Layer-by-layer self-assembled calcium oxide microcapsule as well as preparation method and application thereof

A layer-by-layer self-assembly, calcium oxide technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of high reaction speed and heat release speed, difficult to control heat release, and low utilization efficiency, etc. Achieve the effect of preventing reservoir damage, low cost and protecting reservoir

Pending Publication Date: 2022-07-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of the current exploitation of natural gas hydrate in sea areas, aiming at the problems of high cost, high energy consumption and difficult control of heat release caused by the injection of hot fluid by heating method, as well as the reaction speed and To solve the problems of fast exothermic speed, high exothermic temperature, difficulty in control, and low utilization efficiency, the present invention provides a layer-by-layer self-assembled calcium oxide microcapsule and its preparation method and application

Method used

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  • Layer-by-layer self-assembled calcium oxide microcapsule as well as preparation method and application thereof
  • Layer-by-layer self-assembled calcium oxide microcapsule as well as preparation method and application thereof
  • Layer-by-layer self-assembled calcium oxide microcapsule as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for preparing layer-by-layer self-loading calcium oxide microcapsules, comprising the following steps:

[0052] (a) Preparation of polyaldehyde sodium alginate

[0053] i. Disperse 10 g of sodium alginate in 50 mL of absolute ethanol to prepare suspension I.

[0054] ii. Dissolve 5.404 g of sodium periodate in 50 mL of pure water to prepare solution II.

[0055] iii. Add Solution II to Suspension I, and magnetically stir at room temperature in the dark for 6 hours, then add 3.5 mL of ethylene glycol to terminate the reaction.

[0056] iv. Add 100 mL of the reactant into 500 mL of absolute ethanol to separate out a precipitate, filter with suction, and vacuum dry at 40° C. to obtain sodium polyaldehyde alginate.

[0057] (b) Preparation of modified calcium oxide cores

[0058] i. Uniformly mix 1 mL of 3-aminopropyltrimethoxysilane and 100 mL of absolute ethanol at 25° C. to obtain a silane coupling agent solution.

[0059] ii. Mix 10 g of calcium oxide with ...

Embodiment 2

[0068] A method for preparing layer-by-layer self-loading calcium oxide microcapsules, comprising the following steps:

[0069] (a) Preparation of polyaldehyde sodium alginate

[0070] i. Disperse 10 g of sodium alginate in 50 mL of absolute ethanol to prepare suspension I.

[0071] ii. Dissolve 5.404 g of sodium periodate in 50 mL of pure water to prepare solution II.

[0072] iii. Add Solution II to Suspension I, and magnetically stir at room temperature in the dark for 6 hours, then add 3.5 mL of ethylene glycol to terminate the reaction.

[0073] iv. Add 100 mL of the reactant into 500 mL of absolute ethanol to separate out a precipitate, filter with suction, and vacuum dry at 40° C. to obtain sodium polyaldehyde alginate.

[0074] (b) Preparation of modified calcium oxide cores

[0075] i. Uniformly mix 1 mL of 3-aminopropyltrimethoxysilane and 100 mL of absolute ethanol at 25° C. to obtain a silane coupling agent solution.

[0076] ii. Evenly mix 20 g of calcium oxid...

Embodiment 3

[0085] A method for preparing layer-by-layer self-loading calcium oxide microcapsules, comprising the following steps:

[0086] (a) Preparation of polyaldehyde sodium alginate

[0087] i. Disperse 10 g of sodium alginate in 50 mL of absolute ethanol to prepare suspension I.

[0088] ii. Dissolve 5.404 g of sodium periodate in 50 mL of pure water to prepare solution II.

[0089] iii. Add Solution II to Suspension I, and magnetically stir at room temperature in the dark for 6 hours, then add 3.5 mL of ethylene glycol to terminate the reaction.

[0090] iv. Add 100 mL of the reactant into 500 mL of absolute ethanol to separate out a precipitate, filter with suction, and vacuum dry at 40° C. to obtain sodium polyaldehyde alginate.

[0091] (b) Preparation of modified calcium oxide cores

[0092] i. Uniformly mix 1 mL of 3-aminopropyltrimethoxysilane and 100 mL of absolute ethanol at 25° C. to obtain a silane coupling agent solution.

[0093]ii. Mix 40 g of calcium oxide with t...

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Abstract

The invention provides a layer-by-layer self-assembled calcium oxide microcapsule as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a modified calcium oxide core by using a modifier 3-aminopropyltrimethoxysilane; and then wrapping the calcium oxide core with multi-aldehyde sodium alginate, chitosan and multi-aldehyde sodium alginate in sequence, so as to prepare the calcium oxide microcapsule. The calcium oxide microcapsule can effectively slow down the reaction speed and heat release speed of calcium oxide and water, the effect of delaying reaction and heat release is achieved, reaction and heat release are easy to control, the calcium oxide microcapsule can go deep into a reservoir, the utilization efficiency is high, the cost is low, the reservoir can be protected, the well wall stability in the drilling process is improved, and the safety in the hydrate drilling and production process is improved.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a layer-by-layer self-assembled calcium oxide microcapsule and a preparation method and application thereof. Background technique [0002] Natural gas hydrate is a cage-type crystal formed by gas and water under low temperature and high pressure conditions. It is an efficient and clean energy source. More than 97% of the hydrates are distributed on the edge of ocean continents. They have huge energy potential but are difficult to exploit. Also big. At present, the exploitation of natural gas hydrate mainly realizes the effective development of natural gas hydrate by changing the phase equilibrium conditions of natural gas hydrate in the reservoir, so as to convert the natural gas hydrate into natural gas and water. The natural gas hydrate exploitation technologies in my country's sea areas include pressure reduction method, heating method, CO 2 Replacem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/592B01J13/14E21B41/00E21B43/01E21B43/24
CPCC09K8/592B01J13/14E21B41/0099E21B43/01E21B43/24Y02P90/70
Inventor 王金堂白宇靖邵子桦吕开河黎剑王韧白英睿黄贤斌刘敬平金家锋孙金声
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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