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A kind of hyperbranched organosilicon inhibitor for drilling fluid and preparation method thereof

A silicone and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of weakening effect, achieve the effect of increasing repulsion, delaying hydration time, and improving hydrophobicity

Active Publication Date: 2022-07-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the temperature increases, the force between the inhibitor and the clay gradually weakens, and the inhibitor molecules must return to the liquid phase of the drilling fluid under desorption, thus weakening the inhibitor's effect on clay hydration

Method used

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  • A kind of hyperbranched organosilicon inhibitor for drilling fluid and preparation method thereof
  • A kind of hyperbranched organosilicon inhibitor for drilling fluid and preparation method thereof
  • A kind of hyperbranched organosilicon inhibitor for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] In a sealed reaction vessel, 40g hyperbranched polyethyleneimine (0.027mol, relative molecular mass is 1481.34g / mol, the number of terminal amine groups is about 14) is dissolved in 500g 1,4-dioxane, controlled Warm to 45°C; then in N 2 Under the protection of -Isocyanatopropyldimethylmethoxysilane in a molar ratio of 1:0.1) and 4.7932 g of dodecyl isocyanate (0.02268 mol, primary amine group to dodecyl isocyanate in hyperbranched polyethyleneimine The molar concentration ratio was 1:0.06), and the reaction was continued for 8 h under continuous stirring to obtain a light yellow viscous liquid. 1,4-dioxane is removed by distillation under reduced pressure, (under normal temperature) the crude product is soaked in (excessive) benzene, filtered, the insolubles are retained, the insolubles are rinsed with benzene, and the benzene is removed by distillation under reduced pressure To a constant weight, the hyperbranched organosilicon inhibitor is obtained.

[0086] The pr...

Embodiment 2

[0090] In a sealed reaction vessel, 160g hyperbranched polyethyleneimine (0.02mol, relative molecular mass is 8000g / mol, the number of terminal amine groups is about 50±5) is dissolved in 1540g 1,4-dioxane, Control the temperature to 48°C; then in N 2 Under the protection of - Isocyanatopropylmethyldimethoxysilane in a molar ratio of 1:0.12) and 26.745 g of hexadecyl isocyanate (0.1 mol, primary amine group to hexadecyl isocyanate in hyperbranched polyethyleneimine) The molar concentration ratio was 1:0.1), and the reaction was continued for 16 h under continuous stirring to obtain a light yellow viscous liquid. 1,4-dioxane is removed by distillation under reduced pressure, (under normal temperature) the crude product is soaked in (excessive) benzene, filtered, the insolubles are retained, the insolubles are rinsed with benzene, and the benzene is removed by distillation under reduced pressure To a constant weight, the hyperbranched organosilicon inhibitor is obtained.

[0...

Embodiment 3

[0095] In a sealed reaction vessel, 150g of hyperbranched polyethyleneimine (0.0075mol, relative molecular mass of 20000g / mol, number of terminal amine groups is about 160±10) was dissolved in 3600g of dimethyl sulfoxide, and the temperature was controlled to 50°C; then at N 2 Under the protection of The molar concentration ratio of propyltrimethoxysilane is 1:0.12) and 15.8667 g perfluorododecyl isocyanate (0.024 mol, primary amine group in hyperbranched polyethyleneimine and mole of perfluorododecyl isocyanate) The concentration ratio was 1:0.02), and the reaction was continued for 22 h under continuous stirring to obtain a light yellow viscous liquid. The dimethyl sulfoxide was removed by distillation under reduced pressure, the crude product was immersed in (excess) benzene (at room temperature), filtered, the insolubles were retained, the insolubles were rinsed with benzene, and the benzene was removed by distillation under reduced pressure to constant weight , that is,...

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Abstract

The invention discloses a hyperbranched organosilicon inhibitor for drilling fluids and a preparation method thereof. The hyperbranched organosilicon inhibitor is obtained by grafting the terminal amine group of hyperbranched polyethyleneimine with siloxane and hydrophobic groups , the obtained hyperbranched organosilicon inhibitor. The silicon-oxygen bond can be combined with clay, and the hydrophobic group can impart a certain hydrophobicity to the inhibitor. The hyperbranched organosilicon inhibitor provided by the invention can have firm chemical adsorption with the water-sensitive clay minerals, and can effectively inhibit the hydration expansion and hydration dispersion of the water-sensitive clay minerals. At the same time, the introduced hydrophobic group improves the hydrophobicity of the molecular film, increases the repulsion between clay particles and water molecules, and delays the time for water molecules to enter the interior of the clay. In actual drilling construction, the water sensitivity is delayed. The hydration time of clay minerals provides favorable conditions for the removal of water-sensitive cuttings by vibrating screen, which provides favorable conditions for maintaining the performance of drilling fluids.

Description

technical field [0001] The invention belongs to the field of oilfield chemical additives, and relates to an organosilicon inhibitor for drilling fluid, in particular, to a hyperbranched organosilicon inhibitor for drilling fluid and a preparation method thereof. Background technique [0002] In drilling engineering, the water-sensitive clay minerals in the mud shale formation will hydrate, expand and disperse, resulting in a series of downhole responsible situations such as mud-wrapped bits, shrinkage, and collapsed blocks. The inhibition of the liquid puts forward higher requirements. Commonly used drilling fluid inhibitors include KCl, NH 4 Cl, HCOOK, polyacrylamide, potassium salt of polyacrylamide, polyalcohol and polyamine, etc. Among them, polyamine is recognized as the best inhibitor variety. [0003] The relative molecular mass and cationic degree of the polyamine inhibitor have a great influence on the inhibitory performance of shale. When the relative molecular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08G73/02
CPCC09K8/035C08G73/0213
Inventor 褚奇
Owner CHINA PETROLEUM & CHEM CORP
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