Consistency and accuracy in solids control are essential for every drilling operation. To ensure uniform quality and performance,
the American Petroleum Institute (API) established a global standard—API RP 13C—for classifying shaker screens.
This standard allows operators and suppliers to communicate clearly about screen cut point, conductance,
and separation performance. Understanding API standards is vital to selecting the right shaker screen and optimizing the solids control process.
1. What are API standards?
API RP 13C defines a test procedure and labeling method for shaker screens.
It ensures that screens from different manufacturers can be compared based on measurable performance, not marketing terms.
2. The meaning of API numbers
Each API number (e.g., API 120, API 170) represents the size range of particles the screen can separate.
Higher numbers correspond to finer screens and smaller particle retention.
3. Benefits of standardized testing
Ensures predictable solids removal efficiency.
Reduces risk of mismatched screens in multi-brand systems.
Supports data-based decisions for drilling fluid management.
4. Selecting the correct API screen
Match API rating to expected particle size and drilling fluid type.
Use coarser screens in the first stage and finer screens in the final stage for best results.
5. Operational impact
Proper API-rated screens improve fluid recovery, extend equipment life, and stabilize wellbore conditions.
Non-compliant screens often cause inefficiency and higher costs.
API standards bring reliability and consistency to shaker screen selection. By following these guidelines,
operators can improve solids control, reduce fluid loss, and enhance drilling efficiency across all environments—from oilfields to HDD projects.
