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
CN102584083AInactive Publication Date: 2012-07-18XIANGFU NEW BUILDING MATERIAL HUNAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIANGFU NEW BUILDING MATERIAL HUNAN
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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