Separation method and device for oilfield complex drive produced liquid

Abstract

The invention discloses a separation method and device for oilfield complex drive produced liquid, and mainly aims to solve the problems that a single cyclone separator is incomplete in separation and the separate sedimentation separation takes too much time. The separation method is characterized by comprising the following steps: a mixed medium produced by oilfield complex drive is firstly sent to a single cyclone or a cyclone group for high-speed centrifugal separation; the media with different densities after centrifugal separation are respectively sent to different positions in a settling tank through different pipelines; the low-density medium is introduced to an upper position in the settling tank through an upper pipeline; the middle-density medium is introduced into the middle position of the settling tank through the middle pipeline; the high-density medium is introduced into the lower position of the settling tank through the lower pipeline; an upper baffle plate, a middle baffle plate and a lower baffle plate are arranged near outlets of the corresponding upper pipeline, middle pipeline and lower pipeline in the settling tank, so that the flow velocity and flow direction of the media suddenly change to ensure that the fluid is sufficient to buffer; the cyclone group is connected with several cyclones in parallel as required, so that the media with the same density separated by the cyclones connected in parallel are output by the same output pipeline.

Description

technical field [0001] The invention relates to a multi-phase medium separation technology and device applicable to the fields of petroleum, chemical industry, ocean engineering, water treatment, environmental protection, etc., and is especially suitable for separating and treating oilfield compound flooding production fluid. Background technique [0002] At present, many oilfields in my country have entered the stage of secondary oil recovery and tertiary oil recovery with high water cut and high recovery degree. Polymer flooding oil recovery, binary compound flooding oil recovery, ASP compound flooding oil recovery, SAGD oil recovery, etc. have become extremely important and important in my country at this stage. The technology of enhancing oil recovery is widely used. Therefore, problems such as increased viscosity of produced fluid, serious emulsification of crude oil, small particle size of oil beads, and increasing sand content and associated gas volume have come one aft...

AI Technical Summary

Problems solved by technology

Cyclone separation uses the density difference between incompatible media for centrifugal separation. Cyclone separation has the advantages of simple structure, high separation efficiency, small equipment footprint, convenient and flexible use, etc. Cyclone as a separation equipment It has been widely used in many industries at home and abroad and its development is becoming more and more mature. However, cyclone separation is still incomplete separation. The internal flow field of the cyclone is extremely complex and has high requirements on the inlet flow, pressure and other operating conditions in practical applications.

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