Does MRST has a built in function to compute fluid compressibility for a black oil model with dissolved gas?

[Josimar MIT]

Hi MRST-Dev,

I am looking to learn if MRST has a built in function to compute fluid compressibility for a given fluid structure. I know  that we can compute fluid compressibility using the formation volume factors (as described in the MRST manual), but normally when the fluid structure is constructed we don't have the fluid compressibility by default on it.

I am particularly interested in computing the fluid compressibility for a black oil model with  three phases (water, oil and dissolved gas), specially when there are regions above and below the bubble point.

Let me know if you can help.

Thank you in advance,

Josimar

[Olav Møyner]

Hi Josimar,

We do not have a ready made function for this term, but if you look at the definition for total fluid compressibility in "A Note on IMPES and Some IMPES-Based Simulation Models by K.H. Coats" it should be straightforward to implement. Here is the relevant part:

To calculate c_t you would need to evaluate the shrinkage factors with AD variables for pressure to get the derivatives. Note that in Coats' notation additional inter-phase dissolution is present when compared to your model of interest. For regular black oil it is sufficient to set R_sw = 0, r_s = 0 which greatly simplifies the expressions.

Best regards,

Olav 

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