Method for preparing high belite cement retarder

A technology of cement retarder and belite, which is applied in the field of preparation of high belite cement retarder, can solve the problems of poor control of cement setting time, fast setting of high belite cement, and difficulty in smooth construction operations, etc. , to achieve the effect of good thickening curve shape, wide application temperature range and low cost

Inactive Publication Date: 2012-07-18
XIANGFU NEW BUILDING MATERIAL HUNAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When high belite cement is used in places that need to control the thickening time of cement, such as oil and gas well water injection operations, or other places that need to control the thickening time, the high belite cement made of anhydrite Condensation is too fast, it is difficult to smooth construction work
At present, the widely used cement retarder is used in high belite cement, and the setting time of cement is not easy to control, which also brings difficulties to construction operations

Method used

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  • Method for preparing high belite cement retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment includes the following steps:

[0019] (1) Prepare raw materials with the following weights: 55kg of 2-acrylamide-2-methylpropanesulfonic acid, 25kg of citric acid, 15kg of sodium chromate, and 5kg of biosurfactant Tween-20;

[0020] (2) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in 55kg of 30% ethanol aqueous solution at 50°C;

[0021] (3) Add citric acid first to the ethanol solution of 2-acrylamide-2-methylpropanesulfonic acid obtained in step (2), then add sodium chromate, stir evenly, and then keep warm at 75°C for 2.5 hours;

[0022] (4) Add biosurfactant Tween-20 to the solution obtained in step (3) at 40°C, stir and react at a constant temperature for 0.5 hours to obtain a high belite cement retarder.

[0023] In the high belite cement, respectively mix 0% (that is, not bad), 0.3%, 0.4%, 0.7% of the high belite cement retarder prepared in this embodiment, test its setting time, the test results are shown in Table 1.

Embodiment 2

[0025] This embodiment includes the following steps:

[0026] (1) Prepare raw materials with the following weights: 40kg of 2-acrylamide-2-methylpropanesulfonic acid, 30kg of citric acid, 20kg of sodium chromate, and 10kg of biosurfactant Tween-20;

[0027] (2) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in 66kg of 50% ethanol aqueous solution at 70°C;

[0028] (3) Add citric acid first to the ethanol solution of 2-acrylamide-2-methylpropanesulfonic acid obtained in step (2), then add sodium chromate, stir evenly, and then keep warm at 90°C for 2 hours;

[0029] (4) Add biosurfactant Tween-20 to the solution obtained in step (3) at 50°C, stir and react at a constant temperature for 1 hour to obtain a high belite cement retarder.

[0030] In the high belite cement, respectively mix 0% (that is, not bad), 0.3%, 0.4%, 0.7% of the high belite cement retarder prepared in this embodiment, test its setting time, the test results are shown in Table 1.

Embodiment 3

[0032] This embodiment includes the following steps:

[0033] (1) Prepare raw materials with the following weights: 60kg of 2-acrylamide-2-methylpropanesulfonic acid, 20kg of citric acid, 15kg of sodium chromate, and 5kg of biosurfactant Tween-20;

[0034] (2) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in 90kg of ethanol aqueous solution with a volume concentration of 60% at 60°C;

[0035] (3) Firstly add citric acid to the ethanol solution of 2-acrylamide-2-methylpropanesulfonic acid obtained in step (2), then add sodium chromate, stir evenly, and then keep warm at 80°C for 3 hours;

[0036] (4) Add the biosurfactant Tween-20 to the solution obtained in step (3) at 60°C, stir and react at a constant temperature for 40 minutes to obtain the high belite cement retarder.

[0037] In the high belite cement, respectively mix 0% (that is, not bad), 0.3%, 0.4%, 0.7% of the high belite cement retarder prepared in this embodiment, test its setting time, the test results are s...

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Abstract

A method for preparing a high belite cement retarder comprises the steps: (1) dosing 2-acrylamide-2-methyl-propyl sulfonate 40-60%, citric acid 20-30%, sodium chromate 10-20% and biosurfactant 5-10%; (2) dissolving the 2-acrylamide-2-methyl-propyl sulfonate in a ethanol water solution at the temperature of 50-70 DEG C; (3) adding the citric acid into the solution prepared in the step (2) and thenadding the sodium chromate to react in a heat preserving mode at the temperature of 75-90 DEG C for 2-3 hours; and (4) adding the biosurfactant into the solution prepared in the step (3) at the temperature of 40-60 DEG C to be stirred at the constant temperature and react for 0.5-1 hour to obtain the high belite cement retarder. The high belite cement retarder prepared by means of the method is small in adding amount required by cement, low in cost, wide in applied temperature range, stable in chemical properties and capable of improving rheological property of cement paste and quality of thecement.

Description

technical field [0001] The invention relates to a preparation method of a retarder, in particular to a preparation method of a high belite cement retarder. Background technique [0002] Cement retarder is usually used in the cement slurry used in cement operations. For example, in the cementing operation of oil and gas wells, the cement slurry is pumped into the well, and the cement slurry is replaced into the annular space between the casing and the wellbore by replacing the slurry. space to achieve the purpose of isolating oil, gas and water layers to protect the production layer and support the protective casing. The cement should have good pumpability before it is delivered to the required location. As the hydration reaction in cement proceeds, when the cohesion reaches a certain level, the cement will lose its fluidity and cannot be used for construction operations. Therefore, the thickening time of cement slurry is the key to control the cementing operation, ensure co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C09K8/42
Inventor 刘立文刘四海宁勇鲁纪鸣
Owner XIANGFU NEW BUILDING MATERIAL HUNAN
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