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Crude oil viscosity-reducing and depressant composite

A composition and crude oil technology, applied in drilling compositions, silicon compounds, inorganic chemistry and other directions, can solve the problem that the temperature rise of waxy crude oil has a great influence on low temperature rheology, it is difficult to fully meet the safe operation conditions of pipelines, and the waxy crude oil The problem of static stability, short aging, etc., achieves excellent aging, good pour point and viscosity reduction and drag reduction, and the effect of improving low temperature fluidity.

Active Publication Date: 2011-06-29
PIPECHINA SOUTH CHINA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 being treated 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
However, so far, there is no report on the use of clay as a pour point depressant for crude oil.

Method used

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  • Crude oil viscosity-reducing and depressant composite

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1. Commercially available bentonite, particle size 325 mesh, particle diameter ≤ 45 μm. Its active ingredient is sodium-based montmorillonite with a content of 90%. The viscosity and pour point depressing composition composed of sodium montmorillonite and ethylene-vinyl acetate copolymer pour point depressant is added to waxy crude oil in the following manner: first, 50 ppm by weight of sodium montmorillonite and 50 ppm by weight of ethylene- The crude oil viscosity and pour point depressant composition of vinyl acetate copolymer pour point depressant is dispersed in diesel oil at a concentration of 1 wt%, and then added to waxy crude oil, and the temperature is controlled at about 64°C; mechanically stirred at a speed of 10,000 rpm to reduce the viscosity of crude oil The pour point depressing composition is uniformly dispersed in the crude oil, stirred for 5 minutes and then cooled. Store at 25°C. The viscosities of the crude oil added with the crude oil ...

Embodiment 2

[0034] Embodiment 2. Preparation of organic montmorillonite: stirring 100 g of raw material sodium montmorillonite in 500 ml of deionized water dispersion medium to form suspension dispersion A; then treating agent dioctadecyl dimethyl ammonium chloride 70g was added to the suspension A, and the mixture was stirred and reacted at 80-90°C for 4.5 hours and then filtered; the filtrate was washed several times with deionized water until no halide ions existed in the washing liquid. The filtrate is dried and pulverized to obtain an organic clay with a particle size of 20-30 μm and a modified component of dioctadecyldimethylammonium cation.

[0035] The organoclay modified by dioctadecyldimethylammonium cation is added in the waxy crude oil in the following way: first, the organoclay modified by 50 ppm by weight of dioctadecyldimethylammonium cation is directly added to the organoclay containing In the waxy crude oil, control the temperature at about 55°C; mechanically stir at a sp...

Embodiment 3

[0037] Example 3. Preparation of organic montmorillonite: 100 g of raw material sodium montmorillonite was stirred in 500 ml of deionized water dispersion medium to form suspension dispersion A; then 60 g of treatment agent dihydrogenated tallow dimethyl ammonium was added In suspension A, the mixture was stirred and reacted at 80-90°C for 4.5 hours and then filtered; the filtrate was washed several times with deionized water until no halogen ions existed in the washing liquid. The filtrate is dried and pulverized to obtain an organic clay with a particle size of 20-30 μm and a modified component of double hydrogenated tallow dimethyl ammonium cation.

[0038] The organic clay modified by double hydrogenated tallow dimethyl ammonium cation is added in the waxy crude oil in the following way: first the organic clay modified by double hydrogenated tallow dimethyl ammonium cation with 10wt% Disperse the concentration of the organic clay in xylene, then add it to the waxy crude oi...

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Abstract

The invention provides a crude oil viscosity-reducing and depressant composite and relates to the technical fields of organic chemistry, petroleum industry and pipe system. The composite consists of clay, organic depressant and dispersion medium, wherein the weight ratio of clay to organic depressant is 1:0-1:5; dispersion medium accounts for 1%-99% of the total weight; clay contains montmorillonite, hectorite, nontronite or saponite and is unmodified inorganic clay or organic clay after organic modification. The organic clay is the organic clay obtained through organic cationic modification or the organic clay obtained through organic cationic modification and silane coupling agent treatment; and the organic depressant is common organic depressant. After the crude oil viscosity-reducing and depressant composite is used, the viscosity of crude oil is reduced, the viscosity tends to be reduced in the shearing field and crude oil has good low temperature liquidity and ageing.

Description

technical field [0001] The invention relates to a crude oil viscosity and pour point reducing composition, which relates to the technical fields of organic chemistry, petroleum industry and pipeline system. Background technique [0002] 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. With the continuous increase of crude oil production and transportation, the proportion of low-wax crude oil decreased, while the proportion of high-wax crude oil increased. This type of crude oil is characterized by high freezing point, high apparent viscosity a...

Claims

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Application Information

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IPC IPC(8): C09K8/58F15D1/02
CPCC08K3/346C01B33/44C09K8/58C08L23/02
Inventor 张冬敏阳明书张立新丁艳芬姜保良王峰李莉张世民胡森苗青支树洁霍连峰
Owner PIPECHINA SOUTH CHINA CO
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