Well testing_Horner Plot vs Derivatives?

[izimrat]

Hi all
I'm actually need some advise from all of you to share your view and guidance to explain/ solve the following problem;

I have defined the basic reservoir parameters i.e. P* (Pr initial), skin and permeability using the Horner plot for my build-up pressure.
And at the same time, I used derivatives plot to interpret the reservoir boundary by regressing some parameters (Pr, Skin, C, K etc) until reasonable match on the history plot (rate and pressure) & derivatives plot are obtained.
I managed to get good conformance for history and derivatives plot in this case but then initial pressure, Skin and permeability are different with the parameters defined from the Horner plot.

I appreciate your advise on how to solve this problem. I tried to use the derived parameters from Horner plot but then I can not match the history plot (rate and pressure) with poor derivative matching.

Please advise..really need yr help

[izimrat]

42 views but no reply from all of you....I hope to hear some advise from you all...what would be the best approach to solve the above problem...

[06pg22]

How much difference you found in results from Horner and Log-Log plot?

[petengr]

The difference you got is inevitable, however, it should be within acceptable range. You got to judge that yourself. The results from the semi-log, Cartesian plots depends on where every flow period, e.g ETR(C), MTR(K,s), LTR(boundary) begins and ends and that up to the engineer. This results are then taken as an input for the match so we can validate the models used to describe every period.

[izimrat]

Skin and Permeability seem OK..the difference just 1%-2% but the P* and Pi is about 150 psia pressure diff..is it OK?
Just for the info..this is exploration well..

[izimrat]

The difference you got is inevitable, however, it should be within acceptable range. You got to judge that yourself. The results from the semi-log, Cartesian plots depends on where every flow period, e.g ETR(C), MTR(K,s), LTR(boundary) begins and ends and that up to the engineer. This results are then taken as an input for the match so we can validate the models used to describe every period.

Thank you for your explanation.