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You need to feel the rod load, feel when the line is fully extended and listen as the fly hits the water".
By transferring the load of liquid column to the tubing on the upstroke, the new pump achieves a smaller polished rod load.
On the basis of in-depth study of the pump, this paper provides a brief formula of the static polished rod load.
The maximum polished rod load happens in upstroke.
The minimum polished rod load happens in downstroke.
Polished rod load includes static load and dynamic load.
Polished rod load at crank angle θ (lbs).
Therefore, only maximum polished rod load is reduced by 11.3%.
So it can reduce the polished rod load (Hicks 1986).
The rod load reduction effects are comparatively analyzed by calculation.
Table 4 Result of polished rod load calculation rod load reducer Maximum polished rod load/N Minimum polished rod load/N Reduction force/N Without a rod load reducer 257,901.3 188,805.8 With a rod load reducer 215,881.4 146,785.9 42,019.9 Reduction 42,019.9 42,019.9 Reduction rate 16.3%22.3%% .
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com