Underground two-stage cyclone separator

Abstract

The invention provides an underground two-stage cyclone separator, which comprises an outer pipe, a first-stage cyclone separator, a second-stage cyclone separator and a rich oil flow channel, wherein the outer pipe is provided with a produced fluid inlet; the first-stage cyclone separator is arranged in the outer pipe, and comprises a first pipe wall and a first inner cavity in the first pipe wall; a first inlet, a first rich oil overflow channel and a first rich water drainage channel are formed in the first inner cavity; the second-stage cyclone separator is arranged in the outer pipe, and comprises a second pipe wall and a second inner cavity in the second pipe wall; a second inlet, a second rich oil overflow channel and a second rich water drainage channel are formed in the second inner cavity; the rich oil flow channel is arranged in the outer pipe, and is connected with the first rich oil overflow channel and the second rich oil overflow channel; the first-stage cyclone separator is connected in series with the second-stage cyclone separator; the first inlet is communicated with the produced fluid inlet; and the first rich water drainage channel is connected with the second inlet.

Description

technical field [0001] The invention relates to the fields of petrochemical industry and environmental protection, and belongs to liquid-liquid two-phase separation treatment technology. Specifically, it relates to a downhole secondary cyclone separator for downhole oil-water separation. Background technique [0002] At present, the rapid separation methods used for liquid-liquid two-phase (taking oil-water two-phase as an example) mainly include cyclone separation, air flotation, filtration and membrane separation. Air flotation is suitable for a small range of changes in oil concentration; filtration can better achieve the separation of oil and water, but for high oily sewage, frequent backwashing is required to ensure long-term stable operation of the equipment; the cost of membrane separation equipment is relatively high, The requirements for medium conditions are more stringent. Cyclone separation has the advantages of small equipment size and high separation efficienc...

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Problems solved by technology

[0005] The present invention aims to provide a downhole secondary cyclone separator to solve the problem of poor effect of downhole oil-water separation in the prior art

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