Crude oil demulsifier used at normal low temperature

Abstract

The invention relates to a crude oil demulsifier used at normal low temperature. The demulsifier includes the following components: silicone polyether having a mass percent of 10-50%, the viscosity of200-300 cSt, the HLB value of 7-10, and a closed-cup flash point of more than 60 DEG C, and a solvent including a mixture of one or more and having the mass percent of 50-90%. The silicone polyetherin composition of the crude oil demulsifier has different structures and molecular weight distribution; the crude oil demulsifier has a high efficiency oil-water demulsification effect; siloxane has low surface tension, low cohesive energy and low temperature sensitivity; demulsification can be achieved at the low temperature of 30 DEG C; the addition amount is reduced by more than 50% than that of polyether surfactant alone; and the dehydration rate is fast, the demulsification effect is good, and the comprehensive cost is reduced.

Description

technical field [0001] The invention relates to a crude oil demulsifier for normal and low temperature use, in particular to a crude oil demulsifier for gathering and transportation, and belongs to the technical field of oil field chemicals. Background technique [0002] With the increasing difficulty of oil extraction and the injection of various oil recovery additives, the water content of crude oil increases significantly after enhanced water injection and oil recovery, mostly in the form of oil-water emulsion. Crude oil production fluid contains a large amount of water, salt and other impurities, which brings great inconvenience to crude oil gathering and transportation, and must be dehydrated. Therefore, it is urgent to develop a crude oil demulsifier with strong demulsification ability and high broad-spectrum. [0003] Crude oil demulsifier refers to the separation of oil-water emulsion into water and oil through the physical and chemical action of demulsifier, so as t...

AI Technical Summary

Problems solved by technology

With the decrease of oil temperature year by year, coupled with the implementation of enhanced oil recovery measures such as water injection, acidification, profile control, etc., the structural components of crude oil emulsion are becoming more and more complex, and the dehydration of crude oil is becoming more and more difficult. crude oil from different reservoirs, so a single demulsifier cannot fully meet these needs

Northeast China, Xinjiang, Yanchang Oilfield, Changqing Oilfield and other oilfields often require crude oil production fluid to be kept at a low temperature of 30°C due to their own climate reasons, the actual situation of crude oil demulsification equipment in oil production stations, the actual demulsification temperature of produced fluid, and processing costs. Demulsification under certain conditions, most of the commercially available crude oil demulsifiers in China cannot effectively dehydrate and demulsify under this condition

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