Anti-Sand Sucker Rod Pump: Engineering Solutions for High-Sand Oil Wells:
In oilfield production, sand interference is the primary cause of downhole pump failure. When sand particles enter the precision clearance between the plunger and the barrel, the result is abrasive wear, plunger sticking, and immediate production loss.
At Dongsheng, we don't just sell pumps; we provide artificial lift strategies engineered to maximize your Mean Time Between Failures (MTBF) in the world’s most challenging reservoirs.
How It Works: The Mechanics of Sand Protection:
To a petroleum engineer, the secret to longevity lies in the stroke. Our anti-sand pumps utilize a specialized Mechanical Scraping System that actively manages solids during every cycle.
The Pumping Cycle Dynamics:
On the Downstroke: The precision-engineered alloy scraping rings on the plunger lead the way, "wiping" the barrel wall clean of sand cake and debris. This maintains a clean surface for the sealing section of the plunger.
On the Upstroke: The scrapers prevent sand from settling into the tight clearance. By optimizing the flow velocity through the valve cage, sand remains suspended in the fluid and is carried out of the pump barrel.
Technical Precision (The Expertise Factor):
We maintain a rigorous fit clearance of 0.002 to 0.005 inches (depending on fluid viscosity and temperature). This specific clearance is tight enough to maintain high volumetric efficiency but loose enough—when combined with our scraping technology—to prevent "sand-lock" during temporary shutdowns.
Technical Comparison: Insert Pumps vs. Tubing Pumps in Sandy Wells
Choosing the right pump type is critical for long-term OpEx reduction. Here is how they compare in sandy environments:
| Feature | Insert Pump (RHB / RHA) | Tubing Pump (TH) |
| Sand Handling | Excellent. Easier to integrate specialized sand scrapers. | Moderate. Prone to "sand bridging" above the plunger. |
| Workover Cost | Low. The entire pump can be pulled via the rod string. | High. Requires pulling the entire tubing string. |
| Volumetric Capacity | Limited by the ID of the tubing. | Maximum possible for a given tubing size. |
| The Dongsheng Verdict | Recommended for high-sand wells to minimize workover downtime. | Recommended only for high-volume wells with mild sand. |
Material Science: Tungsten Carbide vs. Standard Chrome
Why do Dongsheng pumps last longer? We invest in superior surface metallurgy.
Standard API Pumps: Often use Chrome plating (approx. 800-900 HV). While good for friction, it can be "pitted" by hard quartz sand.
Dongsheng Premium Series: We offer Tungsten Carbide (TC) Thermal Spraying on both the plunger and barrel. With a hardness of HV1100-1300, TC is virtually impervious to the scouring action of sand, extending the pump's wear life by 300% to 500% compared to standard materials.
FAQ:
Q: What is the maximum sand concentration Dongshenf pumps can handle?
A: Our specialized RHBM-style anti-sand pumps can effectively manage sand concentrations up to 1.5% - 3.0% by volume, depending on the particle size and fluid viscosity.
Q: Can these pumps handle High-Viscosity (Heavy) Oil?
A: Yes. For heavy oil, we adjust the valve cage design to reduce flow resistance and use oversized balls/seats to ensure the valves close promptly even in thick fluids.
Q: Are Dongsheng pumps compliant with API 11AX?
A: Absolutely. All Dongsheng rod pumps are manufactured in API-certified facilities, ensuring that all threads, clearances, and material grades meet or exceed international oilfield standards.
Conclusion & Resources
Optimizing your wells' performance requires more than just a standard pump; it requires an engineered solution. Dongsheng combines decades of field experience with advanced material science to keep your oil flowing.