Composite metal zwitterion polymer and its prepn and use

A composite metal and amphoteric ion technology, applied in the direction of drilling equipment, etc., can solve the problems that the dynamic-plastic ratio is not as high as that of MMH, does not control mud filtration loss, and the starting pressure of mud pump is high, so as to achieve low apparent viscosity and inhibit dispersion slurry making performance, improve the effect of ROP

Inactive Publication Date: 2004-12-22
中国石油天然气股份有限公司勘探开发研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the weak anti-pollution ability of MMH, the rheology will deteriorate in medium salinity water quality, and the original excellent rheology of low apparent viscosity, low plastic viscosity and high dynamic plastic ratio will be basically lost. In addition, MMH does not have The ability to control mud filtration loss, poor compatibility with other conventional treatment agents
On the other hand, zwitterionic polymers are better in temperature resistance, anti-pollution, fluid loss reduction and viscosity increasing, but the dynamic plastic ratio in fresh water slurry is not as high as that of MMH. high pressure

Method used

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  • Composite metal zwitterion polymer and its prepn and use
  • Composite metal zwitterion polymer and its prepn and use
  • Composite metal zwitterion polymer and its prepn and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]Mix 71.5Kg powdered aluminum hydroxide, 40.0kg powdered magnesium hydroxide, 5.0kg powdered lithium hydroxide and 3.0kg powdered beryllium hydroxide in a mixer and set aside.

[0056] Add 250kg of deionized water, 350kg of acrylamide, 180kg of acrylic acid, 50kg of acrylonitrile, and 150kg of N,N-dimethyl-N-benzylallyl ammonium chloride into the reactor in turn at room temperature, and stir well. Neutralize with 45kg calcium hydroxide and 65kg potassium hydroxide, control the pH value to be equal to 6.5, and keep the system temperature not higher than 30°C during the process of adjusting the system pH value. Then add the previously prepared composite metal hydroxide. The materials in the reactor were fully stirred evenly, and 14.6 kg of ammonium persulfate aqueous solution (10%) and 14.6 kg of sodium bisulfite aqueous solution (10%) were added, and vaporization desolvation instant polymerization occurred within 5 minutes. The product is dried and pulverized at 100-110°C...

Embodiment 2

[0058] 0.60mol aluminum chloride (AlCl 3 66.7kg), 0.30mol magnesium chloride (MgCl 2 ·6H 2 O61.0kg), 0.06mol ferric chloride (FeCl 3 9.7kg) and 0.04mol nickel chloride (NiCl 2 ·6H 2 (9.5kg) was dissolved in 600kg of water, and 266.3kg of 40% aqueous sodium hydroxide solution was added dropwise under stirring, and stirred for 30 minutes. The solution containing a large amount of composite metal hydroxide gel is suction-filtered under vacuum conditions, and then the gel filter cake is washed and suction-filtered three times with 750 kg of water, and the gel filter cake has a water content of 87%. stand-by.

[0059] Add 100kg deionized water, 290kg acrylamide, 190kg acrylic acid, 55kg acrylonitrile, 150kg N,N,N-trimethyl-N-acrylate butyl ammonium chloride, 50kg propylene sulfonate to the reaction kettle in sequence sodium bicarbonate and stir well. Neutralize with 54kg of calcium hydroxide and 45kg of sodium hydroxide, and control the pH value to be equal to 6.5. At the ...

Embodiment 3

[0061] 80kg of powdery aluminum hydroxide and 40kg of powdery magnesium hydroxide were mixed uniformly in a mixer and set aside.

[0062] Add 250kg deionized water, 300kg acrylamide, 120kg acrylic acid, 50kg acrylonitrile, 150kg N,N-diethylallyl ammonium chloride and 100kg 2-acrylamide-2- Sodium methyl propane sulfonate, stir well. Neutralize with 60kg of calcium hydroxide, control the pH value to be equal to 6.5, and keep the system temperature not higher than 30°C during the process of adjusting the pH value of the system. Then add the previously prepared composite metal hydroxide. Stir the materials in the reactor evenly, add 18.0kg ammonium persulfate aqueous solution (10%) and 18.0kg sodium bisulfite aqueous solution (10%), and vaporization desolvation instant polymerization occurs within 5 minutes. The product is dried and pulverized at 100-110°C, and its 1% aqueous solution viscosity is 24.5mPa.S.

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Abstract

The present invention relates to composite metal zwitterions polymer and its preparation. They are used as treating agent for drilling fluid and well completion fluid. The composite metal zwitterions polymer is prepared through re-compounding cationic, anionic and non-ionic monomer and metal hydroxide in certain proportion and vaporizing and desolvating flash polymerization. The composite metal zwirrerions polymer has excellent filtration property, clay hydration dispersion inhibiting property, rheological property and pollution and temperature resistance in fresh water, salty water and saturated mud.

Description

field of invention [0001] The composite metal zwitterionic polymer of the present invention is a novel treatment agent for drilling fluid and well completion fluid. In more detail, the composite metal zwitterionic polymer of the present invention can be used as a viscosity-increasing and reducing Fluid loss additives or non-viscosifying fluid loss additives. Background technique [0002] In oil drilling operations, the downhole conditions of some oilfield blocks used are extremely complex, such as loose conglomerate that is prone to collapse and leakage, mud shale with serious slurry generation, heavily polluted salt-gypsum layer, and high temperature and high pressure at the same time Wait. In the above complex drilling and completion operations, in the early 1990s, zwitterionic polymers and positive gel MMH were widely used, but they were found to have their own shortcomings in the application. For example, when drilling into strong mud-making formations, it is difficult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/40C08F220/04
Inventor 郑远渭吴木希董贺明肖红章魏堃李辉
Owner 中国石油天然气股份有限公司勘探开发研究院
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