Double-pumping-prevention oil pump

Abstract

The invention discloses a double-pumping-prevention oil pump. The double-pumping-prevention oil pump comprises a pump barrel, wherein the pump barrel is connected with a working barrel through an upper joint; the pump barrel is connected with a bias fixed valve through a lower joint; a ring valve seat is fixed on the working barrel; a sliding sleeve sleeves the outside of a slipping rod; a ring-shaped valve plug is fixed at the upper end of the sliding sleeve; and the ring-shaped valve plug is matched with the ring valve seat. According to the double-pumping-prevention oil pump, because the ring-shaped valve plug is used in the pump, the ring-shaped valve plug is closed in a downward stroke, liquid column high pressure exists above the valve plug, the inside of a pump cavity has low pressure, a rod string is stretched by pressure difference, and the circumstance that eccentric wear of a rod tube is caused by bending of the rod string is avoided; and in down stroke, down pull force caused by difference of pressures of the upper end surface and the lower end surface of the slipping rod is increased, and thus, downward polished rod load is higher than downward polished rod load when aconventional pump is used. When in up stroke, due to opening of the ring-shaped valve plug, the same pressure system is arranged above a plunger, under the condition that the pump diameter is not changed, upward polished rod load is the same as that of the conventional pump, up load is not changed, down load is increased, action of a suspension point is relieved, and therefore, an energy-saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of oil production in oil fields, and relates to a double anti-oil pump. Background technique [0002] During the pumping process of the pumping well, during the downstroke, the lower end surface of the sucker rod string will bear the high pressure of the liquid column, and at the same time, it will also be affected by the resistance of the well fluid along the journey and the local resistance at the large diameter node of the rod string. Under axial pressure, the middle and lower part will produce unstable bending, and the bending peak pressure will run on the pipe wall, which will cause eccentric wear of the rod and tube, resulting in pipe leakage and broken rod, which will not only cause the loss of the rod and tube, but also shorten the pump inspection period. shorten. [0003] In addition, many oil wells will cause pump jams due to formation sand or other impurities entering the pump. Therefore, solving...

AI Technical Summary

Problems solved by technology

Because the sand control screen used under the pump is to enter the liquid through the fine pores, the sand is blocked outside the sand control tube, so that it cannot enter the pump, but it will block the liquid inlet channel of the screen. The more viscous the well fluid, the faster the blockage, resulting in The oil well needs to check the pump due to the clogging of the sand control screen; however, adding scrapers and sand control grooves to the internal structure of the pump only shifts the position of the sand partially, and fails to solve the problem of the outlet of the sand entering the pump, and the sand still remains. in the pump, so it doesn't solve the problem very well

[0006] To sum up, the existing technology has not fundamentally solved the problems of partial wear prevention and sand prevention of oil well pumps

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