Ejector device with adjustable nozzle cross-sectional area

Abstract

The invention provides an ejector device with an adjustable nozzle cross-sectional area. The ejector device comprises an ejector shell, wherein a drainage channel formed by a liquid inlet section, a variable cross-sectional area nozzle, a receiving chamber, a mixing chamber and a diffusion chamber which are sequentially connected is arranged in the ejector shell; a gas inlet section communicatingwith the receiving chamber is arranged on the ejector shell; the variable cross-sectional area nozzle comprises an annular nozzle shell I, an annular nozzle shell II, a gear ring and adjusting valves;the gear ring is arranged between the nozzle shell I and the nozzle shell II; the adjusting valves are arranged on the nozzle shell II; a plurality of adjusting valves are sequentially embedded in anend-to-end manner to form an annular structure; the annular structure is positioned in the drainage channel; each adjusting valve is fixedly connected with a linkage rod piece; the adjusting valves are connected with the gear ring through the linkage rod pieces; an adjusting knob is arranged outside the ejector shell; and the adjusting knob is connected with gear teeth of the gear ring through atoothed bar. According to the ejector device disclosed by the invention, the nozzle aperture of the ejector can be changed, so that the ejector can efficiently recover casing gas under different working conditions.

Description

technical field [0001] The invention relates to an ejector device, in particular to an ejector device with adjustable nozzle sectional area. Background technique [0002] In the field of oil and gas well development, there are many processes involving the transition of wellhead pressure from low pressure to high pressure and then to low pressure. Low-pressure gas wells cannot be effectively exported because the wellhead pressure is too low, and special equipment and a large amount of energy are required to meet the requirements of the production process; while high-pressure gas wells need to be throttled and depressurized before they can enter the export pipeline to avoid excessive pressure causing damage to the suction port of the oil pump. In actual production, the method of periodically releasing casing gas is generally used to reduce the wellhead pressure. This practice causes resource waste and environmental pollution. How to recover this part of the vented casing gas...

AI Technical Summary

Problems solved by technology

The geometric structure of the traditional ejector is fixed, and the cross-sectional area of ​​the nozzle has been determined at the beginning of the design, so the parameters of the outlet flow of the ejector cannot be adjusted

Under the designed working conditions, this type of ejector can achieve the highest working efficiency, but when the working conditions change, the working efficiency of the ejector will decrease, or even fail to work normally

Images