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Multi-element co-polymerization oil well cement fluid loss additive and preparation method thereof

An oil well cement and multi-copolymerization technology, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problems of easy hydrolysis of amide groups and is not suitable for high-temperature formations, etc., and achieves the effect of simple preparation process.

Active Publication Date: 2009-04-01
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the acrylamide in the product is prone to hydrolysis when the temperature is higher than 70°C, and the carboxyl group is extremely sensitive to salt, so this product is not suitable for high-temperature formations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: get 10 weight parts of 2-acrylamido-2-methyl-1-propanesulfonic acid, 1 weight part of acrylic acid, add 15 weight parts of deionized water, and then add a weight fraction of 5% hydroxide The sodium aqueous solution was neutralized to PH = 3, then 10 parts by weight of acrylamide, 0.1 part by weight of complexing agent EDTA, and 0.01 part by weight of chain transfer agent isopropanol were added, stirred at a temperature of 30°C, and passed through N 2 After 30 minutes, 2 parts by weight of N-vinylpyrrolidone and 0.01 parts by weight of potassium persulfate were added and reacted for 12 hours.

Embodiment 2

[0023] Embodiment 2: get 50 parts by weight of 2-acrylamide-2-methyl-1-propanesulfonic acid, 3 parts by weight of acrylic acid, add 30 parts by weight of deionized water, and then add 8% by weight of hydroxide The sodium aqueous solution was neutralized to PH=7, then 10 parts by weight of acrylamide, 0.5 parts by weight of complexing agent EDTA, and 0.1 part by weight of chain transfer agent isopropanol were added, stirred at a temperature of 45°C, and passed through N 2 After 30 minutes, 5 parts by weight of N-vinylpyrrolidone and 0.1 parts by weight of ammonium persulfate were added and reacted for 8 hours.

Embodiment 3

[0024] Embodiment 3: get 120 parts by weight of 2-acrylamido-2-methyl-1-propanesulfonic acid, 5 parts by weight of acrylic acid, add 50 parts by weight of deionized water, then add 10% by weight of hydrogen The sodium aqueous solution is neutralized to PH=11, then 10 parts by weight of acrylamide, 1 part by weight of complexing agent EDTA, and 1 part by weight of chain transfer agent sodium benzoate are added, stirred at a temperature of 60°C, and passed through N 2 After 30 minutes, 10 parts by weight of N-vinylpyrrolidone and 1 part by weight of ammonium persulfate were added and reacted for 4 hours.

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PUM

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Abstract

The invention relates to a multicomponent copolymerization oil well cement fluid loss additive and a preparation method thereof. The method comprises: 10-120 portions of 2-acrylamide-2-methyl-1-AMPSA, 1-5 portions of acrylic acid and 15-50 portions of deionized water are added, stirred and then added with sodium hydroxide aqueous solution with the mass fraction of 5-10 percent for neutralizing to pH equal to 3-11; then 10 portions of acrylamide, 0.1-1 portion of complexing agent EDTA and 0.01-1 portion of chain transfer agent are added, the chain transfer agent is isopropyl alcohol or sodium benzoate, the temperature is controlled between 30 DEG C and 60 DEG C and N2 is introduced for 30 minutes; 2-10 portions of N-vinyl pyrrolidone and 0.01-0.5 portion of initiator are added, the initiator is potassium persulfate or ammonium persulfate, and the reaction is carried out for 4-12 hours. The solution keeps still for 5 hours at the temperature of 180 DEG C, and is cooled through flowing water after being taken out, without sedimentation or water separating; and the water loss is zero at the temperature of 180 DEG C according to the standards of drilling fluid, and the water loss is 48ml according to the standards of cement.

Description

technical field [0001] The invention relates to a multi-component copolymerized oil well cement fluid loss reducer and a preparation method thereof, and belongs to the technical field of preparation of polymer materials. Background technique [0002] During well cementing construction, when the cement slurry flows through the permeable formation under pressure, it will percolate, causing the cement slurry phase to leak into the formation. This process is commonly known as "water loss". If the water loss is not controlled, the reduction of the liquid phase volume will increase the density of the cement slurry, and the thickening time and rheological properties will deviate from the original design requirements. The water loss of the cement slurry is too large, and it is easy to form a bridge blockage, making it difficult to realize the turbulent flow of the cement slurry and replace it. It may cause formation fluid channeling; a large amount of liquid flows into the formation...

Claims

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Application Information

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IPC IPC(8): C09K8/487C08F220/58
Inventor 宋春雷安会勇李羚露李文波张萍萍王丕新
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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