Gas-liquid-solid separation device in shaft and design method thereof

Abstract

The invention provides a gas-liquid-solid separation device in a shaft. The upper end of an outer pipe is connected to an upper connector through matching with an outer buckle, and a plurality of liquid inlet holes penetrating through the outer pipe are formed in the upper end of the outer pipe; an inner pipe is inserted into the outer pipe and is spaced from the outer pipe, and the upper end of the inner pipe is connected to the upper connector through matching with an inner buckle; a diameter expanding short section is connected to the lower end of the inner pipe so as to be suspended in theouter pipe; the inner pipe, the diameter expanding short section and the outer pipe jointly define an inner pipe annular space and an outer pipe annular space, and the inner pipe annular space and the outer pipe annular space meet the preset flow area; the flow area of the diameter expanding short section is not smaller than the flow area of an externally-connected upper pump oil pipe; a lower connector is connected to the lower end of the outer pipe through a screw thread; and the lower end of a lifting short section is connected to the upper end of the upper connector in an inserted mode, and an oil pipe section hoop is connected to the upper end of the lifting short section in a sleeving mode. The invention further provides a design method of the gas-liquid-solid separation device in the shaft. Compared with the prior art, the gas-liquid-solid separation device in the shaft is good in reliability and long in service life.

Description

technical field [0001] The invention relates to the technical field of coalbed gas well drainage equipment, in particular to a gas-liquid-solid separation device in a wellbore and a design method thereof. Background technique [0002] Various gas anchors and sand anchors are used to ensure the normal operation of the coalbed methane well drainage equipment, avoid gas locks in the gas inlet pump, and avoid sand jams. However, it is still not completely avoided that free gas enters the pump, and there are various degrees of pump air locks and oil pipe cavitation problems; solid particles enter the pump, leading to pump stuck failure, which is still the main factor leading to pump inspection, and the reliability is poor. Generally, the gas anchors used in oil wells with mechanical oil recovery are only suitable for low gas-liquid ratios, while most coalbed methane wells have gas-liquid ratios of hundreds or even thousands, so it is difficult for general gas anchors to adapt. B...

AI Technical Summary

Problems solved by technology

However, it is still not completely avoided that free gas enters the pump, and there are different degrees of pump air locks and oil pipe cavitation problems; solid particles enter the pump, leading to pump failure, which is still the main factor leading to pump inspection, and the reliability is poor

Generally, the gas anchors used in oil wells with mechanical oil recovery are only suitable for low gas-liquid ratios, while most coalbed methane wells have gas-liquid ratios of hundreds or even thousands, so it is difficult for general gas anchors to adapt

Because the viscosity of crude oil is much higher than that of water, oil production wells can carry particles of a certain size to the wellhead, while the water produced by coalbed methane is not conducive to carrying particles, so that sand anchors that can be used in oil wells are not effective in coalbed methane wells.

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