Fixed-valve, retrievable tubing pumps are designed and manufactured in accordance with API SPEC 11AX.
The fixed valve is anchored and sealed to the pump barrel by either a mechanical device or cup-type packer and is supplied with a dedicated puller. By simply lifting the sucker-rod string, the whole valve assembly can be withdrawn, allowing direct communication between tubing and annulus.
Integral-barrel, extra-long-stroke rod pumps are designed and manufactured to GB/T 18607.
Key advantages:
• Simple structure
• Low cost
• Larger pump diameter can be installed in the same tubing size
• Higher displacement
| Standard | Model | Nominal Ø (mm) | Plunger Length (m) | Stroke (m) | Pumping Rate (m³/d) | Tubing Thread | Rod Thread |
|---|---|---|---|---|---|---|---|
| GB/T 18607 | 25-12STH | 32 | — | 20–30 | 1.163 | 2-7/8 | 3/4 |
| 25-15OTH | 38 | — | 20–30 | 1.642 | |||
| 25-175TH | 44 | 0.6 / 0.9 / 1.2 / 1.5 | 20–30 | 2.235 | |||
| 25-225TH | 57 | — | 20–30 | 3.694 | |||
| API SPEC 11AX | 20-175THC/M | 44 | — | 0.6–0.8 | 2.235 | 2-3/8 | 3/4 |
| 25-175THC/M | 44 | — | 0.6–0.8 | 2.235 | 2-7/8 | ||
| 25-225THC/M | 57 | — | 0.6–0.8 | 3.694 | 2-7/8 |