe changing hour to hour would be meaningless, and for the company potentially misleading information to make public knowledge.
My own thoughts on this, referring to ChangFai's original question, which was:
"Flow Rates will be restricted to 9k bopd until September when it will rise to 13k bopd, then increasing to 17k bopd in November?"
Biffadog replied 'correct', and I think he's right in doing so.
HOWEVER, that flowrate applies to an average over the first couple of months of production, when 'downtime' (partly related to further data-gathering and other things) is likely to be higher than later on.
ChangFai again:
"So, when the first well was opened up on the 11th, what would the expected flow rate been ?"
My only answer to that is 'greater than 6000 bbl/day'.
Blade OIM:
"I don't know what was expected but... how would the SP react if the flow was around 15k bbls/day through a 25% choke ?"
Currently the installation is going through 'startup', one well at a time. And I very much doubt if actual detail figures of it will be revealed because it's not important, anyway. However I'd be HUGELY surprised if each well were kept on a constant rate during this period. My guess is that they'll be started on natural flow, then using one ESP after another to check they're both working (and the control systems for them from the FPSO as well), and so on.
Also, at the same time, this will be testing the FPSO's own production train under differing dynamic flowrate loads.
ChangFai:
"Word in Aberdeen is that it was more than that."
And I reckon word in Aberdeen is possibly right! The DST tests on the wells were 'constrained' by the surface equipment. The FPSO's 'constraints' are far broader. And I feel that without running either well 'flat-out', part of the data-gathering might include going to 20,000 bbl/day for a while, just to check consistency with 'modelling', and the equipment again, of course.
Btw. I have never heard of choking-down being referred to in percentage terms before. But I'm not a 'production hand'.
24%
35%?
Word in Aberdeen is that it was more than that.
I don't know what was expected but...
how would the SP react if the flow was around 15k bbls/day through a 25% choke ?
So, when the first well was opened up on the 11th, what would the expected flow rate been ?
Correct.
I can't find it now, but did I read ...
Flow Rates will be restricted to 9k bopd until September when it will rise to 13k bopd, then increasing to 17k bopd in November?