ATRP functional modified proppant and preparation method thereof

A proppant and functional technology, applied in the field of hydraulic fracturing, can solve problems such as single performance, and achieve the effects of strong versatility, preventing embedding, and reducing the degree of dissolution

Active Publication Date: 2017-06-13
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of conventional fracturing proppant is relatively low, its performance is single. The ceramsite and raw sand only have a simple support effect,

Method used

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  • ATRP functional modified proppant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of ATRP functional modified proppant, the sand surface is prepared, and the specific steps are as follows:

[0047]1) Silane modification on the surface of sand particles: Weigh 5-20g of sand proppant and disperse it in acetone to make a suspension, add it into a three-necked flask equipped with magnets, slowly drop 2g of bromosilanes into it with a reagent needle under stirring conditions Initiator, the solution becomes turbid, stirred and heated in an oil bath at 90°C for 3h, condensed and refluxed for 10-14h, and cooled to room temperature.

[0048] The precipitate was washed with a mixture of ethanol and water at a volume ratio of 4:1. After filtration, it was washed and precipitated with tetrahydrofuran and hexane respectively. Vacuum drying at room temperature to obtain surface-modified sand grains.

[0049] 2) Connect the hydrophobic brush by ATRP method: Weigh 100-1000mg of surface-modified sand into a 250mL round bottom flask with a medic...

Embodiment 2

[0053] Preparation of ATRP hydrophobically modified ceramsite, the specific steps are as follows:

[0054] 1) Silane modification on the surface of ceramsite: Weigh 10-100g ceramsite proppant and disperse it in toluene to make a suspension, add it into a three-necked flask equipped with a magnet, and slowly drop 2g bromine-containing proppant into it with a reagent needle under stirring conditions Silane initiator, the solution becomes cloudy. Heated and stirred in an oil bath at 90°C for 3h, condensed and refluxed for 14h, and cooled to room temperature. The precipitate was washed with a mixture of ethanol and water at a volume ratio of 4:1. After filtration, wash with acetone and filter. Vacuum drying at room temperature to obtain ceramsite proppant modified with bromosilane initiator on the surface.

[0055] 2) ATRP method to connect hydrophobic polymer brushes: Weigh 100-1000mg of surface-modified ceramsite into a 250mL round bottom flask with a medicine spoon, put it i...

Embodiment 3

[0058] The specific steps for the preparation of ATRP temperature-sensitive modified proppant are as follows:

[0059] 1) Silane modification on the surface of the proppant: Weigh 100g of proppant and disperse it in ketone reagent to make a solution, add it into a three-neck flask equipped with magnets, and slowly drop 2g of bromosilanes into it with a reagent needle under the condition of stirring. solution, the solution becomes cloudy. Heated in an oil bath at 90°C, condensed and refluxed for 10-14h, and cooled to room temperature.

[0060] Acetone solution washing, precipitation. Vacuum drying at room temperature to obtain a proppant modified with a bromosilane initiator on the surface.

[0061] 2) ATRP method to connect temperature-sensitive polymer brush: Weigh 100-1000mg surface-modified ceramsite into a 250mL round bottom flask with a medicine spoon, put it into a magnet, weigh 20-40mg cuprous halide catalyst, and use a rubber stopper Seal it and vent it with nitroge...

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Abstract

The invention relates to an ATRP functional modified proppant and a preparation method thereof. The method comprises the steps: 1) selecting an initiator, and carrying out surface modification on a proppant; and 2) selecting a monomer with functional groups, through an atom transfer radical polymerization (ATRP) method, adopting a catalyst and a ligand, at a certain temperature and under suitable conditions, after a certain time, carrying out reaction grafting on the proppant surface with functional polymer chains, and making the proppant having the functional properties of hydrophobicity, temperature control property and pH sensitivity or reaction activity and the like. The method has flexible and operationable modification, can perform functional design, has high versatility, is suitable for quartz sand, ceramsite and other conventional proppants, and can be used for design and development of new functional proppants; and according to different needs of oil reservoirs, the oil and gas yield is effectively improved.

Description

technical field [0001] The invention relates to an ATRP functional modified proppant and a preparation method thereof, belonging to the technical field of hydraulic fracturing in the process of oil and natural gas exploitation. Background technique [0002] Hydraulic fracturing is an important technical method for oil and gas well stimulation. Whether it is conventional low-permeability or ultra-low-permeability oil and gas reservoirs, or shale and tight sandstone reservoirs in unconventional oil and gas reservoirs, hydraulic fracturing plays a key role in increasing production. , especially in unconventional reservoirs, without hydraulic fracturing, it is difficult to extract oil and gas underground. Hydraulic fracturing is the use of high-pressure pumps to pump fracturing fluid into the formation to form one or more fractures with a certain geometric size in the formation. The length of the fractures generally ranges from tens of meters to hundreds of meters, and the heigh...

Claims

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Application Information

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IPC IPC(8): C09K8/80
Inventor 牟绍艳温庆志张东晓
Owner PEKING UNIV
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