Surface Drive and PC pump (Progressive Cavity Pump) is a kind of high-efficiency and energy-saving artificial lift system, which is composed of surface drive and downhole PC pump. Surface drive suspends and rotates rod string and power is then transmitted downhole, which in turn drives the PC pump.
PC pump consists of two parts: rotor and stator. The high strength, chrome-plated rotor is the only moving part of PC pump. Stator is a kind of tube with elastic synthetic rubber molded inside. A variety of elastomeric is available for different applications.
1. Polished Rod Coupling 2. Polished Rod
3. Tension Clamp, Polished Rod clamp, Protection Net
4. Sheave, V-belt, Belt Guard
5. Motor 6. Housing, Gearbox 7. Level Gauge
8. Rings 9. Rail, Motor Mounting 10.Stuffing Box Cap
11. Stuffing Box 12. Standing Strut
Technical Specification
| Model | Speed Range | Gear Allowable Max. Torque | Power Range | Recommended Max. Axial Torque |
|---|---|---|---|---|
| LBQ5B | 50～330rpm | 2500N·m | 11～37kW | 150kN |
| LBQ5Y | 50～330rpm | 2500N·m | 11～37kW | 150kN |
| LBQ2 | 120～500rpm | 2000N·m | 11～37kW | 100kN |
| LBQ6 | 50～200rpm | 1500N·m | 7.5～22kW | 80kN |
| LBQ5D | 60～200rpm | 3000N·m | 22～55kW | 200kN |
| LBQV3 | 50～330rpm | 1500N·m | 11～55kW | 150kN |
| LZQ | 0～200rpm | – | 11～45kW | 200kN |
The surface drive is a specific device to suspend and rotate the sucker rod, which in turn drives the PC pump. Then fluid can be brought to the surface by continuous movement of rotor within stator. When unit stops the surface drive absorbs reversion torque stored on sucker rod and releases the torque gradually so that thread off can be avoided. Since the stored energy is released, the safety of units and operators can be ensured.
| Model | Gear Ratio | Max Allowable Torqu Nm |
Max Axial Load KN |
Max Power KW |
Working Speed rpm |
Remark |
|---|---|---|---|---|---|---|
| GBF2 | 2.1 | 2000 | 150 | 37 | 150-500 | Hollow Shaft&Stuffing Box |
| GBF5B | 4.6 | 2500 | 200 | 37 | 70-250 | Hollow Shaft&Stuffing Box |
| GBF5D | 4.9 | 3000 | 250 | 75 | 70-250 | Hollow Shaft&Mechanical Seal |
| GBF6 | 6.17 | 1500 | 150 | 22 | 50-200 | Hollow Shaft&Stuffing Box |
| VED | 2000 | 150 | 45 | 250-500 | Hollow Shaft&Stuffing Box |
When working normally, the overrunning clutch does not work, and the output shaft directly drives the sucker rod and polished rod to rotate. During downtime and reversal, overrunning clutch works, sucker rod drives the overrunning clutch inversion, reversed blade with eccentric casing wall closely contact, through the small gap discharge of oil, to its resistance to slow, thus making the reversal stop in a short time.
- No manual operation，automatic brake and well shut-down；No Sparks; Brake by inner housing movement.
- Specially suitable for gas wells，safe and reliable.
- Flexible shut-down, not hard braking, slow full release of torque, very safe for subsequent operations; It can effectively prevent the rod from unlocking.