PVT Analysis Discussion

[Bang Gaol]

Thanks olmos. Appreciate it.

[dev_r]

[link Point to another website Only the registered members can access]
It will take a bit of time, but this series of lectures on PVT will be well worth the time taken to listen to. Do It

Hello,

H mentions some course handouts and other supportive materials, is it possible to obtain them?

Thx.

Dev_r

[LOST]

there is a PVT analysis of an oil reservoir that i want to use for EOS regression.
when i split puls fraction into three seudo components the calculated saturation pressure
will be 1622 psi while the observed saturation pressure is 1618 psia.
there are some questions:
how could i know that this is a good splitting?
can i use phase diagram of new mixture(with 3 pseudoComponents) as a valid reference for regression?
or I should compare phase diagram of new mixture with phase diagram of mixture before splitting?

what is more acurate?
phase diagram of mixture before splitting with 1450 psi calculated saturation pressure OR
phase diagram of mixture after splitting with 1622 psi calculated saturation pressure?

thank you

[olmos]

When you are grouping some components, or in this case where you are splitting C7+, properties which will be calculated with your equaion of state have to change. There are some authors who have analyzed the best way to make this changes but finally they made different combinations and selected the one which reflects more accurate results with the laboratory data (not only pressure). Please analyze saturaton pressure, liquid density, GOR.

It is very important to tune your EOS with inforation from different test (CVD, CCE, Separatr, etc). You know, you can have the same saturation pressure but the shape of the envelope could be change because the quality lines.

In most cases with ag good control you can use this diagram as a valid references but as starting point, then you hae to elect some variables in the regression to adjust the bahivior of your EOS ith the laboratory data.

I always have control with the different envelopes during an EOS tuning to evaluate some inconsistences during the process specially if you are using BIC. The do not have to chanege so much.

Refering to your last question, heavy components properties are frequently unkown and for this reason you should use them during EOS tuning. You can have both cases, and both could be valids in terms of saturation pressure due to you can adjust during regression but as I told you before, it is necesary to evaluate other properties.

In a paper draw an envelope and then define your saturation pressure and then draw another envelope 2 times bigger than first one. you have to assure this one pass at the same saturation pressure. For this reason you have to analyze more variables.

[LOST]

thank u for your guidance.
the shape of envelope is the same as the shape of envelope before splitting but it is bigger due to saturation pressure.
please note that Psat(lab)= 1618 psia Psat(calculated before splitting)= 1450 psia and Psat(calculated after splitting)= 1622 psia
other calculated properties after splitting are much closer to laboratory data than calculated properties before splitting.
so i think that the phase envelope after splitting is much closer to real fluid phase envelope.?!!

i dont undrestand what do u mean? "In a paper draw an envelope and then define your saturation pressure and then draw another envelope 2 times bigger than first one. you have to assure this one pass at the same saturation pressure."

[olmos]

Yes, you are right.

The second one is to show you the importance to evaluate other laboratory properties. You can have two envelopes with the same saturation pressure but with different quality lines.

[Shakespear]

Unfortunately the 4share account (not mine) does not appear to have it :-(

[Shakespear]

This may be of interest to some of you

[link Point to another website Only the registered members can access]

[LOST]

thank u

[LOST]

Dear friend,
would you do me a favour?
i want to simulate a pvt mixture (BLACK OIL) and do a match between lab data and EOS prediction data,
i know that you are expert in this area.
so if you have sometime i will be pleased for your favour.
regards
LOST
the_losts40@yahoo.com

[jamosticker]

Hello guyz, I recently joined this forum. Please can anybody help me to get any of this softwares ECLIPSE AND PROSPER..Please

[Shakespear]

Some free software some may like to check out

[link Point to another website Only the registered members can access]
There are other programs also.