Development and Performance Research of New Small Displacement Pump with Solid Plunger and Non-coaxial Delivery Valve

Author(s): Feng Zi-ming*, Duan Weibo, Cui Wei*

Journal Name: Recent Patents on Engineering

Volume 13 , Issue 4 , 2019

Become EABM
Become Reviewer

Graphical Abstract:


Background: After the oilfield development coming into the middle and later periods, many oil wells only had liquid production less than 5m3 per day, therefore the present sucker-rod pumps didn’t satisfy the need for oilfield production. We revised all patents relating to small displacement pump and didn’t found any suitable pump for low production well. A new type of pump with small diameter was needed to design for solving the unbalance between the production and feed in lower production wells.

Objective: To resolve the problems of supply and production imbalance of the low producing well, low pump efficiency and low system efficiency, a low displacement pump with non-coaxial delivery valve had been designed.

Methods: This type pump adopted a solid plunger, and its delivery valve was not coaxial with the pump axial that would enhance its structural strength and been useful to reduce the partial flow loss of oil flowing through the static pump valve. At the down dead point of pump plunger, the delivery valve was located at the top of the pump chamber that was to the benefit of discharge of the gas and the oil from the pump chamber. The uneven distribution of the delivery hole was suitable for the wellhead diameter of the traditional oil wells.

Results: The delivery valve was non-coaxial with the plunger that would decrease the flow loss through the passage and increase the pump efficiency. At the down-dead point, the plunger entered the extension nipple, and the delivery valve was located up the end of the solid plunger that promoted the remnant gas flowing out of the pump cylinder and decreased the effect of gas on the pump efficiency.

Conclusion: As to this low displacement pump, we suggested: The suitable stroke was 2-3m; the stroke frequency was less than 3min-1. A reasonable range of submersible depth for low production well was 200-300m. It was used in the gas content well lower than 20%, else used the gas anchor firstly. The low displacement pump with non-coaxial delivery valve and solid plunger (NLDP) can improve the pump efficiency and reduce the polish rod load. At the same time, this NLDP provides new equipment for the production of the low oil well and improves the artificial lift design theory.

Keywords: Low production well, supply and production imbalance, low displacement, non-coaxial delivery valve, solid plunger, displacement pump.

W.T. Qu, X.G. Sun, and J.S. Gou, "A small displacement annular-plunger rod pump", China Pet. Mach., vol. 44, pp. 100-102, 2016.
H.Y. Yuan, C. Li, and B.Z. Wang, "Study and application of Φ28mm working barrel pump", Oil Field Equip., vol. 40, pp. 42-48, 2011.
W. Zhang, "Anti-breaking structure optimization of oil well pump plunger", China Pet. Mach., vol. 44, pp. 105-108, 2016.
D.F. Song, Solid plunger oil pump. CN Patent 2366583, 2000M
B.Z. Wang, L.F. Zhang, and M. Li, Pump-cylinder-enhanced small-pump-diameter whole cylinder oil well pump. CN Patent 203627168, 2014
Y. Peng, W.H. Yan, and P. Gao, Piston-type low diameter oil pump with external dual valves. CN Patent 103334921, 2013
B.Z. Ma, Solid plunger de-loading oil-well pump. CN Patent 202768353, 2013
Y.J. Zhao, F. Shen, and Q.H. Gao, Multifunctional solid plunger piston tubing pump. CN Patent 103437984, 2013
W.T. Qu, Y.X. Guo, and Y.P. Sun, Lateral flow backwashing soft sealing solid plunger pump. CN Patent 203146288, 2013.
W.T. Qu, X.G. Sun, and B.F. Yuan, Small-displacement rod type of oil well pump with an annular plunger. CN Patent 103883503, 2014
D.C. Shen, W.C. Ai, and Z.S. Sheng, Oil Well Pump., Beijing Petroleum Industry Press , 1994.
J.L. Xu, L.Z. Li, and Y. Luo, "Development and application of model SCYB small displacement solid plunger pump", China Pet. Mach, vol. 37, pp. 48-49, 2009.
X.Q. Lv, "Study and application of solid plunger in double-action pumping unit", Oil Field Equip., vol. 45, pp. 93-95, 2016.
S.D. Sun, "Optimize design and matching technology for solid plunger pump", Gas-Oil Field Eng, vol. 32, pp. 12-13, 2013.
T.L. Zhao, "Development and application of anti-airlock feedback pump of gas-liquid replacement type", Oil Drill. & Prod. Tech., vol. 36, pp. 128-130, 2014.
X.F. Li, The design and performance simulation of external valve small displacement pump. Harbin Engineering University, Harbin, China, 2011.
B.Z. Wang, Y.L. Wang, and L.F. Zhang, "Development and application of ϕ25mm long-plunger short-barrel tubular pump", China Pet. Mach, vol. 41, pp. 102-104, 2013.

Rights & PermissionsPrintExport Cite as

Article Details

Year: 2019
Page: [455 - 461]
Pages: 7
DOI: 10.2174/1872212113666181127152417
Price: $25

Article Metrics

PDF: 20
PRC: 1