High-temperature-resistant cement paste system for ultradeep wells

A technology for high temperature resistance and cement slurry, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as failure to meet cementing requirements and poor cement slurry performance, and achieve convenient preparation, long thickening time, and solution The effect of unstable performance

Inactive Publication Date: 2017-09-15
四川宏升石油技术开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the cement slurry has poor performance at high temperature and cannot meet the cementing requirements. The purpose is to provide a high temperature resistant cement slurry system for ultra-deep wells to solve the problem of poor performance of cement slurry at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-temperature resistant cement slurry system for ultra-deep wells of the present invention comprises the following components in parts by weight: 100 parts of cement, 6-18 parts of high-temperature fluid loss reducer, 25-40 parts of silica sand, 6-15 parts of high-temperature retarder, 3-5 parts of high-temperature stabilizer, 0.4-2 parts of dispersant, the high-temperature water loss reducing agent adopts a copolymer water loss reducing agent with a maximum temperature resistance of 180°C-230°C, and the high-temperature retarder adopts the highest temperature-resistant It is a set retarder at 180 DEG C-230 DEG C, and also includes a defoamer in parts by weight of 0.1-0.3 parts.

[0019] In the present invention, an admixture with high temperature resistance is added to the cement slurry, and the cement slurry hydrates quickly at high temperature, the slurry is unstable, and the water loss is large; therefore, the present invention adds a fluid loss reducer with hig...

Embodiment 2

[0021] Based on the above examples, the high temperature fluid loss reducing agent includes the following components: 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide, vinylpyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid The mass ratio of acid: acrylic acid: acrylamide: vinylpyrrolidone is 21:9:15:8. The sulfonic acid group in 2-acrylamide-2-methylpropanesulfonic acid has the performance of high temperature and salt resistance, 2-propene Amide-2-methylpropanesulfonic acid is a monomer that is widely used as a fluid loss reducer. The carboxyl group as an adsorption group has a good effect of reducing water loss. Vinylpyrrolidone can inhibit the hydrolysis of the amide group and improve the resistance of the polymer. Salt temperature resistance; the fluid loss reducer prepared by 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide, and vinylpyrrolidone can control the water loss below 50ml, and can withstand a maximum temperature of 180°C...

Embodiment 3

[0023] Based on the above examples, the high temperature retarder comprises the following components: 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, itaconic acid, 2-acrylamide-2-methylpropanesulfonic acid: acrylamide: The mass ratio of itaconic acid is: 7:7::3. Sulfonic acid group in 2-acrylamide-2-methylpropanesulfonic acid has anti-high temperature and salt resistance performance, and carboxyl group has slow-setting effect, and the present invention adopts itaconic acid Provides carboxyl groups, itaconic acid is a dibasic acid, which has a good retarding effect. Based on the components and proportions of the present invention, the thickening time of the conventional density cement slurry is 450 minutes at 180°C; and the thickening time of the conventional density cement slurry is 420 minutes at 230°C.

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Abstract

The invention discloses a high-temperature-resistant cement paste system for ultradeep wells. The high-temperature-resistant cement paste system for ultradeep wells comprises the following components in parts by weight: 100 parts of cement, 6-18 parts of high-temperature water-loss control agent, 25-40 parts of silica sand, 6-15 parts of high-temperature retarder, 3-5 parts of high-temperature stabilizer and 0.4-2 parts of dispersant. The high-temperature water-loss control agent adopts a copolymer water-loss control agent of which the maximum temperature resistance is 180-230 DEG C; and the high-temperature retarder adopts a retarder of which the maximum temperature resistance is 180-230 DEG C. The high-temperature-resistant admixtures are added into the cement paste, thereby solving the problem of unstable properties of the cement paste at high temperature.

Description

technical field [0001] The invention relates to a high temperature resistant cement slurry, in particular to a high temperature resistant cement slurry system for ultra-deep wells. Background technique [0002] Cementing is an important link in oil well construction. The quality of cementing directly affects the quality of the well's continuous drilling and subsequent completion, oil production, workover and other operations. The cementing operation is divided into casing and cement injection. Cement slurry is used to fill the annular space between casing and borehole, and its performance directly affects the quality of cementing. [0003] Since the depth of the deep exploration well is more than 5500m, the temperature at the bottom of the well will reach 220-240°C, and the circulation temperature at the bottom of the well will reach 170-180°C. In terms of high temperature environment. In a high temperature environment, the properties of the cement slurry become unstable,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/487
CPCC04B28/00C04B2111/00724C09K8/487C04B14/06C04B2103/22C04B2103/408C04B2103/50C04B24/16C04B24/04C04B24/121C04B24/128
Inventor 徐峰
Owner 四川宏升石油技术开发有限责任公司
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