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Modified epoxy asphalt particles, full oil-based drilling fluid and preparation method thereof

An epoxy bitumen and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, building components, etc., can solve the problems of poor suspension ability and high temperature resistance, complex asphalt technology, and increased filtration volume. , to achieve the effect of stable properties, simplified process and increased deformability

Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to the existing technology, the process of preparing high softening point asphalt is complicated and costly, and the oil solubility of asphalt particles is high in the process of applying full oil-based drilling fluid, and the drilling fluid system lacks asphalt particles to effectively plug the formation channels and fractures , so that the fluid loss increases, the suspension ability and high temperature resistance become worse, etc., the invention provides a modified epoxy asphalt particle, a full oil-based drilling fluid and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Heat 360g of residual oil with a softening point of 41.6°C to 155°C in an asphalt reactor, add 10.8g of maleic anhydride, and pass through N 2 Keep the pressure of the asphalt reactor at 0.9 MPa, and react for 4.5 hours to obtain grafted activated asphalt. Cool the grafted activated asphalt to 125°C, add 50.4g of coco-based 1,3-propylenediamine and stir evenly, then add 72g of CYD-128 type epoxy resin, and continue stirring for 18 minutes to obtain modified epoxy asphalt; Put 120g of sulfur powder in a closed sulfur reactor, heat it to 290°C, add 0.10g of isoprene after 50 minutes, and feed N 2 Keep the pressure at 1.2MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully contact in countercurrent and keep 35 minute. Ope...

Embodiment 2

[0050] Heat 300g of oxidized asphalt with a softening point of 52.2°C to 170°C in an asphalt reactor, add 13.8g of polyoxalic anhydride, and pass through N 2 Keep the pressure of the asphalt reactor at 1.6 MPa, and react for 5.0 hours to obtain grafted activated asphalt. Cool the grafted activated asphalt to 130°C, add 28.6g of octadecyl dimethyl tertiary amine, stir evenly, then add 36.5g of CYD-128 type epoxy resin, and continue to stir for 20 minutes to obtain epoxy asphalt; Sulfur powder is placed in a closed sulfur reactor, heated to 300°C, and after 50 minutes, 0.24g of 1-dodecene is added, and N 2 Keep the pressure at 1.5MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully contact in countercurrent and keep 40 minute. ...

Embodiment 3

[0053] Heat 450g of deasphalt with a softening point of 61.2°C to 175°C in an asphalt reactor, add 28.4g of polyisobutylene succinic anhydride, and pass inert gas to keep the pressure of the asphalt reactor at 1.3MPa, and react for 6.0 hours to obtain the following stick activated asphalt. Cool the grafted activated asphalt to 140°C, add 85.6g of hydrogenated tallow propylene diamine, stir evenly, then add 105g of E-44 type epoxy resin, and continue to stir for 25 minutes to obtain epoxy asphalt; put 200g of sulfur powder in In a closed sulfur reactor, heat to 310°C, add 0.32g of hexachloro-p-xylene after 55 minutes, and feed N at the same time 2 Keep the pressure at 1.2MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully conta...

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Abstract

The invention discloses a modified epoxy asphalt particle and a full-oil-based drilling fluid, and preparation methods thereof. The modified epoxy asphalt particle comprises a core composed of epoxy asphalt and a shell formed by a modifier. The epoxy asphalt is prepared by subjecting raw asphalt and organic acid anhydride to grafting activation and then carrying out a reaction with epoxy resin anda curing agent. The full-oil-based drilling fluid comprises, by weight, 90 to 95 parts of base oil, 1 to 3 parts of organoclay, 1 to 5 parts of an emulsifier and 1 to 6 parts of the modified epoxy asphalt particle. The modified epoxy asphalt particle is prepared by respectively spraying molten epoxy asphalt and molten sulfur from the upper end and the lower end of a reaction tower for counter-current contact and quenching a product in a quenching solution. The drilling fluid is prepared by mixing all the components. According to the invention, the modified epoxy asphalt particle is used as aperformance regulator and can maintain good particle state and high-temperature deformation capability in the drilling fluid, so plugging and fluid-loss-reducing effects are improved.

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 particle and a preparation method thereof, and an all-oil-based drilling fluid using the modified epoxy asphalt particle as a performance regulator. Background technique [0002] With the gradual development of oil and gas exploration to deep layers, the chances of drilling high-temperature and high-pressure formations are gradually increasing. All of these put forward higher requirements on the drilling fluid system. Compared with water-based drilling fluid, oil-based drilling fluid has strong anti-pollution ability, good lubricity, strong inhibition, is conducive to maintaining the stability of the well wall, can protect oil and gas layers to the greatest extent, and is easy to maintain. The excellent high-temperature stability and inhibition of oil-based drilling fluid make it more obvious in drilling complex well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/32C09K8/502C08L95/00C08L63/00C08K3/06
CPCC08L95/00C08L2201/08C09K8/035C09K8/32C09K8/502C09K2208/12C08L63/00C08K3/06
Inventor 傅丽姚汉荣李志军郭皎河刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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