Novel micro-bubble generator for air-flotation treatment of water extracted from oil field and analysis method thereof

Abstract

The invention discloses a novel micro-bubble generator for air-flotation treatment of water extracted from an oil field and an analysis method thereof. A body structure of the micro-bubble generator comprises a water inlet pipe, an upper cover plate, an outer wall cylinder, a lower cover plate, a core body, a spring supporting base, a compression spring and a locking nut. The center of the upper portion of the core body is provided with a reflection hole, and multiple arc-shaped distributing grooves forming a circumferential array are outward formed with the reflection hole as the center. The novel micro-bubble generator is simple in structure, is not easily blocked, can also effectively release a large number of micro-bubbles formed by dissolving associated gas in water extracted from the oil filed even under low dissolution saturability and further facilitates follow-up air-flotation purification treatment. In the analysis method, an internal flow field of the micro-bubble generator is simulated based on numerical simulation of computational fluid dynamics (CFD), the operating characteristics and the gas release effect of the novel micro-bubble generator are analyzed and predicted according to pressure drop, tubulence energy and parameters, and the technical advantages of the novel micro-bubble generator are verified through CFD numerical simulation and comparison with similar micro-bubble generators.

Description

technical field [0001] The invention relates to an air flotation treatment device for oil field produced water, in particular to a novel microbubble generator and an analysis method for oil field produced water air flotation treatment. Background technique [0002] A large amount of produced water will inevitably be produced in the process of oil extraction, especially at present, most major oil fields at home and abroad are in the middle and late stages of exploitation, and the water content in the oil well production fluid is even as high as 90%. Whether it is discharged up to the standard, or reinjected into the formation, or reused as boiler feed water, the produced water must be treated, and the removal of oil and suspended solids (SS) is the main content and goal of the treatment. [0003] Although the physical and chemical characteristics of produced water in each oilfield are different, the corresponding treatment process and supporting equipment are also slightly di...

AI Technical Summary

Problems solved by technology

The inventor claims that the physical exciter has been greatly upgraded and improved compared with the conventional dissolved air release device, and can obtain better dissolved air release effect under the condition of lower water inlet pressure and lower dissolved supersaturation, although the Oilfield field test, but so far there is no case of oilfield field engineering application

In addition, limited by the design ability and analysis method, the physical exciter has many deficiencies in the structural design: first, the internal flow channel is too simple, and the water flow hits the reflection hole through the flow channel and directly enters the steady flow area (the flow direction only changes once). The pressure reduction and energy dissipation are not thorough enough, and it is difficult to realize the complete precipitation of residual dissolved gas; secondly, in the normal working process, the size of the gap between the reflector and the cover plate is always fixed, and it is impossible to realize the gap size under different flow rates. Automatic adjustment, so that the uniform precipitation of air bubbles cannot be guaranteed, resulting in poor adaptability of the equipment

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