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Electrostatic Coalescer

The traditional three-stage oil-water separation process generally includes: first-stage separation (physical separation: oil, gas, water); second-stage separation (physical separation: oil, gas, water); third-stage (electric field separation: almost no gas), etc. Multistage dehydration.

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Overview

The traditional three-stage oil-water separation process generally includes: first-stage separation (physical separation: oil, gas, water); second-stage separation (physical separation: oil, gas, water); third-stage (electric field separation: almost no gas), etc. Multistage dehydration.

In response to the above situation, in October 2010, Luoyang Zhengyuan Petrochemical Company and CNOOC Research Institute proposed to carry out research on electrostatic coalescence technology to improve the efficiency of oil-water separation, which can be used for dehydration of offshore platforms and FPSO tankers to save investment and increase production and efficiency.

On this basis, with the assistance of Sinopec Luoyang Engineering Company, the electrostatic coalescence separation technology with the world’s advanced technical level is developed.

The technology has been industrially applied in Liuhua FPSO tanker, Lufeng 13-1 platform, Bozhong 34-1 platform, Chengbei CB-BSL platform, Nanhai Shengli FPSO tanker, Weizhou 12-1 PUQB platform, and achieved electrostatic coalescence separation. Technical research and application goals to meet the requirements of industrial applications.

Features
  • 1Using insulated electrodes, no direct contact with crude oil
  • 2No short circuit and tripping
  • 3High-voltage electrodes can handle crude oil with high water content
  • 4The output electrostatic field voltage is stable
  • 5low dehydration temperature
  • 6Small current, low energy consumption, small footprint, low investment
  • 7High dehydration efficiency, fast speed, to achieve multi-stage dehydration effect
Effect Table

Electrostatic coalescence dehydration effect in the case of medium and high water content (Bozhong 34-1 platform application)

serial number Inlet amount oil flow water flow Voltage current temperature pressure feed water Oil contains water water with oil dwell time
m3/h m3/h m3/h KV A MPa % % mg/l min
1 36.1 24.0 9.1 5 4.0 58 0.38 40.0 0.4 123 18.4
2 27.4 17.8 9.6 5 4.0 58 0.38 50.0 1 299 24.3
3 33.9 22.4 11.5 8 7.0 58 0.38 50.0 0.8 168 19.6
4 33.0 25.2 7.8 10 8.0 59 0.38 50.0 0.8 300 20.1
5 30.2 18.5 11.9 10 9.0 59 0.38 60.0 0.9 360 22.0
Achievement Table

Application performance table of electrostatic coalescence technology in CNOOC

serial number user name project name date
1 CNOOC Shenzhen Branch Liuhua Phase II FPSO static coalescence dehydrator renovation project 2012
2 CNOOC Shenzhen Branch Lufeng 13-1 platform multi-functional oil-water separator renovation project 2013
3 CNOOC Tianjin Branch Bozhong 34-1 Platform Electrostatic Coalescing Dehydrator Reconstruction Project 2013
4 CNOOC Zhanjiang Branch The B tank of electrostatic coalesce was used in Weizhou production area of Zhanjiang with two stage separator 2018
5 CNOOC Tianjin Branch Pengbo FPSO low pressure separator to change electrostatic coalescence 2020
6 CNOOC Tianjin Branch Lvda Phase 52 electrostatic coalescence 2021
7 CNOOC Zhanjiang Branch Static coalesce tank A was used in Weizhou production area of Zhanjiang with two stage separator 2022
Patent

State-of-the-art electrostatic coalescence dehydration technology

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