Crude oil viscosity-breaking pour-point depressant composition, and preparation method and application thereof

Abstract

The invention belongs to the field of oil transportation, and particularly relates to a crude oil viscosity-breaking pour-point depressant composition, and a preparation method and application thereof. At the temperature of higher than plasticizing temperature of organic pour-point depressant, 0-3% by mass of coupling agent, 0-10% by mass of high-molecular processing assistant, and the balance ofinorganic pour-point depressant and organic pour-point depressant are melted, uniformly mixed and granulated to obtain the crude oil viscosity-breaking pour-point depressant composition. The crude oil viscosity-breaking pour-point depressant composition is uniformly dispersed in a liquid dispersion medium, and proportionally injected into crude oil, so that the crude oil can be transported. The inorganic pour-point depressant and organic pour-point depressant in the crude oil viscosity-breaking pour-point depressant composition have a synergetic effect, and can effectively lower the solidifying point and viscosity of the waxy crude oil, so that the crude oil has favorable fluidity at low temperature and favorable rheologic timeliness, thereby enhancing the crude oil transportation efficiency and safety level and lowering the transportation cost.

Description

technical field [0001] The invention belongs to the field of petroleum transportation, and in particular relates to a crude oil viscosity and pour point depressant composition composed of an inorganic pour point depressant and an organic pour point depressant, and a preparation method and application of the crude oil viscosity and pour point depressant composition. Background technique [0002] Petroleum crude oil is a multi-component complex hydrocarbon mixture containing paraffin, and also contains a certain amount of gum and asphaltenes. Paraffin wax is easy to dissolve in crude oil, and will precipitate from crude oil when the temperature drops, forming wax crystals; and as the temperature drops, the wax crystals increase to form a three-dimensional network structure, which makes the crude oil lose its fluidity and hinders oil extraction and conveyor belts. Come very difficult. my country's crude oil resources are generally high in wax content, most of which are paraffi...

AI Technical Summary

Problems solved by technology

Therefore often need pre-dispersed in inert organic solvent; For example CN 1141372C (patent No. ZL 00135876.6) discloses a kind of by ethylene-vinyl acetate copolymer, acrylate higher carbon ester-maleic anhydride-vinyl acetate copolymer, acrylic acid A liquid crude oil pour point depressant prepared in proportion to various organic polymers such as high-carbon alcohol ester polymers, epoxy resins and polyethers, and organic solvents. CN 101100599A (application number 200610090684.4) discloses a kind of organic solvent, dispersion aid , polymer pour point depressant (or further including thickener, stabilizer) compounded oil-soluble pour point depressant suspension; although they are convenient to use, due to the use of a large amount of organic solvent as the dispersion medium, the increase of The transportation cost of pour point depressant, and it may affect the oil product

More importantly, the above-mentioned technologies cannot overcome the inherent disadvantages of organic pour point depressants:

[0006] 1. After adding the pour point depressant, the temperature rise of waxy crude oil has a great influence on the rheology at low temperature, and there is a temperature rise deterioration area;

[0007] 2. The problem of shear resistance of the pour point depressant: During the long-distance transportation of crude oil, after short-term intense shearing by multiple intermediate station oil pumps and long-term medium-low speed shearing by the pipeline flow, the performance of the pour point depressant The effect decreases, leading to the increase of the freezing point and viscosity of crude oil, making it difficult to fully meet the safe operation conditions of the pipeline;

[0008] 3. After treatment with pour point depressant, the static stability of waxy crude oil is shorter, and the fluidity deteriorates after a long period of static storage;

[0009] 4. The addition of pour point depressant leads to an increase in the amount of deposition in the pipeline, increasing the conveying resistance and reducing the effective pipe diameter

[0013] 1. Clay-like substances are solid powders under normal conditions, and it is difficult to mix them evenly with liquid crude oil directly, and it is easy to leak dust and deteriorate the working environment;

[0014] 2. The viscosity and pour point reduction effect of using clay alone cannot meet the requirements of crude oil transportation;

[0015] 3. Clay-like substances and polymer pour point depressants are used in combination, and when they are added independently, it is difficult for the two to disperse evenly in crude oil;

[0016] 4. Clay substances and polymer pour point depressants are compounded and mixed in the liquid dispersion medium, but due to the different physical and chemical properties of the two, special dispersion and mixing equipment is required, and it takes a long time, which is not conducive to the on-site dispensing of oil transportation;

[0017] 5. The compounding of clay substances and polymer pour point depressants is completed by a professional factory, but the use of a large amount of dispersion medium will reduce the content of active ingredients, and at the same time increase the transportation cost of the compounding agent, and it may still require secondary injection at the oil transportation site Dispensing;

[0018] 6. In the cases described in 3-5 above, the compounding of clay substances and polymer pour point depressants is only a simple physical mixing, which cannot guarantee the hybrid synergy between clay and organic pour point depressants, and the combined use effect may not be fully utilized

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