Adjustable steam critical flow venturi nozzle and critical flow regulation and control method

Abstract

The invention provides an adjustable steam critical flow venturi nozzle and a critical flow regulation and control method.The adjustable steam critical flow venturi nozzle comprises a critical flow venturi nozzle body, an adjusting cone, an adjusting rod, an adjusting hand wheel, a nozzle outlet and a nozzle inlet, and the nozzle outlet and the outlet of the critical flow venturi nozzle body are in the same direction; the direction of the nozzle inlet is perpendicular to the direction of the nozzle outlet, the adjusting cone is coaxial with the critical flow venturi nozzle and arranged in the critical flow venturi nozzle, and the adjusting rod is coaxially and fixedly connected with the adjusting cone and located on the upstream of the adjusting cone. The adjusting cone is driven by the adjusting rod through the adjusting hand wheel to move back and forth in the axial direction, and the adjusting cone and the critical flow venturi nozzle form a circulation channel with the variable area. According to the invention, on-line regulation and automatic control of the steam flow of each branch pipe on the ground can be realized, and the method has important significance for improving the regulation and control precision of a ground steam injection system and improving the overall oil-steam ratio of a co-injection well.

Description

technical field [0001] The invention relates to the technical field of fluid control, in particular to an adjustable steam critical flow Venturi nozzle and a method for controlling the critical flow. Background technique [0002] In the steam flooding thermal oil recovery process, one furnace is often used to inject multiple wells. The most ideal way of steam injection is that each steam injection well can be injected according to the equal dryness of the set flow rate. However, due to the parallel relationship between the branch pipelines, the branches will interfere with each other when the flow is adjusted by conventional control valves, making it difficult for each well to inject according to its own design flow. The research shows that the steam distribution effect of each branch pipe depends on the structure of the distributor, the flow pattern of each branch inlet and the resistance characteristics of each branch. Even if the distributor structure and inlet steam fl...

AI Technical Summary

Problems solved by technology

However, in this application, the quantitative relationship between the steam flow that needs to be regulated and the displacement of the regulating cone that needs to be adjusted is not given under the conditions of different inlet steam pressures, temperatures and dryness, which leads to the variation of steam flow. The adjustment is a passive adjustment. It needs to be compared with the multi-phase flow meter and repeated adjustments to achieve the design and control of the steam flow.

Images