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A blown-up view at the beginning of one of the longest build-up is presented on the above
figure. Note that the corrected production is a representation of the surface rates. When
downhole rates are present and we have soft shut-ins of the kind above, it may be preferable
to define the build-ups only at the time when the downhole rate vanishes. This is beyond the
scope of this session.
By applying this formula we can see here that the rate now is strictly zero when the build up
indicator is 1 (means that a shut-in is selected), eliminating thus potential noises when there is
no flow, and strictly cut to zero at the start of shut-in for synchronization with pressure
history.
E.7. Creating Other Derived Channels
Derived channels are the results of any calculations that can be required by the user.
Any data channel can be used in the formula written by the user in the dialog accessed by
pressing in the top toolbar.
The user can select within basic operation types and within standard mathematical functions
by pressing .