Split pressure reducing valve and method

Abstract

The invention discloses a split pressure reducing valve. The split pressure reducing valve comprises an outer pipe, a lower inner pipe, a lower valve seat and a lower pressure reducing valve element, wherein the lower end of the outer pipe is connected to the outer wall of the upper end of a lower connector; the lower end of the lower inner pipe is connected to the inner wall of the upper end of the lower connector; an annular channel is formed between the outer wall of the lower inner pipe and the inner wall of the outer pipe; the lower end of the lower valve seat is connected to the upper end of the lower inner pipe; and the lower pressure reducing valve element is arranged on the outer wall of a pull rod in a sleeving mode, an outwards-protruding annular table is arranged on the outer wall of the lower pressure reducing valve element, and the outer diameter of the outwards-protruding annular table is larger than the inner diameter of the minimum position of the inner wall of the lower valve seat. According to the split pressure reducing valve, when an oil pumping pipe column stretches out and draws back alternately, a sleeve cannot be abraded, the service life of the sleeve is long, the production time of an oil well can be prolonged, and the economic benefits of the oil well can be increased.

Description

technical field [0001] The invention relates to the technical field of oil production equipment, in particular to a split valve pressure reducing valve and a method. Background technique [0002] At present, there are more than 2,300 low-permeability oil wells in Shengli Oilfield. These oil wells have the characteristics of large differences in layer permeability, low reservoir permeability, and deep burial. These oil wells are polluted by mud during drilling and clogged by solid particles during well washing operations, so the reservoir output is low, and it is difficult to remove the clogging by conventional plugging removal technology; in addition, the high permeability layer affects the output of the low permeability oil layer, resulting in oil well productivity. decline. [0003] In the previous research, ZL201520499755.0, an oil-inlet and liquid-discharging anti-airlock pump at the top of the pump barrel, was formed. This technology uses a sealed valve body to reduce ...

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Problems solved by technology

These oil wells are polluted by mud during drilling and clogged by solid particles during well washing operations, so the reservoir output is low, and it is difficult to remove the clogging by conventional plugging removal technology; in addition, the high permeability layer affects the output of the low permeability oil layer, resulting in oil well productivity. decline

[0003] In the previous research, ZL201520499755.0, an oil-inlet and liquid-discharging anti-airlock pump at the top of the pump barrel, was formed. This technology uses a sealed valve body to reduce the opening pressure of the floating valve. It is difficult to connect with the device, which limits the application; ZL200920224045.1 zero-air-lock gas-liquid mixed pumping deep well pump adopts the structure of the intermediate gas bag to perform gas-liquid replacement, which can release the gas-lock effect of low gas content wells. For high gas content wells, it still cannot Solve the air lock

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