Heatproof oil well cement fluid loss additive and preparation method thereof

A technology for oil well cement and fluid loss control agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of easy hydrolysis of amide groups, unsuitable 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: get 10 weight parts of 2-acrylamido-2-methyl-1-propanesulfonic acid and add 15 weight parts of deionized water, then add a weight fraction of 5% sodium hydroxide aqueous solution to neutralize to pH =3, then add 10 parts by weight of acrylamide, 0.1 parts by weight of complexing agent EDTA, and 0.01 parts by weight of chain transfer agent isopropanol, stir at a temperature of 30°C, and pass 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

[0020] Embodiment 2: get 50 weight parts of 2-acrylamido-2-methyl-1-propanesulfonic acid and add 30 weight parts of deionized water, then add a weight fraction of 8% sodium hydroxide aqueous solution to neutralize to pH =7, then add 10 parts by weight of acrylamide, 0.5 parts by weight of complexing agent EDTA, and 0.1 parts by weight of chain transfer agent isopropanol, stir at a temperature of 45 ° C, and pass 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

[0021] Embodiment 3: get 120 parts by weight of 2-acrylamido-2-methyl-1-propanesulfonic acid and add 50 parts by weight of deionized water, then add a 10% aqueous solution of sodium hydroxide to neutralize to pH =11, then add 10 parts by weight of acrylamide, the complexing agent EDTA of 1 part by weight, the chain transfer agent sodium benzoate of 1 part by weight, stir at a temperature of 60 ° C, and pass 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 belongs to a heat-resistant oil well cement fluid loss additive and a preparation method thereof. The invention is characterized in that the method adopts industrial raw materials of acrylamide and 2-acrylamide-2-methyl-1-AMPSA to carry out copolymerization with N-vinyl pyrrolidone; firstly 10-120 portions of 2-acrylamide-2-methyl-1-AMPSA and 15-50 portions of deionized water are added into a reactor with an agitator and a thermometer, agitated 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 to obtain the oil well cement fluid loss additive. The method has simple preparation. The prepared high-temperature resistant spacer fluid 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 spacer fluid keeps still for 15 hours at the temperature of 200 DEG C, and is cooled through flowing water after being taken out, without sedimentation.

Description

technical field [0001] The invention relates to a temperature-resistant oil well cement fluid loss reducer and a preparation method thereof, belonging to the technical field of polymer material preparation. Background technique [0002] With the continuous development of oil exploration technology and the gradual development of oil field exploitation to deep formations and offshore, higher requirements are put forward for the temperature resistance of oil well cement fluid loss reducer. At present, most fluid loss control products are water-soluble polymers and organic materials. Water-soluble polymers are mainly polyacrylamide and its copolymers. However, polyacrylamide has poor heat and salt resistance, not only not suitable for high temperature reservoirs, but also under low temperature reservoir conditions because of its reduced thickening ability and cannot be used normally. Therefore, the development of temperature-resistant polymers has become a hot topic in the dev...

Claims

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Application Information

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IPC IPC(8): C09K8/487C08F220/58
Inventor 宋春雷安会勇刘畅徐昆盛德鲲王丕新
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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