Nanometer drag reducer for sandstone surface pretreatment and preparation method of nanometer drag reducer

A technology for surface pretreatment and drag reducing agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient hydrophobicity, reducing water injection pressure, restrictions, etc., to facilitate industrial production, reduce construction costs, The effect of simple and easy preparation process

Inactive Publication Date: 2012-12-26
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only two cases of patents related to nano-drag reducing and injection-increasing agents have been found. Patent 201010138382.6 involves a nano-polysilicon particle and its preparation method and application. The nano-polysilicon particle has a small particle size, uniform distribution, and good hydrophobicity. It has good dispersibility in organic medium, and it has a good application effect on water injection wells in low-permeability oilfields or ultra-low-permeability oilfields as a drag-reducing and injection-increasing agent; the disadvantage is that diesel oil is required to carry it into the well, and the cost

Method used

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  • Nanometer drag reducer for sandstone surface pretreatment and preparation method of nanometer drag reducer
  • Nanometer drag reducer for sandstone surface pretreatment and preparation method of nanometer drag reducer
  • Nanometer drag reducer for sandstone surface pretreatment and preparation method of nanometer drag reducer

Examples

Experimental program
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Example Embodiment

[0019] Example 1

[0020] Pour 125g of surfactant fourteen-carbon alpha-olefin sulfonate, OP-1030g, 65g of PO-EO copolymer with molecular weight of 2400, 150g of co-surfactant propylene glycol and 100g of triethanolamine into the mixer, and the machine at room temperature Stir for 8min. After stirring evenly, slowly add 30g of γ-(2,3 glycidoxy)propyltrimethoxysilane modified nano-silica at 5000r / min. After all the addition, continue to stir for 10min, and then The water bath is kept at 60°C for 20 minutes, and then poured into a high-pressure homogenizer for dispersion, homogenization and emulsification to obtain 500g of nano drag reducer 1 for sandstone surface pretreatment.

Example Embodiment

[0021] Example 2

[0022] Pour 60g of surfactant dodecylbenzene sulfonate, OP-1060g, Span-8055g, 160g of isopropanol and 140g of glycerol as auxiliary surfactants into the mixer, and mechanically stir for 12min at room temperature, and stir evenly Then slowly add 15g of γ-(2,3 glycidoxy) propyl trimethoxysilane modified nano silica and 10g of γ-aminopropyl triethoxy silane modified nano silica at 3000r / min. After all the silica is added, continue to stir for 8 minutes, then keep it in a water bath at 60°C for 20 minutes, and pour it into a high-pressure homogenizer to disperse, homogenize and emulsify to obtain 500 g of nano drag reducer 2 for sandstone surface pretreatment.

Example Embodiment

[0023] Example 3

[0024] Pour the surfactant cetyl quaternary ammonium salt 80g, OP-1045g, Tween-8040g and the auxiliary surfactants 130g ethylenedi alcohol and glycerol 170g into the mixer, mechanically stir at room temperature for 10 minutes, and then stir evenly. Slowly add 25g N-β (aminoethyl) γ-aminopropyltrimethoxysilane modified nano silica 10g γ-chloropropyltrimethoxysilane modified nano silica at a speed of 6000r / min, all After the addition, continue to stir for 10 minutes, then keep the temperature in a water bath at 60°C for 30 minutes, and pour it into a high-pressure homogenizer for dispersion, homogenization and emulsification to obtain 500 g of nano drag reducer 3 for sandstone surface pretreatment.

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Abstract

The invention relates to a nanometer drag reducer for the sandstone surface pretreatment and a preparation method of the nanometer drag reducer. The nanometer drag reducer comprises following components: 5-15% of nano-silica material modified by a silane coupling agent, 25-50% of surfactant and 40-70% of cosurfactant, wherein the surfactant is one or two kinds of an anion active agent, a cation surface active agent, a non-ionic surface active agent and an amphoteric surfactant. The nanometer drag reducer has the advantages that the nanometer drag reducer can be mixed with water in a certain proportion to form an uniform and transparent micro-emulsion, and diesel is replaced by water in the work progress, so that the construction cost is greatly lowered; the nanometer drag reducer can be firmly adsorbed on the surface of rocks so as to form a layer of strong nano hydrophobic membrane, so that the flow resistance of the formation water is effectively reduced and the water flooding effect is enhanced.

Description

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Claims

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Application Information

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Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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