a question in reservoir

[amahaminer]

Should the API of crude produced from several wells in the same reservoir be equall?
if it can change, what is the range that it change among?

[vergatario]

If the reservoir has litle dip and the thickness is los (less say less than 40 feet), you must have the same API gravity at surface conditions. If you have these condition but you obtain differences in the API gravity, it is posible that you may have some geological heterogeinity that is causing the problem (Faults ?, no sand continuity ?). Geochestry may help in this kind osf situations.

[Shakespear]

Your timing is excellent

[link Point to another website Only the registered members can access]
Go to this link and download Thursday Session video 3. The first 40 minutes has no sound so skip it. After this he will talk about variation in PVT properties areally and vertically. Here you will hear something regarding your question.

Good samples and good PVT analysis can tell you if you have this issue. Otherwise bad data and/or bad PVT lab work can make you think you have this. So you have to think carefully before making this judgment.

I am about to ask for two SPE papers mentioned in that video. If our Forum friends upload them it will be worth reading them.

[amahaminer]

thanks alot for ur ur quick reply i am downloading the files now

[ahmedm]

if you have the api with different conditions of P & T maybe
Or different readings from different lab measurments
Try to
QC them using some correlations

You can get differnt readings if you have different systems
I mean more than one formation please check with your geoogist or the ddevelopment geologist


Hope this can help you