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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 of not controlling mud fluid loss, the dynamic-plastic ratio is not as high as that of MMH, and the starting pressure of mud pump is high, so as to achieve excellent fluid loss reduction ability and low apparent Viscosity, the effect of increasing ROP

Inactive Publication Date: 2003-01-01
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix 71.5Kg of powdered aluminum hydroxide, 40.0kg of powdered magnesium hydroxide, 5.0kg of powdered lithium hydroxide and 3.0kg of powdered beryllium hydroxide in a mixer, and set aside.

[0048]Under normal temperature conditions, 250kg of deionized water, 350kg of acrylamide, 180kg of acrylic acid, 50kg of acrylonitrile, 150kg of N,N-dimethyl-N-benzylallylammonium chloride were sequentially added to the reaction kettle, and fully stirred. 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 pH value of the system. Then the composite metal hydroxide prepared earlier is added. Fully stir the materials in the reaction kettle evenly, add 14.6 kg of ammonium persulfate aqueous solution (10%) and 14.6 kg of sodium bisulfite aqueous solution (10%), and instantaneous polymerization occurs within 5 minutes of vaporization and solvent re...

Embodiment 2

[0050] Add 0.60mol aluminum chloride (AlCl 3 66.7kg), 0.30mol magnesium chloride (MgCl 2 ·6H 2 O61.0kg), 0.06mol iron trichloride (FeCl 3 9.7kg) and 0.04mol nickel chloride (NiCl 2 ·6H 2 O 9.5 kg) was dissolved in 600 kg of water, and 266.3 kg of 40% sodium hydroxide aqueous solution was added dropwise under stirring, and stirred for 30 minutes. The solution containing a large amount of composite metal hydroxide gel was suction filtered under vacuum conditions, and then the gel cake was washed and suction filtered with 750 kg of water three times, and the gel cake had 87% water. stand-by.

[0051] Under normal temperature conditions, 100kg of deionized water, 290kg of acrylamide, 190kg of acrylic acid, 55kg of acrylonitrile, 150kg of N,N,N-trimethyl-N-butyl acrylate ammonium chloride, 50kg of acrylic acid were added to the reaction kettle in sequence Stir the sodium well. Neutralize with 54kg calcium hydroxide and 45kg sodium hydroxide to control the pH value equal to 6.5. At the ...

Embodiment 3

[0053] Mix 80 kg of powdered aluminum hydroxide and 40 kg of powdered magnesium hydroxide in the mixer, and set aside.

[0054] Add 250kg deionized water, 300kg acrylamide, 120kg acrylic acid, 50kg acrylonitrile, 150kg N,N-diethylallylammonium chloride and 100kg 2-acrylamide-2- Sodium methyl propane sulfonate, stir well. Neutralize with 60kg 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 the composite metal hydroxide prepared earlier is added. Stir the materials in the reaction kettle evenly, add 18.0 kg of ammonium persulfate aqueous solution (10%) and 18.0 kg of sodium bisulfite aqueous solution (10%), and instantaneous polymerization occurs within 5 minutes of vaporization and solvent removal. The product was dried and crushed at 100-110°C, and the viscosity of its 1% aqueous solution was 24.5 mPa.S. Comparative example 1:

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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 fluids and completion fluids. In more detail, the composite metal zwitterionic polymer of the present invention can be used as a viscosity-increasing and reducing agent in drilling fluids and completion fluids. Fluid loss agent or non-viscosity fluid loss reducer. Background technique [0002] In oil drilling operations, the downhole conditions of some of the applied oilfield blocks are extremely complicated, such as loose sand and conglomerate that is easy to collapse and easy to leak, mud shale with serious mud-making, salt-gypsum layer with serious pollution, and high temperature and high pressure at the same time. Wait. In the drilling and completion operations under the above-mentioned complex conditions, zwitterionic polymers and positively charged MMH have been widely used in the early 1990s, and they have their own shortcomings in their appli...

Claims

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Application Information

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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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