Application research of electric field enhanced oil-water separation in oilfield produced liquid

doi:10.19965/j.cnki.iwt.2021-0660

Abstract

Abstract:

At present，the process of “three-phase separation+electric dehydration”is adopted in the treatment of high water-cut produced fluid in offshore oilfields，which has a long process flow and a large area. In order to deal with the produced fluid with high water content more efficiently，a new type of electric field-enhanced oil?water separator was designed，and a skid-mounted device with a processing capacity of 10 m³/h was manufactured. The influence of frequency，demulsifier，etc. on the separation effect of the electric field-enhanced oil?water separator was studied through field experiments. The results showed that for the platform crude oil incoming liquid with high water content（water content of 78%?97%），when the inlet flow rate，the power supply voltage of the electrostatic coalescer and the power supply frequency was controlled to 10 m³/h， 4.98 kV and 3 500 Hz，the water content of the oil phase outlet was as low as 7%. In this case，the demulsifier could be omitted，which saved the cost of medicine.

Key words: electrostatic coalescence, three-phase separator, dehydration, demulsification

摘要：

目前海上油田处理高含水采出液采用的是“三相分离+电脱水”工艺，工艺流程较长，占地面积大。为了更高效地处理高含水采出液，设计了新型电场强化油水分离器，并制造了处理能力为10 m³/h的撬装装置。通过矿场试验研究了频率、破乳剂等对电场强化油水分离器分离效果的影响，结果表明，针对平台高含水（含水率78%~97%）原油来液，当控制入口流量为10 m³/h，静电聚结器电源电压为4.98 kV，电源频率为3 500 Hz时，油相出口含水低至7%，可以不加破乳剂，节约了药剂成本。

关键词: 静电聚结, 三相分离器, 脱水, 破乳

CLC Number:

TE868

Xiaoxu TANG,Yong ZHANG,Xiujun WANG,Jiaqing CHEN. Application research of electric field enhanced oil-water separation in oilfield produced liquid[J]. Industrial Water Treatment, 2022, 42(3): 168-171.

唐晓旭,张勇,王秀军,陈家庆. 电场强化油水分离技术在油田采出液中的应用研究[J]. 工业水处理, 2022, 42(3): 168-171.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0660

https://www.iwt.cn/EN/Y2022/V42/I3/168

Figures/Tables 5

Fig. 1 Illustration of Water-droplet dipolar coalescence

Fig. 2 Schematic of vessel internal electrostatic coalescers（VIEC）

Fig. 3 Effect of power frequency on separation efficiency

Fig. 4 Effect of electric field on separation efficiency

Fig. 5 Effect of demulsifier types and their dosage on separation efficiency

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