CN-122012049-A - Composite suspension stabilizer for well cementation and preparation method thereof

Abstract

The invention relates to a suspension stabilizer for composite well cementation and a preparation method thereof, wherein the suspension stabilizer comprises biological rubber powder, water, a hydration promoter and a solvent, the hydration promoter is used for promoting the affinity of the biological rubber powder to the water, the solvent is preferentially used as an initial swelling medium of the biological rubber powder and is used for promoting the uniform dispersion of the biological rubber powder in a system, meanwhile, the biological rubber powder is swelled to a half-swelling state, and a space is reserved for the subsequent swelling reaction of the biological rubber powder and the water.

Inventors

• LIU HAO
• CHEN DEBAO
• JIANG TAO
• LIU XIN
• HOU LIWEI
• WANG GUANGLEI
• BI HONGJING
• YANG XIUTIAN

Assignees

• 大庆钻探工程有限公司
• 中国石油天然气集团有限公司

Dates

Publication Date

20260512

Application Date

20251128

Claims (10)

1. 1. The composite suspension stabilizer for well cementation is characterized by comprising the following components: The bio-gelatin powder comprises bio-gelatin powder, water, a hydration promoter and a solvent, wherein the hydration promoter is used for promoting the affinity of the bio-gelatin powder to the water, the solvent is used as an initial swelling medium of the bio-gelatin powder in preference to the water, is used for promoting the bio-gelatin powder to be uniformly dispersed in a system, and simultaneously swells the bio-gelatin powder to a half-swelling state, so that a space is reserved for the subsequent swelling reaction of the bio-gelatin powder with the water.
2. 2. The suspension stabilizer for composite well cementation according to claim 1, wherein the contents of the components in percentage by weight are as follows: 2-6% of biological rubber powder, 7-15% of hydration promoter, 16-25% of solvent and 55-70% of deionized water.
3. 3. The composite suspension stabilizer for well cementation, as set forth in claim 1 or 2, characterized in that the biological gum powder is one or more of xanthan gum, temperature wheel gum and diutan.
4. 4. The composite type suspension stabilizer for well cementation according to claim 3, wherein the composition and the content of the biological gum powder are, by mass, 10% -30% of xanthan gum, 20% -30% of hotwheel gum and 40% -60% of diutan.
5. 5. A composite suspension stabilizer for well cementation according to claim 3, wherein: The hydration promoter is one or more of fatty alcohol polyoxyethylene ether, coconut diethanol amine, alkylphenol polyoxyethylene ether and polyoxyethylene sorbitan monooleate.
6. 6. The suspension stabilizer for composite well cementation according to claim 5, wherein the composition and content of the hydration promoter are, in mass percent: 30% -60% of fatty alcohol polyoxyethylene ether, 10% -20% of coconut diethanol amine, 20% -30% of alkylphenol polyoxyethylene ether and 10% -20% of polyoxyethylene sorbitan monooleate.
7. 7. The suspension stabilizer for composite well cementation according to claim 5, wherein: the solvent is one or more of DMF, ethanol, isopropanol and ethylene glycol monobutyl ether.
8. 8. The suspension stabilizer for composite well cementation according to claim 7, wherein the composition and content of the solvent are, in mass percent: 10% -20% of DMF, 10% -20% of ethanol, 20% -30% of isopropanol and 50% -60% of ethylene glycol monobutyl ether.
9. 9. A method of preparing a suspension stabilizer for composite well cementation as claimed in any one of claims 1 to 8, comprising: completely dispersing the biological rubber powder in a solvent to form a first solution; Completely dispersing the hydration promoter in water to form a second solution; and (3) uniformly stirring the first solution and the second solution, and stirring for 0.5-1.5h at the temperature of 40-60 ℃ to obtain the composite suspension stabilizer for well cementation.
10. 10. The method for preparing the suspension stabilizer for composite well cementation according to claim 9, wherein the method comprises the following steps: When the hydration promoter is dispersed in water, an antifoaming agent is added.

