High softening point asphalt granules for drilling fluid and preparation method thereof

A technology of high softening point asphalt and asphalt granules, applied in the field of petroleum asphalt, can solve the problems of difficult to continue to function, narrow operating temperature range, small viscoelastic range, etc., to increase the viscoelastic use range and reduce high temperature and high pressure filtration loss volume, the effect of increasing deformability

Active Publication Date: 2017-08-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the existing high softening point bitumen is used in the drilling fluid system, due to its 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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  • High softening point asphalt granules for drilling fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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, gradually spray the coal tar pitch liquid into the oxidation kettle, and adjust the air flow rate to 0.2m after spraying completely. 3 kg -1 h -1 , carry out blowing oxidation, oxidation conditions and product properties are shown in Table 1.

[0030] Add 100g of frozen high softening point asphalt (freezing conditions: temperature -25°C, time 8 hours) into a high-speed pulverizer, mix and grind for 25 seconds to obtain high softening point asphalt powder with an average particle size o...

Embodiment 2

[0032] 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.

[0033] Add 100g of frozen high softening point asphalt (freezing conditions: temperature -30°C, time 10 hours) into a high-speed pulverizer, mix and grind for 20 seconds to obtain high softening point asphalt powder with an average particle size of 70 μm.

Embodiment 3

[0035] 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.

[0036] Add 100g of frozen high softening point asphalt (freezing conditions: temperature -40°C, time 6 hours) into a high-speed pulverizer, mix and grind for 30 seconds to obtain high softening point asphalt powder with an average particle size of 50 μm.

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Abstract

The invention discloses high-softening-point asphalt particles for drilling fluid. The high-softening-point asphalt particles comprise the following components in percentage by weight: 80-95 % of a high-softening-point asphalt composition, and 5-20 % of rubber latex, wherein the high-softening-point asphalt composition is a mixture of two or more than two kinds of high-softening-point asphalt of which the softening point ranges from 120 DEG C to 240 DEG C; the difference between softening points of adjacent high-softening-point asphalt of which the softening points are from low to high is 5-50 DEG C. The high-softening-point asphalt particles have a relatively high softening point and deformation capability, and can play function continuously under drilling operation condition with a relatively wide temperature range.

Description

technical field [0001] The invention belongs to the field of petroleum asphalt, in particular to a high softening point asphalt particle for drilling fluid and a preparation method thereof. Background technique [0002] Asphalt products are one of the important drilling fluid treatment agents, which have good comprehensive performances such as anti-slump, lubrication, emulsification, fluid loss reduction and high temperature stability. Bituminous products generally contain bitumen particles that are insoluble in water 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 drill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08L95/00C08L9/04C08L9/08C08L11/02C08L7/02C08L25/06
CPCC09K8/035
Inventor 姚汉荣傅丽郭皎河张建峰刘树华
Owner CHINA PETROLEUM & CHEM CORP
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