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Salt-responsive high-temperature-resistant zwitterionic polymer filtrate reducer and preparation method and application thereof

A zwitterionic and fluid loss additive technology, which is applied in the field of drilling fluid fluid loss additives and salt-responsive anti-high temperature zwitterionic polymer fluid loss additives. It can solve the problems of poor salt resistance and fluid loss additives Molecular chain failure, it is difficult for drilling fluid to stabilize the wellbore, balance formation pressure to carry cuttings and lubricate drilling tools, etc., to achieve the effects of avoiding drilling fluid viscosity drop, reducing fluid loss, good viscoelasticity and shear dilution

Active Publication Date: 2020-12-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the shortcomings of existing fluid loss control agents: (1) Traditional fluid loss control agents have poor salt resistance, making it difficult for drilling fluid to maintain a stable borehole wall, balance formation pressure, carry cuttings and lubricate drilling tools; (2) ) under high temperature conditions, the molecular chain of the fluid loss agent will be thermally degraded and become invalid

Method used

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  • Salt-responsive high-temperature-resistant zwitterionic polymer filtrate reducer and preparation method and application thereof
  • Salt-responsive high-temperature-resistant zwitterionic polymer filtrate reducer and preparation method and application thereof
  • Salt-responsive high-temperature-resistant zwitterionic polymer filtrate reducer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A salt-responsive anti-high temperature zwitterionic polymer fluid loss reducer, prepared from the following raw materials in parts by mass:

[0048] N,N-dimethylacrylamide 16.4g, methacryloxyethyltrimethylammonium chloride 4.3g, 2-acrylamide-2-methylpropanesulfonic acid 4.3g, nanometer silicon dioxide (average particle size Diameter is 15nm) 6g, silane modifier (vinyl trichlorosilane) 1.2g, initiator ammonium persulfate / sodium bisulfite (mass ratio of ammonium persulfate and sodium bisulfite is 1:1) 0.375g.

[0049] The preparation method of the above-mentioned salt-responsive high temperature resistant zwitterionic polymer fluid loss reducer is as follows:

[0050] (1) Fully disperse 6g of nano-silica in 500mL of ethanol, adjust the pH to 4 with 20% acetic acid aqueous solution; after ultrasonication for 30min, add 1.2g of silane coupling agent, and condense and reflux at a water bath temperature of 70°C 2h; then centrifuge at 10000r / min for 10min, remove the lower l...

Embodiment 2

[0059] A salt-responsive anti-high temperature zwitterionic polymer fluid loss reducer, prepared from the following raw materials in parts by mass:

[0060] N,N-dimethylacrylamide 10.44g, methacryloxyethyltrimethylammonium chloride 7.28g, 2-acrylamide-2-methylpropanesulfonic acid 7.28g, nanometer silicon dioxide (average particle size Diameter is 15nm) 6g, silane modifier (vinyl trichlorosilane) 1.2g, initiator ammonium persulfate / sodium bisulfite (mass ratio of ammonium persulfate and sodium bisulfite is 1:1) 0.375g.

[0061] The preparation method of the above-mentioned salt-responsive high temperature resistant zwitterionic polymer fluid loss reducer is as follows:

[0062](1) Fully disperse 6g of nano-silica in 500mL of ethanol, adjust the pH to 4 with 20% acetic acid aqueous solution; after ultrasonication for 30min, add 1.2g of silane coupling agent, and condense and reflux at a water bath temperature of 70°C 2h; then centrifuge at 10000r / min for 10min, remove the lower...

Embodiment 3

[0065] A salt-responsive anti-high temperature zwitterionic polymer fluid loss reducer, prepared from the following raw materials in parts by mass:

[0066] N,N-dimethylacrylamide 6.06g, methacryloxyethyltrimethylammonium chloride 9.47g, 2-acrylamide-2-methylpropanesulfonic acid 9.47g, nanometer silicon dioxide (average particle size Diameter is 15nm) 6g, silane modifier (vinyl trichlorosilane) 1.2g, initiator ammonium persulfate / sodium bisulfite (mass ratio of ammonium persulfate and sodium bisulfite is 1:1) 0.375g.

[0067] The preparation method of the above-mentioned salt-responsive high temperature resistant zwitterionic polymer fluid loss reducer is as follows:

[0068] (1) Fully disperse 6g of nano-silica in 500mL of ethanol, adjust the pH to 4 with 20% acetic acid aqueous solution; after ultrasonication for 30min, add 1.2g of silane coupling agent, and condense and reflux at a water bath temperature of 70°C 2h; then centrifuge at 10000r / min for 10min, remove the lower...

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Abstract

The invention provides a salt-responsive high-temperature-resistant zwitterionic polymer filtrate reducer and a preparation method and application thereof. The filtrate reducer is prepared from the following raw materials in parts by mass: 2 to 40 parts of N, N-dimethylacrylamide, 2 to 20 parts of methacryloxyethyl trimethyl ammonium chloride, 2 to 20 parts of 2-acrylamide-2-methylpropanesulfonicacid, 4 to 8 parts of nano oxide, 1.0 to 1.5 parts of silane modifier and 0.3 to 0.4 part of an initiator. The salt-responsive zwitterionic polymer provided by the invention has a special polyelectrolyte resistance effect and positive response to salt, essentially realizes conversion from salt resistance to salt response, and is essentially compatible with salt, the obtained filtrate reducer has excellent salt resistance, temperature resistance and filtrate loss reduction performance, and also has shear dilutability.

Description

technical field [0001] The invention relates to a salt-responsive high-temperature resistant zwitterionic polymer fluid loss control agent and a preparation method and application thereof, belonging to the drilling fluid fluid loss control technology in the field of petroleum exploration and development. Background technique [0002] With the gradual depletion of conventional oil and gas resources, unconventional oil and gas resources such as heavy oil, oil sands, shale oil, shale gas, and coalbed methane have increasingly become development hotspots. my country's deep oil and gas resources are widely distributed and have large reserves, which will become the main backup energy to alleviate the contradiction between my country's energy supply and demand. my country's deep reservoirs (Tarim, Sichuan, Bohai Bay, etc.) generally have a depth of more than 6000m, the deepest is nearly 9000m, and the bottom hole temperature is 180-260°C. Ultra-deep wells have the characteristics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F292/00C08F220/54C08F220/34C08F220/58
CPCC09K8/035C08F292/00C08F220/54C08F220/34C08F220/585
Inventor 孙金声常晓峰吕开河刘敬平黄贤斌王金堂白英睿金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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