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Ecrin v4.20 - Doc v4.20.01 - © KAPPA 1988-2011 Diamant Master Guided Session #1 • DmmGS01 - 21/33
E.6 Shut-in identification and its use
In the following sections we are going to view a few specific functionalities that have been
developed in Diamant Master in order to help the engineer to tackle specific reservoir-
surveillance-oriented tasks.
In our current pressure dataset EcrGS01p, a number of Build-ups are visible on the pressure
history. Yet the rate history of Well#1, loaded from the raw downhole permanent sensor is
unlikely to present clear null sections synchronized with the pressure history, which is however
essential for analysis. In order to ensure synchronization between rate and pressure for
analysis, the engineer first needs to tag the existing shut-in periods as such. This could be a
very lengthy task for a long history over time but we will see how we can speed up this pre-
processing task in Diamant Master.
E.6.1 Shut-in indicator
Select the EcrGS01p filtered pressure data node in the data tree (in Plot view and not in table
view); at the far right of the Plot toolbar there are several options with the ‘Shut-ins’ title.
First, lock the pressure history for shut-ins edition in order to enable the functionalities,
you will then see this toolbar .
This first icon is used to display the build-up indicator channel, a logical channel equal to 1
inside build-ups, 0 outside, which will be used later on for pressure / production
synchronization. Since we have not defined any build-up yet in the history, this will not cause
any change in the display.
The second icon, disabled at this point, can be used to set a time selection as a build-up.
To enable this option you need first to select period with , then select to confirm it is a
well shut in. This is the classic manual selection tool.
The third button runs a semi-automatic option to define build-up. The principle of this
option is to pick any points within a build-up, and to let Diamant find the start and end times
automatically. After enabling this option just click anywhere in the period and the shut in will
be defined.
The fourth button is a fully-automatic option to define shut-ins periods. This time the
algorithm will automatically find all the shut-in periods for you, based on a minimum duration
and delta p settings. We will demonstrate in details the use of this option in E6.3
For the moment, let us select the longest shut-in as shown, using the semi-automatic function
click anywhere in the build up to define it, then click on and pick it again to select it
for use, unlock the channel: