Reservoir image from production data 1

[ppata]

Hi,
I have an ideea and I want to talk about.

During a discution about a new well on a a reservoir, the big question it was about the location, because from seismic image(2D) we seen a fault. the discution start with the question: where do we put the location(?), in wich side of the fault. At that moment I told them to make some well hidrodinamical tests in the neighbourhood wells, and after that to decide on the location.
That was the start, but after that I was thinking about other ways to improuve the image of the reservoir.
What do you think about that: if I have good production data, I can estimate a drainage area for all the wells in the neighbourhood; by analising the production curves I can see if in some of that wells I have atipical behaviour that mean I have a fault; next step is to make an analisys on presure evolution on bouth reservoirs divided by that fault and from that I can estimate the volumes; when I will wave all that data I will put that together and with a geometrical analisys I will have a description of the reservoirs and the fault. Probably I do not need to explain you that my simulator is ms excel and I just dreaming to work with RTA, Saphire or other softwares.
I hope you will find the time to give me some critical answers for that ideea.
Thank you,
A.
Do

 

[DrillerNic]

Nothing wrong with doing reservoir engineering with MS Excel....classical Material Balance type reservoir engineering calulations can be doen with excel easily. One example: a gas field, with three fault blocks, one fault block undrained, the block next to it with one well. Doing classical P/Z plots in excel for the well showed a nice straight line until reservoir pressure had dropped by about 300psi, then an increase in Gas in place.... How? the suggestion was that the fault was partially sealing, and that the reduced reservoir pressure now meant the well was 'seeing' some of the gas in the undrained fault block. We drilled a well in that block and a pressure survey suggested the fault block was slightly depleted... smug faces all round on the Petroleum and Reservoir Engineers!

So you can use Material Balance techniques and Transient Well Testing to see if the fault is sealing (don't forget the fault may possibly be an artefact of the seismic processing!). If it's not sealing or only partially sealing, it then becomes a question of the economics of an increase in production rate with a new well the other side of the fault, rather than the economics of a new well to get at new reserves.