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Modified epoxy asphalt, water-based drilling fluid and preparation method thereof

A technology of water-based drilling fluid and epoxy asphalt, which is applied in chemical instruments and methods, drilling compositions, building components, etc., can solve the problems of drilling fluid plugging, anti-slumping, and reduction of fluid loss. Use performance, complex asphalt process and other issues, to achieve the effect of improving the overall mechanical properties and softening point, excellent high temperature resistance, and improving overall performance

Active Publication Date: 2022-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the existing technology, the process of preparing high softening point asphalt is complicated, and the asphalt products used in water-based drilling fluids have low softening points and large particles, and their dispersion performance in drilling fluids is not good. To solve problems such as preventing collapse, stabilizing the well wall, and reducing fluid loss, the invention provides a modified epoxy asphalt, water-based drilling fluid and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 65g of ethylenediamine and 38g of phenol into the reactor, stir and raise the temperature to dissolve, slowly add 50g of 37wt% formaldehyde aqueous solution dropwise at 50°C, drop it over 80min, then react at 80°C for 2.5h, and heat up to 180°C, Vacuum dehydration to obtain a curing accelerator; heat 200g of vacuum residue with a softening point of 36.5°C to a molten state, add 16g of coumarone resin and 3g of ethylene stearamide, stir for 15min, and add 8.5g of LP-3 type Stir the liquid polysulfide rubber for 10 minutes, add 29.6g of methyl tetrahydrophthalic anhydride and 7.8g of the curing accelerator obtained above, stir for 20 minutes, then add 39.2g of CYD-128 epoxy resin, stir for 15 minutes, and then keep the temperature at 130°C React for 5 hours and cool to obtain modified epoxy asphalt.

[0054] Take 100g of the above-mentioned modified epoxy asphalt and add it to 150g of water, add 4.2g of oleic acid polyoxyethylene ether at the same time, and grind it w...

Embodiment 2

[0056] Add 46g m-xylylenediamine and 32g phenol into the reactor, stir and raise the temperature to dissolve, slowly add 36.2g aqueous solution containing 37wt% formaldehyde dropwise at 75°C, drop it in 65min, then react at 90°C for 2.5h, and heat up to 170°C, vacuum dehydration to obtain a curing accelerator; heat 200g of vacuum residue with a softening point of 42.6°C to a molten state, add 23.5g of coumarone resin and 8.2g of ethylene stearamide, stir for 20min, add 12.6 g of liquid nitrile rubber and stirred for 10 min, added 33.8 g of methyl hexahydrophthalic anhydride and 9.2 g of the curing accelerator obtained above, stirred for 15 min, then added 45.8 g of E-44 type epoxy resin, stirred for 15 min, and then heated at 135 ° C React at constant temperature for 6.5 hours, and cool to obtain modified epoxy asphalt.

[0057] Take 100g of the above-mentioned modified epoxy asphalt and add it to 180g of water, add 5.2g of nonylphenol polyoxyethylene ether at the same time, a...

Embodiment 3

[0059] Add 51.2g of ethylenediamine and 28.6g of phenol into the reactor, stir and raise the temperature to dissolve, slowly add 44.6g of 37wt% formaldehyde aqueous solution dropwise at 70°C, drop it in 55min, then react at 95°C for 3.0h, and heat up to 165°C, vacuum dehydration to obtain a curing accelerator; heat 200g of oxidized pitch with a softening point of 54.8°C to a molten state, add 19.5g of coumarone resin and 7.4g of ethylene stearamide, stir for 20min, add 11.2g of liquid butyl Stir the nitrile rubber for 10 minutes, add 26.9 g of methyl tetrahydrophthalic anhydride and 9.4 g of the curing accelerator obtained above, stir for 15 minutes, then add 51.8 g of CYD-128 type epoxy resin, stir for 30 minutes, and then react at a constant temperature of 140 ° C for 4.5 Hours, cooled to obtain modified epoxy asphalt.

[0060] Take 100g of the above-mentioned modified epoxy asphalt and add it to 120g of water, add 5.4g polyoxyethylene laurate at the same time, and grind it ...

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Abstract

The invention discloses a modified epoxy asphalt, a water-based drilling fluid and a preparation method thereof. The modified epoxy asphalt, in parts by weight, includes: 100 parts of base asphalt, 1-20 parts of compatibilizer, 1-10 parts of toughening agent, 5-20 parts of curing agent, 1-5 parts of curing accelerator parts, 5 to 30 parts of epoxy resin; wherein, the curing accelerator includes polyamines, phenols and products obtained by reacting aldehyde-containing aqueous solutions. The modified epoxy asphalt fluid is added to the water-based drilling fluid of the present invention. The modified epoxy asphalt not only has a small particle size, a high softening point, and a certain elastic deformation ability, but also has excellent high temperature resistance. The drilling fluid When used at high temperature, it has good rheological properties and high temperature and high pressure drop fluid loss effect.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and production, and in particular relates to a modified epoxy asphalt, a water-based drilling fluid and a preparation method thereof. Background technique [0002] With the development of petroleum exploration and development, the drilling depth continues to deepen, the formations encountered become more and more complex, and the number of special craft wells such as directional wells and horizontal wells is gradually increasing. This makes drilling engineering put forward higher requirements on the performance of drilling fluid, especially the ability to resist high temperature. As an important drilling fluid treatment agent, asphalt products have good comprehensive effects such as anti-slumping, lubrication, reducing fluid loss and high temperature stability. However, the general softening point bitumen cannot meet the high-temperature operation requirements in deep wells due to exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L45/02C08L81/04C08L9/02C08K5/20C09K8/24
CPCC08L95/00C09K8/24C08L2205/035C08L2201/08C08L45/02C08L81/04C08L9/02C08K5/20
Inventor 傅丽郭皎河刘成郭小圣刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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