The equipment was development by AO NPP VNIIGIS in cooperation with OOO NPF VNIIGIS-TZS
FEATURES AND ADVANTAGES
- Separate determination of wall thickness and metal loss in three casing strings (EMDS-3) and four casings (EMDS-4)
- Undesirable noise discrimination using gradient of static magnetic field measurement
- Inspection of casing strings with four electromagnetic probes with different direction of magnetic axis of sensors
- EMDS-3 and EMDS-4 tools have examined more than 2000 wells in Russia, China, the Middle East
- Availability of GR and temperature sensors
Specifications
| EMDS-3 (EMDS-ТМ-42) | EMDS-4 | |
| Maximum diameter of the pipes inspected, mm | 340 | 550 |
| Total wall thickness of pipes, mm | 30 | 40 |
| Basic accuracy of thickness determination, %: First casing string Second casing Third casing Fourth casing | 5 10 15 – | 5 10 15 25 |
| Minimal length of the detected through defect Along the pipe axis: First casing Second casing Third casing Fourth casing Crosswise to the axis of the first pipe | р/9 р/4 р/3 - р/6 | р/9 р/4 р/3 р/2 р/6 |
| Temperature range, °С | 0 – 120 (150) | 0 – 120 (150) |
| Temperature sensor sensitivity, °С | 0,01 | 0,01 |
| Range of natural gamma radiation, µR/hr | 3–100 | 3–100 |
| Max.operating temperature, °С | 120 (150) | 120 (150) |
| Max. hydrostatic pressure, MPa | 60 (80) | 60 |
| Tool diameter, mm | 42 (48) | 58 |
| Tool length with centralizers, mm | 3700 | 3700 |
Download the equipment card