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A kind of composite hollow microsphere and its preparation method and application

A technology of hollow microspheres and hollow spheres, which is applied in the field of petroleum exploration, can solve the problems of being unable to withstand high pressure or grinding construction environment, difficult to control the density of drilling fluid, and large consumption of materials, so as to achieve fewer process steps and reaction influencing factors, The effect of small density change and broad application prospects

Active Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, the hollow glass microspheres are broken during the dynamic circulation of the drilling fluid, which leads to problems such as difficulty in controlling the density of the drilling fluid, large material consumption, and high cost.
There are also technologies and applications for modifying inorganic microspheres in the prior art, but these modified inorganic microspheres are usually still unable to withstand the harsh construction environment such as high pressure or grinding under high temperature conditions in the well

Method used

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  • A kind of composite hollow microsphere and its preparation method and application
  • A kind of composite hollow microsphere and its preparation method and application
  • A kind of composite hollow microsphere and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Preparation method of composite hollow microspheres

[0076] Pretreatment of inorganic hollow spheres: Weigh 1.0kg of commercially available borosilicate glass hollow microspheres (density 0.45g / cm 3 , pressure resistance 40MPa, average particle size 80μm), add 3.5 liters of ethanol at 25 ° C, and stir for 1.5 hours under the condition of 150r / min. The ethanol was removed by filtration, and the cleaned hollow glass microspheres were placed in a vacuum drying oven at 80° C. for 4 hours for use.

[0077] Surface coupling treatment of inorganic hollow spheres: using absolute ethanol as a solvent, prepare 2kg of a 10wt% KH-550 silane coupling agent solution, adjust the pH of the solution to 4 with glacial acetic acid, and slowly add 0.4kg of the above-mentioned solution while stirring. After cleaning and drying the hollow glass microspheres, the stirring speed was 150r / min, and then the temperature was raised to 55°C for reaction for 2h. After the reaction is completed, fil...

Embodiment 2

[0092] Preparation method of composite hollow microspheres

[0093] Pretreatment of inorganic hollow spheres: Weigh 0.8kg of commercially available hollow borosilicate glass microspheres (density 0.40g / cm 3 , pressure resistance 28MPa, average particle size 89μm), add 3 liters of ethanol at 25°C, and stir for 1 hour under the condition of 150r / min. The ethanol was removed by filtration, and the cleaned hollow glass microspheres were placed in a vacuum drying oven at 80° C. to dry for 2 hours for use.

[0094] Surface coupling treatment of inorganic hollow spheres: use absolute ethanol as solvent, prepare 3kg of 10wt% KH-560 silane coupling agent solution, adjust the pH of the solution to 4 with glacial acetic acid, and slowly add 0.5kg of the above-mentioned solution while stirring The surface-cleaned hollow glass microspheres were stirred at a speed of 120 r / min, and then heated to 55° C. for reaction for 2.5 hours. After the reaction is completed, filter the filter cake, w...

Embodiment 3

[0104] Preparation method of composite hollow microspheres

[0105] Pretreatment of inorganic hollow spheres: Weigh 1.0kg of commercially available silica hollow microspheres (density 0.5g / cm 3 , pressure resistance 40MPa, average particle size 90μm), add 3.5 liters of ethanol at 25 ° C, and stir for 1.5 hours under the condition of 150r / min. The ethanol was removed by filtration, and the cleaned hollow glass microspheres were placed in a vacuum drying oven at 80° C. for 4 hours for use.

[0106] The preparation of organic prepolymer: in the jacketed reaction kettle equipped with agitator, thermometer and condenser, add 7.29kg of 37wt% formaldehyde solution, adjust the pH value to 8 with ammonia, add 4.23kg of benzoic melamine, stir to After all dissolved, slowly heat up, react at a constant temperature of 85° C. for 3 hours, cool to room temperature, add 1.8 kg of deionized water and stir evenly to obtain a benzo-substituted melamine formaldehyde prepolymer for use. The sol...

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Abstract

The invention discloses a composite hollow microsphere. The composite hollow microsphere comprises an inorganic hollow sphere and an organic polymer coupled, grafted and cross-linked on the surface of the inorganic hollow sphere; wherein, the organic polymer is Thermosetting resin. The use of the setting modifier can effectively solve the problems of poor toughness, easy breakage, low strength, and poor temperature and pressure resistance of the microsphere reducing agent in the prior art, reduce the density of the drilling fluid and meet the construction requirements under different conditions. The invention also provides a method for preparing the composite hollow microspheres, a drilling fluid reducing agent containing the composite hollow microspheres, applications and corresponding drilling fluids.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a composite hollow microsphere and a preparation method thereof, a drilling fluid reducing agent and application thereof, and a drilling fluid. Background technique [0002] With the continuous growth of my country's oil and gas resource consumption, some low-pressure and low-permeability oil reservoirs with fractures, dissolved cavities and open pores have been put into development. In the later period, the formation pressure of many high-yield oilfields also gradually decreased. For example, the formation pressure of the Yingchengzi Formation in the Songnan area of ​​Northeast China of Sinopec is 0.77-0.98g / cm 3 , the formation pressure of the Ordos Daniudi gas field is less than 0.98 g / cm 3 . Exploration and development of such reservoirs are difficult. If the density of drilling fluid is too high, it will lead to leakage of drilling fluid and contamination of oil and gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09C3/10C08G12/32C08K7/28C08K7/26C08K9/06
CPCC09K8/03C08G12/32C08K7/26C08K7/28C08K9/06C09C3/10
Inventor 王建宇石秉忠赵素丽陈铖李胜
Owner CHINA PETROLEUM & CHEM CORP
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