LP油田沉降罐过渡带原油破乳脱水实验研究

doi:10.3969/j.issn.2097-2806.2024.07.005

Abstract

Abstract:

The crude oil in the transition zone of LP oilfield settlement tank contains colloidal FeS and other components that play an emulsifying role, which makes crude oil dehydration difficult and cannot meet the requirements of crude oil inlet electrodehydrator. The physical properties, crude oil composition and produced water composition of crude oil in the transition zone were analyzed, and the screening of FeS remover and demulsifier was optimized, and the demulsification effect and adaptability of the combined FeS remover and demulsifier were studied. The results show that the screened FeS remover BLJ-01 has a good dissolution effect on FeS, and the combination of 3% FeS remover BLJ-01 and 800 mg/L demulsifier X-75 can effectively remove FeS from crude oil in the sedimentation tank transition zone at 55 ℃, with the dehydration rate of crude oil in the sedimentation tank transition zone reachings 85.78%. BLJ-01 has strong adaptability with X-75, and the dehydration rate of crude oil in the transition zone of P2 joint station settlement tank with a water content of more than 40% can reach more than 80%. It can show excellent demulsification effect under weak acid or weak alkaline conditions, which is also suitable for demulsification and dehydration of crude oil in the transition zone of SJ station settlement tank, and can significantly reduce the amount of demulsifier.

Key words: crude oil in the transition zone, demulsification, FeS, treating agent

CLC Number:

TE65

Zheng Zhang, Zhiming Tong, Chao Yang, Zhansheng Wang, Wu Chen. Experimental study on demulsification and dehydration of crude oil in the transition zone of LP oilfield sedimentation tank[J].China Surfactant Detergent & Cosmetics, 2024, 54(7): 784-794.

Figures/Tables 17

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References 24

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取样地点	族组成/%				闭合度/%	含水率/%	无机质含量/%	粘度/（Mpa·s）	含蜡/%
取样地点	饱和烃	芳烃	胶质	沥青质	闭合度/%	含水率/%	无机质含量/%	粘度/（Mpa·s）	含蜡/%
P2联合站	56.21	23.37	9.76	1.15	1 320	13.2	8.13	1 320	13.2
SJ站	62.54	24.19	10.91	1.18	98.82	未测出	0.63	46.5	22.1

取样地点	pH	ρ/ （mg/L）
取样地点	pH	S^2-	∑ Fe	可溶性SiO₂	Ca²⁺	SO₄^2-	NH₄⁺
P2联	7.2	0.133	2.5	33.23	1 708.6	6.0	160.92
SJ站	6.9	0.476	7.5	47.15	1 625.8	7.7	158.86

Experimental study on demulsification and dehydration of crude oil in the transition zone of LP oilfield sedimentation tank

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