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Silyl ether composite defoaming agent as well as preparation method and application thereof

A technology of compound defoaming agent and defoaming agent, applied in chemical instruments and methods, composition of drilling holes, etc., can solve the problems of low surface tension, reduced surface tension of foaming liquid, poor compatibility of admixtures, etc. Safe and convenient, improve cementing quality, good compatibility

Active Publication Date: 2018-11-02
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of silicone defoamer is polysiloxane, which has the characteristics of strong defoaming effect, low surface tension, low volatility, non-toxic, non-polluting, physiological inertness, etc., but its antifoaming performance in cement slurry system is poor
The polyether defoamer can adjust its water solubility and oil solubility by adjusting the ratio of oxyethylene and oxypropylene and the molar mass, greatly reducing the surface tension of the foaming liquid, has good defoaming and foam suppression capabilities, and has high temperature resistance , Alkali resistance and inorganic salt characteristics, but the defoaming ability of the latex cement slurry system is poor, and it will affect the thickening and strength development of the cement slurry system
Non-silicon defoamers include organic compounds such as phosphate ester, mineral oil and isooctyl alcohol. The defoaming performance of mineral oil defoamers is not stable, and the defoaming effect on some special cement slurry systems is poor; The agent has a strong smell, which is corrosive and dangerous; isooctyl alcohol has a strong smell, strong irritation, and poor safety in use
[0005] To sum up, there are many deficiencies in the oil well cement defoamers currently used for cementing, such as poor foam suppression ability; some have poor compatibility with admixtures, and there are few cement slurry systems that can be applied; some are dangerous

Method used

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  • Silyl ether composite defoaming agent as well as preparation method and application thereof
  • Silyl ether composite defoaming agent as well as preparation method and application thereof
  • Silyl ether composite defoaming agent as well as preparation method and application thereof

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preparation example Construction

[0040] On the other hand, based on the same inventive concept, the embodiment of the present application provides a preparation method of the above-mentioned silicone ether composite defoamer, please refer to figure 1 ,include:

[0041] Step S110: adding polydimethylsiloxane and polyether to the reaction kettle, raising the temperature to 170-200° C., and continuously stirring for 1-2 hours to form a first mixed liquid;

[0042] In this step, the stirring speed is 70-90 rpm. Stir at 170-200°C for 1-2 hours to fully react polydimethylsiloxane and polyether to generate the active ingredient of the defoamer.

[0043] Step S120: adding hydrophobic silica to the first mixed solution, stirring to homogenize the materials to form a second mixed solution;

[0044] Step S130: Add a compound emulsifier, a stabilizer and water to the second mixed solution, lower the temperature to 60-80° C., stir and react at a constant temperature, and obtain a reaction product that is the silicon eth...

Embodiment 1

[0051] Add 15g of polydimethylsiloxane and 15g of polyether to the reaction kettle, raise the temperature to 180°C, stir at 80 rpm for 1.5 hours, add 3g of hydrophobic white carbon black, stir to homogenize the materials, and react Complete, then add 3g of complex emulsifier, 2g of stabilizer and 62g of water in sequence, lower the temperature to 70°C, stir at constant temperature, and react for 1.5 hours to obtain the silicone ether composite defoamer.

[0052] Among them, the viscosity of polydimethylsiloxane is 0.91 Pa·S; the polyether is glycerol polyoxyethylene polyoxypropylene ether, and the average molecular weight is 2500. The particle size of hydrophobic silica is 2-3μm, and the specific surface area is 190m 2 / g.

Embodiment 2

[0054] Add 20g of polydimethylsiloxane and 20g of polyether to the reaction kettle, raise the temperature to 170°C, stir at a speed of 90 rpm for 2 hours, add 4g of hydrophobic white carbon black, stir to homogenize the materials, and react Complete, then add 4g of composite emulsifier, 2g of stabilizer and 50g of water in sequence, cool down to 60°C, stir at constant temperature, and react for 2 hours to obtain the silicone ether composite defoamer.

[0055] Among them, the viscosity of polydimethylsiloxane is 0.82 Pa·S; the polyether is glycerol polyoxyethylene polyoxypropylene ether, and the average molecular weight is 1800. The particle size of hydrophobic silica is 2-3μm, and the specific surface area is 180m 2 / g.

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Abstract

The invention discloses a silyl ether composite defoaming agent as well as a preparation method and an application thereof, and belongs to the technical field of oilfield chemical industry. The composite defoaming agent is prepared from components in percentage by mass as follows: 15%-25% of polysiloxane, 15%-25% of polyether, 2%-5% of hydrophobic white carbon black, 2%-5% of a compound emulsifier, 1%-2% of a stabilizer and the balance of water. The preparation method comprises steps as follows: polydimethylsiloxane and polyether are added to a reaction kettle, the temperature is increased to170-200 DEG C, and the materials are continuously stirred for 1-2 h; hydrophobic white carbon black is added and stirred to be homogenized; the compound emulsifier, the stabilizer and water are added,the temperature is reduced to 60-80 DEG C, a stirring reaction is performed at constant temperature, and the silyl ether composite defoaming agent is obtained. The composite defoaming agent is used for defoaming and foam inhibition in a stirring process of well cementing slurry containing an admixture. The composite defoaming agent is high in defoaming and foam inhibition capacity, can be appliedto various cement slurry systems, and is good in compatibility with common admixtures, safe and environmentally friendly.

Description

technical field [0001] The invention relates to the field of oilfield chemical technology, in particular to a silicon ether composite defoamer and its preparation method and application. Background technique [0002] Foam is a dispersion system in which a large number of bubbles are dispersed in a liquid, the dispersed phase is gas, and the continuous phase is liquid. Since the relative density of the bubbles is less than that of the liquid, the bubbles in the liquid will rise to the liquid surface, forming a bubble aggregate separated by a liquid film composed of a small amount of liquid, that is, foam. When a surfactant is added to the solution system, a layer of surfactant molecules arranged in an orientation is adsorbed on the surface of the bubbles. When it reaches a certain concentration, a solid film is formed on the bubble wall, so that the bubbles are not easy to merge. The defoamer is to destroy and inhibit the formation of this film. [0003] During the cementin...

Claims

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Application Information

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IPC IPC(8): C04B24/42C09K8/467C04B103/50
CPCC04B40/0039C04B2103/50C09K8/467C04B24/42C04B24/32C04B14/022C04B14/104
Inventor 李洋李建华汤少兵王琼滕兆健卢海川高继超周雪
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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