Crude oil demulsifier for low temperature

Abstract

The invention relates to a crude oil demulsifier for the low temperature. The crude oil demulsifier is prepared from the following components: nonylphenol polyoxyethylene ether, phenolic aldehyde amine resin polyether, siloxane polyether and a solvent. The nonylphenol polyoxyethylene ether in the compositions of the crude oil demulsifier can achieve a good basic dehydration effect on conventionalcrude oil produced fluid, the phenolic aldehyde amine resin polyether is high in molecular weight and high in lipophilicity, the dissolved quantity in an oil phase is greater than the dissolved quantity in a water phase, the phenolic aldehyde amine resin polyether has the good wetting ability and the flocculation and coalescence abilities, the siloxane polyether can achieve demulsification at thelow temperature of 25-30 DEG C, compared with the mode of separately using a polyester surfactant, the additive amount is decreased by 50% or above, the dehydration rate is high, the demulsification effect is good, and the comprehensive cost is lowered.

Description

technical field [0001] The invention relates to a crude oil demulsifier for low temperature, 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 to realize the d...

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, Xinjiang, Yanchang Oilfield, Changqing Oilfield and other oilfields often require crude oil production fluid to be kept at 25-30°C due to their own climate reasons, the actual situation of crude oil demulsification devices in oil production stations, the actual demulsification temperature of produced fluid, and processing costs. Demulsification under low temperature conditions, most domestic commercially available crude oil demulsifiers cannot effectively dehydrate and demulsify under this condition

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