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TheCirculating heavy oil well pump is a improved type of the hydraulic feed-back pump for heavy crude oil.Not only the former advantages have been remained but the inflow valve has been changed to be a annular valve in this kind of pump，which obtains a large flow area and shortens the inflow tubing ，so the inflow resistance is decreased .In the meantime ，for using a long plunger and a short barrel in lower pump，the phenomenon of sand-up can be efficiently avoided .The pump is suitable for 7” casing well，the pumpφ57/φ38 may be used in 5 1/2”casing well.
Pump bore （mm） | Length of plunger（m） | Length of barrel（m） | Range of Stroke （m） | Size of connecting Tubing （in） | Size of connecting sucker rod | Pump constant | Max outside diameter （mm） | ||
Upper Plunger （m） | Lower Plunger （m） | Upper barrel （m） | Lower barrel （m） | ||||||
57/38 | 2 1/2 TBG | CYG19 | 1.91 | ||||||
70/38 | 3 TBG | CYG19 | 3.91 | ||||||
70/44 | 0.6～1.2 | 2.4～7.2 | 3.0～7.8 | 0.6～1.2 | 1.8～6.0 | 3 TBG | CYG22 | 3.35 | 142 |
83/44 | 3 1/2 TBG | CYG25 | 5.60 | ||||||
83/57 | 3 1/2 TBG | CYG25 | 4.25 | ||||||
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