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Asphalt composition particle 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, which can solve the problems of reduced effective components of asphalt powder, limited deformation capacity of granules, and damage to mud system, so as to reduce high-temperature and high-pressure filtration loss , increase the deformability, improve the effect of compactness

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will reduce the effective components in the asphalt powder, and due to the introduction of other components, it may cause damage to the mud system during use.
[0007] In addition, when the existing high softening point asphalt particles are used in the drilling fluid system, due to the narrow or unlimited particle size distribution, and the deformation ability of each particle size is limited, when there is a wide pore size distribution in oil and gas reservoirs, It cannot be well matched with it, and it is difficult to achieve a good plugging and filtration loss reduction effect

Method used

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  • Asphalt composition particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 200g of high softening point asphalt with a softening point of 153°C, add 3.5% hexadecyltrimethylammonium chloride, freeze at -5°C for 3 hours, pulverize in a small universal grinder for 15 seconds, and use the obtained asphalt powder with 60 Mesh and 80 mesh standard sieves are used to obtain 60-80 mesh high softening point asphalt granules. Take 85g of styrene-butadiene latex (40% solid content) in a watering can, spray the latex evenly on the asphalt particles obtained in the above test, and stir while spraying. After spraying, let it stand at room temperature for 30 minutes, and perform vacuum freeze-drying (pre-freezing temperature is -40°C, pre-freezing time is 2 hours, drying temperature is -20°C, drying time is 10 hours) to obtain asphalt composition particles.

Embodiment 2

[0033] Take 200 g of high softening point asphalt with a softening point of 172.8°C, freeze it at -10°C for 4.5 hours, and pulverize it in a small universal grinder for 20 seconds. The asphalt powder obtained is sieved with 80-mesh and 100-mesh standard sieves to obtain 80-100-mesh high softening point asphalt. Take 96g of neoprene latex (solid content 30%) and put it in a watering can, spray the latex evenly on the asphalt particles obtained in the above test, and stir while spraying. After spraying, let stand at room temperature for 45 minutes. Add 5.0% sodium lignosulfonate, mix well, and carry out vacuum freeze-drying (prefreezing temperature -30°C, prefreezing time 2.5 hours; drying temperature -18°C, drying time 12 hours) to obtain asphalt composition granules.

Embodiment 3

[0035]Take 200g of high softening point asphalt with a softening point of 146.6°C, add 6.0% sodium secondary alcohol sulfate, freeze at -25°C for 5.5 hours, pulverize in a small universal pulverizer for 30 seconds, and use 100 mesh and 120 mesh standard Sieve to obtain 100-120 mesh high softening point asphalt. Take 128g of nitrile latex (solid content 30%) and place it in a watering can, spray the latex evenly on the asphalt particles obtained in the above test, and stir while spraying. After spraying, let stand at room temperature for 60 minutes. Vacuum freeze drying (prefreezing temperature -35°C, prefreezing time 3 hours; drying temperature -25°C, drying time 15 hours) to obtain asphalt composition particles.

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Abstract

The invention discloses an asphalt composition particle and a preparation method thereof. The asphalt composition particle comprises the following components in percentage by weight: 80-95% of high-softening-point asphalt particles and 5-20% of latex. The preparation method of the asphalt composition particle comprises the following steps: the latex is uniformly sprayed onto the high-softening-point asphalt particles, the high-softening-point asphalt particles stand still for a period of time so that the latex can permeate, and then are subjected to vacuum freezing drying, and the asphalt composition particles are obtained. The asphalt composition particles have high softening point, good high-temperature performance, simple preparation method, convenience for operation and good blocking and de-filtration effects during deep drilling.

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 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 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 f...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L9/08C08L11/02C08L9/04C08L9/10C08L25/06C08L97/00C08K5/19C08K5/41C08J3/12C08J3/00C09K8/035
Inventor 傅丽郭皎河姚汉荣刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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