Reservoir Simulation and History Matching

[Shakespear]

temr

I went to a class that was given by Chuck Kossack (nice guy) on using SIMOPT. This was more than 8 yrs. ago. We used the package to work on simple problems. It looked good BUT .... on a large problem it looked like SIMOPT could be used only to fine tune what was previously done by a "human". What is the state of SIMOPT today I have no idea. Within SLB I did not meet any engineers over 40 yrs old who used it !!!! Do you see what I mean

MEPO is said to be better, but what "better" means I am not sure. Like any tool you need time to learn it. The office and deadlines are not the place to do this.

Now SIMOPT should have IF-THEN tools to allow you to implement your algorithm within it. Did you look at the Tutorials that SIMOPT has to get idea how to do some things? GRADZONE should help identify "variable" that the model is most sensitive to, however be careful that you pick well the data that should be match.

It would be useful for you to look at this thesis

QUANTIFICATION OF UNCERTAINTY DURING HISTORY MATCHING
A Thesis
by
MARTIN GUILLERMO ALVARADO

it can be downloaded from the Net.


coyee

""Practical Reservoir Simulation" by Mike Carlson" so far has not been seen anywhere. If I was you I would look at the book through GOOGLE.Book and capture images using something like SNAGIT. Someone also said that there is a way to capture the book partially since it is not downloadable.

[coyee]

Shakespear, thanks for your suggestion.. I've searched in google and also asked some of my friends, but no one ever download the e-book.

Thank you

[temr]

Shakespear tahnks for information so will try to use Simopt

[Shakespear]

Have a look at the following paper on Error in History Matching. The case used is very simple. I would just read the conclusion of the paper as the rest is rather intensive math.

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[bratek]

Shakespear,

Thank you for your helps, hope that I will have time to discuss with you when I finish my static modeling.
Are you still stay in PL?

Cheers,
Bratek

[Shakespear]

This is an important issue

Reservoir simulation is a versatile tool for reservoir
engineering. Usually CPU-time is the limiting factor when the
simulation model is made. The objective of this paper is to
provide guidelines for choosing black-oil or compositional
reservoir simulators. The paper also recommends procedures
for generation of black-oil PVT tables and for initialization of
black-oil and pseudoized EOS simulation models.
Furthermore, a stepwise component pseudoization procedure
in order to minimize the number of component when a
compositional simulator is required.
Simulated production performance both for injection and
depletion from black-oil and compositional are compared for a
variety of reservoir fluids ranging a medium rich gas
condensate to a critical fluid, to slightly volatile. Both
reservoirs with constant composition and compositional
grading reservoir with depth have been simulated.

You can read here more

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History Matching issues are discussed in this paper

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For beginners

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Dealing with Uncertainty

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[ehsan ali]

@ shakespear
@ temr
my question to both of u is about Gridding (simulation in flogrid). U know in gridding process we make grid blocks of reservoir rock, and we assign various props to these grids( poro, perm, saturation etc.) and these props. vary from one grid block to the other.my question is that how do we come to know at surface about these props. away from well bore, what is the source of this information to us????
this is the question that bothers me...
plz help me .....

[temr]

ehsan ali - this proccess call petrophysical modeling
You have values in 2 wells then using existing algoritms you model property in innerwell space.
During model you can use siesmic attributes which can help to understand you reservoir behavier
so data you use in petro/facies modelling
1. well data
2. Litology
3. Sizes geo bodies
4. Siesmic attributes
look for books here there is a lot of them

[Shakespear]

Ehsan

Something tells me you are using FLOGRID as you mention it. OK, this simplest thing that you could do would be to make maps of properties (por, perm, NTG etc). In the simplest case (we need to think simple as you sound like a beginner) you will have a map for each layer that represents your reservoir.

If you have FLOGRID and its tutorials data sets then I would in your case work STEP-by-STEP through these examples to see how this is done. Print the example text from the PDF file and then study what it is that is being done and do it yourself. Repeat until you understand it well. NO OTHER WAY TO DO THIS, YOU must do the clicking.

If you click on FILE-->COMMANDS-->PLAY COMMANDS, in FLOGRID, then go to the directory tutorials/grainne and chose load_data.cmd. This file has commands to perform a whole series of tasks that someone would need to do to load data into FLOGRID. Such a CMD file allows you to quickly change certain input (maps, wells, logs, etc) and REDO your project quickly.

This also allows YOU to see what was done.

If you run the sim_from_maps.cmd you will see the simulation grid building process, but first chose "NEW Workspace".

Today FLOGRID has been replaced by PETREL which also has the CMD option.

[ehsan ali]

thank you very much of both of you.

[Shakespear]

Good article on Validating a Geologic Model. If this is wrong your simulation model is trash

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[ehsan ali]

In Flogrid when we plan new wells, we can select our desired location for them. My question is that can we change their perforation intervals,( If reservoir consists of several layers and we want to perforate the well not in all layers but only in specific interval). And also can we change their specifications e.g. flow capacity etc in Flogrid??? If yes then how??