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Supplement 2. Setting of a user sound speed correction table
When monitoring the fluid level, an operator can select and set a
user correction table according to which the tool determines an acoustic
wave velocity which is either a function of a just measured annulus
pressure or a function of the pressure and the level. In addition to it, it is
possible to select tables recorded in the tool’s storage as well as tables
transferred to the tool’s storage from a computer database.
Warning! According to our data, the sound velocity in wells can
greatly vary even within one and the same field. Therefore, it is highly
recommended to use your (applied for your region) correction table
for an individual field or a group of wells within the field. In any case,
the tool will display a level basing only on the sound velocity that has
been set in it!
In the fixed storage of the tool there are tables constructed
according to averaged data of appropriate regions and intended for general
use. They can be used only for a rough level evaluation. The tables are
marked with conventional codes and titles (see Supplement 3):
Table 1 titled “Langepas” is intended for Siberian regions;
Table 2 titled “Tartaria” is intended for Tatarstan.
In addition to the above mentioned general tables, user tables (up to 4
pcs.), adopted for specific NGDU, field conditions, etc., can be written into
the level gauge's RAM. The numbers of user tables can be from 10 to 63.
The user tables are recorded in a computer session simultaneously with the
transfer of parameters and level control results to the measurement and
echogram database. (Work with the database, including creation and use of
user tables, is described in detail in the document SUDOS DB-Graph
Measurement and Echogram Database. User Manual" included in the
device delivery set). The sound speed in the custom tables can be from
250m/s to 505m/s.
Enter mode 7)
Correction
(table) to set the working correction table.
The previously set work table number is shown in the display in flashing
digits.
Summary of Contents for SUDOS-mini 2
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