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CN-122012057-A - Oil-in-water type wax remover and preparation method and application thereof

CN122012057ACN 122012057 ACN122012057 ACN 122012057ACN-122012057-A

Abstract

The invention provides an oil-in-water type paraffin remover, a preparation method and application thereof, and belongs to the technical field of paraffin removers. According to the invention, after the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether and the alkyl polyglycoside are compounded, a synergistic effect can be generated, so that the oil-water interfacial tension is greatly reduced, the viscosity of crude oil is effectively reduced, the fluidity is improved, the adhesion probability of wax crystals is further reduced, the mutual solvent, the alkali component, the emulsifier and the dispersing agent can promote the components to be uniformly mixed, and thus a uniform and stable oil-in-water system is formed. The results of the examples show that the wax dissolution rate of the oil-in-water type wax remover provided by the invention is more than or equal to 40mg/min at 45 ℃, and is far higher than the requirement of 0.016g/min of the wax dissolution rate in industry standard, and meanwhile, the stability time of the oil-in-water type wax remover is more than 48 hours.

Inventors

  • WANG LIJIA

Assignees

  • 杨凌尚禾植物科技产业有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The oil-in-water type wax remover is characterized by comprising, by mass, 15-50% of an organic solvent, 5-35% of a surfactant, 1-10% of a mutual solvent, 0.3-2% of an alkali component, 2-6% of an emulsifier, 0.5-10% of a dispersing agent and the balance of water; The organic solvent is vegetable oil and dimethylbenzene, and the volume ratio of the vegetable oil to the dimethylbenzene is 1 (0.5-3); The surfactant comprises sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether and alkyl polyglycoside, wherein the mass ratio of the sodium dodecyl sulfate to the fatty alcohol polyoxyethylene ether to the alkyl polyglycoside is 1 (0.1-0.2) to 0.4-0.5.
  2. 2. The oil-in-water wax remover according to claim 1, wherein the vegetable oil is palm oil or pine oil.
  3. 3. The oil-in-water wax remover according to claim 1, wherein the fatty alcohol-polyoxyethylene ether is AEO-9 and the alkyl polyglycoside is hexadecyl glucoside.
  4. 4. The oil-in-water wax remover of claim 1, wherein the mutual solvent is any one or more of ethanol, isopropanol, ethylene glycol butyl ether and diethylene glycol monobutyl ether.
  5. 5. The oil-in-water wax remover of claim 1, wherein the alkali component is sodium hydroxide or potassium hydroxide.
  6. 6. The oil-in-water wax remover according to claim 1, wherein the emulsifier is tween series or span series.
  7. 7. The oil-in-water wax remover according to claim 6, wherein the emulsifier is tween-60 or span-80.
  8. 8. The oil-in-water wax remover according to claim 1, wherein the dispersant is an ethylene oxide-propylene oxide block copolymer.
  9. 9. The method for preparing the oil-in-water wax remover according to any one of claims 1 to 8, comprising the steps of: (1) Mixing an organic solvent and a mutual solvent to obtain a mixed solvent; (2) Mixing water, a dispersing agent and an alkali component to obtain alkaline water; (3) Mixing the mixed solvent obtained in the step (1) with the alkaline water obtained in the step (2), and then adding a surfactant and an emulsifier to uniformly mix to obtain an oil-in-water type wax remover; the preparation of the step (1) and the step (2) is not sequential.
  10. 10. The use of the oil-in-water paraffin remover according to any one of claims 1 to 8 or the oil-in-water paraffin remover prepared by the preparation method according to claim 9 in oil field paraffin removal.

Description

Oil-in-water type wax remover and preparation method and application thereof Technical Field The invention relates to the technical field of paraffin removal agents, in particular to an oil-in-water paraffin removal agent, a preparation method and application thereof. Background The crude oil produced in the oil field contains a lot of waxy crude oil, the wax content reaches 15-37%, and the crude oil has the characteristics of high congealing, high viscosity, complex rheological property, poor low-temperature fluidity and the like. The waxy crude oil has good fluidity under the high-temperature and high-pressure conditions of a reservoir, but gradually reduces the temperature and the pressure along with the exploitation of the crude oil, and in the process, the wax and colloid asphaltene in the crude oil are separated out, so that the problem of wax precipitation of the oil well at different degrees is caused. The effective inner diameter of the pipe column is reduced by the wax blocking substances deposited and adsorbed on the pipe column of the oil pipe, the conveying friction resistance is increased, the oil gas yield is greatly reduced, the pipe column is blocked and stopped when the oil gas yield is serious, and the production difficulty and the exploitation risk of waxy crude oil are increased. Meanwhile, the problem of wax precipitation of waxy crude oil is accompanied with the whole gathering and transportation process, and great economic loss is caused by pump blockage accidents caused by wax precipitation each year. At present, the method for solving the problem of paraffin precipitation mainly comprises physical paraffin removal and prevention, biological paraffin removal and prevention and chemical paraffin removal and prevention. The physical paraffin removal and prevention is mainly mechanical paraffin removal, hot nitrogen well flushing, coiled tubing well flushing operation and the like, and good effects cannot be achieved. The biological paraffin removal and prevention is mainly carried out by microorganisms, however, the microorganisms need proper temperature, pressure, salinity (mineralization) and nutrient substances to survive and play roles, the activity of the microorganisms is influenced by severe changes of the oil well environment, the biological paraffin removal and prevention effect is unstable, meanwhile, the microorganisms need time to grow, propagate and metabolize the waxes, the paraffin removal and prevention effect is slow, and the removal capability of the formed hard paraffin plug is limited. The chemical paraffin removal and prevention has the advantages of quick action, thorough paraffin removal, no influence on normal production of oil wells and the like, and is widely applied. However, with deep exploitation of crude oil resources, the problem of wax blockage of high-wax-content and microcrystalline wax-containing gas resources is increasingly serious, the conventional chemical paraffin remover has low flash point (< 45 ℃) and poor low-temperature wax dissolving effect (poor room-temperature wax dissolving effect), and is poor in microcrystalline wax dissolving effect, and the conventional chemical paraffin remover has poor wax dissolving effect on high-wax-containing gas resources due to easy-corrosion elements such as sulfur, chlorine and the like, and has safety risks in the use process. Meanwhile, the paraffin remover used for chemical paraffin removal and prevention is mainly water-based paraffin remover and oil-based paraffin remover. The oil-based paraffin remover has the advantages of strong adaptability to crude oil, high paraffin melting speed, quick response after being added into an oil well, high solidifying point of products and convenient use in winter. However, oil-based wax remover has the defect of low relative density, is unsuitable for oil wells with high water content, has low ignition point, is easy to catch fire, and has potential safety hazard. The water-based paraffin remover has the advantages of high relative density, good application effect on high-water-content oil wells, safe use and no ignition hazard. But the water-based wax remover and oil have poor intersolubility, so that the water-based wax remover has slow effect when being added into an oil well. Therefore, the paraffin remover which is high in efficiency and safety and is applicable to the blockage removal of the oil wells under different complex working conditions is a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide an oil-in-water type paraffin remover, a preparation method and application thereof, and the oil-in-water type paraffin remover provided by the invention has the advantages of high paraffin dissolving speed, high paraffin removing efficiency, good stability, basically non-toxic or low-toxic materials as raw materials, high use safety and capability of removing the blockage of oil wells under different complex working