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Nano-composite capable of preventing CO2 channeling for tight reservoir and preparation method of nano-composite

A technology of nanocomposite materials and tight oil reservoirs, which can be applied to the compounds of group 4/14 elements of the periodic table, the composition of drilling holes, and organic chemical methods, etc., and can solve the problems of not obvious application benefits of tight oil reservoirs, and achieve Good fluidity, good injectability, and low damage rate

Active Publication Date: 2017-11-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Another purpose of the present invention is to solve the problem of micron-scale chemical reagents in the prior art in CO 2 Weaknesses in improving the recovery of tight oil reservoirs by flooding, and the technical problems that the application benefits in tight oil reservoirs are not obvious, provide a CO 2 Prevention of CO by flooding to enhance recovery of tight oil reservoirs 2 Gas channeling silica nanocomposites

Method used

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  • Nano-composite capable of preventing CO2 channeling for tight reservoir and preparation method of nano-composite
  • Nano-composite capable of preventing CO2 channeling for tight reservoir and preparation method of nano-composite
  • Nano-composite capable of preventing CO2 channeling for tight reservoir and preparation method of nano-composite

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Comparison scheme
Effect test

Embodiment 1

[0058] Anti-CO 2 The preparation of gas channeling nanocomposites, the steps are as follows:

[0059] (1) Preparation of nano silicon dioxide

[0060] Add 200ml absolute ethanol, 14.6g concentrated ammonia water (concentration 35%) and 3.4g distilled water successively in the 500ml three-necked flask, place the mixed solvent in a water bath with a magnetic stirrer, and stir rapidly for 30min to ensure that the solvent is evenly mixed; then , under the condition of rapid stirring, quickly add 74.6g of ethyl orthosilicate to the mixed solvent, and react at a constant temperature of 25°C for 24h; after cooling, centrifuge, dialyze, remove unreacted raw materials and solvents, purify multiple times, and dry dry to obtain nano-silica, referred to as SNPs, with a particle size of 20-40nm.

[0061] (2) Surface modification of nano-silica

[0062] Weigh 7.5g of SNPs and dry them under vacuum at 100°C for 24h, then disperse them in 150ml of toluene, and treat them with ultrasonic wa...

Embodiment 2

[0068] Anti-CO 2 The preparation of gas channeling nanocomposites, the steps are as follows:

[0069] (1) Preparation of nano silicon dioxide

[0070] Add 300ml absolute ethanol, 21.9g concentrated ammonia water (concentration 35%) and 5.1g distilled water successively in the 500ml three-necked flask, place the mixed solvent in a water bath with a magnetic stirrer, and stir rapidly for 30min to ensure that the solvent is evenly mixed; then , under rapid stirring conditions, quickly add 89.6g orthosilicate ethyl ester to the mixed solvent, and react at a constant temperature of 25 °C for 24 hours; after cooling, centrifuge, dialyze, remove unreacted raw materials and solvents, purify multiple times, and dry dry to obtain nano-silica, referred to as SNPs, with a particle size of 20-40nm.

[0071] (2) Surface modification of nano-silica

[0072] Weigh 9.8g of SNPs, dry them under vacuum at 100°C for 24h, disperse them in 150ml of toluene, and treat them with ultrasonic waves f...

Embodiment 3

[0078] Anti-CO 2 The preparation of gas channeling nanocomposites, the steps are as follows:

[0079] (1) Preparation of nano silicon dioxide

[0080] In a 500ml three-necked flask, add 300ml of absolute ethanol, 7.3g of concentrated ammonia (concentration 35%) and 2.4g of distilled water successively, place the mixed solvent in a water bath with a magnetic stirrer, stir rapidly for 30min, and ensure that the solvent is evenly mixed; then , under the condition of rapid stirring, quickly add 52.3g ethyl orthosilicate to the mixed solvent, and react at a constant temperature at 25°C for 24h; after cooling, centrifuge, dialyze, remove unreacted raw materials and solvents, purify multiple times, and dry dry to obtain nano-silica, referred to as SNPs, with a particle size of 20-40nm.

[0081] (2) Surface modification of nano-silica

[0082] Weigh 6.0g of SNPs, dry in vacuum at 100°C for 24h, disperse in 150ml of toluene, and ultrasonically treat for 30min; then, transfer the mix...

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Abstract

The invention discloses a nano-composite capable of preventing CO2 channeling for a tight reservoir. The nano-composite is prepared from nano-silica as a core through surface modification with a silane coupling agent, Michael addition reaction with methyl acrylate and amidation with 3-dimethylaminopropylamine sequentially. The preparation method comprises the steps as follows: S1, preparing nano-silica; S2, modifying the surface of nano-silica; S3, performing Michael addition reaction on modified nano-silica; S4, performing amidation on carbomethoxy-terminated nano-silica prepared in step S3 and 3-dimethylaminopropylamine, and performing separation, purification and drying to obtain the nano-composite. The composite has good dispersibility in an aqueous phase, viscosity of a base fluid is equivalent to that of water, the composite reacts with CO2 to form a nanometer viscoelastic fluid terminated with organic carbonate, and accordingly, fluidity of CO2 is improved, CO2 is prompted to turn to the low-permeability layer, the swept volume of CO2 is increased, and the oil and gas recovery rate of the tight reservoir is increased.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a CO 2 Gas channeling nanocomposites and methods for their preparation. Background technique [0002] With the massive exploitation of conventional oil and gas reservoirs, unconventional oil and gas resources such as tight oil and gas have become important replacement areas for oil and gas resources. At present, improving the oil and gas recovery of tight oil reservoirs is the focus of oilfield workers' research. CO 2 Flooding not only effectively solves major problems such as industrial production, greenhouse gas emissions and storage in people's lives, but also has become a gas drive to enhance oil recovery due to its unique and effective displacement mechanism, such as the principle of safe injection, good fluidity, and easy mixing. A key technology of the rate. [0003] However, a large amount of conventional oil reservoir CO 2 Flooding field tests have show...

Claims

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Application Information

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IPC IPC(8): C09K8/594C07F7/08
CPCC07B2200/11C07F7/0836C09K8/594
Inventor 刘锐蒲万芬杜代军
Owner SOUTHWEST PETROLEUM UNIV
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