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Preparation method of propping agent coated with superhydrophobic polymeric membrane

A technology of polymer membranes and proppants, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problem of no contribution of proppant anti-fragmentation ability, change of wettability of solid surface, intermolecular Small force and other problems, to achieve the effect of facilitating hydrophobic oil conduction, improving surface hydrophobicity, and improving hydrophobicity

Active Publication Date: 2016-11-23
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resin layer improves the strength and corrosion resistance of the proppant, but oil and water can still pass through in large quantities in the middle and late stages of oil layer production with high water cut or high displacement pressure; the surfactant has both polar hydrophilic chains and hydrophobic chains. It has the ability to change the wettability of the solid surface, but the degree of hydrophobicity is not large, and the maximum contact angle is only 74°; organosilicon materials are widely used in architectural waterproof coatings, and the C-F bond in organic fluorine compounds has large bond energy. The intermolecular force is small and the surface energy is low. When used alone to make hydrophobic proppant, the contact angle of silicone material can only reach 130°, while that of fluorine-containing material can only reach 120°.
Also, neither surfactants, silanes, or fluorosilanes contribute to the proppant's resistance to fragmentation

Method used

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  • Preparation method of propping agent coated with superhydrophobic polymeric membrane
  • Preparation method of propping agent coated with superhydrophobic polymeric membrane
  • Preparation method of propping agent coated with superhydrophobic polymeric membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a proppant wrapped with a superhydrophobic polymer membrane, the steps are:

[0028] a. Mix 8 parts by mass of tetraethyl orthosilicate and 30 parts by mass of ethanol to obtain solution A, add quantitative ammonia water to the solution, adjust the pH value of the solution to about 12.1, and react at a temperature of 50 ° C for 2 hours, form nanoparticles. Afterwards, 0.1 parts by mass of perfluorodecylmethylsiloxane was added to solution A, and the reaction was continued for 2 hours to obtain solution B;

[0029] b. Mix solution B and 1.5 parts by mass of thermoplastic phenolic resin, heat up to 70°C, and stir for about 10 minutes to obtain a homogeneous mixture C;

[0030] c. Add 0.15 parts by mass of hexamethylenetetramine to mixture C. After mixing for about 10 minutes, mix with 300 parts by mass of proppant ceramsite and stir for 5 minutes. ~40 mesh) surface coated with a layer of super-hydrophobic polymer film, cured at 90°C for 3 hours, ...

Embodiment 2

[0032] A preparation method of a proppant wrapped with a superhydrophobic polymer membrane, the steps are:

[0033] a. Mix 8 parts by mass of tetraethyl orthosilicate and 40 parts by mass of ethanol to obtain solution A, add quantitative ammonia water to the solution, adjust the pH value of the solution to about 12.5, and react at 55°C for 2 hours , forming nanoparticles. After that, 1.3 parts by mass of perfluorodecyltriethoxysilane was added to solution A, and the reaction was continued for 0.5 hours to obtain solution B;

[0034] b. Mix solution B and 1.5 parts by mass of thermoplastic phenolic resin, heat up to 70°C, and stir for about 10 minutes to obtain a homogeneous mixture C;

[0035] c. Add 0.6 parts by mass of hexamethylenetetramine to the mixture C. After mixing for about 10 minutes, mix with 300 parts by mass of proppant ceramsite and stir for 5 minutes, wrap a piece of ceramsite (20 / 40 mesh) A layer of super-hydrophobic polymer film, placed at 120 ° C for 1 hou...

Embodiment 3

[0037] A preparation method of a proppant wrapped with a superhydrophobic polymer membrane, the steps are:

[0038] a. Mix 10 parts by mass of tetramethyl orthosilicate and 50 parts by mass of ethanol to obtain solution A, add quantitative ethylenediamine to the solution, adjust the pH value of the solution to about 12.3, and react at 60°C for 2 Hours, nanoparticles are formed. Afterwards, 0.1 parts by mass of perfluorodecyltriethoxysilane was added to solution A, and the reaction was continued for 1 hour to obtain solution B;

[0039] b. Mix solution B with 8 parts by mass of thermoplastic epoxy resin, heat up to 90°C, and stir for about 10 minutes to obtain a homogeneous mixture C;

[0040] c. Add 0.8 parts by mass of diethylenetriamine to mixture C, mix for about 10 minutes, mix with 600 parts by mass of proppant ceramsite and stir for 7 minutes, and wrap a layer on the surface of ceramsite (20 / 40 mesh) The super-hydrophobic polymer film is cured at 110°C for 2 hours, and t...

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Abstract

The invention discloses a preparation method of a propping agent coated with a superhydrophobic polymeric membrane. The preparation method is characterized by comprising the steps that an organosilicone precursor and alcohol are mixed, the pH value is regulated to be 12-13 through alkali liquor, reacting is conducted for 0.5-5 h at the temperature of 30 DEG C to 70 DEG C, and then fluorosilane is added for reacting; liquor obtained after reacting and linear resin are mixed, and the temperature of the mixed liquor is increased to 70 DEG C to 100 DEG C; a curing agent is added, after the mixed liquor and a propping agent are mixed to be cured for 1-3 h at the temperature of 90 DEG C to 120 DEG C, curing is conducted for 1-3 h by increasing the temperature to 150 DEG C to 200 DEG C, and then the propping agent coated with the superhydrophobic polymeric membrane is prepared. According to the preparation method, the contact angle between the surface of the prepared polymeric membrane and water is larger than 150 degrees, the hydrophobicity of the surface of the propping agent can be greatly improved, the propping agent modified with the polymeric membrane serves as a key material of a hydrofracture technique, the exploitation quality of shale oil and gas can be improved, the exploitation yield of the shale oil and gas can be increased, and the practicability is high.

Description

technical field [0001] The invention belongs to the preparation of fracturing materials for oil wells, and relates to a preparation method of a proppant wrapped with a superhydrophobic polymer film. The proppant wrapped with the super-hydrophobic polymer membrane prepared by the invention is particularly suitable as a hydraulic fracturing material for oil wells, and can improve the exploitation quality and output of shale oil and gas. Background technique [0002] Hydraulic fracturing uses surface high-pressure pumps to squeeze fracturing fluid with high viscosity into the oil layer through the wellbore, and the fracturing fluid carries the proppant into the fractures. After the proppant enters the fracture, it supports the fracture, prevents the fracture from closing, and provides a channel for oil and gas extraction, thereby increasing oil and gas production and improving the life of the oil well. The proppant is the key factor to realize the hydraulic fracture with a cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 任先艳刘才林杨海君刘雪荣徐雯婧张旭峰
Owner SOUTHWEAT UNIV OF SCI & TECH
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