High-temperature-resistant dispersed fluid loss agent for oil well cement and preparation method thereof

A fluid loss reducing agent and oil well cement technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as high cement slurry consistency

Inactive Publication Date: 2011-09-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The fluid loss reducer synthesized by this method can reduce the water loss of cement slurry while improving the rheological properties of the cement slurry, and solve the problem of high cement slurry consistency

Method used

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  • High-temperature-resistant dispersed fluid loss agent for oil well cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 illustrates the preparation method of high temperature resistant dispersed oil well cement fluid loss reducer

[0019]Weigh 61.4 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 18.3 parts of N, N'-dimethylacrylamide (DMAA), 13.07 parts of acrylamide (AM), maleic anhydride (MA ) 7.23 copies. Dissolve in 308 parts of deionized water, add an appropriate amount of sodium hydroxide solution, and adjust the pH value to 7. Add the solution into the three-necked flask, put the three-necked flask into a constant temperature water bath at 40°C, start stirring, and pass nitrogen into the three-necked flask to remove oxygen. After the temperature of the aqueous solution in the three-necked flask reaches 40°C, add 4 parts of The mass concentration of ammonium sulfate and sodium bisulfite is 10% of the mixed solution to initiate the reaction, and the reaction lasts for 5 hours to prepare a tetrapolymer solution, which is dried and pulverized to obtain a dispe...

Embodiment 2

[0020] Example 2, Evaluation of the fluid loss reducing performance of the oil well cement fluid loss reducing agent of the present invention

[0021] Add a certain mass percentage (based on the cement quality) of powder sample 1 in Shengwei Oil Well G grade cement, prepare cement slurry with a water-cement ratio of 0.44 according to the GB10238-88 standard, and then press the People's Republic of China Petroleum and Natural Gas Industry Standard SY / T 5960-94 "Evaluation method of oil well cement fluid loss reducer" measures the water loss of sample 1, and evaluates the water loss reducer performance of sample 1.

[0022] The water loss reduction effect of sample 1 on oil well cement was evaluated according to the above method, and the results are shown in Table 1. Experimental results show that the fluid loss reducing agent for oil well cement of the present invention not only has good fluid loss reducing performance in fresh water solutions within the range of 60°C to 150°C...

Embodiment 3

[0025] Embodiment 3, the dispersibility evaluation of the oil well cement fluid loss reducing agent of the present invention

[0026] Add a certain mass percentage (based on the cement mass) of powder sample 1 to the G-grade cement of Shengwei Oil Well, prepare cement slurry with a water-cement ratio of 0.44 according to the GB10238-88 standard, and according to the Petroleum and Natural Gas Industry Standard SY / T5546 of the People's Republic of China -92 "Test Method for Application Properties of Oil Well Cement" Determination of the rheological properties of the cement slurry added to Sample 1.

[0027] The effect of sample 1 on the rheological properties of cement slurry was evaluated according to the above method, and the test results are shown in Table 2. The experimental results show that the consistency coefficient of the cement slurry added with sample 1 is small. Although the consistency coefficient increases with the increase of the amount of sample 1, the cement slu...

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Abstract

The invention provides a high-temperature-resistant dispersed fluid loss agent for oil well cement and a preparation method thereof. The fluid loss agent prepared with the method is used for reducing a fluid loss of cement paste in oil and natural gas well drilling and cementing processes. The fluid loss agent prepared with the method is a quadripolymer; comonomers are 2-acrylamide-2-methyl propanesulfonic acid (AMPS), N,N'-dimethylacrylamide (DMAA), acrylamide (AM), and maleic anhydride (MA); and an initiator is a mixed solution of ammonium persulfate and sodium hydrosulfite. The fluid loss agent provided by the invention has good capacities of controlling fluid loss and improving the rheologic property of the cement paste, and has good temperature-resistant and salt-resistant capabilityand wide application range.

Description

technical field [0001] The invention relates to a dispersed fluid loss reducer for oil field cementing and a preparation method thereof, belonging to the fields of oil field chemistry and oil gas well cementing. The fluid loss reducing agent prepared by the method is used for reducing the fluid loss of cement slurry in the cementing process of oil and gas wells. Background technique [0002] After oil and gas well drilling is completed, it is necessary to run casing and pump cement slurry to seal the annular space between the casing and the formation. Typically, the cement slurry is pumped downhole through the casing and back up the annulus. Due to the complex formation conditions and harsh downhole conditions, the free water in the cement slurry will filter out from the cement slurry and enter the formation under the action of the pressure difference during cementing. This process is usually called the loss of cement slurry. water. If the dehydration of the cement slurry...

Claims

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Application Information

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IPC IPC(8): C09K8/487
Inventor 步玉环郭胜来王成文郭辛阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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