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Nano-solution for decompression and injection augmentation of ultra-low permeability oil reservoir water-flooding development and preparation method of nano-solution

An ultra-low permeability, oil reservoir technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as weakening the effect of pressure reduction and injection, increasing operational complexity and product price, and easy loss of nanomaterials. , to achieve the effect of facilitating large-scale construction, improving development effect and simple preparation

Active Publication Date: 2017-03-08
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the nano-fluid for depressurization and increasing injection introduces a large amount of emulsifier to form a microemulsion to improve water solubility, and it needs to induce demulsification when used on site, which increases the complexity of operation and product price. In addition, this product is a dispersion liquid system. Composed of nano-polysilicon material and surfactant (emulsifier), at the same time, a double adsorption layer of nano-material and surfactant is formed on the rock surface. The hydrophilic type gradually changes to the hydrophobic type, which leads to the loss of nanomaterials during the flushing process, and the effect of reducing pressure and increasing injection is weakened

Method used

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  • Nano-solution for decompression and injection augmentation of ultra-low permeability oil reservoir water-flooding development and preparation method of nano-solution
  • Nano-solution for decompression and injection augmentation of ultra-low permeability oil reservoir water-flooding development and preparation method of nano-solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the preparation of double-group modified nano-silica particles:

[0029] Step 1, 4g primary particle size 7nm, specific surface area 200m 2 Add / g of nano-silica and 100mL of absolute ethanol into a three-necked flask, stir for 20min, add 4g of vinyltriethoxysilane, adjust the temperature of the oil bath to 70°C, and react under nitrogen protection for 4h; The liquid was separated by centrifugation or vacuum filtration, and the precipitate or filter cake was washed 4 times with absolute ethanol, and vacuum-dried at 60°C for 24 hours to obtain a powdery solid.

[0030] Step 2, disperse the solid powder obtained in step 1 in 100mL dimethylformamide, under nitrogen protection, add 0.1mol HBr solution, heat to 50°C, stir for 4 hours, cool to room temperature, and centrifuge the resulting mixture Separation or separation by vacuum filtration, washing the precipitate or filter cake 4 times with dimethylformamide, and vacuum drying at 60° C. for 24...

Embodiment 2

[0033] Such as figure 1 As shown, the preparation of double-group modified nano-silica particles:

[0034] Step 1, 5g primary particle diameter 7nm, specific surface area 250m 2 Add / g of nano-silica and 150mL of toluene into a three-necked flask, stir for 10min, add 5g of vinyltrimethoxysilane, adjust the temperature of the oil bath to 70°C, and react under nitrogen protection for 5h; centrifuge the fully reacted dispersion Alternatively, separate by vacuum filtration, wash the precipitate or filter cake four times with absolute ethanol, and dry under vacuum at 60° C. for 24 hours to obtain a powdery solid.

[0035] Step 2: Disperse the solid powder obtained in Step 1 in 100 mL of dimethylformamide, protect it under nitrogen, add a solution containing 0.1 mol of HBr, heat to 50°C, stir for 4 hours, cool to room temperature, and dissolve the resulting mixture Separation by centrifugation or vacuum filtration, washing the precipitate or filter cake 4 times with dimethylformam...

Embodiment 3

[0038] Preparation of nano-fluid for pressure reduction and injection enhancement in ultra-low permeability reservoir water injection development:

[0039] Step 1: Weigh 1 g of the double-group-modified nano-silica particles prepared in Example 1, add it into 500 mL of water, stir evenly, and heat to 60-80° C.

[0040] Step 2, continue stirring, and add 1 mol / L NaOH aqueous solution dropwise until the double-group modified nano-silica particles are uniformly dispersed.

[0041] The particle size distribution of the double-group modified nano-silica particles in the nano-fluid for reducing pressure and increasing injection was measured by a laser particle size analyzer, and the particle size distribution of the double-group modified nano-silica particles ranged from 10 to 20 nm.

[0042] Such as figure 2 As shown, select the ultra-low permeability natural rock core with gas permeability of 1-5mD, saturate simulated oil (viscosity 5mPa·s, 25℃), and use simulated water (3%NaCl)...

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Abstract

The invention relates to an oilfield water-injection injection augmentation agent and in particular relates to a nano-solution for decompression and injection augmentation of ultra-low permeability oil reservoir water-flooding development and a preparation method of the nano-solution. The nano-solution for the decompression and injection augmentation is prepared from double-radical modified nano silicon dioxide grains and a NaOH water solution, wherein the double-radical modified nano silicon dioxide grains are commonly modified by alkyl and alkyl acid. The nano-solution for the decompression and injection augmentation is simple in preparation, uniform in dispersion and good in stability. After the nano-solution is injected into a stratum, the double-radical modified nano silicon dioxide grains are attached on surfaces of reservoir rocks; hydration films on the surfaces of the rocks are stripped to form nano adsorption layers; with the pH (Potential of Hydrogen) in a stratum water environment becomes neutral from alkaline, the surfaces of the rocks become wet, so that a lyophobic slippage effect is generated and the aims of reducing water flow resistance and injection pressure are realized.

Description

technical field [0001] The invention relates to an oilfield water injection injection enhancement agent, in particular to a nano-fluid for reducing pressure and increasing injection in the development of ultra-low permeability oil reservoir water injection and a preparation method thereof. Background technique [0002] As an efficient energy source, petroleum plays an irreplaceable role in the national economy. With the rapid growth of my country's national economy, the demand for oil continues to increase. With the current mining technology, my country's total crude oil output in 2014 was 210 million tons, and the net import of crude oil was 310 million tons. The dependence on oil imports reached 59.6%, which will cause my country to face major economic and national energy security issues. At the same time, in recent years, exploration has become more and more difficult, and the increase in proven reserves has not been large. Faced with this situation, it has become one o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/58C09K2208/10
Inventor 由庆戴彩丽张雁李玉阳赵明伟吴一宁孙永鹏赵光王欢范洪富
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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