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Preparation method and application of surfactant-grafted nano-silica

A nano-silica and surfactant technology, applied in the field of oil and gas well acidification, can solve the problems of high acid-rock reaction rate and foam instability, and achieve the goal of increasing the half-life of foam, good foam stabilization performance, and reducing the acid-rock reaction rate Effect

Active Publication Date: 2018-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of unstable foam and high acid-rock reaction rate in the actual formation environment where the existing foam acid exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The invention provides a kind of preparation method of surfactant grafted nano-silica, comprising the following steps:

[0020] Step 1), prepare coupling agent precursor A

[0021] Add alkyl dimethyl allyl ammonium chloride and methyl dichlorosilane into the reactor A filled with solvent according to the mass ratio of 200~300:100, under the action of catalyst, pass nitrogen protection, and carry out stirring and heating at the same time , the stirring speed is 10-200r / min, heated to 40-90°C, reacted for 1-5h, and then distilled under reduced pressure to obtain the coupling agent precursor A, the chemical formula of the coupling agent precursor A is Wherein, R in the chemical formula is the alkyl group in the alkyl dimethyl allyl ammonium chloride;

[0022] Step 2), prepare coupling agent

[0023] Add methanol with a mass fraction of 50% in reactor B and heat to 60-90°C, then add coupling agent precursor A to reactor B, the mass ratio of coupling agent precursor A to ...

Embodiment 1

[0032] Add 28.95 g of dodecyldimethylallyl ammonium chloride, 12.65 g of methyldichlorosilane and 20 g of toluene in a 100 mL three-necked flask A, add 0.4 g of 1.0% wt isopropanol solution of chloroplatinic acid, and blow nitrogen Protection, start stirring and heating to 65°C for 2 hours, pressurized distillation to obtain the coupling agent precursor;

[0033] Add 20.0 g of methanol into a 100 mL three-necked flask A, stir and dissolve evenly, then transfer to a constant pressure dropping funnel;

[0034] Add 20.0g of methanol to a 100mL three-necked flask B and heat it to 65°C, blow nitrogen gas, add the methanol solution of the coupling agent precursor dropwise, drop it completely in 30 minutes, raise the temperature to 80°C and continue the reaction for 4h, then distill under reduced pressure to obtain the coupling agent-1.

[0035] In a 500ml three-necked flask, add 200g of toluene, 50nm nano silicon dioxide (NanoSiO 2 ) 30g, silane coupling agent-11.5g ultrasonically...

Embodiment 2

[0037] Add 13.05g of dedecyldimethylallyl ammonium chloride, 14.47g of dodecyldimethylallyl ammonium chloride, 12.1g of methyldichlorosilane and 20g of toluene into a 100mL three-necked flask A, add 0.5g of 1.0%wt isopropanol solution of chloroplatinic acid, protected by nitrogen, started stirring and heating to 65°C for 2h, and pressurized distillation to obtain the coupling agent precursor;

[0038] Add methanol 20.0 into a 100mL three-neck flask A, stir to dissolve evenly, then transfer to a constant pressure dropping funnel;

[0039] Add 20.0g of A to a 100mL three-necked flask B, heat to 65°C, blow nitrogen, add the methanol solution of the coupling agent precursor dropwise, drop it completely in 30 minutes, raise the temperature to 80°C and continue the reaction for 4h, and distill under reduced pressure to obtain the coupling Agent-2.

[0040] In a 500ml three-necked flask, add 200g of toluene, 50nm nano silicon dioxide (NanoSiO 2 ) 30g, silane coupling agent-21.8g ul...

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Abstract

The invention belongs to the technical field of oil and gas well acidification, and specifically provides a preparation method of surfactant-grafted nano-silica. Firstly, alkyl (C8-C14) dimethyl allylammonium chloride and methyl dichlorosilane are subjected to a hydrosilylation reaction and an esterification reaction under the catalysis of chloroplatinic acid to obtain a coupling agent; then nano-silica is activated at 120 DEG C for 24h, the activated nano-silica is uniformly dispersed in toluene, and then the coupling agent is added to continue a reaction for 2-15h, and the surfactant-grafted nano-silica is obtained after centrifugation, washing and drying. According to the preparation method of the surfactant-grafted nano-silica, a surfactant is grafted on the surface of the nano-silica, so that the problems that foams are unstable and acid-rock reaction rate is high under an actual stratum environment with a foam acid are solved, the half-life period of the foams can be effectivelyincreased, and the acid-rock reaction rate can be effectively reduced; and the surfactant-grafted nano-silica has the characteristic of effectively delaying the acid-rock reaction, and can be used toacidification operation of carbonate rock formations to increase an acidification penetration distance, thereby achieving a purpose of deep acidification.

Description

technical field [0001] The invention belongs to the technical field of acidification of oil and gas wells, and in particular relates to a method for preparing surfactant-grafted nano silicon dioxide and its application. Background technique [0002] Increasing the penetration distance of acidizing is an important way to increase production in acid fracturing. An excellent acid liquid system should first have the ability to control the H in the liquid phase + The ability to diffuse to the rock surface to reduce the acid-rock reaction rate, achieve uniform acid distribution, and slow acidification, thereby increasing the acidification penetration distance and achieving the purpose of deep acidification. [0003] Foam acid is a foam system with acid as the continuous phase and bubbles as the dispersed phase. It can rely on foam to reduce the contact area of ​​acid rock and reduce the diffusion rate of hydrogen ions. At the same time, foam has selectivity to permeability, which...

Claims

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Application Information

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IPC IPC(8): C07F7/10C09K8/74C09K8/584
CPCC07F7/0838C07F7/0874C09K8/584C09K8/74
Inventor 李宁军丁里石华强李小玲丁勇孟磊苏国辉祖凯刘晓瑞马新星
Owner PETROCHINA CO LTD
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