A downhole circulating valve that switches between normal and external circulation through a sequence of rubber and steel balls. The design allows repeated circulation changes without pulling the string.
| Parameter | PTF121 | PTF165 | PTF203 |
|---|---|---|---|
| Tool OD | 4¾"（121mm） | 6½"（165mm） | 8"（203mm） |
| Tool ID | 1¼"（31.75mm） | 2"（50mm） | 2.36"（60mm） |
| Tool length (mm) | 1100 | 1200 | 1300 |
| Maximum tensile load (kN) | 2200 | 5500 | 7920 |
| Maximum flow rate (L/s) | 23 | 47 | 65 |
| Minimum flow rate (L/s) | 11 | 23 | 35 |
| Minimum torque capacity (kN·m) | 40 | 68 | 150 |
| Flow area before ball drop (mm²) | 1256 | 1750 | 3316.6 |
| External-circulation flow area (mm²) | 615.4 | 780 | 1775.9 |
| Normal-circulation flow area (mm²) | 632.5 | 1260 | 1358.3 |
| Temperature rating (°C) | 150 | 150 | 150 |
| Maximum differential pressure (MPa) | 35 | 35 | 35 |
| Ball diameter (mm) | 36、38、40 | 55、57.5、60 | 62、63、65 |
| Pre-activation pressure drop, water (MPa) | 0.4（18L/s） | 0.6（28L/s） | 0.7（63 L/s） |
Used for lost-circulation response, workover, completion, horizontal drilling, acidizing, coring and underbalanced drilling.
YUXIN combines product engineering, machining, assembly, inspection and export coordination in Dongying, Shandong.
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