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Oil well cement dispersing agent and preparation method thereof

An initiator and selected technology, applied in the field of oilfield cementing, can solve the problems of difficulty in meeting the requirements of special cement slurry system, incompatibility of new admixtures, low temperature resistance, etc., achieving good pumpability, improving Flow properties, the effect of preventing agglomeration

Active Publication Date: 2022-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional sulfonated aldehyde and ketone dispersants are difficult to meet the slurry mixing requirements of special cement slurry systems or are incompatible with new admixtures in actual well cementing construction. The new generation of polycarboxylic acid dispersants The dispersant has the problem of low temperature resistance and is difficult to meet the high temperature and high pressure environment application requirements of the oil well cement industry. A cement dispersant and its preparation method are provided. The cement dispersant of the present invention is a boron-containing polymer, which is a kind of A new type of water-soluble polymer containing boric acid groups synthesized for oil well cement. The cement dispersant uses boric acid groups as anchor points, which can effectively prevent cement particles from agglomerating and improve the fluidity of cement slurry. The applicable temperature can reach 25-120°C; AMPS is used as the skeleton, which has the characteristics of high temperature and salt resistance

Method used

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  • Oil well cement dispersing agent and preparation method thereof
  • Oil well cement dispersing agent and preparation method thereof
  • Oil well cement dispersing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Weigh 1035g (5mol) of 2-acrylamide-2-methylpropanesulfonic acid, 444g (3mol) of 4-vinylbenzeneboronic acid, 144g (2mol) of acrylic acid and 2560g of deionized water into beaker A and mix well , to obtain a monomer mixture. Weigh 21g (0.2mol) of 3-mercaptopropionic acid, 9g (0.05mol) of ascorbic acid and 640g of deionized water into beaker B, and mix well to obtain the first mixture. Next, weigh 6g of hydrogen peroxide (concentration: 30%) (0.05mol) and 260g of deionized water into a four-neck flask equipped with a thermometer and a stirrer, heat to 65°C, keep the temperature constant and keep stirring. Subsequently, the monomer mixture and the first mixture were pumped into the four-necked flask at a constant speed by two flow pumps at the same time. After the addition was completed, the reaction was maintained at 65°C for 1 hour to obtain a boron-containing polymer 1 with a solid content of 32%. Determined by GPC to be 9.4×10 3 .

Embodiment 2

[0087] Weigh 145g (0.7mol) of 2-acrylamide-2-methylpropanesulfonic acid, 45g (0.3mol) of 4-vinylphenylboronic acid and 300g of deionized water into beaker A, and mix well to obtain a monomer mixture. Weigh 2.1g (0.02mol) of 3-mercaptopropionic acid, 0.9g (0.005mol) of ascorbic acid and 64g of deionized water into beaker B, and mix well to obtain the first mixture. Next, weigh 0.6g of hydrogen peroxide (concentration: 30%) (0.005mol) and 27g of deionized water into a four-neck flask equipped with a thermometer and a stirrer, heat to 65°C, keep the temperature constant and continue to stir. Subsequently, the first solution and the first mixture were pumped into the four-necked flask by two flow pumps simultaneously. After the addition was completed, the reaction was maintained at 65°C for 1 hour to obtain a boron-containing polymer 2 with a solid content of 33%. GPC determined to be 1.16×10 4 .

Embodiment 3

[0089] Weigh 62g (0.3mol) 2-acrylamide-2-methylpropanesulfonic acid, 74g (0.5mol) 4-vinylbenzeneboronic acid, 20g (0.2mol) N,N-dimethylacrylamide and 246g deionized Add water into beaker A and mix well to obtain a monomer mixture. Weigh 2.1 (0.02 mol) g 3-mercaptopropionic acid, 0.9 g (0.005 mol) g ascorbic acid (Vc) and 64 g deionized water into beaker B, and mix well to obtain the first mixture. Weigh 0.6g of hydrogen peroxide (concentration: 30%) (0.005mol) and 27g of deionized water into a four-neck flask equipped with a thermometer and a stirrer, heat to 65°C, keep the temperature constant and keep stirring. Subsequently, the monomer mixture and the first mixture were simultaneously pumped into the four-necked flask by two flow pumps. After the addition was completed, the reaction was maintained at 65°C for 1 hour to obtain a boron-containing polymer 3 with a solid content of 32%. GPC determined to be 8.3×10 3 .

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Abstract

The invention provides a boron-containing polymer, which comprises a structural unit as shown in a formula I, a structural unit as shown in a formula II, an optional structural unit as shown in a formula III and an optional structural unit as shown in a formula IV. The invention also provides a preparation method of the boron-containing polymer and application of the boron-containing polymer as an oil well cement dispersing agent. According to the invention, the boron-containing polymer uses a boric acid group as an anchoring point, can effectively prevent cement particles from agglomerating and improve the flowing property of cement paste, adopts the structure shown in the formula I as a framework, has the characteristics of high temperature resistance and salt resistance, has an excellent dispersion effect when being used as a cement dispersing agent, and is applicable at the temperature of 25-120 DEG C.

Description

technical field [0001] The invention relates to the technical field of oil field cementing, in particular to an oil well cement dispersant and a preparation method thereof. Background technique [0002] During the drilling process of oil and natural gas, it is necessary to run the casing into the specified well depth, and then pump cement slurry into the annular space between the casing and the wellbore, that is, the cementing operation, to balance the formation pressure, isolate the oil, gas and water layers and Support casing and so on. The pumped cement slurry needs to have good flow properties. However, in actual construction, especially in the cementing construction of high temperature, high pressure, and complex wells, it is often necessary to add retarders, dispersants, weighting agents, and lightening agents to the cement slurry. Admixtures or external admixtures such as admixtures, rubber materials, latex materials, etc., under a fixed water-cement ratio, these adm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F230/06C08F220/06C08F220/54C04B24/16C04B103/40
CPCC08F220/585C04B24/163C04B2103/408C08F230/065C08F220/06C08F220/54
Inventor 王牧苗霞周仕明刘建汪晓静
Owner CHINA PETROLEUM & CHEM CORP
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