Liquid lightening agent and preparation and application thereof

Abstract

The invention discloses a liquid lightening agent as well as preparation and application thereof. The liquid lightening agent comprises water, hollow microspheres and a high-molecular polymer, wherein a weight ratio of the water to the hollow microspheres to the high-molecular polymer is (40-60): (26-56): (0.5-2). The lightening agent provided by the invention not only can play a role in reducing the density, but also is a lightening material which can be added in a liquid form. Liquid addition of lightening materials is realized, so flexible preparation of the low-density cement paste is realized, and convenience is provided for on-site preparation of the low-density cement paste. In addition, the lightening agent provided by the invention can be stably stored for a long time.

Description

technical field

[0001] This article relates to but not limited to the density adjustment of cement slurry, especially relates to but not limited to a liquid suspension alleviating agent for well cementing. Background technique

[0002] Cementing is a key link in the drilling process. It serves the purpose of supporting the casing and isolating the formation. When the fracture pressure of the formation is narrow, in order to prevent the formation from fracturing, low-density cement slurry is usually used for cementing. There are two commonly used low-density cement slurry methods: one is to use suspended materials such as soil slurry and water glass, and to achieve it by increasing the water-cement ratio of the cement slurry. The waiting setting strength is low, which cannot meet the needs of rapid drilling in the next step; another method is to add hollow low-density materials such as hollow microspheres, floating beads, and expanded perlite to reduce the density of cement s...

Examples

Embodiment 1

[0057] In this embodiment, the hollow microspheres are processed as follows:

[0058] The hollow microspheres were purchased from Sinosteel Ma'anshan Mining Institute New Material Technology Co., Ltd., model H6000;

[0059] 1) Treating the hollow microspheres in a solution with a pH value of 12 for 2 hours, neutralizing the alkaline substances on the surface of the hollow microspheres after treatment and drying;

[0060] 2) Add the mixture of ammonia, ethanol and water to the hollow microspheres treated in step 1) for 0.5h; the weight ratio of the hollow microspheres to the mixed solution is 2.2:15.6; the volume of ammonia, ethanol and water The ratio is 0.1:2:6;

[0061] 3) Mix the mixture obtained in step 2) with ethyl orthosilicate and treat for 4 hours, the mass ratio of ethyl orthosilicate to the mixed liquid obtained in step 2) is 0.93:12.4;

[0062] 4) The mixture in step 3) was separated from solid and liquid, washed with ethanol and water for several times, filtered...

Embodiment 2

[0070] In this embodiment, the hollow microspheres are processed as follows:

[0071] The hollow microspheres were purchased from Zhongke Huaxing New Material Co., Ltd., model D4000;

[0072] 1) Treating the hollow microspheres in a solution with a pH value of 11 for 3 hours, neutralizing the alkaline substances on the surface of the hollow microspheres after treatment and drying;

[0073] 2) adding the mixture of ammonia, ethanol and water to the hollow microspheres treated in step 1) for 0.5h; the weight ratio of the hollow microspheres to the mixed solution is 1.8:19.8; the volume of ammonia, ethanol and water The ratio is 0.05:4:6;

[0074] 3) Mix the mixture obtained in step 2) with ethyl orthosilicate, and treat for 4 hours, the mass ratio of ethyl orthosilicate to the mixture is 0.86:13.4;

[0075] 4) The mixture in step 3) is separated from solid and liquid, and the solid matter is calcined at 130° C. for 2 hours to obtain coated modified hollow microspheres.

[007...

technical field

[0001] This article relates to but not limited to the density adjustment of cement slurry, especially relates to but not limited to a liquid suspension alleviating agent for well cementing. Background technique

[0002] Cementing is a key link in the drilling process. It serves the purpose of supporting the casing and isolating the formation. When the fracture pressure of the formation is narrow, in order to prevent the formation from fracturing, low-density cement slurry is usually used for cementing. There are two commonly used low-density cement slurry methods: one is to use suspended materials such as soil slurry and water glass, and to achieve it by increasing the water-cement ratio of the cement slurry. The waiting setting strength is low, which cannot meet the needs of rapid drilling in the next step; another method is to add hollow low-density materials such as hollow microspheres, floating beads, and expanded perlite to reduce the density of cement s...

Examples

Embodiment 1

[0057] In this embodiment, the hollow microspheres are processed as follows:

[0058] The hollow microspheres were purchased from Sinosteel Ma'anshan Mining Institute New Material Technology Co., Ltd., model H6000;

[0059] 1) Treating the hollow microspheres in a solution with a pH value of 12 for 2 hours, neutralizing the alkaline substances on the surface of the hollow microspheres after treatment and drying;

[0060] 2) Add the mixture of ammonia, ethanol and water to the hollow microspheres treated in step 1) for 0.5h; the weight ratio of the hollow microspheres to the mixed solution is 2.2:15.6; the volume of ammonia, ethanol and water The ratio is 0.1:2:6;

[0061] 3) Mix the mixture obtained in step 2) with ethyl orthosilicate and treat for 4 hours, the mass ratio of ethyl orthosilicate to the mixed liquid obtained in step 2) is 0.93:12.4;

[0062] 4) The mixture in step 3) was separated from solid and liquid, washed with ethanol and water for several times, filtered...

Embodiment 2

[0070] In this embodiment, the hollow microspheres are processed as follows:

[0071] The hollow microspheres were purchased from Zhongke Huaxing New Material Co., Ltd., model D4000;

[0072] 1) Treating the hollow microspheres in a solution with a pH value of 11 for 3 hours, neutralizing the alkaline substances on the surface of the hollow microspheres after treatment and drying;

[0073] 2) adding the mixture of ammonia, ethanol and water to the hollow microspheres treated in step 1) for 0.5h; the weight ratio of the hollow microspheres to the mixed solution is 1.8:19.8; the volume of ammonia, ethanol and water The ratio is 0.05:4:6;

[0074] 3) Mix the mixture obtained in step 2) with ethyl orthosilicate, and treat for 4 hours, the mass ratio of ethyl orthosilicate to the mixture is 0.86:13.4;

[0075] 4) The mixture in step 3) is separated from solid and liquid, and the solid matter is calcined at 130° C. for 2 hours to obtain coated modified hollow microspheres.

[007...

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