Emulsion-type paraffin remover, and preparation method and application thereof

Abstract

The invention provides an emulsion-type paraffin remover, and a preparation method and application thereof. The paraffin remover is prepared from the following components in percentage by volume: 55-60% of oily solvent, 0.5-3% of surfactant and the balance of water, wherein the surfactant is sodium dodecyl benzene sulfonate and / or isosorbide dinitrate laurate. The paraffin remover is simple in formula, on the one hand, the surfactant adopted by the paraffin remover can make a system to form stable emulsion at the normal temperature, and the stable time is long; and on the other hand, when theparaffin remover is added into a formation and the temperature rises, the system can rapidly break the emulsion, and thus an organic solvent can exert a paraffin dissolving effect with the greater efficacy. The surfactant adopted by the paraffin remover can further form a layer of water film on the surface of an oil pipe, so that the effects of decreasing the depositing quantity of oil well paraffin and prolonging the paraffin removing period are achieved.

Description

technical field [0001] The invention belongs to the application field of oil field chemistry, and relates to an emulsion type wax remover and its preparation method and application. Background technique [0002] Most of my country's crude oil is waxy crude oil, with a wax content as high as 40%. Wax in crude oil usually exists in liquid form under formation conditions. The ability of crude oil to melt wax decreases, and wax precipitates from crude oil and settles around the well wall and in the production casing, causing damage to the reservoir. Wax deposition in oil wells seriously affects the normal work of oil wells, resulting in reduced production of oil wells or shutdown of oil wells. Therefore, the removal and prevention of wax in oil wells is an important technical measure to ensure the normal production of waxy crude oil. [0003] In order to solve the problem of wax deposition in oil fields, wax scrapers or hot water injection have been used for a long time to remov...

AI Technical Summary

Problems solved by technology

Oil-based wax remover has fast wax melting speed, low freezing point, strong adaptability to crude oil, and good wax removal effect. However, the commonly used oil agents are highly toxic, flammable, explosive, and easily diluted by crude oil. / T 6300 standard formulation, some solvent weighting agents have been banned

Water-based wax remover has relatively high density, is suitable for oil wells with high water content, and is not easy to catch fire, but the speed of wax removal is slow, the fluidity at low temperature is poor, and the price of the main component surfactant is high, and the concentration of use is high, so it is not easy to popularize

However, the choice of organic solvents and surfactants for emulsion-type wax removers is immature, resulting in poor stability of the emulsion, the stability time does not match the depth of wax deposition in oil wells, and the wax removal effect is poor

[0005] CN108359437A discloses an emulsion wax remover for oil wells and its preparation method and application. The emulsion wax remover includes the following components in parts by weight: 25-45 parts of diesel oil, 3-6 parts of gemini quaternary ammonium salt, fatty alcohol polyoxygen 3-7 parts of vinyl ether, 1.5-2.5 parts of sorbitan oleate, 2-5 parts of mutual solvent, 1-3 parts of sodium hydroxide, and 35-60 parts of water. The lipophilic surface is reversed to a hydrophilic surface, which is conducive to the shedding of wax, but the formula is more complicated and the cost is higher, which is not conducive to large-scale application

CN105038749A discloses an oil-in-water type wax remover, which is mixed with the following raw materials in weight percentage: 10-20% benzene, 5-15% toluene, 10-15% petroleum ether, 3-7% surfactant, 2-8% mutual solvent, 1-3% alkaline substance, 3-10% emulsifier and the rest of water, its stability is poor and it is easy to break the emulsion