Asphalt composition used for drilling fluid and preparation method thereof

A kind of asphalt composition and drilling fluid technology, applied in the field of oil drilling, to achieve the effect of high brittleness, quality improvement and tight combination

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

This additive composition can be effective in a wide range of temperature and pressure, but simple mechanical mixing is difficult to effectively play the role of asphalt with different softening points

Method used

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  • Asphalt composition used for drilling fluid and preparation method thereof
  • Asphalt composition used for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 2g of potassium permanganate to 350g of molten coal tar pitch (softening point: 60°C) and mix evenly, then transfer it to an oxidation kettle for blowing oxidation. Spot the surface of asphalt powder (softening point is 150°C, average particle size is 70 μm), and then cool to room temperature to obtain asphalt composition. The oxidation conditions and product properties are shown in Table 1.

[0027] Add 100g of low-temperature embrittled asphalt composition (low-temperature embrittlement conditions: temperature -25°C, time 8 hours), 16g of graphite and 4g of bentonite into a high-speed pulverizer, mixing time of 5s, pulverization time of 25s, adding 1.5g The water-soluble acrylic resin was mixed for another 4 seconds to obtain asphalt composition particles, denoted as A1, with an average particle size of 100 μm.

Embodiment 2

[0029] Mix 5g of graphite and 5g of bentonite evenly, add to 300g of molten coal tar pitch (softening point is 70°C), mix evenly, then transfer to the oxidation kettle for blowing oxidation, after the reaction is over, spray the oxide material while it is hot to the surface of 100g of high softening point asphalt powder (softening point is 185°C, average particle size is 50μm), and then cooled to room temperature to obtain asphalt composition, oxidation conditions and product properties are shown in Table 1.

[0030]Add 100g of low-temperature embrittled asphalt composition (low-temperature embrittlement conditions: temperature -10°C, time 5 hours), 5g graphite and 5g bentonite into a high-speed pulverizer, mixing time 5s, crushing time 20s, add 2g of The water-soluble acrylic resin was mixed for another 4 seconds to obtain asphalt composition particles, denoted as A2, with an average particle size of 80 μm.

Embodiment 3

[0032] 150g of molten coal tar pitch (softening point: 90°C) was added to the oxidation kettle for air blowing oxidation. After the reaction, the oxide material was sprayed onto the surface of 100g of high softening point asphalt powder (softening point: 200°C, average particle size diameter of 30 μm), and then cooled to room temperature to obtain a bituminous composition, the oxidation conditions and product properties are shown in Table 1.

[0033] 100g of asphalt composition, 3g of graphite, 6g of montmorillonite and 0.5g of cetyltrimethylammonium bromide were added to the high-speed pulverizer, the mixing time was 5s, and the pulverization time was 30s to obtain the asphalt composition particles, denoted as A3, its average particle size is 50 μm.

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Abstract

The invention discloses an asphalt composition used for a drilling fluid and a preparation method thereof. The asphalt composition takes high softening point asphalt as the nucleation phase, and high softening point asphalt is covered with high-softening-point coal asphalt. The asphalt composition comprises the following components in percentage by mass: 20-50% of high-softening-point asphalt and 50-80% of high-softening-point coal asphalt, wherein the softening point difference of high softening point asphalt and high softening point coal asphalt is 15-40 DEG C. The preparation method comprises the following steps: adding molten coal asphalt into an oxidation reactor; introducing air for performing air blowing oxidation reaction; after the reaction is ended, spraying the oxidized material on the surface of high-softening-point asphalt powder for covering; cooling to obtain the asphalt composition; adding the asphalt composition into a smashing device for mixing and smashing to prepare asphalt composition particles. The asphalt composition has a relatively high softening point, and can continuously play a role under the drilling operation conditions within a relatively wide temperature range.

Description

Technical field [0001] The present invention belongs to the field of petroleum drilling technology, which involves a asphalt composition and preparation method for drilling fluid. Background technique [0002] Asphalt products are one of the important drilling liquid treatment agents, and have comprehensive effectiveness such as anti -collapse, lubrication, emulsification, filtration loss and high temperature and stability.Asphalt products generally contain asphalt particles that are insoluble in water, and have a certain softening point.When there is sufficient temperature and pressure in the well, asphalt particles soften and deform, and are squeezed into the micro -cracks of the well wall, preventing the drilling fluid and filter fluid from penetrating from micro -cracks, and effectively blocking the stratum with the clay cake.Asphalt -type substances are extremely effective anti -collapse and oil layer protective agents.With the development and development of oil exploration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 刘建锟杨涛贾丽彭绍忠贾永忠葛海龙孟兆会
Owner CHINA PETROLEUM & CHEM CORP
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