Pipeline type multistage oil-water separator utilizing angular momentum conservation

Abstract

The invention aims to provide a pipeline type multistage oil-water separator utilizing angular momentum conservation. The separator comprises a separator cylinder, the separator cylinder sequentiallycomprises a separator inlet section, a first-stage reducing section, a first-stage separation section, a second-stage reducing section and a second-stage separation section from front to back, a first-stage impeller is arranged at the separator inlet section, a second-stage impeller is arranged at the first-stage separation section, a first-stage oil guide port is formed in the separator inlet section, and a second-stage oil guide port and a third-stage oil guide port are formed in the first-stage separation section. According to the invention, by utilizing the angular momentum conservation principle, a tapered pipeline structure is adopted, the cyclone strength of the separator is enhanced, the separation efficiency is improved, the turbulence intensity in the separator is reduced throughthe unique multi-stage oil guide opening structure of the separator, excessive breaking of oil drops is avoided, and efficient separation under the wide oil content condition can be met.

Description

technical field [0001] The invention relates to an oil-water separation device, in particular to a downhole oil-water separation device. Background technique [0002] With the increasing demand for oil, the aging of oil wells is serious, and the water content in the produced fluid is as high as 90%, which puts forward higher requirements for surface water treatment equipment, and also increases the cost of oil wells. In order to solve the problem of high water content in the produced fluid, the Downhole Oil-Water Separation System (DOWS) has emerged. Pre-separation is performed downhole, the oil-rich liquid is lifted to the surface, and the water is directly injected back into the ground, thereby reducing the pressure on the surface. The burden of post-processing can improve oil well economics and extend oil well life (B.E.Bowers, and R.F.Brownlee, Development of a Downhole Oil / WaterSeparation and Reinjection System for Offshore Application, Offshore Technology Conference, H...

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Problems solved by technology

[0004] The existing liquid-liquid separation devices have certain limitations. The traditional gravity separation device has the characteristics of large volume, high cost and small processing capacity, which limits its use in places with high space requirements such as underground or remote areas. Hydrocyclone The device relies on the tangential inlet to generate a swirling flow field, resulting in turbulence in the internal flow field, high pressure drop, and large discrete particle fragmentation, which severely limits the separation efficiency.

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