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Oil well cement dispersant and preparation method thereof

A technology of oil well cement and dispersant, which is applied in the field of cement dispersant and its preparation, which can solve the problems of poor cement adaptability, low service temperature, and intolerance to salt, and achieve a wide range of applicable temperature, improved fluidity, and salt tolerance. high performance effect

Active Publication Date: 2013-06-12
天津科力奥尔工程材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, aldehyde and ketone dispersants have good dispersibility to oil well cement, but there are some defects in field application: high toxicity due to large powder dust, intolerance to salt, poor adaptability to cement, etc.; lignin sulfonate Salt and polynaphthalene sulfonate are currently the most common dispersants for oil well cement, but these substances have a strong retarding effect on cement, and the use temperature is low, and they are not resistant to salt

Method used

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  • Oil well cement dispersant and preparation method thereof
  • Oil well cement dispersant and preparation method thereof
  • Oil well cement dispersant and preparation method thereof

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preparation example Construction

[0026] The preparation method of the described oil well cement dispersant comprises the following steps: adding alkenyl sulfonic acid, alkenyl amide, alkenyl carboxylic acid and alkenyl acid anhydride into a reaction kettle equipped with a solvent, adjusting the pH with alkali, and adjusting the reaction kettle Heating, adding an initiator, reacting for a period of time, terminating the reaction to obtain a liquid dispersant, drying and pulverizing the liquid dispersant to obtain a powdery solid dispersant.

[0027] Described solvent is water, and reactant weight accounts for the 15-25% of forming solution gross weight; Described polymerization initiator is a kind of in ammonium persulfate, potassium persulfate or benzoyl peroxide, and initiator addition is reaction 0.09-1% of the weight of the object.

[0028] The termination reaction is achieved by adding a terminator, sodium bisulfite, in an amount of 0.5-1.5% of the reactant weight.

[0029] The polymerization reaction te...

Embodiment 1

[0032] Take 150g of 2-acrylamido-2-methylpropanesulfonic acid, 65g of acrylamide, 5g of acrylic acid, 10g of maleic anhydride, and 800g of water, start stirring, add the four monomers into the water in turn, stir well and then add A certain amount of sodium hydroxide is used to adjust the pH of the solution to 6.0, heat while stirring, add 15g of ammonium persulfate solution with a mass concentration of 3% at a temperature of 75°C, continue to heat up to 84°C and then keep the temperature for 100 minutes to carry out polymer reaction , then add mass concentration and be 5% sodium bisulfite solution 35g, continue to stir for 30 minutes, reaction finishes, obtains pale yellow liquid dispersant, obtains solid powdery dispersant product after drying and pulverizing.

Embodiment 2

[0034] Take 150g of 2-acrylamido-2-methylpropanesulfonic acid, 68g of N,N-dimethylacrylamide, 5g of methacrylic acid, 20g of maleic anhydride, and 800g of water, and adjust the pH of the solution to 6.5. When the temperature is 70°C, 20 g of ammonium persulfate solution with a mass concentration of 3% is added.

[0035] Operate according to the method described in Example 1 to obtain the dispersant of the present invention.

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Abstract

The invention discloses an oil well cement dispersant and a preparation method thereof. It is a copolymer produced by the polymerization reaction of alkenyl sulfonic acid, alkenyl amide, alkenyl carboxylic acid and alkenyl acid anhydride. The mass fraction compositions of the four components are respectively For: alkenyl sulfonic acid 60-80%, alkenyl amide 15-35%, alkenyl carboxylic acid 1-5% and alkenyl anhydride 1-15%. The oil well cement dispersant of the invention has excellent dispersibility to oil well cement, a service temperature up to 180°C, good salt resistance, no retarding side effect and good compatibility with other oil well cement admixtures.

Description

technical field [0001] The invention relates to a cement dispersant and a preparation method thereof, in particular to an oil well cement dispersant and a preparation method thereof. Background technique [0002] Oil well cement slurry is a high-concentration suspension system in which water is the continuous phase and cement particles are the dispersed phase. Solid content (mass fraction) up to 70%. Both the flocculent structure and larger particle aggregates in the cement slurry system increase the viscosity of the cement slurry and deteriorate the fluidity. When sealing the annulus between the well wall and the casing, cement slurry is generally pumped into the casing, and then returned from the annulus, which requires good rheological properties of the cement slurry. By adding a dispersant to the cement, the flocculation structure and particle aggregates can be destroyed, or even broken into pieces, releasing the wrapped water, reducing the effective volume of the disp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/16
CPCC04B24/2688
Inventor 刘中华
Owner 天津科力奥尔工程材料技术有限公司
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