A kind of modified asphalt composition particle and its preparation method

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 problems such as coalescence, failure to form an organic whole, and difficulty in dispersing water-based drilling fluids, so as to improve high temperature resistance, Increase the deformability, improve the effect of high temperature and high pressure filtration loss

Active Publication Date: 2017-11-24
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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  • A kind of modified asphalt composition particle and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Take 100 g of oxidized pitch whose softening point is 146.5° C., and heat it to a molten state. Take 75g of styrene-butadiene rubber powder, preheat at 100°C for 40 minutes, add 7.2g of hydrotalcite, put the melted high softening point asphalt in the watering can, and spray the high softening point asphalt evenly on the preheated particles On, turning 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, and add 6.2g of cetyltrimethylammonium chloride. Use an 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 20 seconds, and get the modified high softening point asphalt composition particles under the sieve.

Embodiment 2

[0042] Take 100g of deasphalt with a softening point of 157.2°C and heat it to a molten state. Take 46g of butyl rubber powder, preheat at 105°C for 30 minutes, add 6.0g of hydrotalcite, put the melted high softening point asphalt in a watering can, and evenly spray the high softening point asphalt on the preheated rubber On the powder particles, turn 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, and add 7.3g of sodium lignosulfonate. Use a 100-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 35 seconds, and get the modified high softening point asphalt composition particles under the sieve.

Embodiment 3

[0044] Take 100g of natural asphalt with a softening point of 138.8°C and heat it to a molten state. Take 52g of neoprene rubber powder, preheat at 95°C for 45 minutes, add 8.4g of hydrotalcite, put the melted high softening point asphalt in a watering can, and evenly spray the high softening point asphalt on the preheated rubber On the powder particles, turn 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). Put it into a vibrating sieve after taking it out, and add 9.2g of secondary alcohol sodium sulfate. Use 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 30 seconds, and get the modified high softening point asphalt composition particles under the sieve.

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Abstract

The invention discloses a modified asphalt composition granule and a preparation method thereof, which comprises the following components in parts by weight of the asphalt composition granule: 50-80 parts by weight of high softening point asphalt, and 20-50 parts by weight of rubber powder particles. The preparation method includes the following steps: heating high-softening-point asphalt to a molten state, uniformly spraying it on rubber powder particles, standing for a period of infiltration, and vibrating and pulverizing in a vibrating sieve after freezing to obtain asphalt composition particles. The asphalt composition particles of the invention have higher softening point, better high-temperature performance and deformability, simple preparation method and convenient operation, and can have good plugging and fluid loss reduction effects in deep drilling.

Description

technical field [0001] The invention relates to a modified asphalt composition granule, in particular to a high softening point asphalt composition granule used in oil field drilling and its preparation method and application. 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 the drilling fluid 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 fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L23/22C08L9/02C08L11/00C08L9/06C08L97/00C08K13/02C08K3/26C08K5/19C08K5/41C09K8/035
Inventor 傅丽郭皎河姚汉荣李志军张建峰
Owner CHINA PETROLEUM & CHEM CORP
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