Static reservoir presuure

[bayan]

Dear all,
Can any Eng.Help me :as we know that if we wan to know static reservoir pressure we have to shut in the well......ect.
if we have field with all well running,I mean all well on production there is no well shut in,my Question is there any methode to calculate the static reservoir pressure as this situation.
YOUR Answering is high appreciated

[kochichiro]

Two-rate flow test, you'll be able to estimate static pressure from it. Test procedure as follows: your well is working with some flow rate, than you would change it to some lower rate and register pressure curve just as build-up. Interpretation procedure described in attached document.

[bayan]

Dear Kochicichiro,
Thank you so much for your quick reply and helping.did you have any spreadsheet about that.
again thank you.

[kochichiro]

Unfortunately, I am interpreting such tests in Kappa Saphir, so I don’t have spreadsheet.

[bayan]

Thank you so much for your cooperation.

[mansour1983]

Dear kochichiro,
thank you for sharing, but most of the time pwf measurement is not available , so what would you do in that case

[kochichiro]

Well, yeah, that is the problem. But why you can’t measure Pwf? You have ESP systems installed without PDG? You don’t have well test engineers on your field?

Well, there is still one method to resolve even this problem. You can measure well head pressures during two-rate flow test procedure with digital pressure recorder and convert them to bottom-hole pressures. Therefore, you can perform pressure transient analysis.

Nevertheless, there is still one problem, when you are calculating bottom-hole pressures from well head ones with VLP correlations. Lower rate would give you lower BHP and vice versa, what is not correct comparing with real pressures behavior. To resolve this problem you must calculate BHP’s on both flow rates with one averaged flow-rate and real pressure behavior would be preserved. After you acquire BHP’s you can perform normal analysis with two rates. This is kind of rough procedure, but I used it on one of my wells (we could not run bottom-hole pressure gauge there due to problems with subsurface equipment). Calculated pressures deviated from real ones measured previously only by 0.5-1 %. I think this is pretty good result.

[bayan]

Thank you so much for your time

[mohsen2396]

helllo guys and thanks for your helpful guides,
Is there any software which interprete Two rate test? I know working with pansys to some extent, Is this software has this ability?plz show me how I can work with this software or any other to interprete this test, I'm waiting for your answer, thank you veryyyyyyyyyyyyyyyyyy much.

[kochichiro]

I dont know about pansystem, but you can easily do it in Kappa Saphir. Here is my little manual about two-rate flow test interpretation.