Types and applications of crude oil demulsifiers

The demulsifier developed in our country has fully met the need of dehydration of crude oil in oil field, and the main types are summarized as follows.

1. POLYOXYETHYLENE polyoxyethylene ether, Phenol formaldehyde resin or alkyl phenolic resin

The alkyl phenol commonly used in the synthesis of initiator is nonylphenol or a mixture of alkyl phenol containing nine carbon. This kind of product can be made into oil-soluble, also can be made into water-soluble, demulsification at the same time both viscosity reduction, anti-wax role.

2. Polyvinyl polyamine polyoxyethylene polyoxyethylene propylene ether

The main amines used are ethylene polyamine, ethylenediamine and so on. This kind of product has the water solubility, the dehydration speed is fast, the low temperature resistance and so on characteristic.

3. phenolic resin polyoxyethylene polyoxyethylene ether

The starting agent was the condensation product of alkyl phenol, vinyl amine and Formaldehyde. This kind of product is suitable for low temperature dehydration, good demulsification effect, wide adaptability, with the role of viscosity reduction, Wax Prevention, is currently the main type of oil field use.

4.Four. Polyether and toluene isocyanate crosslinked to produce a polymer polyurethane

As a high molecular polyether, molecular weight is generally more than 50000. This kind of product is suitable for demulsification and dehydration of heavy oil.

5.POLYOXYETHYLENE polyoxyethylene phosphates

Polyoxyethylene ether is a product of the reaction of polyoxyethylene ether with trichlorophosphoryl (POCl3) and Tetraphosphorus decaoxide (P2O5) . The product has good dispersity in oil and water, good wettability to the interface, high demulsification speed, and is a good mixed demulsifier for crude oil.

6. AMPHOTERIC IONIC polymer

Ring-opening polymerization of the epichlorohydrin was carried out to obtain chlorinated polyethers, which were then quaternary ammonium-ated with low-molecular-weight Amines. This product not only has good demulsification effect, but also has corrosion inhibition effect, and can effectively inhibit H2S, CO2, HCl and NaCl corrosion of metal.

7. Ultra High Molecular Weight demulsifier

Epoxides were synthesized by anionic coordination polymerization in the ternary system of Triethylaluminium, acetylacetone and water. The molecular weight of epoxides was as high as 500000 to 5000000, and the demulsification effect was excellent.

8. Compound demulsifier

Through the introduction of solid anti-wax agent knowledge, using two or more demulsifiers for combination, the use of anti-wax demulsifier demulsifier demulsifier synergy can improve the performance of demulsifier, reduce the amount of demulsifier, speed up dehydration, save energy, but also make economic efficiency has been greatly enhanced. At present, this kind of demulsifier has been widely used in oil field.