Rod String Design
Calculate stress, safety factor, total weight, and max allowable load for sucker rod strings in beam pump wells.
Well & Pump Parameters
Rod Sections (bottom to top)
Section 1 is at the bottom (near pump), Section 3 is at the top (near surface). Change size to auto-fill weight and area.
Results
Total Rod Weight (air)
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Buoyed Rod Weight
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Max Load at Surface
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Section Analysis
| Sec | Size | Grade | Length | Weight | Load at Top | Stress | Yield | SF |
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How this was calculated
Rod weight: Section weight = wt_per_ft * length. Buoyed = air_weight * (1 - fluid_SG / 7.85).
Load at top: Cumulative buoyed weight of all sections below plus fluid load.
Stress: Load / cross-sectional area. Safety Factor: Yield Strength / Stress.
Grades: D = 115,000 psi, C = 90,000 psi, K = 85,000 psi.
Need help with rod string optimization, beam pump design, or artificial lift selection?
Book a free strategy call →Understanding Rod String Design
Sucker rod string design is critical for beam pump artificial lift systems. The rod string must withstand combined loads of its own weight, the fluid column, and dynamic forces during pumping. A tapered design uses larger rods at the top where stress is highest.
The safety factor at each section must exceed minimums to account for fatigue, corrosion, and dynamic loading. Grade D rods allow deeper settings but are more susceptible to corrosion fatigue. Grade C and K offer better corrosion resistance for H2S/CO2 environments.
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