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Method for preparing pH response type intelligent propping agent

A proppant and responsive technology, which is applied in the field of preparation of pH-responsive smart proppants, can solve the problems of poor modification and refinement effects, and achieve good application potential, good fluidity, and strong versatility

Inactive Publication Date: 2019-05-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the existing technology, especially the defects such as poor modification and refinement effect existing in the surface functional response modification of proppant, the present invention provides a preparation method of responsive intelligent proppant, especially the intelligent proppant responsive to pH Preparation method of proppant

Method used

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  • Method for preparing pH response type intelligent propping agent
  • Method for preparing pH response type intelligent propping agent
  • Method for preparing pH response type intelligent propping agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for preparing a responsive intelligent proppant, using a molecular graft polymerization method, comprising the following steps:

[0057] (1) Sand particle surface initiator modification: Weigh 5g of 20-140 mesh sand proppant and disperse it in 100mL acetone to make a mixed solution, add it into a reagent bottle equipped with magnets, and slowly drop it in with a reagent needle under the condition of stirring 2g of chlorodimethylsilylbromopropyl bromide isobutyrate was stirred and heated in an oil bath at 90°C for 3h under the protection of nitrogen, condensed and refluxed for 10-20h, and cooled to room temperature. Washing and precipitating with tetrahydrofuran and acetone respectively; vacuum drying at room temperature to obtain a sand grain proppant with propyl chlorodimethylsilyl bromide isobutyrate on the surface.

[0058] (2) Grafting hydrophobic molecules: Weigh 100 mg of surface-modified sand into a 250 mL round-bottomed flask with a medicine spoon, put ...

Embodiment 2

[0061] A method for preparing a responsive intelligent proppant, using a molecular graft polymerization method, comprising the following steps:

[0062] (1) Ceramsite Surface Initiator Modification: Weigh 100g of 20-140 mesh ceramsite proppant and disperse it in 100mL of toluene to make a mixed solution, add it to the reagent bottle equipped with a magnet, and use a reagent needle to slowly 2g of dibromoisobutyryloxyethane was added dropwise, under the protection of nitrogen, stirred and heated in an oil bath at 50°C for 3h, condensed and refluxed for 20h, and cooled to room temperature. Washing and precipitating with tetrahydrofuran and acetone respectively; vacuum drying at room temperature to obtain the ceramsite proppant modified with dibromoisobutyryloxyethane on the surface.

[0063] (2) Molecular grafting method to connect hydrophobic brushes: Weigh 1000mg of surface-modified ceramsite into a 250mL round bottom flask with a medicine spoon, put it into a magnet, weigh 50...

Embodiment 3

[0066] A method for preparing a responsive intelligent proppant, using a molecular graft polymerization method, comprising the following steps:

[0067] (1) Sand particle surface initiator modification: Weigh 50g of 20-140 mesh sand proppant and disperse it in 150mL of acetone to make a mixed solution, add it into a reagent bottle equipped with magnets, slowly drop it in with a reagent needle under stirring conditions 2g of bromoisobutyryl bromide was stirred and heated in an oil bath at 150°C for 3h under the protection of nitrogen, condensed and refluxed for 15h, and cooled to room temperature. Washing and precipitating with tetrahydrofuran and acetone respectively; vacuum drying at room temperature to obtain a sand proppant modified with bromoisobutyryl bromide on the surface.

[0068] (2) Molecular grafting method to connect hydrophobic brushes: Weigh 500mg of surface-modified sand into a 250mL round-bottomed flask with a medicine spoon, put in a magnet, weigh 40mg of cupr...

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Abstract

The invention relates to a preparation method of a pH response type intelligent propping agent. A molecular grafting method is adopted. The method comprises propping agent surface initiation modification, grafting a response type functional polymer through a molecular grafting method, filtering and washing an obtained intermediate product, and treating under the condition of high temperature or acidification to obtain the response type intelligent propping agent. The pH response type intelligent propping agent can also be prepared by a resin coating method. According to the invention, the method starts from chemical molecule modification, and intelligent response of the propping agent is realized by grafting a functional polymer chain on the surface of the propping agent. The obtained intelligent modified propping agent has obvious pH response characteristics, and the contact angle of oil drops on the surface of the modified propping agent under the condition of low pH value is smallerthan the contact angle of oil drops on the surface of the modified propping agent under the condition of high pH value, so that the mobility of the oil drops on the surface of the modified propping agent under the condition of high pH value is better. The method is suitable for propping agents with different sizes and different types, and has good application potential.

Description

technical field [0001] The invention relates to a preparation method of a pH-responsive intelligent proppant, and belongs to the technical field of oil and gas field fracturing stimulation and chemically modified proppant. 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 height ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80
Inventor 牟绍艳温庆志张东晓
Owner PEKING UNIV
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