Latex cement defoaming agent and preparation method thereof

A defoamer and cement technology, applied in the field of oil well cementing, can solve the problems of few types of defoamer, poor defoaming effect, inability to meet drilling technology and other problems, and achieves no secondary pollution, strong and good foam suppression ability. Effects on storage stability

Inactive Publication Date: 2016-11-09
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are very few researches on latex cement defoamers in China. On the one hand, there are few types of defoamers involved in the research. On the other hand, the existing latex cement defoamers cannot meet the needs of drilling technology and have poor defoaming effects.

Method used

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  • Latex cement defoaming agent and preparation method thereof
  • Latex cement defoaming agent and preparation method thereof
  • Latex cement defoaming agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to mass percent, 15% simethicone, 5% oleic acid, 5% isooctyl alcohol, 8% tributyl phosphate, 4% Tween-60 and AEO (both volume ratios are 1: 1) Add the mixture and the remaining amount of water into a round-bottomed flask, stir, and raise the temperature to 80°C. After stirring for 1.5 hours, a white milky mixture is formed. Then add 4% microsilicon, continue stirring for 0.5 hours, and the product is obtained after cooling.

Embodiment 2

[0025] According to mass percent, 15% simethicone, 8% oleic acid, 8% isooctyl alcohol, 6% tributyl phosphate, 5% Tween-60 and AEO (both volume ratios are 1: 1) Add the mixture and the remaining amount of water into a round-bottomed flask and stir, and heat up to 80°C. After stirring for 1.5 hours, a white milky mixture is formed, and then add 3% carboxymethyl cellulose, continue stirring for 0.5 hours, and obtain after cooling product.

Embodiment 3

[0027] According to mass percent, 12% simethicone, 8% oleic acid, 10% isooctyl alcohol, 6% tributyl phosphate, 5% Tween-60 and AEO (both volume ratios are 1: 0.8) Add the mixture and water into a round bottom flask and stir, and heat up to 80°C. After stirring for 1.5 hours, a white milky mixture is formed. Then add 3% carboxymethyl cellulose, continue stirring for 0.5 hours, and obtain the product after cooling.

[0028] Defoamer effect evaluation:

[0029] Weigh 0.8g of analytically pure octylphenol polyoxyethylene ether, put it into 200ml of distilled water, and make a solution. Pour the prepared solution into the slurry cup of a constant speed stirrer, stir at 4000r / min±200r / min for 50s, then pour it into a 1000ml measuring cylinder within 5s, record the volume V of the solution 1 (ml) (including foam).

[0030] Weigh 0.8 g of analytically pure octylphenol polyoxyethylene ether, weigh the product in the above examples, put it into 200 ml of distilled water at a temperatu...

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Abstract

The invention discloses a latex cement defoaming agent and a preparation method thereof. The latex cement defoaming agent is prepared from the following components by mass percentage: 10-20% of dimethicone, 5-10% of oleic acid, 5-10% of isooctyl alcohol, 5-10% of tributyl phosphate, 3-6% of a suspension stabilizer, 4-8% of a composite emulsifier and the balance water. The composite emulsifier is a mixture of ester and ether, and after mixing, the theoretical HLB value of the emulsifier is 12.0-14.0. The preparation method of the latex cement defoaming agent consists of: firstly mixing the raw materials except the suspension stabilizer at 70-80DEG C, then adding the suspension stabilizer, further conducting constant temperature stirring for 10-60min, and performing discharging under stirring, thus obtaining the product. The latex cement defoaming agent does not undergo chemical reaction with other admixtures, can significantly increase the compressive strength of conventional density cement stones and low density cement stones, and also can increase the fluidity of cement slurry.

Description

technical field [0001] The invention belongs to the field of oil well cementing, in particular to a latex cement defoamer and a preparation method thereof. Background technique [0002] Latex has good properties such as controlling water loss, preventing gas channeling, cementation, corrosion resistance, and improving the plastic deformation ability of cement stone, and has been widely used in complex well cementing operations. However, latex cement slurry will produce a large number of air bubbles under the combined action of high-speed stirring and admixtures. Such air bubbles have high viscosity and are easy to stay inside the slurry, which is difficult to eliminate with ordinary defoamers. Because the latex contains a large amount of surfactant, air bubbles are formed in the cement slurry and exist stably. The actual density of the cement slurry is much smaller than the theoretical density, and it will have a greater impact on the compressive strength of the cement stone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/50
CPCC04B40/0039C04B2103/50C04B24/42C04B24/04C04B24/02C04B24/003C04B24/32C04B18/146C04B24/383
Inventor 于倩倩齐奔孙勤亮刘文明高雪晴杜滨
Owner CNPC BOHAI DRILLING ENG
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