A non-heating secondary sedimentation dehydration system and method

Abstract

The invention belongs to the field of petroleum, and discloses a heating-free two-stage sedimentation dehydration system and method. The system comprises a upstream line, a yard upstream line, a connection line, and a charging tank, a separator, a primary sedimentation tank and a secondary sedimentation tank which are sequentially connected to the connection line in series, wherein the well site upstream line and yard upstream line are connected to the inlet end of the connection line in parallel; the bottoms of the primary sedimentation tank and secondary sedimentation tank are respectively provided with a blow-off line; the well site upstream line is also provided with a heat exchanger; and a heating coil is arranged in the secondary sedimentation tank. The system and method ensure the dehydration effect of high-water-content crude oil, and achieve the goals of energy saving and consumption reduction.

Description

technical field [0001] The invention belongs to the petroleum field, and in particular relates to a non-heating secondary sedimentation dehydration system and method. Background technique [0002] For oilfield stations, crude oil dehydration is the most important core production process of the combined station. The original dehydration process of Changqing Oilfield is to use the process of dehydrating incoming oil into the heating furnace and then entering the three-phase separator: cluster well group incoming oil (incoming oil temperature is about 3°C) mixed with the incoming oil at the pressurization point (incoming oil temperature is about 20°C), then enters the heating furnace, the mixed oil is heated to 55°C, and then enters the first chamber of the separation buffer tank, after buffering, enters the three-phase separator for Oil, gas and water separation; the separated purified oil enters the second chamber of the separation buffer tank, is pressurized, heated and mete...

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Problems solved by technology

[0004] Patent publication number: CN102836574A provides a crude oil dehydration device, because it is only a simple dehydration facility, in the specific production process in the station, in order to reach the external transportation temperature of crude oil, all crude oil still needs to enter the heating system of the station for heating ; and generally the temperature of the incoming oil from the well site is too low, which affects the dehydration effect in the settling tank

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