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Bitumen composition particles and preparation method thereof

A technology of asphalt composition and granules, which is applied in the field of high softening point asphalt composition granules and its preparation, can solve the problems of no organic whole, difficult dispersion of water-based drilling fluid, coalescence, etc., and achieves increased deformability, Increase the use range of viscoelasticity and reduce the effect of high temperature and high pressure filter loss

Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method simply mixes rubber powder and asphalt, and the two do not form an organic whole, so it is difficult to continue to play a role in a wide viscoelastic range
It can only be used in oil-based drilling fluids. In water-based drilling fluids, it will be difficult to disperse or even coalesce.

Method used

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  • Bitumen composition particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 100 g of oxidized pitch whose softening point is 146.5° C., and heat it to a molten state. Take 75 g of waste tire rubber powder with a particle size of 100 mesh, and preheat it at 100° C. for 40 minutes. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated rubber powder particles, and stir while spraying. After spraying, it was left to stand at 135° C. for 30 minutes, and then cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -35°C, freezing time: 12 hours). After taking it out, put it into a vibrating sieve, use an 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize it for 20 seconds, and get the modified high softening point asphalt particles under the sieve. Another 80g of styrene-butadiene latex (solid content 40%) was placed in a watering can, and the latex was evenly sprayed onto the asphalt particles obtained in the above te...

Embodiment 2

[0035]Take 100g of deasphalt with a softening point of 157.2°C and heat it to a molten state. Take 46g of waste tire rubber powder with a particle size of 120 mesh, preheat at 105°C for 30 minutes, and add 7.2g of hydrotalcite. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated rubber powder particles, and stir while spraying. After spraying, it was left to stand at 155° C. for 40 minutes, and cooled to room temperature. Then place it in a freezer for freezing (freezing temperature -25°C, and freezing time for 14 hours). After taking it out, put it into a vibrating sieve, use a 100-mesh standard sieve as the bottom of the sieve, vibrate and pulverize it for 35 seconds, and get the modified high softening point asphalt particles under the sieve. Another 72g of neoprene latex (solid content 30%) was placed in a watering can, and the latex was evenly sprayed onto the asphalt particles obtained in the a...

Embodiment 3

[0037] Take 100g of natural asphalt with a softening point of 138.8°C and heat it to a molten state. Take 52 g of waste tire rubber powder with a particle size of 100 mesh, and preheat it at 95° C. for 45 minutes. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated rubber powder particles, and stir while spraying. After spraying, it was left to stand at 125° C. for 55 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -40°C, and freezing time is 10 hours). After taking it out, put it into a vibrating sieve, use an 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize it for 30 seconds, and get the modified high softening point asphalt particles under the sieve. Another 96g of nitrile latex (30% solid content) was placed in a watering can, and the latex was evenly sprayed onto the asphalt particles obtained in the above test, and stir...

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Abstract

The present invention discloses bitumen composition particles and a preparation method thereof, wherein the bitumen composition particles comprise, by weight, 80-95 parts of modified high softening point bitumen particles, and 5-20 parts of latex, wherein the modified high softening point bitumen particles comprise, by weight, 50-80 parts of high softening point bitumen and 20-50 parts of rubber powder particles. The preparation method comprises: uniformly spraying latex onto modified high softening point bitumen particles, carrying out standing penetrating for a certain time, and carrying out vacuum freeze-drying to obtain the bitumen composition particles. According to the present invention, the bitumen composition particles have characteristics of high softening point, good high-temperature performance and good deformation capacity, and can provide effects of good blocking and good filtrate reducing during the deep drilling, the preparation method is simple, and the operation is convenient.

Description

technical field [0001] The invention relates to an asphalt composition granule, in particular to a high softening point asphalt composition granule used in oil field drilling and a preparation method thereof. Background technique [0002] With the development of the petroleum industry and the continuous expansion of the drilling field, the application of bitumen-based plugging agents in oilfield drilling has attracted more and more attention. Bituminous plugging agents generally contain water-insoluble bitumen particles and have a certain softening point. When the temperature and pressure in the wellbore are high enough, the asphalt particles soften and deform, and are squeezed into the micro-fractures of the well wall, preventing drilling fluid and filtrate from penetrating through the micro-fractures, and effectively sealing the formation together with the mud cake. Bituminous substances are extremely effective anti-slump agents and oil layer protection agents for oil dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L7/02C08L9/08C08L9/04C08L11/02C08L25/06C08L9/10C09K8/24
Inventor 傅丽郭皎河姚汉荣刘树华
Owner CHINA PETROLEUM & CHEM CORP
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