Description

Composite suspension stabilizer for well cementation and preparation method thereof Technical Field The invention relates to the technical field of cementing pad additives in drilling engineering, in particular to a suspension stabilizer for composite cementing and a preparation method thereof. Background The existing suspension stabilizer for the cementing pad fluid is mostly composed of biological rubber powder, high molecular polymer, clay and the like, the composition can support the weighting material and effectively improve pad fluid isolation, and the high-temperature isolation liquid suspension stabilizer for the cementing is disclosed in CN104962260A and a preparation method and application thereof, and comprises clay substances, hotplate gum, xanthan gum, inorganic salt and high molecular polymer. At present, the research on the suspension stabilizer is mainly carried out aiming at improving the high temperature resistance of the pre-liquid, the temperature resistance of the developed suspension stabilizer breaks through more than 220 ℃, but in the experimental process, the vast majority of suspension stabilizer hydration time at least reaches more than 3h, the problems of extremely slow hydration and dispersion speed and long acting time are generally existed, and the processing efficiency of the pre-liquid is greatly reduced under the condition. Disclosure of Invention In view of the above, the present disclosure provides a suspension stabilizer for composite well cementation, which solves the problems of slow hydration and dispersion speed, long onset time and greatly reduced processing efficiency of a head fluid of the existing suspension stabilizer. In order to achieve the above object, according to a first aspect, the present disclosure provides a suspension stabilizer for composite well cementation, comprising: The bio-gelatin powder comprises bio-gelatin powder, water, a hydration promoter and a solvent, wherein the hydration promoter is used for promoting the affinity of the bio-gelatin powder to the water, the solvent is used as an initial swelling medium of the bio-gelatin powder in preference to the water, is used for promoting the bio-gelatin powder to be uniformly dispersed in a system, and simultaneously swells the bio-gelatin powder to a half-swelling state, so that a space is reserved for the subsequent swelling reaction of the bio-gelatin powder with the water. Preferably, the contents of the components in weight percent are as follows: 2-6% of biological rubber powder, 7-15% of hydration promoter, 16-25% of solvent and 55-70% of deionized water. Preferably, the biological gum powder is one or more of xanthan gum, hotwheel gum and diutan. Preferably, the composition and the content of the biological gum powder are that the xanthan gum is 10% -30%, the temperature wheel gum is 20% -30% and the diutan is 40% -60%. Preferably, the hydration promoter is one or more of fatty alcohol polyoxyethylene ether, coconut diethanol amine, alkylphenol polyoxyethylene ether and polyoxyethylene sorbitan monooleate. Preferably, the hydration promoter comprises the following components in percentage by weight: 30% -60% of fatty alcohol polyoxyethylene ether, 10% -20% of coconut diethanol amine, 20% -30% of alkylphenol polyoxyethylene ether and 10% -20% of polyoxyethylene sorbitan monooleate. Preferably, the solvent is one or more of DMF, ethanol, isopropanol and ethylene glycol monobutyl ether. Preferably, the composition and content of the solvent are, in mass percent: 10% -20% of DMF, 10% -20% of ethanol, 20% -30% of isopropanol and 50% -60% of ethylene glycol monobutyl ether. In a second aspect, the method for preparing the suspension stabilizer for composite well cementation according to any one of the first aspect, comprises the following steps: completely dispersing the biological rubber powder in a solvent to form a first solution; Completely dispersing the hydration promoter in water to form a second solution; and (3) uniformly stirring the first solution and the second solution, and stirring for 0.5-1.5h at the temperature of 40-60 ℃ to obtain the composite suspension stabilizer for well cementation. Preferably, the defoamer is added while dispersing the hydration accelerator in water. The invention has the following beneficial effects: The invention provides a low-viscosity cutting composite suspension stabilizer with quick-dissolving quick-acting characteristics, which can be rapidly hydrated and dispersed, and a formed base solution can effectively support weighted particles, so that each performance is not reduced, and meanwhile, the low-viscosity cutting composite suspension stabilizer has the greatest characteristics that the base solution can be completely hydrated and dispersed in water within 1-2 minutes to play a suspension role, the suspension stability of a front liquid system is improved, the formed front liquid has the characteristic of low viscosity and high cutting, drillin