Modified nano silicon dioxide foam stabilizer and preparation method thereof

A nano-silica, foam stabilizer technology, applied in chemical instruments and methods, silicon organic compounds, drilling compositions, etc., can solve the problem of poor temperature and salt resistance and shear resistance of polymers, foaming ability drop and other problems, to achieve the effect of good stability, uniform and fine foam, easy to dissolve and disperse

Inactive Publication Date: 2017-10-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of polymer will reduce the foaming ability of the system, and the temperature and salt resistance and shear resistance of the polymer are poor, which cannot fully meet the requirements of foam flooding stability.

Method used

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  • Modified nano silicon dioxide foam stabilizer and preparation method thereof
  • Modified nano silicon dioxide foam stabilizer and preparation method thereof
  • Modified nano silicon dioxide foam stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Weighing 1g of activated nano-SiO with a particle size of 100nm 2 , put into the Erlenmeyer flask, add 20g of DMF after dehydration treatment, fully stir evenly, and ultrasonically disperse for 15min; weigh 3g of maleic anhydride, add 5g of DMF after dehydration treatment to dissolve, add into the Erlenmeyer flask, and mix evenly; place the three-necked flask On a magnetic stirrer, the reaction was stirred at a constant temperature of 60° C. for 5 h. After the reaction was completed, 3.85 g of sodium sulfite was weighed to make a saturated aqueous solution, which was added dropwise into the reaction system, and stirred for 1 h. Gained reaction product is centrifuged and washed, and dried to obtain a nano-foam stabilizer, which is denoted as 1 # .

Embodiment 2

[0026] Embodiment 2: Weighing 1g of nano-SiO with a particle size of 100nm after activation treatment 2 , put into the Erlenmeyer flask, add 10g of DMF after dehydration treatment, fully stir evenly, and ultrasonically disperse for 15min; weigh 3g of maleic anhydride, add 5g of DMF after dehydration treatment to dissolve, add into the Erlenmeyer flask, and mix evenly; place the three-necked flask On a magnetic stirrer, the reaction was stirred at a constant temperature of 70° C. for 3 h. After the reaction was completed, 3.85 g of sodium sulfite was weighed to make a saturated aqueous solution, which was added dropwise into the reaction system, and stirred for 1 h. The resulting reaction product was centrifuged, washed, dried, and recorded as 2 # .

Embodiment 3

[0027] Example 3: Weighing 1 g of activated nano-SiO with a particle size of 100 nm 2 , put into the Erlenmeyer flask, add 10g of DMF after dehydration treatment, fully stir evenly, and ultrasonically disperse for 15min; weigh 3g of maleic anhydride, add 5g of DMF after dehydration treatment to dissolve, add into the Erlenmeyer flask, and mix evenly; place the three-necked flask On a magnetic stirrer, the reaction was stirred at a constant temperature of 80° C. for 5 h. After the reaction, 3.85g of sodium sulfite was weighed to form a saturated aqueous solution, which was dropped into the reaction system and stirred for 1 hour. The resulting reaction product was centrifuged, washed, dried, and recorded as 3 # .

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Abstract

The invention relates to a modified nano silicon dioxide (nano SiO2) foam stabilizer and a preparation method thereof. The nano foam stabilizer is prepared by carrying out hydrophilic modification on the nano SiO2. The preparation method comprises the following steps: activating the nano SiO2 by calcination, and uniformly dispersing in dimethylformamide (DMF), wherein the mass ratio of the nano SiO2 to the DMF is 1:10-1:30; adding maleic anhydride, wherein the mass ratio of the nano SiO2 to the maleic anhydride is 1:1-1:3; stirring at 60-80 DEG C to react for 3-5 hours, and adding a sodium sulfite saturated water solution, wherein the mole ratio of the maleic anhydride to the sodium sulfite is 1:1; and stirring to react for 1 hour, carrying out centrifugal dehydration, washing and drying. The nano foam stabilizer for enhancing foam stability of the foam flooding system has the characteristics of simple preparation technique, favorable foaming property and favorable foam stability, and has the characteristics of excellent foaming property and excellent foam stability especially when being compounded with the organic high-polymer foam stabilizer polyacrylamide.

Description

technical field [0001] The invention relates to a nano silicon dioxide foam stabilizer and a preparation method thereof, in particular to a modified nano silicon dioxide foam stabilizer and a preparation method thereof. Background technique [0002] The exploitation of crude oil can be divided into three stages: the first stage refers to the eruption of crude oil by the pressure of the formation, and its recovery rate is about 15%; in the later stage of self-spraying, water can be injected into the formation from the well to maintain the formation pressure, It is called secondary oil recovery, and its recovery rate is about 15% to 20%; after water flooding, the residual oil in the formation still accounts for 60% to 70%, and they are trapped in the sandstone pores of the reservoir in discontinuous oil blocks Among them, physical and chemical methods are required to drive out, which is called tertiary oil recovery. [0003] The tertiary oil recovery methods mainly include th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594C07F7/21
CPCC07F7/21C09K8/58
Inventor 张宝华谈惠洁沈萍萍张所明王新俊邹米华顾健星陈奇兵王英迪
Owner SHANGHAI UNIV
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