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Compound migration-preventing agent, migration-preventing cement slurry for well cementation and preparation method thereof

A technology for cementing cement slurry and anti-channeling agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of increased difficulty in preventing channeling, decreased cementing quality, poor physical properties, etc., and can improve the anti-channeling ability. , prevent damage, slow down the effect of damage

Active Publication Date: 2017-09-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under ultra-high temperature conditions, the temperature far exceeds the glass transition temperature of the latex, and the physical properties of the film formed by the latex on the two interfaces are poor. When the cement slurry "weightless", gas channeling cannot be effectively suppressed, and the cementing quality of the latex cement slurry system often not ideal
The statistical results of on-site cementing construction also show that when the temperature is higher than 130 °C, the cementing quality of the latex cement slurry system is significantly reduced, and the difficulty of channeling prevention increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Add hydrochloric acid to 250Kg of distilled water to make the pH of the solution 5.0, add 12Kg of sodium polyacrylate, add 145Kg of silicon dioxide with an average particle size of 10nm, 40Kg of silicon dioxide with an average particle size of 100nm, add 40Kg of average particle size 200nm silicon dioxide, 25Kg of silicon dioxide with an average particle size of 300nm, stirred and dispersed in a stirring disperser at a speed of 1400r / min for 2 hours, added 5Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 200, 10Kg ethylene glycol polyoxyethylene ether with a molecular weight of 400, and 5Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 1000. After the stirring disperser stirred at a speed of 1400r / min for 10min, 2Kg of carbonamide was added, and the stirring disperser was Stirring for 5 minutes at a rotating speed of 1400r / min can prepare a nano-silica anti-channeling emulsion with a solid content of 45% (wt%), the particle si...

Embodiment 2

[0097] Add hydrochloric acid to 260Kg of distilled water to make the pH value of the solution 4.0, add 8kg of sodium polyacrylate, add 80Kg of nano-silica with an average particle size of 10nm, 100kg of silicon dioxide with an average particle size of 100 nm, and 70Kg of Nano-silica with a particle size of 200 nanometers was stirred and dispersed in a stirring disperser at a speed of 1400r / min for 2 hours, and 5Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 200 and 5Kg of ethylene glycol with a molecular weight of 2000 were added. Alcohol polyoxyethylene ether, 1Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 4000. After stirring for 10 minutes at a speed of 1400r / min, add 6Kg of carbonamide, and stir for 5 minutes at a speed of 1400r / min. That is to say, a nano-silica anti-channeling emulsion with an effective solid content of 45% (wt%), an average particle diameter of 100nm and a viscosity of 0.053Pa·s was prepared. The density ...

Embodiment 3

[0105] Add hydrochloric acid to 265Kg of distilled water to make the pH of the solution 6.0, add 2kg of sodium polyacrylate, add 25Kg of nano-silica with an average particle size of 10nm, 100kg of silicon dioxide with an average particle size of 100 nm, and 100Kg of Nano-silica with a particle size of 200 nm and 25 Kg of nano-silica with an average particle size of 300 nm were stirred and dispersed at a speed of 1400 r / min in a stirring disperser for 2 hours, and 1 Kg of ethylene glycol polymer with a molecular weight of 400 was added. Oxyethylene ether, 2Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 6000, 2Kg of ethylene glycol polyoxyethylene ether with a molecular weight of 20000, after the stirring disperser stirred at a speed of 1400r / min for 10min, add 12Kg of carbonamide , after the stirring disperser was stirred for 2 hours at a speed of 1400r / min, the effective solid content was 45% (wt%) nano-silica anti-channeling emulsion, the particle size ...

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PUM

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Abstract

The invention relates to a compound migration-preventing agent for well-cementation cement slurry. The compound migration-preventing agent is characterized by comprising a nano silicon dioxide migration-preventing emulsion and latex for well cementation, particle size distribution of nano silicon dioxide particles in the nano silicon dioxide migration-preventing emulsion is within a range of 9-310nm, and average particle size is within a range of 80-120nm. The invention further relates to the cement slurry and a preparation method thereof.

Description

technical field [0001] The invention relates to an anti-channeling agent, in particular to an anti-channeling agent used in oil and gas well engineering. The invention also relates to a cement slurry and a preparation method thereof. Background technique [0002] At present, most of the anti-gas channeling cementing cement slurry is to add latex to the cement slurry to improve the anti-channeling performance of the cement slurry. Under ultra-high temperature conditions, the temperature far exceeds the glass transition temperature of the latex, and the physical properties of the film formed by the latex on the two interfaces are poor. When the cement slurry "weightless", gas channeling cannot be effectively suppressed, and the cementing quality of the latex cement slurry system Often less than ideal. The statistical results of on-site cementing construction also show that when the temperature is higher than 130 °C, the cementing quality of the latex cement slurry system is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/493C04B28/00
CPCC04B28/00C09K8/493C09K2208/10C04B2103/0068C04B18/14C04B2103/465C04B2103/22C04B2103/408C04B2103/50C04B22/06C04B24/20C04B24/04C04B24/30C04B24/40
Inventor 曾义金周仕明魏浩光杨红歧方春飞刘飞
Owner CHINA PETROLEUM & CHEM CORP
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