Gas-liquid-solid separation device in wellbore and manufacturing method thereof

Abstract

The invention provides a gas-liquid-solid separation device in a wellbore. The upper end of the outer pipe is connected to the upper joint by being assembled with an outer buckle, and the upper end of the outer pipe is provided with a plurality of liquid inlet holes penetrating through it; The outer tube is in and spaced apart from each other, the upper end of the inner tube is connected to the upper joint by assembling with the inner buckle; the expansion joint is connected to the lower end of the inner tube to be suspended in the outer tube; the inner tube, the expansion joint and the outer tube together form an inner and outer tube. Pipe annulus, and the inner and outer pipe annulus satisfies the preset flow area; the flow area of ​​the expansion joint is not less than the flow area of ​​the external upper pump oil pipe; the lower joint is connected to the lower end of the outer pipe through a thread; The lower end of the short joint is inserted and connected to the upper end of the upper joint, and the oil pipe joint hoop is sleeved and connected to the upper end of the lifting short joint. The invention also provides a design method of the gas-liquid-solid separation device in the wellbore. Compared with the related art, the gas-liquid-solid separation device in the wellbore of the present invention has good reliability and long service life.

Description

technical field [0001] The invention relates to the technical field of coalbed methane well drainage and production equipment, in particular to a gas-liquid-solid separation device in a wellbore and a manufacturing method thereof. Background technique [0002] In order to ensure the normal operation of the coalbed methane well drainage equipment, avoid the gas lock of the gas inlet pump, and avoid sand sticking, various gas anchors and sand anchors are used. However, the free gas entering the pump is still not completely avoided, and there are different degrees of pump air lock and oil pipe cavitation problems; solid particles entering the pump, resulting in stuck pump failure, is still the main factor leading to pump inspection, and the reliability is poor. Generally, the gas anchors used in oil wells for mechanical oil recovery are only suitable for low gas-liquid ratios, while most coalbed methane wells have gas-liquid ratios of several hundreds or even thousands, and gen...

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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