A kind of waxy crude oil pouring point and viscosity reducing composite agent

A crude oil pour point depressant and compounding agent technology, which is applied in the field of pour point depressant and waxy crude oil depressant, can solve the problems of sensitivity to temperature rise of added crude oil, deterioration of temperature rise, and increased wax deposition in pipelines, etc., to achieve Long-acting aging, stable electrical insulation, and lowering of freezing point

Active Publication Date: 2018-09-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polymer-based pour point depressants have achieved remarkable economic benefits in the actual application of many domestic and foreign oil pipelines, there are still some obvious deficiencies: (1) The timeliness of its pour point and viscosity reduction effects cannot be fully achieved. It meets the requirements of long-distance transportation of crude oil pipelines; (2) Its resistance to high-speed shearing by pumps and repeated heating of pipelines is poor; (3) Added crude oil is sensitive to temperature rise, and there is a temperature rise and deterioration range; (4) There is It is reported that the addition of pour point depressant increases pipeline wax deposition; (5) the modification effect on some waxy crude oil is not ideal

Method used

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  • A kind of waxy crude oil pouring point and viscosity reducing composite agent
  • A kind of waxy crude oil pouring point and viscosity reducing composite agent
  • A kind of waxy crude oil pouring point and viscosity reducing composite agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation of surface-modified polyorganosilsesquioxane particles. 0.02 g of polymer stabilizer polyvinylpyrrolidone and 0.2 g of surfactant sodium dodecyl diphenyl ether disulfonate were completely dissolved in 25 ml of deionized water. The temperature of the system was controlled at 15-20° C., and 5 mg of 28 wt % ammonia water was added to adjust the pH of the system, and the stirring was continued. After one hour, 9.30 g of methyltrimethoxysilane was gradually added into the system, and reacted overnight at room temperature. The surfactant and other impurities are removed by centrifugation and sedimentation to obtain the polyorganosilsesquioxane particles (with a particle diameter of about 2 μm) of the present invention.

[0014] The above-prepared polyorganosilsesquioxane particles and polyoctearyl acrylate pour point depressant are directly melt-blended at 130°C at a mass ratio of 1:4 to obtain polyoctearyl acrylate / polyorganosilicon sesquioxane Oxy-alkane compo...

Embodiment 2

[0022] Example 2: The polyorganosilsesquioxane particles prepared in Example 1 and ethylene-vinyl acetate copolymer (EVA28150) were directly melt-blended at 130°C at a mass ratio of 1:9 to obtain polyvinyl acetate Vinyl ester / polyorganosilsesquioxane composite product (hereinafter referred to as composite pour point depressant). Add polyethylene vinyl acetate pour point depressant at 50 mg / kg and composite pour point depressant at 50 mg / kg to a certain waxy crude oil in China, heat each oil sample at 60°C, and use The point standard measurement method was used to determine the freezing point, and the results are shown in Table 4; the apparent viscosity at 10° C. (non-Newtonian fluid temperature) was measured using a rotational rheometer, and the results are shown in Table 5.

[0023] Table 4

[0024] Dosing situation

No additives

Add pure pour point depressant

Add compound pour point depressant

Freezing point / ℃

22

8

6

[0025] table ...

Embodiment 3

[0027] Example 3: The polyorganosilsesquioxane particles prepared in Example 1 were mixed with ethylene-vinyl acetate copolymer (EVA28150) in a mass ratio of 1:4 in 10 wt% toluene for 6 hours to obtain polyethylene - Vinyl acetate / polyorganosilsesquioxane composite product (hereinafter referred to as composite pour point depressant). At the same time, a polyethylene-vinyl acetate / 10wt% toluene system was prepared for parallel experiments. Add polyethylene vinyl acetate pour point depressant at 50 mg / kg and compound pour point depressant at 50 mg / kg to a certain waxy crude oil in China, heat each oil sample at 60°C, and use a rotary The rheometer measures its apparent viscosity at 10°C (non-Newtonian fluid temperature), and the results are shown in Table 6. At 5°C, the structural yield value at low temperature was measured by continuously increasing the shear stress with a rotational rheometer, and the results are shown in Table 7.

[0028] Table 6

[0029]

[0030] Table...

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Abstract

The invention relates to a pour-point-depressing and viscosity-reducing complexing agent for wax-bearing crude. The pour-point-depressing and viscosity-reducing complexing agent for the wax-bearing crude is used for improving the low-temperature rheological properties of the wax-bearing crude. The pour-point-depressing and viscosity-reducing complexing agent is obtained through the blending, in a fused state or a liquid state, of the following components in percentages by mass: 1 to 50 percent of polysilsesquioxane particle, 1 to 99 percent of polymer type pour-point depressant and 0 to 98 percent of organic solvent. Compared with a conventional pour-point depressant, the pour-point-depressing and viscosity-reducing complexing agent for the wax-bearing crude has better effects of depressing a pour point and reducing low temperature viscosity and a structural yield value for the wax-bearing crude, and moreover, has longer action timeliness.

Description

technical field [0001] The invention relates to a point-point and viscosity-reducing agent for waxy crude oil, especially a point-point-viscosity reducer based on spherical polyorganosilsesquioxane particles and traditional polymers, which is used to improve the low-temperature rheological properties of waxy crude oil and belongs to Petroleum pipeline transportation technology field. Background technique [0002] my country's waxy crude oil reserves are very rich, accounting for more than 80% of the country's total crude oil production. The crude oil produced by several major domestic oil fields such as Daqing, Changqing, and Shengli are all high waxy crude oils. The most important characteristic of this kind of crude oil is that as the temperature of crude oil decreases, the wax itself dissolved in the liquid oil begins to nucleate and precipitate and grow up gradually. Another important component in the wax) content and properties, cooling rate and many other factors are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/17C09K3/00
CPCC09K3/00F17D1/17
Inventor 杨飞李传宪姚博孙广宇史鑫陈亚群杨爽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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