Location: Mangistau region
The deposit: 2 oilfields under NDA
Task:
Determining the liquid level in the annular space of wells where it is impossible to obtain results using standard echo sounders.
Solution:
Provided high-precision digital echo meter
Result:
In the process of carrying out work using the provided equipment, the following tasks were achieved:
- We measured the speed of sound of the annular gas, and recorded the liquid level in wells at depths of up to 3 km, which a standard echo sounder could not record.
- We measured fluid levels in wells with very low pressure. Standard echo sounders also could not return the level.
- In a well with a complication in the form of foaming, the level was drawn. When recalculating Rzab, the accuracy was 5%,
Results of level testing in wells with low reservoir pressure
| Well | Casing pressure, bar | Liquid level, m |
|---|---|---|
| A | 0,08 | 285 |
| B | 0,20 | 711 |
| C | 0,09 | 1272 |
| D | 0,08 | 552 |
Results of level marking in wells with low liquid levels
Foam, increasing the determined level, introduces a large error when taking measurements with standard echo sounders. It was decided to conduct a test beating of levels with a high-precision ultrasonic echo sounder and check the convergence of the obtained values with the data from the TMS. The following results were obtained:
| Well | Annular pressure measured from TMS, bar | Recalculated annular pressure (determined by echo sounder), m |
|---|---|---|
| A | 50,3 | 47,5 |
| B | 19,7 | 18,7 |
| C | 21,0 | 20,6 |
As a result, high data convergence was obtained.
Results of determining levels in wells complicated by foaming
Foam, increasing the determined level, introduces a large error when taking measurements with standard echo sounders. It was decided to conduct a test beating of levels with a high-precision ultrasonic echo sounder and check the convergence of the obtained values with the data from the TMS. The following results were obtained:
| Well | Annular pressure measured from TMS, bar | Recalculated annular pressure (determined by echo sounder), m |
|---|---|---|
| A | 50,3 | 47,5 |
| B | 19,7 | 18,7 |
| C | 21,0 | 20,6 |
As a result, high data convergence was obtained.
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