The segmented CM can be used where unknown BHPs change during the analysis interval. The compensated CM overcomes the requirement to rerun the model after adding a new producer or after shutting-in an existing producer. If both BHP changes and shut-in periods occur, both modified CMs can be used simultaneously to construct a single model for a period of data.
In several simulated cases with unmeasured fluctuating BHPs, the segmented and compensated CM successfully determined the true interwell connectivities. Ignoring the BHP data typically gave 2-10 times the root mean squared error of the segmented/compensated CMs. In an application to North Buck Draw field, which both lacks BHP data and has several producer shut-ins, the CM connectivity parameters were compared to the tracer test results and an earlier geological study. We observed good agreement between the modified CM and the amounts of higher-quality fluvial facies in the system. Also, the CM results correlated better with the results from tracer tests run in the field than when the unmodified CM was applied.