Oil well cement high-temperature strength stabilizer and cement paste for well cementation, and preparation method of cement paste

A high-temperature strength and oil well cement technology, which is applied in the field of oil well cement admixtures for oil and gas well cementing operations, can solve the problems that it is difficult to ensure the development of long-term compressive strength, the long-term strength decline of cement stones, and cannot be effectively solved, so as to achieve guarantee Long-term sealing integrity, improving compactness, and overcoming the effect of not stabilizing existence

Active Publication Date: 2021-05-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Starting from the particle size, purity and dosage of the quartz sand material, they formed a multi-graded high-temperature strength stabilizer material, which can ensure the stable strength of cement stone at 200°C for 7 days, but it is difficult to guarantee the cement stone above 200°C long-term compressive strength development in
In other words, the problem of strength decline cannot be effectively solved, and the long-term strength decline of cement stones above 200 °C is still a common problem

Method used

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  • Oil well cement high-temperature strength stabilizer and cement paste for well cementation, and preparation method of cement paste
  • Oil well cement high-temperature strength stabilizer and cement paste for well cementation, and preparation method of cement paste
  • Oil well cement high-temperature strength stabilizer and cement paste for well cementation, and preparation method of cement paste

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preparation example Construction

[0027] Another aspect of the present invention provides a kind of preparation method of well cementing cement slurry, and described preparation method comprises the following steps:

[0028] Dry mix the above oil well cement high temperature strength stabilizer, suspension stabilizer, iron ore powder, dispersant and portland cement according to the mass ratio of 60~80:4~5.3:0~92.1:0~2.1:100, to obtain a solid mixture;

[0029] Subsequently, the fluid loss additive, retarder, and defoamer are added to water and mixed evenly to obtain a slurry mixture, wherein the fluid loss additive, retarder, defoamer, and water account for the Portland cement The mass percentages are 7.4% to 10.8%, 6.4% to 10.5%, 0.32% to 0.53% and 52.5% to 60%, respectively;

[0030]Finally, the solid mixture is mixed with the slurry mixture to obtain cement slurry for well cementing.

[0031] For example, the oil well cement high-temperature strength stabilizer, suspension stabilizer, iron ore powder, dis...

example 1

[0035] In this example, weigh 500g of grade G oil well cement, 300g of high temperature strength stabilizer, 20g of suspension temperature agent, 32g of fluid loss control agent, 24g of retarder, 1.6g of defoamer, and 262.4g of tap water. First dry mix the high temperature strength stabilizer, suspension stabilizer and cement evenly, then add the fluid loss reducer, retarder and defoamer into tap water and mix evenly, finally put the liquid material into the mixing cup, start the motor and keep Rotate at 4000r / min±200r / min, then add dry-mixed materials, cover the lid of the mixing cup after all the addition, and continue to stir at 12000r / min±500r / min for 35s to prepare cement slurry.

example 2

[0037] In this example, weigh 470g G grade oil well cement, 330g high temperature strength stabilizer, 20g suspension stabilizer, 32g fluid loss control agent, 24g retarder, 1.6g defoamer, and 262.4g tap water. First dry mix the high temperature strength stabilizer, suspension stabilizer and cement evenly, then add the fluid loss reducer, retarder and defoamer into tap water and mix evenly, finally put the liquid material into the mixing cup, start the motor and keep Rotate at 4000r / min±200r / min, then add dry-mixed materials, cover the lid of the mixing cup after all the addition, and continue to stir at 12000r / min±500r / min for 35s to prepare cement slurry.

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Abstract

The invention provides an oil well cement high-temperature strength stabilizer for well cementation, cement paste for well cementation and a preparation method the cement paste. The oil well cement high-temperature strength stabilizer comprises, by mass, 73-75% of a reinforcing agent, 22-24% of a crystalline phase stabilizing component and 2-4% of a pH conditioning agent, wherein the reinforcing agent comprises crystalline silicon dioxide and can undergo a hydration reaction with Portland cement under the condition that a temperature is higher than 200 DEG C so as to generate needle-shaped xonotlite and fibrous tobermorite crystals; the crystal phase stabilizing component is prepared from aluminum oxide and sepiolite according to a mass ratio of (3.0-4.0): (0.8-1.2), and can participate in the hydration reaction of the cement paste at a temperature higher than 200 DEG C to generate fibrous aluminum tobermorite crystals; and the pH conditioning agent is solid sodium silicate and has modulus of 1-2. According to the invention, later strength decline of a cement sheath can be effectively prevented, the compactness of set cement is improved, and the well cementation requirements of ultra-deep ultra-high-temperature wells are met.

Description

technical field [0001] The invention relates to the technical field of oil well cement admixtures for oil and gas well cementing operations, in particular to an oil well cement high temperature strength stabilizer for well cementing, cement slurry and a preparation method thereof. Background technique [0002] At present, the development of deep oil and gas resources has become a new growth point for the work of “increasing production and increasing efficiency” in oil fields. More and more wells are drilled in China with a depth of more than 8,000 m, and the bottom hole temperature of some wells exceeds 200 °C. When the temperature is higher than 110°C, the high-temperature strength decline performance of the cement stone is mainly improved by adding silica sand at home and abroad, but when the temperature exceeds 200°C, the long-term compressive strength decline of the conventional silicate plus silica sand cement stone Still very serious. Indoor research shows that the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B28/04C09K8/467
CPCC04B40/0039C04B28/04C09K8/467C04B2111/00724C04B2201/20C04B2201/50C04B22/06C04B22/00C04B12/04C04B24/163C04B14/02C04B24/22C04B24/003C04B2103/50Y02W30/91
Inventor 赵启阳严海兵黄伟尧艳唐炜
Owner BC P INC CHINA NAT PETROLEUM CORP
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