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Asphalt composition granule suitable for wider temperature drilling and preparation method thereof

An asphalt composition and a technology for the composition, which are applied to drilling compositions, chemical instruments and methods, building structures, etc., can solve the problems of reduced effective components of asphalt powder, damage of mud system, small viscoelasticity range, etc. The preparation method is simple, the high temperature performance is excellent, and the reaction efficiency is high.

Active Publication Date: 2014-05-21
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.
[0010] In addition, when the existing high softening point bitumen particles are used in the drilling fluid system, due to the single composition, there are problems such as a small viscoelastic range and a narrow service temperature range, it is difficult to continue to play a role in the downhole

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The vacuum residue with a penetration of 61 1 / 10mm at 25°C and a softening point of 46.3°C, accounting for 80.0% of the total (total mass of vacuum residue and coal tar pitch, the same below), is heated in an oxidation kettle To 140 ℃ molten state. Add coal tar pitch with a softening point of 65.4°C, accounting for 20.0% of the total amount, and heat it to 160°C in the premixing tank, then feed air and keep the pressure inside the tank at 0.12MPa for 20 minutes. Open the throttle valve, spray the coal tar pitch liquid into the oxidation kettle gradually, and adjust the air flow rate to 0.2 m after spraying completely. 3 × kg -1 × h -1 , carry out blowing oxidation, oxidation conditions and product properties are shown in Table 1.

[0037] Put 100g of high softening point asphalt in a small pulverizer, and add 5% carboxymethyl starch, 4.5% cationic starch and 0.5% cetyltrimethylammonium chloride based on the mass of the high softening point asphalt composition particl...

Embodiment 2

[0039] Vacuum residue oil with a penetration of 82 1 / 10mm at 25°C and a softening point of 45.7°C, accounting for 75.0% (m) of the total, was placed in an oxidation kettle and heated to a molten state of 130°C. Add coal tar pitch with a softening point of 49.3°C in the premix tank, accounting for 25.0% (m) of the total amount, heat it to 150°C, feed air and keep the pressure inside the tank at 0.18MPa for 35 minutes. Open the throttle valve, gradually spray the coal tar pitch liquid into the oxidation kettle, and adjust the air flow to 0.20 m after spraying completely. 3 × kg -1 × h -1 , carry out blowing oxidation, oxidation conditions and product properties are shown in Table 1.

[0040] Put 100g of high softening point asphalt in a small pulverizer, and add 7% carboxymethyl starch, 2.6% phosphate starch and 0.4% mixed fatty alcohol sodium sulfate based on the mass of the high softening point asphalt composition particles. Stir at room temperature for 20 seconds to obtain...

Embodiment 3

[0042] The vacuum residue with a penetration of 43 1 / 10mm at 25°C and a softening point of 48.5°C, accounting for 65.0% (m) of the total, was placed in an oxidation kettle and heated to a molten state of 150°C. Add coal tar pitch with a softening point of 56.2°C in the premix tank, accounting for 35.0% (m) of the total amount, heat it to 160°C, feed air and keep the pressure in the tank at 0.25MPa for 50 minutes. Open the throttle valve and gradually spray the coal tar pitch liquid into the oxidation kettle. After spraying completely, adjust the air flow rate to 0.22 m 3 × kg -1 × h -1 , carry out blowing oxidation, oxidation conditions and product properties are shown in Table 1.

[0043] Put 100g of high softening point asphalt in a small pulverizer, and add 4.5% cationic starch, 4.5% water-soluble PVA fiber and 0.1% sodium lignosulfonate based on the mass of the high softening point asphalt composition particles. Stir at room temperature for 30 seconds to obtain high sof...

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Abstract

The invention discloses an asphalt composition granule suitable for wider temperature drilling and a preparation method thereof. The asphalt composition granule comprises the following components by weight percentage: 80wt%-95wt% of a high-softening point asphalt composition, 4.9wt%-15wt% of modified starch and / or water soluble fiber, and 0.1wt%-5wt% of a promoter. Specifically, the high-softening point asphalt composition is a mixture of two or more of high-softening point asphalt with a softening point of 120-220DEG C, and the softening point difference between adjacent high-softening point asphalt ranged according to the softening point from low to high is 5-50DEG C. The promoter is one or several of sulfate, quaternary ammonium salt, or lignosulfonate. The preparation method includes: mixing and crushing the high-softening point asphalt composition, the modified starch, the water soluble fiber and the promoter to obtain the asphalt composition granule. The asphalt composition granule provided by the invention has high softening point and excellent high temperature performance, and can continuously play a part under wide-temperature range drilling operation conditions. And the preparation method is simple, and is convenient to operate.

Description

technical field [0001] The invention relates to an asphalt composition granule, in particular to a high softening point asphalt composition granule used for oil field drilling and capable of continuously functioning in a wide temperature range, as well as 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 substance...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L3/04C08L1/26C08L29/04C09K8/035
Inventor 傅丽郭皎河姚汉荣刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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