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Application of expandable particle, and interface cleaning agent

A technology of expanding particles and interfaces, which is applied in the field of expandable particles and interface cleaning agents, can solve the problems of oil-based mud displacement and scouring, poor mud cake permeability, surfactant viscosity increase, etc., to facilitate cement truck pumps Delivery, easy to mix evenly, and enhance the effect of scouring

Pending Publication Date: 2022-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The flushing fluid described in the above prior art mainly uses surfactant as the main component of flushing oil-based mud, and the composition is relatively complicated
This type of flushing fluid has a certain effect on the emulsification and scouring of the interface oil film, but it has poor permeability to thicker oil-based mud cakes, and the effect of surfactants on increasing viscosity and lifting shear is not obvious, so it cannot be used for oil-based mud adhered to the interface. Effective displacement and flushing
Affects the cementing quality of the interface to a great extent

Method used

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  • Application of expandable particle, and interface cleaning agent
  • Application of expandable particle, and interface cleaning agent
  • Application of expandable particle, and interface cleaning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A paraffin wax with a melting temperature of 55-60°C is crushed into a 30-100 mesh powder by cryogenic freezing.

[0082] The hollow high elastic foam sponge is a polyurethane foam sponge.

[0083] Heat and melt the paraffin wax powder, coat and mix the uncompressed hollow high-elastic foam sponge and the paraffin wax solution evenly, each accounting for 50% by mass; cool the uniformly mixed material to 55-70°C, and compress to make a compressed For flakes, cool to room temperature.

[0084] The compressed sheet is granulated with a cutting granulator to obtain the compressed expandable granules, and the size of the granulation is controlled to be less than 3mm in diameter and length, such as 0.5mm, 1mm, 2mm, 3mm, so that for mixing.

Embodiment 2

[0086] A polyurethane with a melting temperature of 65-70 DEG C is crushed into a powder of 100-200 meshes by cryogenic freezing.

[0087] The hollow high elastic foam sponge is a polyether foam sponge.

[0088] The polyurethane powder is heated and melted, and the uncompressed hollow high-elastic foam sponge and polyurethane hot melt are coated and mixed evenly. The hollow high-elastic foam sponge and polyurethane powder account for 80% and 20% by mass respectively; Cool to 65-80°C, compress to make a compressed sheet, and cool to room temperature.

[0089] The compressed sheet is granulated with a cutting granulator to obtain the compressed expandable granules, and the size of the granulation is controlled to be less than 3mm in diameter and length, such as 0.5mm, 1mm, 2mm, 3mm, so that for mixing.

Embodiment 3

[0091] The ethylene-vinyl acetate copolymer with a melting temperature of 65-70°C is crushed into 100-300 meshes by cryogenic freezing.

[0092] The hollow high elastic foam sponge is a rubber foam sponge.

[0093] The ethylene-vinyl acetate powder is heated and melted, and the uncompressed hollow high-elastic foam sponge and the ethylene-vinyl acetate hot melt solution are coated and mixed evenly. The hollow high-elastic foam sponge and the ethylene-vinyl acetate powder account for 20% and 80%; the uniformly mixed material is cooled to 65-80° C., compressed to make a compressed sheet, and cooled to room temperature.

[0094] The compressed sheet is granulated with a cutting granulator to obtain the compressed expandable granules, and the size of the granulation is controlled to be less than 3mm in diameter and length, such as 0.5mm, 1mm, 2mm, 3mm, so that for mixing.

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Abstract

The invention provides application of expandable particles in a well cementation flushing fluid, and an interface cleaning agent. The expandable particle is formed by compounding foam sponge and a polymer binder. When the expandable particle is added into the well cementation flushing fluid for use, the high-elasticity foam sponge is dissolved or melted and excited under a well along with temperature rise, the particle is expanded into original high-elasticity foam sponge, and the high-elasticity foam sponge plays a role in effectively replacing and scouring oil-based mud adhered to an interface by utilizing the volume and scraping effect of the high-elasticity foam.

Description

technical field [0001] The invention belongs to the technical field of well cementing, and in particular relates to the application of expandable particles and an interface cleaning agent. Background technique [0002] Borehole wall instability brings certain difficulties to operations such as drilling, geological logging, logging and cementing. Oil-based drilling fluid is often used to solve shale stability problems, and has achieved good drilling results. However, as far as the cementing construction is concerned, the oil-based drilling fluid will stay at the interface and form oil slurry and oil film, which will seriously affect the interface bonding strength of the cement sheath and reduce the sealing quality of the cement sheath. Before operation, flushing liquid with high-efficiency flushing effect should be injected to clean the oil slurry, oil film and mud cake adhering to the interface, improve the cementation environment of the annular space interface, and ensure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 刘学鹏杜晓雨周仕明
Owner CHINA PETROLEUM & CHEM CORP
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