关键词: 采油井, 抽油泵, 阀罩, 偏磨, 泵效, 使用寿命

Abstract: This paper introduces two kinds of subsurface pumps used for tertiary oil production wells. When used in polymer and ternary compound solution flooding oil wells, the service life of pump can be extended, the pump-inspecting period can be shortened and the productivity of oil wells is improved. One is the big-channel high-efficiency subsurface pump, which increases pump barrel and plunger clearance, adopts a special valve cage design and the double closed plunger valve cage structure and improves the stress state of top open valve cage, solving the fracture problem of top open valve cage. The closed valve cages of plunger and pump barrel are redesigned to have a larger valve chamber and change the inner structure of valve cage, solving the problem of internal pile and satisfying the demand for heavy oil production. The other is the immersion anti-drag subsurface pump, which adopts a “small pump in the upper part and big pump in the lower part” structure. Since the inlet oil valve and outlet oil valve are installed in the plunger, tubing fluid column pressure is exerted on the plunger, forcing the plunger to overcome resistance of heavy oil, reducing the bending and deformation of sucker rod in the lower trip and alleviating eccentric wear on rod string. Correspondingly, the electric motor consumes less energy.

Key words: oil producing well, subsurface pump, valve cage, eccentric wear, pump efficiency, service life