Step continuous pressure reduction synergistic oil pumping device and method

Abstract

The invention discloses a step continuous pressure reduction synergistic oil pumping device and method. The device comprises at least three pressure reduction devices which are sequentially connectedin series from bottom to top; the flow speed in the bottommost pressure reduction device is minimal, and the flow speed in the uppermost pressure reduction device is maximal, that is, the flow speedsin the pressure reduction devices which are connected in series together are gradually and sequentially increased from bottom to top; the upper end outlet of the uppermost pressure reduction device isin screw threaded connection with the lower port of a pump cylinder of the pump; and the lower end inlet of the bottommost pressure reduction device is connected with a fixed valve of an oil pipe. The device and the method have the advantages that the step continuous pressure reduction is realized, the liquid phase content is increased, and the pump efficiency is improved; and the pressure reduction devices are connected in series, and the flow speeds in the pressure reduction devices are sequentially increased from bottom to top.

Description

technical field [0001] The invention relates to oil production well operation technology and equipment, in particular to a stepped continuous depressurization and efficiency-enhancing oil pumping device and method. Background technique [0002] The development of low-permeability reservoirs is restricted by many factors, one of the main reasons is that the gas affects the pump efficiency, and the pump inlet pressure of high gas-bearing wells is generally lower than the saturation pressure. When pumping, there is always gas entering the pump along with the liquid. The gas occupies a certain volume in the pump chamber. [0003] The existence of gas affects the filling degree of the pump, which makes the opening of the fixed valve lag and the opening of the floating valve lags behind, which affects the efficiency of liquid inlet and discharge, and the overall system efficiency is low. In serious cases, both the fixed valve and the floating valve cannot be opened. For gas affe...

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Problems solved by technology

[0003] The existence of gas affects the filling degree of the pump, which makes the opening of the fixed valve lag and the opening of the floating valve lags behind, which affects the efficiency of liquid inlet and discharge, and the overall system efficiency is low. In severe cases, neither the fixed valve nor the floating valve can be opened.

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