Down-hole eccentric gas separator

Abstract

The invention discloses a down-hole eccentric gas separator. The down-hole eccentric gas separator comprises an external pipe, an eccentric connector and a connecting base, wherein the eccentric connector and the connecting base are connected with the upper end and the lower end of the external pipe respectively, one end of an internal pipe is communicated with the eccentric connector, the other end of the internal pipe is communicated with the external pipe, the axis of the internal pipe and the axis of the external pipe are arranged in parallel, an eccentric annular space is formed between the internal pipe and the external pipe, a plurality of gas exhaust holes and a plurality of liquid inlet holes are formed in the two sides of the external pipe respectively, the gas exhaust holes are formed in the wide side of the eccentric annular space, and the liquid inlet holes are formed in the narrow side of the eccentric annular space. The axis of the internal pipe and the axis of the external pipe are not arranged on the same straight line, when a gas and liquid mixture which is processed through secondary separation enters the external pipe through the liquid inlet holes, the gas and liquid mixture will be separated again on the two eccentric flow passes between a sleeve and the external pipe, in other words, simple separation between gas and liquid is repeatedly carried out while the gas and liquid mixture naturally slides down due to its gravity, the content of gas in the liquid which finally enters the internal pipe is further reduced, and the pump efficiency of an oil pump is improved.

Description

technical field [0001] The invention relates to a downhole pipe string, in particular to a downhole eccentric gas separator. Background technique [0002] When the pumping well is in production, the fluid entering the wellbore is generally two tanks of gas and oil or a three-phase mixture of gas, oil and water. Due to the existence of the gas phase, when the pressure at the suction inlet of the pump is lower than the bubble point pressure, the gas will exist in the form of small bubbles. During the pumping process, due to the strong compressibility of the gas, the gas becomes the main factor affecting the pump efficiency of the rod pump. In order to reduce the influence of gas on the work of the oil well pump, two methods are generally adopted: one is to increase the submergence of the pump to increase the inlet pressure of the pump to reduce the influence of free gas on the work of the pump; the other is to use a downhole gas separator to make the pump Before the fluid ent...

AI Technical Summary

Problems solved by technology

Although this structure utilizes the gas-liquid slippage effect, since the oil-gas mixture is separated in the outer tube, the outer tube is limited by space and the pressure is high when the flow rate of the oil-gas mixture remains unchanged, so the separation effect is poor and the separation efficiency is poor. lower

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