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Phase-change microcapsule, preparation method thereof, intelligent temperature-control water-based drilling fluid and application

A technology of phase-change microcapsules and water-based drilling fluids, which is applied in the field of drilling fluids, can solve problems such as inability to effectively inhibit hydrate decomposition, and achieve good compatibility and environmental performance, excellent low-temperature rheology, and the effect of inhibiting hydrate decomposition

Pending Publication Date: 2021-02-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the drilling fluid in the prior art cannot effectively inhibit the decomposition of hydrates, to provide a phase change microcapsule and its preparation method, and an intelligent temperature-controlled water-based drilling fluid and its application. The intelligent temperature-controlled water-based drilling fluid It can intelligently regulate the temperature of downhole drilling fluid, and further, it can avoid the decomposition of hydrate caused by the increase of drilling fluid temperature

Method used

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  • Phase-change microcapsule, preparation method thereof, intelligent temperature-control water-based drilling fluid and application

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preparation example Construction

[0033] The second aspect of the present invention provides a kind of preparation method of aforementioned phase-change microcapsules, wherein, described preparation method comprises:

[0034] (1) first contacting the wall material, an optional wall material strengthening agent and water to obtain a wall material prepolymer;

[0035] (2) The core material is contacted with the water phase for the second time, and the water phase is a mixed solution of an emulsifier and water to form an oil / water emulsion;

[0036] (3) adding the wall material prepolymer dropwise into the oil / water emulsion for reaction, and then washing, suction filtering and drying to obtain phase change microcapsules.

[0037] According to the present invention, the water is preferably deionized water.

[0038] In the present invention, the preparation method of the phase change microcapsules comprises: stirring and mixing the wall material, an optional wall material strengthening agent and deionized water, ...

preparation example 1

[0057] This preparation example is to illustrate the preparation of phase change microcapsules.

[0058] Mix and stir 30g melamine, 60g formaldehyde solution (37%) and 33mL deionized water, adjust the pH value to 8 with triethanolamine, react in a constant temperature water bath at 75°C for 4 hours to obtain a wall material prepolymer; add 0.8g OP-10 to In 120mL of ionized water, add 28g of dodecyl alcohol and octanoic acid with a mass ratio of 50.6:49.4 dropwise into the water phase in a constant temperature water bath at 65°C, and stir for 1h at 1500r / min to form an oil / water emulsion; Add the wall material prepolymer solution dropwise to the emulsion at a rate of 0.5mL / min, adjust the pH value to 4 with citric acid, and react in a constant temperature water bath at 65°C for 5 hours; after the reaction, wash with ethanol and pump Filter and dry at 75°C for 24h.

[0059] Results The phase change microcapsule powder was prepared, marked as XW-1; and the average particle size ...

preparation example 2

[0061] This preparation example is to illustrate the preparation of phase change microcapsules.

[0062] 28g of melamine, 58g of formaldehyde solution (37%), 0.5g of trimanganese tetraoxide and 33g of deionized water were mixed and stirred, the pH value was adjusted to 8 with triethanolamine, and reacted in a constant temperature water bath at 80°C for 4 hours to obtain a wall material prepolymer; Add 1.0g of OP-10 into 120mL of deionized water, add 30g of dodecyl alcohol and decanol with a mass ratio of 1:1 dropwise into the water phase in a constant temperature water bath at 70°C, and stir at 1500r / min for 1h to form oil / water Emulsion: Add the wall material prepolymer solution dropwise into the emulsion at a rate of 0.4mL / min after the reaction, adjust the pH value to 3.5 with citric acid, and react in a constant temperature water bath at 70°C for 5 hours; After the reaction, wash with ethanol, filter with suction, and dry at 70°C for 24h.

[0063] Results The phase change...

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Abstract

The invention relates to the field of drilling fluids, and discloses a phase change microcapsule, a preparation method thereof, an intelligent temperature control water-based drilling fluid and application. The phase-change microcapsule comprises a core material and a wall material coating the outer surface of the core material, wherein the wall material also contains an optional wall material enhancer; the core material is selected from one or more of n-tetradecane, dodecanol, decanol and caprylic acid; the wall material is urea resin and / or melamine- formaldehyde resin; and the wall materialenhancer is manganous-manganic oxide. The intelligent temperature control water-based drilling fluid can intelligently regulate and control the temperature of underground drilling fluid, and hydratedecomposition caused by temperature rise of the drilling fluid can be avoided.

Description

technical field [0001] The invention relates to the technical field of drilling fluid, in particular to a phase change microcapsule and a preparation method thereof, intelligent temperature-controlled water-based drilling fluid and its application. Background technique [0002] Natural gas hydrate is extremely rich in resources and is considered to be the most potential alternative energy source in the future. More than 90% of natural gas hydrate resources occur in seabed sediments. Although gas hydrate is a new type of high-efficiency energy source, the change of its occurrence state in drilling engineering can cause serious engineering problems. ①The change of ground stress, the cutting of the drill bit and the friction between the drilling tool and the well wall will generate a large amount of heat, which will lead to the temperature rise of the drilling fluid, the hydrate around the well wall will decompose, and the well wall will lose its cement support and collapse; t...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02C09K8/12C09K8/14
CPCC09K5/063B01J13/02C09K8/12C09K8/14
Inventor 赵欣邱正松张震钟汉毅耿麒房清超孙昊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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