Inclined tube h-type underwater crude oil online separation method

Abstract

The invention provides an inclined pipe type H-shaped on-line separation method for underwater crude oil. The method is applied to underwater crude oil on-line separation. A separation system organically combines vertical type and horizontal type on-line separation of the crude oil with a high-voltage electric field rapid dehydration process and a control system thereof, and according to two-stage series, inclined pipe type structure and H-shaped arrangement, two-stage rapid separation of the underwater crude oil is achieved. A first-stage pipe type separator conducts the first stage of inclined pipe type oil-gas-water pre-separation process, and wet gas and most of water are separated out. A second-stage pipe type electric dehydrator adopts an array type high voltage bare electrode and inclined split type thick wall pipe body and conducts the second stage of array type high voltage electric field crude oil deep dehydration process, and residual water is separated out. A gas-liquid separator removes condensate oil small oil drops in the wet gas according to the two-stage filter liquid effect. A mixer fully stirs the water-contained crude oil and chemical agents through a mixer wheel to form crude oil emulsion. Remote automatic control over all stages of underwater on-line separation operation is achieved and safe flowing of the operation is guaranteed through an underwater on-line control system.

Description

technical field [0001] The invention relates to an online crude oil separation method of an underwater production system in the field of marine engineering, in particular to an inclined tube type H-type underwater crude oil online separation method and a process flow thereof. Background technique [0002] At present, the typical multi-stage crude oil separation process flow of offshore platforms and onshore oil and gas fields at home and abroad usually includes "first stage heater → three-phase separator → secondary heater → thermochemical separator → electric desorption booster pump → electric deheating device → electric dehydrator". The three-phase separator and the thermochemical separator mainly use the gravitational sedimentation of chemical agents and water particles to separate the three phases of oil, gas and water, while the electric dehydrator uses the electric field to demulsify the crude oil and continue to separate and settle the water particles in the oil. The...

AI Technical Summary

Problems solved by technology

Compared with conventional vertical and horizontal crude oil processing processes on offshore platforms, the underwater crude oil online separation system includes a first-stage tubular separator and a second-stage tubular electric dehydrator, and both separators adopt two-stage tubular The form of series connection realizes the rapid and deep separation of crude oil; moreover, the two-stage separator adopts the inclined tube structure, which organically combines the vertical and horizontal online separation technology of crude oil, which solves the problem of small oil-water interface coverage area and separation time of conventional separators. At the same time, the two-stage pipe separators are arranged up and down respectively, and the middle part is kept connected through the flow mixer, so that the whole separation system presents an H-shaped layout mode as a whole

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